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Derivative Financial Instruments (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Derivative Financial Instruments |  |  |  |  |
Notional Amount | $ 26,378,169,000 |  | $ 26,378,169,000 |  | $ 24,452,059,000
Derivatives assets | 195,722,000 |  | 195,722,000 |  | 172,939,000
Derivative liabilities | 606,194,000 |  | 606,194,000 |  | 804,486,000
Net gain (loss) |  |  | 235,000 |  |
Fair value of the interest rate swap derivatives, other assets | 193,900,000 |  | 193,900,000 |  | 169,000,000.0
Reduction in derivative asset fair value |  |  | 412,500,000 |  | 635,300,000
Fair value of the interest rate swap derivatives, other liabilities | 605,900,000 |  | 605,900,000 |  | 803,500,000
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 | (606,194,000) |  | (606,194,000) |  | (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 | 109,071,000 |  | 109,071,000 |  | 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 | 96,462,000 |  | 96,462,000 |  | 54,993,000
Cash flow hedge | Borrower |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Collateral provided | 263,400,000 |  | 263,400,000 |  |
Cash flow hedge | Counterparty |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Collateral provided | 98,100,000 |  | 98,100,000 |  |
Cash flow hedge | Interest-bearing deposits | Counterparty |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Cash collateral | 19,900,000 |  | 19,900,000 |  |
Economic hedges | Counterparty |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Loss on derivative |  |  |  |  | 5,000,000
Interest rate contracts |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional Amount | 24,300,000,000 |  | 24,300,000,000 |  | 22,600,000,000
Mortgage servicing rights hedging | Non-designated hedges |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional Amount | 146,000,000 |  | 146,000,000 |  | 142,000,000
Derivatives assets |  |  |  |  | 2,605,000
Derivative liabilities | 5,000 |  | 5,000 |  |
Estimated gain (loss) on fair value |  |  | 5,000 |  | 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 | (5,000) |  | (5,000) |  |
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 | 1,685,000 |  | 1,685,000 |  | 1,154,000
Mortgage loan pipeline commitments hedging | Non-designated hedges |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional Amount | 126,000,000 |  | 126,000,000 |  | 77,500,000
Derivatives assets | 1,685,000 |  | 1,685,000 |  | 1,154,000
Derivative liabilities | 271,000 |  | 271,000 |  | 947,000
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 | (271,000) |  | (271,000) |  | (947,000)
Forward commitments |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Derivative liabilities | (271,000) |  | (271,000) |  | (947,000)
Obligation under forward commitments, the fair value of those obligations along with the fair value of derivative instruments associated with forward commitments |  |  |  |  |
Obligation | 126,000,000 |  | 126,000,000 |  | 77,500,000
Fair value of forward commitments | 271,000 |  | 271,000 |  | 947,000
Foreign exchange swaps |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Gain or loss recorded | 0 | $ 0 | 0 | $ 0 |
Interest rate swap |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Net gain (loss) | (621,000) | $ 587,000 | (235,000) | $ 599,000 |
Interest rate swap | Expected closures | Counterparty |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Gain on derivative | 27,000,000 |  | 28,000,000 |  |
Interest rate swap | Fair Value Hedging | Counterparty |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional Amount | 4,200,000 |  | 4,200,000 |  | 9,188,000
Amortized cost basis of loans hedged | 4,000,000.0 |  | 4,000,000.0 |  | 9,700,000
Derivatives assets | 81,000 |  | 81,000 |  | 220,000
Interest rate swap | Non-designated hedges | Borrower |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional Amount | 12,184,085,000 |  | 12,184,085,000 |  | 11,327,419,000
Derivatives assets | 133,461,000 |  | 133,461,000 |  | 60,145,000
Derivative liabilities | 605,734,000 |  | 605,734,000 |  | 803,539,000
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 | (605,734,000) |  | (605,734,000) |  | (803,539,000)
Interest rate swap | Non-designated hedges | Counterparty |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional Amount | 12,093,484,000 |  | 12,093,484,000 |  | 11,235,952,000
Derivatives assets | 60,467,000 |  | 60,467,000 |  | 108,820,000
Derivative liabilities | 184,000 |  | 184,000 |  |
Reduction in derivative asset fair value |  |  | 412,500,000 |  |
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 | (184,000) |  | (184,000) |  |
Interest rate swap | Economic hedges | Counterparty |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional Amount | 1,824,400,000 |  | 1,824,400,000 |  | 1,660,000,000
Derivative liabilities | (28,000) |  | (28,000) |  | 5,000
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 | $ 28,000 |  | $ 28,000 |  | $ (5,000)

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