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Derivative Financial Instruments (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Derivative Financial Instruments      
Notional Amount $ 33,936,584,000   $ 32,426,542,000
Estimated Fair Value Gain 191,332,000   222,886,000
Estimated Fair Value Loss 562,406,000   554,748,000
Fair value of the interest rate swap derivatives, other assets 189,300,000   221,700,000
Fair value of the interest rate swap derivatives, other liabilities 560,300,000   554,400,000
Reduction in derivative asset fair value 373,200,000   333,700,000
Estimated gain (loss) on fair value 2,100,000   69,000
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 120,258,000   55,318,000
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 107,610,000   48,106,000
Cash flow hedge | Borrower      
Derivative Financial Instruments      
Collateral provided 295,800,000    
Cash flow hedge | Counterparty      
Derivative Financial Instruments      
Collateral provided 72,800,000    
Cash flow hedge | Interest-bearing deposits | Counterparty      
Derivative Financial Instruments      
Cash collateral 28,900,000    
Interest rate contracts      
Derivative Financial Instruments      
Notional Amount 30,900,000,000   29,600,000,000
Mortgage servicing rights hedging | Non-designated hedges      
Derivative Financial Instruments      
Notional Amount 271,000,000   192,000,000
Estimated Fair Value Gain     69,000
Estimated Fair Value Loss 2,142,000    
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 1,199,000   982,000
Mortgage loan pipeline commitments hedging | Non-designated hedges      
Derivative Financial Instruments      
Notional Amount 128,500,000   81,000,000
Estimated Fair Value Gain 1,977,000   982,000
Estimated Fair Value Loss     315,000
Forward commitments      
Derivative Financial Instruments      
Estimated Fair Value Loss (778,000)   315,000
Obligation under forward commitments, the fair value of those obligations along with the fair value of derivative instruments associated with forward commitments      
Obligation 128,500,000   81,000,000
Interest rate swap      
Derivative Financial Instruments      
Gain or loss recorded 1,100,000   (172,000)
Interest rate swap | Fair Value Hedging | Counterparty      
Derivative Financial Instruments      
Notional Amount 2,615,000   2,615,000
Estimated Fair Value Gain 53,000   44,000
Amortized cost basis of loans hedged 2,600,000   2,600,000
Interest rate swap | Non-designated hedges | Borrower      
Derivative Financial Instruments      
Notional Amount 15,530,662,000   14,912,622,000
Estimated Fair Value Gain 111,165,000   143,879,000
Estimated Fair Value Loss 560,264,000   554,433,000
Interest rate swap | Non-designated hedges | Counterparty      
Derivative Financial Instruments      
Notional Amount 15,340,807,000   14,719,305,000
Estimated Fair Value Gain 78,112,000   77,799,000
Total gross derivative instruments, before netting, Notional amount 1,791,216,000   1,844,842,000
Total gross derivative instruments, before netting, Estimated fair value gain 83,072,000   81,240,000
Total gross derivative instruments, before netting, Estimated fair value loss 2,704,000   3,781,000
Less: Netting adjustment, Notional amount 192,450,000   221,941,000
Less: Netting adjustment, Estimated fair value gain (2,704,000)   (3,781,000)
Less: Netting adjustment, Estimated fair value loss (2,704,000)   (3,781,000)
Total gross derivative instruments, after netting, Notional amount 1,791,216,000   1,844,842,000
Total gross derivative instruments, after netting, Estimated fair value gain 80,368,000   77,459,000
Master netting arrangement collateral obligation to return cash offset against derivative asset 28,900,000   25,900,000
Securities pledged 27,600,000   28,100,000
Master netting arrangement collateral obligation cash paid offset against derivative asset 1,700,000   1,700,000
Reduction in derivative asset fair value 373,200,000   333,700,000
Interest rate swap | Economic hedges | Counterparty      
Derivative Financial Instruments      
Notional Amount 2,663,000,000   2,519,000,000
Estimated Fair Value Gain 25,000   $ 113,000
Estimated Fair Value Gain 25,000    
Estimated Fair Value Loss   $ 14,000  
Foreign exchange contract      
Derivative Financial Instruments      
Gain or loss recorded $ 0 $ 0