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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 |

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