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Derivative Financial Instruments (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Derivative Financial Instruments |  |  |  |  |
Notional Amount | $ 23,616,881,000 |  | $ 23,616,881,000 |  | $ 1,251,878,000
Estimated Fair Value Gain |  |  | $ 212,345,000 |  |
Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Noninterest Income, Other |  | Noninterest Income, Other
Estimated Fair Value Loss |  |  |  |  | $ 20,979,193,000
Derivative, Loss, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Noninterest Income, Other |  | Noninterest Income, Other
Net gain (loss) | 587,000 | $ (3,000) | $ 599,000 | $ 107,000 |
Fair value of the interest rate swap derivatives, other assets | 210,500,000 |  | 210,500,000 |  | $ 209,800,000
Reduction in derivative asset fair value |  |  | 1,000,000,000.0 |  | 824,300,000
Fair value of the interest rate swap derivatives, other liabilities | 1,300,000,000 |  | 1,300,000,000 |  | 1,000,000,000.0
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 | (1,251,878,000) |  | (1,251,878,000) |  | (1,034,143,000)
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 | 91,885,000 |  | 91,885,000 |  |
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 | 83,475,000 |  | 83,475,000 |  |
Cash flow hedge |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Collateral provided | 0 |  | 0 |  | 0
Cash flow hedge | Borrower |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Collateral provided | 226,600,000 |  | 226,600,000 |  |
Cash flow hedge | Counterparty |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Collateral provided | 100,100,000 |  | 100,100,000 |  |
Cash flow hedge | Interest-bearing deposits | Counterparty |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Cash collateral | 102,400,000 |  | 102,400,000 |  |
Interest rate contracts |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional Amount | 22,300,000,000 |  | 22,300,000,000 |  | 20,900,000,000
Mortgage servicing rights hedging | Non-designated hedges |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional Amount | 44,000,000.0 |  | 44,000,000.0 |  | 35,000,000.0
Estimated gain (loss) on fair value |  |  | 819,000 |  | (163,000)
Mortgage servicing rights hedging | Non-designated hedges | Other Liabilities |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional Amount | 44,000,000 |  | $ 44,000,000 |  | 819,000
Estimated Fair Value Loss |  |  |  |  | $ 35,000,000
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 | 621,000 |  | $ 621,000 |  |
Mortgage loan pipeline commitments hedging | Non-designated hedges | Other Assets |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional Amount | 89,500,000 |  | 89,500,000 |  |
Estimated Fair Value Gain |  |  | $ 1,236,000 |  |
Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Noninterest Income, Other |  | Noninterest Income, Other
Estimated Fair Value Loss |  |  |  |  | $ 51,000,000
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 | 89,500,000 |  | $ 89,500,000 |  |
Fair value of forward commitments | (615,000) |  | (615,000) |  |
Foreign exchange swaps |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Gain or loss recorded | 0 | $ 0 | 0 | $ 0 |
Interest rate swap | Expected closures |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Estimated Fair Value Gain |  |  | 2,000,000 |  |
Interest rate swap | Fair Value Hedging | Counterparty |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional Amount | 9,500,000 |  | 9,500,000 |  | $ 12,300,000
Interest rate swap | Fair Value Hedging | Other Assets | Counterparty |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional Amount | 9,480,000 |  | 9,480,000 |  |
Estimated Fair Value Gain |  |  | $ 600,000 |  |
Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Noninterest Income, Other |  | Noninterest Income, Other
Estimated Fair Value Loss |  |  |  |  | $ 12,289,000
Interest rate swap | Non-designated hedges | Other Assets and Other Liabilities | Borrower |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional Amount | 11,182,309,000 |  | $ 11,182,309,000 |  | $ 1,251,059,000
Estimated Fair Value Gain |  |  | $ 5,078,000 |  |
Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Noninterest Income, Other |  | Noninterest Income, Other
Estimated Fair Value Loss |  |  |  |  | $ 10,480,171,000
Derivative, Loss, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Noninterest Income, Other |  | Noninterest Income, Other
Interest rate swap | Non-designated hedges | Other Assets and Other Liabilities | Counterparty |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional Amount | 11,091,592,000 |  | $ 11,091,592,000 |  |
Estimated Fair Value Gain |  |  | $ 205,429,000 |  |
Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Noninterest Income, Other |  | Noninterest Income, Other
Estimated Fair Value Loss |  |  |  |  | $ 10,400,733,000
Interest rate swap | Non-designated hedges | Other Assets | Counterparty |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Reduction in derivative asset fair value |  |  | $ 1,000,000,000.0 |  |
Interest rate swap | Economic hedges |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional Amount | 1,200,000,000 |  | 1,200,000,000 |  |
Interest rate swap | Economic hedges | Other Assets | Counterparty |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional Amount | $ 1,200,000,000 |  | 1,200,000,000 |  |
Estimated Fair Value Gain |  |  | $ 2,000 |  |

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