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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