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Derivative Financial Instruments (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Derivative Financial Instruments    
Notional Amount $ 28,513,557,000 $ 24,452,059,000
Estimated Fair Value Gain 161,490,000 172,939,000
Estimated Fair Value Loss 879,855,000 804,486,000
Fair value of the interest rate swap derivatives, other assets 160,300,000 169,000,000
Reduction in derivative asset fair value 719,400,000  
Fair value of the interest rate swap derivatives, other liabilities 878,000,000 803,500,000
Reduction in derivative liability fair value   635,300,000
Estimated gain (loss) on fair value (1,800,000) 2,600,000
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 59,291,000 65,051,000
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 53,177,000 54,993,000
Cash flow hedge | Borrower    
Derivative Financial Instruments    
Collateral provided 272,300,000 251,500,000
Cash flow hedge | Interest-bearing deposits | Counterparty    
Derivative Financial Instruments    
Cash collateral 53,900,000 45,200,000
Interest rate contracts    
Derivative Financial Instruments    
Notional Amount 25,200,000,000 22,600,000,000
Mortgage servicing rights hedging | Non-designated hedges    
Derivative Financial Instruments    
Notional Amount 129,000,000 142,000,000
Estimated Fair Value Gain   2,605,000
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 751,000 1,154,000
Mortgage loan pipeline commitments hedging | Non-designated hedges    
Derivative Financial Instruments    
Notional Amount 88,000,000 77,500,000
Estimated Fair Value Gain 1,083,000 1,154,000
Estimated Fair Value Loss   947,000
Forward commitments    
Derivative Financial Instruments    
Estimated Fair Value Loss 333,000 947,000
Obligation under forward commitments, the fair value of those obligations along with the fair value of derivative instruments associated with forward commitments    
Obligation 88,000,000 77,500,000
Customer swaps | Cash flow hedge    
Derivative Financial Instruments    
Collateral provided 90,400,000 104,100,000
Interest rate swap    
Derivative Financial Instruments    
Gain or loss recorded 645,000 596,000
Interest rate swap | Fair Value Hedging | Counterparty    
Derivative Financial Instruments    
Notional Amount 3,945,000 9,188,000
Estimated Fair Value Gain 107,000 220,000
Amortized cost basis of loans hedged 3,800,000 9,700,000
Interest rate swap | Non-designated hedges | Borrower    
Derivative Financial Instruments    
Notional Amount 12,649,905,000 11,327,419,000
Estimated Fair Value Gain 36,232,000 60,145,000
Estimated Fair Value Loss 878,046,000 803,539,000
Interest rate swap | Non-designated hedges | Counterparty    
Derivative Financial Instruments    
Notional Amount 12,559,707,000 11,235,952,000
Estimated Fair Value Gain 124,032,000 108,820,000
Total gross derivative instruments, before netting, Notional amount 1,858,693,000 2,119,053,000
Total gross derivative instruments, before netting, Estimated fair value gain 133,304,000 111,630,000
Total gross derivative instruments, before netting, Estimated fair value loss 708,000 4,795,000
Less: Netting adjustment, Notional amount 49,000,000 182,681,000
Less: Netting adjustment, Estimated fair value gain (708,000) (4,795,000)
Less: Netting adjustment, Estimated fair value loss (708,000) (4,795,000)
Total gross derivative instruments, after netting, Notional amount 1,858,693,000 2,119,053,000
Total gross derivative instruments, after netting, Estimated fair value gain 132,596,000 106,835,000
Master netting arrangement collateral obligation to return cash offset against derivative asset 53,900,000 45,200,000
Securities pledged 30,400,000 47,800,000
Master netting arrangement collateral obligation cash paid offset against derivative asset 1,900,000 1,900,000
Reduction in derivative asset fair value 719,400,000 635,300,000
Interest rate swap | Economic hedges | Counterparty    
Derivative Financial Instruments    
Notional Amount 3,083,000,000 1,660,000,000
Estimated Fair Value Gain 36,000  
Estimated Fair Value Loss   5,000
Foreign exchange contract    
Derivative Financial Instruments    
Gain or loss recorded $ 0 $ 0