v3.26.1
Loans and Allowance for Credit Losses on Loans - Age Analysis (Details) - USD ($)
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total $ 25,179,662,000   $ 24,040,202,000
Non-accrual 144,947,000    
Non-accrual With No Allowance 4,964,000    
Non-accrual loans earning interest income on cash basis 463,000   470,000
Interest income on non-accrual loans 0 $ 64,000  
Interest Income Reversed 4,800,000 $ 7,000  
Commercial      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 12,499,262,000   12,163,545,000
Non-accrual 99,010,000    
Non-accrual With No Allowance 3,430,000    
Mortgage finance      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 6,961,686,000   6,064,019,000
Non-accrual 0    
Non-accrual With No Allowance 0    
Commercial real estate      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 5,287,272,000   5,378,712,000
Non-accrual 45,937,000    
Non-accrual With No Allowance 1,534,000    
Consumer      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 431,442,000   $ 433,926,000
Non-accrual 0    
Non-accrual With No Allowance 0    
30-59 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 17,597,000    
30-59 Days Past Due | Commercial      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 15,907,000    
30-59 Days Past Due | Mortgage finance      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 0    
30-59 Days Past Due | Commercial real estate      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 63,000    
30-59 Days Past Due | Consumer      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 1,627,000    
60-89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 880,000    
60-89 Days Past Due | Commercial      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 332,000    
60-89 Days Past Due | Mortgage finance      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 0    
60-89 Days Past Due | Commercial real estate      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 548,000    
60-89 Days Past Due | Consumer      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 0    
90 Days or More Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 18,030,000    
90 Days or More Past Due | Commercial      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 18,030,000    
90 Days or More Past Due | Mortgage finance      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 0    
90 Days or More Past Due | Commercial real estate      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 0    
90 Days or More Past Due | Consumer      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 0    
Total Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 36,507,000    
Total Past Due | Commercial      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 34,269,000    
Total Past Due | Mortgage finance      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 0    
Total Past Due | Commercial real estate      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 611,000    
Total Past Due | Consumer      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 1,627,000    
Current      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 24,998,208,000    
Current | Commercial      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 12,365,983,000    
Current | Mortgage finance      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 6,961,686,000    
Current | Commercial real estate      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 5,240,724,000    
Current | Consumer      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total $ 429,815,000