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Derivative Financial Instruments (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Derivative Financial Instruments |  |  |  |  |
Notional Amount | $ 32,323,565,000 |  | $ 32,323,565,000 |  | $ 28,513,557,000
Estimated Fair Value Gain | 226,359,000 |  | 226,359,000 |  | 161,490,000
Estimated Fair Value Loss | 561,708,000 |  | 561,708,000 |  | 879,855,000
Fair value of the interest rate swap derivatives, other assets | 225,200,000 |  | 225,200,000 |  | 160,300,000
Reduction in derivative asset fair value |  |  | 336,500,000 |  | 719,400,000
Fair value of the interest rate swap derivatives, other liabilities | 560,400,000 |  | 560,400,000 |  | 878,000,000
Estimated gain (loss) on fair value |  |  | (1,200,000) |  | (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 | 78,402,000 |  | 78,402,000 |  | 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 | 69,715,000 |  | 69,715,000 |  | 53,177,000
Cash flow hedge | Borrower |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Collateral provided | 275,400,000 |  | 275,400,000 |  |
Cash flow hedge | Counterparty |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Collateral provided | 77,500,000 |  | 77,500,000 |  |
Cash flow hedge | Interest-bearing deposits | Counterparty |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Cash collateral | 27,900,000 |  | 27,900,000 |  |
Economic hedges | Counterparty |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Estimated Fair Value Gain |  | $ 27,000,000 |  | $ 28,000,000 |
Interest rate contracts |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional Amount | 28,000,000,000 |  | 28,000,000,000 |  | 25,200,000,000
Mortgage servicing rights hedging | Non-designated hedges |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional Amount | 174,000,000 |  | 174,000,000 |  | 129,000,000
Estimated Fair Value Loss | 1,203,000 |  | 1,203,000 |  | 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 | 1,217,000 |  | 1,217,000 |  | 751,000
Mortgage loan pipeline commitments hedging | Non-designated hedges |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional Amount | 105,000,000 |  | 105,000,000 |  | 88,000,000
Estimated Fair Value Gain | 1,217,000 |  | 1,217,000 |  | 1,083,000
Estimated Fair Value Loss | 145,000 |  | 145,000 |  |
Forward commitments |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Estimated Fair Value Loss | (145,000) |  | (145,000) |  | 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 | 105,000,000 |  | 105,000,000 |  | 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) | 81,000 | $ (621,000) | (150,000) | $ (235,000) |
Interest rate swap | Expected closures | Counterparty |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Estimated Fair Value Loss | 39,000,000 |  | 66,000,000 |  |
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 | 51,000 |  | 51,000 |  | 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 | 14,094,070,000 |  | 14,094,070,000 |  | 12,649,905,000
Estimated Fair Value Gain | 152,561,000 |  | 152,561,000 |  | 36,232,000
Estimated Fair Value Loss | 560,360,000 |  | 560,360,000 |  | 878,046,000
Interest rate swap | Non-designated hedges | Counterparty |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional Amount | 13,899,660,000 |  | 13,899,660,000 |  | 12,559,707,000
Estimated Fair Value Gain | 72,596,000 |  | 72,596,000 |  | 124,032,000
Total gross derivative instruments, before netting, Notional amount | 1,851,685,000 |  | 1,851,685,000 |  | 1,858,693,000
Total gross derivative instruments, before netting, Estimated fair value gain |  |  | 79,989,000 |  | 133,304,000
Total gross derivative instruments, before netting, Estimated fair value loss |  |  | 4,652,000 |  | 708,000
Less: Netting adjustment, Notional amount | 219,901,000 |  | 219,901,000 |  | 49,000,000
Less: Netting adjustment, Estimated fair value gain |  |  | (4,652,000) |  | (708,000)
Less: Netting adjustment, Estimated fair value loss |  |  | (4,652,000) |  | (708,000)
Total gross derivative instruments, after netting, Notional amount | 1,851,685,000 |  | 1,851,685,000 |  | 1,858,693,000
Total gross derivative instruments, after netting, Estimated fair value gain |  |  | 75,337,000 |  | 132,596,000
Master netting arrangement collateral obligation to return cash offset against derivative asset | 27,900,000 |  | 27,900,000 |  | 53,900,000
Securities pledged | 28,800,000 |  | 28,800,000 |  | 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 |  |  | 336,500,000 |  | 719,400,000
Interest rate swap | Economic hedges | Counterparty |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional Amount | 4,048,000,000 |  | 4,048,000,000 |  | 3,083,000,000
Estimated Fair Value Gain | $ (66,000) |  | $ (66,000) |  | $ 36,000

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