v3.26.1
Allowance for Credit Losses - Schedule of Aging of the Company's Loan Portfolio (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Jun. 30, 2025
Financing Receivable, Past Due [Line Items]      
Nonaccrual $ 163,123 $ 166,651 $ 173,977
Total loans, net of unearned income 55,654,947 53,105,101 51,041,679
Early buy-out loans guaranteed by U.S. government agencies      
Financing Receivable, Past Due [Line Items]      
Nonaccrual 0 0 0
Total loans, net of unearned income 131,335 145,793 134,067
Commercial      
Financing Receivable, Past Due [Line Items]      
Nonaccrual 90,642 78,059 80,877
Total loans, net of unearned income 18,281,311 17,044,686 16,387,431
Commercial real estate      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 14,270,607 13,940,736 13,292,010
Commercial real estate | Construction and development      
Financing Receivable, Past Due [Line Items]      
Nonaccrual 859 2,976 3,200
Total loans, net of unearned income 2,655,665 2,409,582 2,529,117
Commercial real estate | Non-construction      
Financing Receivable, Past Due [Line Items]      
Nonaccrual 16,361 22,171 29,628
Total loans, net of unearned income 11,614,942 11,531,154 10,762,893
Home equity      
Financing Receivable, Past Due [Line Items]      
Nonaccrual 1,177 1,221 1,780
Total loans, net of unearned income 491,782 480,525 466,815
Residential real estate, excluding early buy-out loans      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 4,542,692 4,317,232 3,948,782
Residential real estate, excluding early buy-out loans | Residential real estate, excluding early buy-out loans      
Financing Receivable, Past Due [Line Items]      
Nonaccrual 25,910 32,862 28,047
Total loans, net of unearned income 4,411,357 4,171,439 3,814,715
Premium finance receivables—property & casualty | Premium finance receivables—property & casualty      
Financing Receivable, Past Due [Line Items]      
Nonaccrual 28,061 29,354 30,404
Total loans, net of unearned income 8,612,023 8,183,416 8,323,176
Premium finance receivables—property & casualty | Premium finance receivables—life insurance      
Financing Receivable, Past Due [Line Items]      
Nonaccrual 0 0 0
Total loans, net of unearned income 9,312,521 9,023,642 8,506,960
Consumer and other      
Financing Receivable, Past Due [Line Items]      
Nonaccrual 113 8 41
Total loans, net of unearned income 144,011 114,864 116,505
Total loans, net of unearned income, excluding early buy-out loans      
Financing Receivable, Past Due [Line Items]      
Nonaccrual 163,123 166,651 173,977
Total loans, net of unearned income 55,523,612 52,959,308 50,907,612
90+ days and still accruing      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 70,043 73,005 65,500
90+ days and still accruing | Early buy-out loans guaranteed by U.S. government agencies      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 53,895 53,848 50,639
90+ days and still accruing | Commercial      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 0 0 0
90+ days and still accruing | Commercial real estate | Construction and development      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 0 0 0
90+ days and still accruing | Commercial real estate | Non-construction      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 0 0 0
90+ days and still accruing | Home equity      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 0 0 0
90+ days and still accruing | Residential real estate, excluding early buy-out loans | Residential real estate, excluding early buy-out loans      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 0 0 0
90+ days and still accruing | Premium finance receivables—property & casualty | Premium finance receivables—property & casualty      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 16,003 19,115 14,350
90+ days and still accruing | Premium finance receivables—property & casualty | Premium finance receivables—life insurance      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 0 0 327
90+ days and still accruing | Consumer and other      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 145 42 184
90+ days and still accruing | Total loans, net of unearned income, excluding early buy-out loans      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 16,148 19,157 14,861
60-89 days past due      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 55,341 95,006 92,108
60-89 days past due | Early buy-out loans guaranteed by U.S. government agencies      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 310 204 0
60-89 days past due | Commercial      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 14,851 22,952 34,855
60-89 days past due | Commercial real estate | Construction and development      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 5,179 1,260 3,271
60-89 days past due | Commercial real estate | Non-construction      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 9,700 18,269 7,986
60-89 days past due | Home equity      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 690 1,112 138
60-89 days past due | Residential real estate, excluding early buy-out loans | Residential real estate, excluding early buy-out loans      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 3,310 7,562 8,954
60-89 days past due | Premium finance receivables—property & casualty | Premium finance receivables—property & casualty      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 18,198 29,294 25,641
60-89 days past due | Premium finance receivables—property & casualty | Premium finance receivables—life insurance      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 2,908 13,887 11,202
60-89 days past due | Consumer and other      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 195 466 61
60-89 days past due | Total loans, net of unearned income, excluding early buy-out loans      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 55,031 94,802 92,108
30-59 days past due      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 135,344 265,982 163,323
30-59 days past due | Early buy-out loans guaranteed by U.S. government agencies      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 0 1,316 0
30-59 days past due | Commercial      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 38,292 90,205 45,103
30-59 days past due | Commercial real estate | Construction and development      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 1,055 13,456 1,721
30-59 days past due | Commercial real estate | Non-construction      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 59,396 52,145 49,452
30-59 days past due | Home equity      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 878 2,818 2,971
30-59 days past due | Residential real estate, excluding early buy-out loans | Residential real estate, excluding early buy-out loans      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 0 24,908 38
30-59 days past due | Premium finance receivables—property & casualty | Premium finance receivables—property & casualty      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 25,864 57,685 29,460
30-59 days past due | Premium finance receivables—property & casualty | Premium finance receivables—life insurance      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 8,606 22,806 34,403
30-59 days past due | Consumer and other      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 1,253 643 175
30-59 days past due | Total loans, net of unearned income, excluding early buy-out loans      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 135,344 264,666 163,323
Current      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 55,231,096 52,504,457 50,546,771
Current | Early buy-out loans guaranteed by U.S. government agencies      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 77,130 90,425 83,428
Current | Commercial      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 18,137,526 16,853,470 16,226,596
Current | Commercial real estate | Construction and development      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 2,648,572 2,391,890 2,520,925
Current | Commercial real estate | Non-construction      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 11,529,485 11,438,569 10,675,827
Current | Home equity      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 489,037 475,374 461,926
Current | Residential real estate, excluding early buy-out loans | Residential real estate, excluding early buy-out loans      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 4,382,137 4,106,107 3,777,676
Current | Premium finance receivables—property & casualty | Premium finance receivables—property & casualty      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 8,523,897 8,047,968 8,223,321
Current | Premium finance receivables—property & casualty | Premium finance receivables—life insurance      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 9,301,007 8,986,949 8,461,028
Current | Consumer and other      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income 142,305 113,705 116,044
Current | Total loans, net of unearned income, excluding early buy-out loans      
Financing Receivable, Past Due [Line Items]      
Total loans, net of unearned income $ 55,153,966 $ 52,414,032 $ 50,463,343