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Derivative Financial Instruments - Additional Information (Details) - Derivatives not Designated as Hedging Instruments [Member]
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
Contract
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Contract
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Contract
Beneficiary [Member]          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Number of risk participation agreements | Contract 6   6   3
Aggregate notional amount of credit risk participation agreements $ 51,200,000   $ 51,200,000   $ 41,100,000
Guarantor [Member]          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Number of risk participation agreements | Contract 24   24   24
Aggregate notional amount of credit risk participation agreements $ 173,800,000   $ 173,800,000   $ 172,000,000.0
Forward Contracts [Member]          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Off-balance sheet obligations 298,000,000.0   298,000,000.0   377,500,000
Valuation adjustment     839,000   (3,100,000)
Interest Rate Lock Commitments [Member]          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Off-balance sheet obligations 201,500,000   201,500,000   329,300,000
Valuation adjustment     2,500,000   9,600,000
Interest Rate Swap [Member]          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Total notional amount 1,216,000,000   1,216,000,000   1,125,000,000
Termination value of derivatives 846,000   846,000   1,300,000
Collateral Posted 1,100,000   1,100,000    
Mortgage Servicing Rights Hedge [Member]          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Total notional amount 320,500,000   320,500,000   $ 326,500,000
Net (negative) positive ineffectiveness on MSR fair value $ 144,000 $ 815,000 $ 1,700,000 $ 8,700,000