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Derivative Financial Instruments - Summary of Fair Value of Derivative Financial Instruments (Details) - USD ($) | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Assets | $ 26,317,000 | $ 10,472,000
Liabilities | 3,876,000 | 6,014,000
Designated as Hedging Instrument | Cash flow hedges | Interest rate swaps, collars, and floors on loan pools |  |
Derivative [Line Items] |  |
Notional | 1,800,000,000 | 1,600,000,000
Assets | 18,627,000 | 10,472,000
Liabilities | 3,876,000 | 6,014,000
Designated as Hedging Instrument | Cash flow hedges | Interest rate swaps on borrowings |  |
Derivative [Line Items] |  |
Notional | 150,000,000 | 150,000,000
Assets | 0 | 0
Liabilities | 0 | 0
Designated as Hedging Instrument | Fair value hedges | Interest rate swaps on borrowings |  |
Derivative [Line Items] |  |
Notional | 1,100,000,000 | 900,000,000.0
Assets | 7,690,000 | 0
Liabilities | 0 | 0
Designated as Hedging Instrument | Fair value hedges | Interest rate swaps on investment securities |  |
Derivative [Line Items] |  |
Notional | 998,107,000 | 998,107,000
Assets | 0 | 0
Liabilities | 0 | 0
Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Assets | 137,269,000 | 155,830,000
Liabilities | 208,166,000 | 262,902,000
Not Designated as Hedging Instrument | Interest rate lock commitments |  |
Derivative [Line Items] |  |
Notional | 110,582,000 | 25,151,000
Assets | 483,000 | 291,000
Liabilities | 0 | 0
Not Designated as Hedging Instrument | Forward mortgage loan contracts |  |
Derivative [Line Items] |  |
Notional | 154,287,000 | 39,529,000
Assets | 0 | 0
Liabilities | 19,000 | 566,000
Not Designated as Hedging Instrument | Customer interest rate swaps |  |
Derivative [Line Items] |  |
Notional | 6,246,316,000 | 5,954,216,000
Assets | 60,609,000 | 33,182,000
Liabilities | 147,190,000 | 228,750,000
Not Designated as Hedging Instrument | Counterparty interest rate swaps |  |
Derivative [Line Items] |  |
Notional | 6,246,316,000 | 5,954,216,000
Assets | 76,075,000 | 121,969,000
Liabilities | 60,896,000 | 33,346,000
Not Designated as Hedging Instrument | Customer foreign currency contracts |  |
Derivative [Line Items] |  |
Notional | 7,221,000 | 12,455,000
Assets | 74,000 | 320,000
Liabilities | 24,000 | 59,000
Not Designated as Hedging Instrument | Counterparty foreign currency contracts |  |
Derivative [Line Items] |  |
Notional | 7,130,000 | 12,308,000
Assets | 28,000 | 68,000
Liabilities | $ 37,000 | $ 181,000

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