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Derivative Financial Instruments - Summary of Fair Value of Derivative Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Designated as Hedging Instrument    
Derivative [Line Items]    
Assets $ 18,860 $ 4,155
Liabilities 1,845 11,196
Designated as Hedging Instrument | Cash flow hedges | Interest rate swaps, collars, and floors on loan pools    
Derivative [Line Items]    
Notional 2,000,000 1,900,000
Assets 13,448 3,490
Liabilities 1,845 11,196
Designated as Hedging Instrument | Cash flow hedges | Interest rate swaps on borrowings    
Derivative [Line Items]    
Notional 50,000 150,000
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 1,100,000
Assets 5,412 665
Liabilities 0 0
Designated as Hedging Instrument | Fair value hedges | Interest rate swaps on investment securities    
Derivative [Line Items]    
Notional 927,407 927,407
Assets 0 0
Liabilities 0 0
Not Designated as Hedging Instrument    
Derivative [Line Items]    
Assets 162,939 142,323
Liabilities 275,654 233,117
Not Designated as Hedging Instrument | Interest rate lock commitments    
Derivative [Line Items]    
Notional 126,070 57,380
Assets 522 0
Liabilities 0 166
Not Designated as Hedging Instrument | Forward mortgage loan contracts    
Derivative [Line Items]    
Notional 202,529 88,808
Assets 0 807
Liabilities 82 0
Not Designated as Hedging Instrument | Customer interest rate swaps    
Derivative [Line Items]    
Notional 9,706,441 6,255,123
Assets 83,696 12,827
Liabilities 191,202 219,926
Not Designated as Hedging Instrument | Counterparty interest rate swaps    
Derivative [Line Items]    
Notional 9,706,441 6,255,123
Assets 78,452 128,469
Liabilities 84,168 12,902
Not Designated as Hedging Instrument | Customer foreign currency contracts    
Derivative [Line Items]    
Notional 7,919 10,265
Assets 230 28
Liabilities 33 121
Not Designated as Hedging Instrument | Counterparty foreign currency contracts    
Derivative [Line Items]    
Notional 7,688 10,093
Assets 39 192
Liabilities $ 169 $ 2