v3.25.2
Derivative Financial Instruments (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Derivative Financial Instruments          
Notional Amount $ 30,760,230,000   $ 30,760,230,000   $ 28,513,557,000
Estimated Fair Value Gain 214,898,000   214,898,000   161,490,000
Estimated Fair Value Loss 612,284,000   612,284,000   879,855,000
Net gain (loss)     231,000    
Fair value of the interest rate swap derivatives, other assets 211,000,000   211,000,000   160,300,000
Reduction in derivative asset fair value     401,500,000   719,400,000
Fair value of the interest rate swap derivatives, other liabilities 611,300,000   611,300,000   878,000,000
Estimated gain (loss) on fair value     2,300,000   1,800,000
Mortgage loan pipeline          
Obligation under forward commitments, the fair value of those obligations along with the fair value of derivative instruments associated with forward commitments          
Obligation 76,157,000   76,157,000   59,291,000
Expected closures          
Obligation under forward commitments, the fair value of those obligations along with the fair value of derivative instruments associated with forward commitments          
Obligation 65,146,000   65,146,000   53,177,000
Cash flow hedge | Borrower          
Derivative Financial Instruments          
Collateral provided 242,800,000   242,800,000    
Cash flow hedge | Counterparty          
Derivative Financial Instruments          
Collateral provided 78,600,000   78,600,000    
Cash flow hedge | Interest-bearing deposits | Counterparty          
Derivative Financial Instruments          
Cash collateral 33,900,000   33,900,000    
Economic hedges | Counterparty          
Derivative Financial Instruments          
Estimated Fair Value Loss   $ 1,000,000   $ 1,000,000  
Interest rate contracts          
Derivative Financial Instruments          
Notional Amount 26,800,000,000   26,800,000,000   25,200,000,000
Mortgage servicing rights hedging | Non-designated hedges          
Derivative Financial Instruments          
Notional Amount 156,000,000   156,000,000   129,000,000
Estimated Fair Value Gain 2,304,000   2,304,000    
Estimated Fair Value Loss         1,809,000
Mortgage loan pipeline commitments hedging          
Obligation under forward commitments, the fair value of those obligations along with the fair value of derivative instruments associated with forward commitments          
Obligation 1,595,000   1,595,000   751,000
Mortgage loan pipeline commitments hedging | Non-designated hedges          
Derivative Financial Instruments          
Notional Amount 105,500,000   105,500,000   88,000,000
Estimated Fair Value Gain 1,595,000   1,595,000   1,083,000
Estimated Fair Value Loss 974,000   974,000    
Forward commitments          
Derivative Financial Instruments          
Estimated Fair Value Loss (974,000)   (974,000)   333,000
Obligation under forward commitments, the fair value of those obligations along with the fair value of derivative instruments associated with forward commitments          
Obligation 105,500,000   105,500,000   88,000,000
Foreign exchange swaps          
Derivative Financial Instruments          
Gain or loss recorded 0 0 0 0  
Interest rate swap          
Derivative Financial Instruments          
Net gain (loss) (59,000) $ 273,000 (231,000) $ 386,000  
Interest rate swap | Expected closures | Counterparty          
Derivative Financial Instruments          
Estimated Fair Value Loss 13,000,000   27,000,000    
Interest rate swap | Fair Value Hedging | Counterparty          
Derivative Financial Instruments          
Notional Amount 2,835,000   2,835,000   3,945,000
Estimated Fair Value Gain 57,000   57,000   107,000
Amortized cost basis of loans hedged 2,800,000   2,800,000   3,800,000
Interest rate swap | Non-designated hedges | Borrower          
Derivative Financial Instruments          
Notional Amount 13,503,351,000   13,503,351,000   12,649,905,000
Estimated Fair Value Gain 134,435,000   134,435,000   36,232,000
Estimated Fair Value Loss 611,310,000   611,310,000   878,046,000
Interest rate swap | Non-designated hedges | Counterparty          
Derivative Financial Instruments          
Notional Amount 13,314,544,000   13,314,544,000   12,559,707,000
Estimated Fair Value Gain 76,534,000   76,534,000   124,032,000
Total gross derivative instruments, before netting, Notional amount 1,883,134,000   1,883,134,000   1,858,693,000
Total gross derivative instruments, before netting, Estimated fair value gain     87,546,000   133,304,000
Total gross derivative instruments, before netting, Estimated fair value loss     4,272,000   708,000
Less: Netting adjustment, Notional amount 204,600,000   204,600,000   49,000,000
Less: Netting adjustment, Estimated fair value gain     (4,272,000)   (708,000)
Less: Netting adjustment, Estimated fair value loss     (4,272,000)   (708,000)
Total gross derivative instruments, after netting, Notional amount 1,883,134,000   1,883,134,000   1,858,693,000
Total gross derivative instruments, after netting, Estimated fair value gain     83,274,000   132,596,000
Master netting arrangement collateral obligation to return cash offset against derivative asset 33,900,000   33,900,000   53,900,000
Securities pledged 29,100,000   29,100,000   30,400,000
Master netting arrangement collateral obligation cash paid offset against derivative asset 1,700,000   1,700,000   1,900,000
Reduction in derivative asset fair value     401,500,000   719,400,000
Interest rate swap | Economic hedges | Counterparty          
Derivative Financial Instruments          
Notional Amount 3,678,000,000   3,678,000,000   3,083,000,000
Estimated Fair Value Loss $ 27,000   $ 27,000   $ (36,000)