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Derivative Financial Instruments - Additional Information (Details) - Derivatives not Designated as Hedging Instruments [Member]
3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
Contract
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Contract
Beneficiary [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Number of risk participation agreements | Contract 5   3
Aggregate notional amount of credit risk participation agreements $ 49,300,000   $ 41,100,000
Guarantor [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Number of risk participation agreements | Contract 22   24
Aggregate notional amount of credit risk participation agreements $ 172,000,000.0   $ 172,000,000.0
Forward Contracts [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Off-balance sheet obligations 353,500,000   377,500,000
Valuation adjustment 6,500,000   (3,100,000)
Interest Rate Lock Commitments [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Off-balance sheet obligations 255,600,000   329,300,000
Valuation adjustment 4,100,000   9,600,000
Interest Rate Swap [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Total notional amount 1,172,000,000   1,125,000,000
Termination value of derivatives 980,000   1,300,000
Collateral Posted 1,300,000    
Mortgage Servicing Rights Hedge [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Total notional amount 379,000,000.0   $ 326,500,000
Net (negative) positive ineffectiveness on MSR fair value $ 270,000 $ 9,900,000