Derivative Financial Instruments - Additional Information (Details) - Derivatives not Designated as Hedging Instruments [Member]	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021 USD ($) Contract	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) Contract	Jun. 30, 2020 USD ($)	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	$ 50,300,000		$ 50,300,000		$ 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	$ 174,200,000		$ 174,200,000		$ 172,000,000.0
Forward Contracts [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet obligations	317,500,000		317,500,000		377,500,000
Valuation adjustment			(587,000)		(3,100,000)
Interest Rate Lock Commitments [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet obligations	238,800,000		238,800,000		329,300,000
Valuation adjustment			3,900,000		9,600,000
Interest Rate Swap [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total notional amount	1,115,000,000		1,115,000,000		1,125,000,000
Termination value of derivatives	950,000		950,000		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	374,500,000		374,500,000		$ 326,500,000
Net (negative) positive ineffectiveness on MSR fair value	$ 1,300,000	$ (2,000,000.0)	$ 1,500,000	$ 7,900,000