v3.26.1
Loans and Allowance for Credit Losses on Loans - Loans by Investment Grade (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year $ 859,074   $ 2,901,098
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 2,799,169   1,864,486
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 1,832,769   1,705,297
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 1,634,634   2,455,183
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 2,118,628   715,721
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 1,470,261   884,023
Revolving lines of credit 14,449,132   13,498,964
Revolving lines of credit converted to term loans 15,995   15,430
Total 25,179,662   24,040,202
Financing receivable, excluding accrued interest, year one, originated, current fiscal year, writeoff 0   11,233
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year, writeoff 2,760   704
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year, writeoff 0   4,234
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year, writeoff 914   8,958
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year, writeoff 7,164   28
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year, writeoff 0   2,011
Revolving lines of credit, writeoff 6,651   25,715
Revolving line of credit converted to term loans, writeoff 0   0
Financing receivable, excluding accrued interest, allowance for credit loss, writeoff 17,489 $ 10,697 52,883
Commercial      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 540,411   2,082,776
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 1,943,719   1,189,891
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 1,130,316   734,628
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 661,129   749,826
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 675,042   157,957
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 284,735   160,701
Revolving lines of credit 7,253,871   7,078,407
Revolving lines of credit converted to term loans 10,039   9,359
Total 12,499,262   12,163,545
Financing receivable, excluding accrued interest, allowance for credit loss, writeoff 17,489 10,197  
Commercial | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 540,210   2,038,311
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 1,898,487   1,164,863
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 1,093,995   671,070
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 605,811   670,995
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 634,839   107,970
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 220,996   143,631
Revolving lines of credit 7,193,115   6,977,639
Revolving lines of credit converted to term loans 9,331   9,359
Total 12,196,784   11,783,838
Commercial | Special mention      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 40   7,659
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 7,709   16,204
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 27,346   16,093
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 10,872   42,441
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 15,399   15,346
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 14,284   1,239
Revolving lines of credit 28,101   39,073
Revolving lines of credit converted to term loans 708   0
Total 104,459   138,055
Commercial | Substandard - accruing      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   25,513
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 25,083   8,824
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 8,756   44,506
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 11,892   0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 0   34,641
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 37,997   4,192
Revolving lines of credit 15,281   27,830
Revolving lines of credit converted to term loans 0   0
Total 99,009   145,506
Commercial | Non-accrual      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 161   11,293
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 12,440   0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 219   2,959
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 32,554   36,390
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 24,804   0
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 11,458   11,639
Revolving lines of credit 17,374   33,865
Revolving lines of credit converted to term loans 0   0
Total 99,010   96,146
Mortgage finance      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 0   0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 0   0
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 0   0
Revolving lines of credit 6,961,686   6,064,019
Revolving lines of credit converted to term loans 0   0
Total 6,961,686   6,064,019
Financing receivable, excluding accrued interest, allowance for credit loss, writeoff 0 0  
Mortgage finance | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 0   0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 0   0
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 0   0
Revolving lines of credit 6,961,686   6,064,019
Revolving lines of credit converted to term loans 0   0
Total 6,961,686   6,064,019
Mortgage finance | Special mention      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 0   0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 0   0
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 0   0
Revolving lines of credit 0   0
Revolving lines of credit converted to term loans 0   0
Total 0   0
Mortgage finance | Substandard - accruing      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 0   0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 0   0
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 0   0
Revolving lines of credit 0   0
Revolving lines of credit converted to term loans 0   0
Total 0   0
Mortgage finance | Non-accrual      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 0   0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 0   0
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 0   0
Revolving lines of credit 0   0
Revolving lines of credit converted to term loans 0   0
Total 0   0
Commercial real estate      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 309,009   781,815
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 822,075   636,744
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 666,808   942,488
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 946,527   1,654,592
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 1,398,280   484,840
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 1,002,126   609,882
Revolving lines of credit 136,491   262,280
Revolving lines of credit converted to term loans 5,956   6,071
Total 5,287,272   5,378,712
Financing receivable, excluding accrued interest, allowance for credit loss, writeoff 0 500  
Commercial real estate | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 309,009   781,062
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 821,246   565,727
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 595,484   941,760
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 875,749   1,543,106
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 1,267,974   423,708
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 934,525   608,352
Revolving lines of credit 129,491   254,480
Revolving lines of credit converted to term loans 5,956   5,305
Total 4,939,434   5,123,500
Commercial real estate | Special mention      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   743
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 818   45,137
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 45,444   728
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 70,778   90,752
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 70,125   61,132
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 67,499   1,530
Revolving lines of credit 7,000   7,800
Revolving lines of credit converted to term loans 0   766
Total 261,664   208,588
Commercial real estate | Substandard - accruing      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   10
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 11   25,880
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 348   0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 39,776   0
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 102   0
Revolving lines of credit 0   0
Revolving lines of credit converted to term loans 0   0
Total 40,237   25,890
Commercial real estate | Non-accrual      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 0   0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 25,532   0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 0   20,734
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 20,405   0
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 0   0
Revolving lines of credit 0   0
Revolving lines of credit converted to term loans 0   0
Total 45,937   20,734
Consumer      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 9,654   36,507
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 33,375   37,851
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 35,645   28,181
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 26,978   50,765
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 45,306   72,924
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 183,400   113,440
Revolving lines of credit 97,084   94,258
Revolving lines of credit converted to term loans 0   0
Total 431,442   433,926
Financing receivable, excluding accrued interest, allowance for credit loss, writeoff 0 $ 0  
Consumer | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 9,654   36,507
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 33,375   37,851
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 35,645   28,181
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 26,978   50,765
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 45,306   72,924
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 183,101   113,440
Revolving lines of credit 97,084   94,258
Revolving lines of credit converted to term loans 0   0
Total 431,143   433,926
Consumer | Special mention      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 0   0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 0   0
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 299   0
Revolving lines of credit 0   0
Revolving lines of credit converted to term loans 0   0
Total 299   0
Consumer | Substandard - accruing      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 0   0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 0   0
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 0   0
Revolving lines of credit 0   0
Revolving lines of credit converted to term loans 0   0
Total 0   0
Consumer | Non-accrual      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 0   0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 0   0
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 0   0
Revolving lines of credit 0   0
Revolving lines of credit converted to term loans 0   0
Total $ 0   $ 0