v3.26.1
Loans and Allowance for Credit Losses on Loans - Age Analysis (Details) - USD ($)
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total $ 24,947,226,000   $ 24,040,202,000
Non-accrual 123,981,000    
Non-accrual With No Allowance 26,526,000    
Non-accrual loans earning interest income on cash basis 450,000   470,000
Interest income on non-accrual loans 106,000 $ 630,000  
Interest Income Reversed 5,100,000 $ 919,000  
Commercial      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 13,006,203,000   12,163,545,000
Non-accrual 85,415,000    
Non-accrual With No Allowance 6,499,000    
Mortgage finance      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 6,383,381,000   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 5,128,375,000   5,378,712,000
Non-accrual 38,566,000    
Non-accrual With No Allowance 20,027,000    
Consumer      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 429,267,000   $ 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 23,829,000    
30-59 Days Past Due | Commercial      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 16,559,000    
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 5,184,000    
30-59 Days Past Due | Consumer      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 2,086,000    
60-89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 8,750,000    
60-89 Days Past Due | Commercial      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 7,434,000    
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 1,094,000    
60-89 Days Past Due | Consumer      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 222,000    
90 Days or More Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 451,000    
90 Days or More Past Due | Commercial      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 451,000    
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 33,030,000    
Total Past Due | Commercial      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 24,444,000    
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 6,278,000    
Total Past Due | Consumer      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 2,308,000    
Current      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 24,790,215,000    
Current | Commercial      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 12,896,344,000    
Current | Mortgage finance      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 6,383,381,000    
Current | Commercial real estate      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total 5,083,531,000    
Current | Consumer      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total $ 426,959,000