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Derivative Financial Instruments - Additional Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
Contract
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Contract
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Contract
Designated as Hedging Instrument [Member]          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Total excluded components of earnings recognition $ 132 $ 132 $ 393 $ 341  
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Total notional amount 1,515,000   1,515,000   $ 1,500,000
Interest and fees on LHFS and LHFI reclassified as a reduction over twelve months     2,700    
Designated as Hedging Instrument [Member] | Interest Rate Floor [Member]          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Total notional amount $ 1,515,000   $ 1,515,000   $ 1,500,000
Derivatives not Designated as Hedging Instruments [Member] | Beneficiary [Member]          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Number of risk participation agreements | Contract 10   10   11
Aggregate notional amount of credit risk participation agreements $ 111,100   $ 111,100   $ 83,900
Derivatives not Designated as Hedging Instruments [Member] | Guarantor [Member]          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Number of risk participation agreements | Contract 28   28   28
Aggregate notional amount of credit risk participation agreements $ 283,300   $ 283,300   $ 229,100
Derivatives not Designated as Hedging Instruments [Member] | Mortgage Servicing Rights Hedge [Member]          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Total notional amount 337,500   337,500   311,500
Net (negative) positive ineffectiveness on MSR fair value (858) $ (2,500) (2,000) $ (8,100)  
Derivatives not Designated as Hedging Instruments [Member] | Interest Rate Swap [Member]          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Total notional amount 1,800,000   1,800,000   1,819,000
Termination value of derivatives 0   0   568
Collateral Posted 2,200   2,200   1,500
Derivatives not Designated as Hedging Instruments [Member] | Forward Contracts [Member]          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Off-balance sheet obligations 149,500   149,500   110,000
Valuation adjustment     (215)   679
Derivatives not Designated as Hedging Instruments [Member] | Interest Rate Lock Commitments [Member]          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Off-balance sheet obligations $ 92,000   92,000   52,100
Valuation adjustment     $ 1,300   $ 229