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Derivative Financial Instruments (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Derivative Financial Instruments |  |  |
Notional Amount | $ 24,934,490,000 |  | $ 24,452,059,000
Estimated Fair Value Gain | $ 176,784,000 |  | $ 172,939,000
Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration] | Noninterest Income, Other |  | Noninterest Income, Other
Estimated Fair Value Loss | $ 954,788,000 |  | $ 804,486,000
Derivative, Loss, Statement of Income or Comprehensive Income [Extensible Enumeration] | Noninterest Income, Other |  | Noninterest Income, Other
Fair value of the interest rate swap derivatives, other assets | $ 174,000,000.0 |  | $ 169,000,000.0
Reduction in derivative asset fair value | 781,100,000 |  | 635,300,000
Fair value of the interest rate swap derivatives, other liabilities | 954,300,000,000 |  | 803,500,000,000
Estimated gain (loss) on fair value | 381,000,000 |  | 2,600,000
Obligation under forward commitments, the fair value of those obligations along with the fair value of derivative instruments associated with forward commitments |  |  |
Fair value of forward commitments | (954,788,000) |  | (804,486,000)
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 | 117,590,000 |  | 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 | 102,911,000 |  | 54,993,000
Cash flow hedge | Borrower |  |  |
Derivative Financial Instruments |  |  |
Collateral provided | 237,800,000 |  |
Cash flow hedge | Interest-bearing deposits | Counterparty |  |  |
Derivative Financial Instruments |  |  |
Cash collateral | 53,700,000 |  |
Interest rate contracts |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | 22,900,000,000 |  | 22,600,000,000
Mortgage servicing rights hedging | Non-designated hedges |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | 107,000,000.0 |  | 142,000,000.0
Mortgage servicing rights hedging | Non-designated hedges | Other Assets |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | 107,000,000 |  | 142,000,000
Estimated Fair Value Gain | $ 381,000 |  | $ 2,605,000
Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration] | Noninterest Income, Other |  | Noninterest Income, Other
Derivative, Loss, Statement of Income or Comprehensive Income [Extensible Enumeration] | Noninterest Income, Other |  | Noninterest Income, Other
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 | $ 2,030,000 |  | $ 1,154,000
Mortgage loan pipeline commitments hedging | Non-designated hedges | Other Assets and Other Liabilities |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | 123,000,000 |  | 77,500,000
Estimated Fair Value Gain | $ 2,030,000 |  | $ 1,154,000
Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration] | Noninterest Income, Other |  | Noninterest Income, Other
Estimated Fair Value Loss | $ 491,000 |  | $ 947,000
Derivative, Loss, Statement of Income or Comprehensive Income [Extensible Enumeration] | Noninterest Income, Other |  | Noninterest Income, Other
Forward commitments |  |  |
Obligation under forward commitments, the fair value of those obligations along with the fair value of derivative instruments associated with forward commitments |  |  |
Obligation | $ 123,000,000 |  | $ 77,500,000
Fair value of forward commitments | (491,000) |  | (947,000)
Customer swaps | Cash flow hedge |  |  |
Derivative Financial Instruments |  |  |
Collateral provided | 99,500,000 |  |
Foreign exchange swaps |  |  |
Derivative Financial Instruments |  |  |
Gain or loss recorded | 0 | $ 0 |
Interest rate swap |  |  |
Derivative Financial Instruments |  |  |
Gain or loss recorded | 113,000 | $ 96,000 |
Interest rate swap | Fair Value Hedging | Counterparty |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | 9,100,000 |  | 9,200,000
Amortized cost basis of loans hedged | 9,600,000 |  | 9,700,000
Interest rate swap | Fair Value Hedging | Other Assets | Counterparty |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | 9,099,000 |  | 9,188,000
Estimated Fair Value Gain | $ 373,000 |  | $ 220,000
Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent |  | Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent
Derivative, Loss, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent |  | Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent
Interest rate swap | Non-designated hedges | Other Assets and Other Liabilities | Borrower |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | $ 11,513,291,000 |  | $ 11,327,419,000
Estimated Fair Value Gain | $ 29,960,000 |  | $ 60,145,000
Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration] | Noninterest Income, Other |  | Noninterest Income, Other
Estimated Fair Value Loss | $ 954,297,000 |  | $ 803,539,000
Derivative, Loss, Statement of Income or Comprehensive Income [Extensible Enumeration] | Noninterest Income, Other |  | Noninterest Income, Other
Interest rate swap | Non-designated hedges | Other Assets | Counterparty |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | $ 11,422,100,000 |  | $ 11,235,952,000
Estimated Fair Value Gain | $ 144,041,000 |  | $ 108,820,000
Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration] | Noninterest Income, Other |  | Noninterest Income, Other
Derivative, Loss, Statement of Income or Comprehensive Income [Extensible Enumeration] | Noninterest Income, Other |  | Noninterest Income, Other
Reduction in derivative asset fair value | $ 781,100,000 |  |
Interest rate swap | Economic hedges | Counterparty |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | 1,800,000,000 |  |
Estimated Fair Value Loss | 1,000,000 |  | $ 5,000,000
Interest rate swap | Economic hedges | Other Assets | Counterparty |  |  |
Derivative Financial Instruments |  |  |
Notional Amount | $ 1,760,000,000 |  | $ 1,660,000,000
Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration] | Noninterest Income, Other |  | Noninterest Income, Other
Estimated Fair Value Loss | $ 1,000 |  | $ 5,000
Derivative, Loss, Statement of Income or Comprehensive Income [Extensible Enumeration] | Noninterest Income, Other |  | Noninterest Income, Other

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