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Derivative Financial Instruments - Additional Information (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
Contract
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Contract
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Contract
Apr. 04, 2013
USD ($)
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]            
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]            
Period for which cash flow hedges will be used to hedge quarterly interest payments     5 years      
Derivative inception date     Dec. 31, 2014      
Derivative maturity date     Dec. 31, 2019      
Description of variable rate basis for derivative     three-month LIBOR      
Ineffectiveness related to interest rate swap designated as a cash flow hedge       $ 0    
Accumulated net, after tax gain included in accumulated other comprehensive (loss)         $ 0  
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Junior Subordinated Debentures [Member]            
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]            
Total notional amount           $ 60,000,000.0
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Three-month LIBOR [Member]            
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]            
Swap fixed interest rate to be paid 1.66%   1.66%      
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 3   3   3  
Aggregate notional amount of credit risk participation agreements $ 41,400,000   $ 41,400,000   $ 37,600,000  
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 21   21   21  
Aggregate notional amount of credit risk participation agreements $ 145,600,000   $ 145,600,000   $ 79,300,000  
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 331,000,000.0   331,000,000.0   564,000,000.0  
Net (negative) positive ineffectiveness on MSR fair value 815,000 $ (3,700,000) 8,700,000 $ (8,500,000)    
Derivatives not Designated as Hedging Instruments [Member] | Interest Rate Swap [Member]            
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]            
Total notional amount 1,054,000,000.000   1,054,000,000.000   893,100,000  
Termination value of derivatives 1,500,000   1,500,000   1,000,000.0  
Collateral Posted 1,600,000   1,600,000      
Derivatives not Designated as Hedging Instruments [Member] | Forward Contracts [Member]            
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]            
Off-balance sheet obligations 462,000,000.0   462,000,000.0   209,000,000.0  
Valuation adjustment     (1,100,000)   (486,000)  
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 $ 393,400,000   393,400,000   92,100,000  
Valuation adjustment     $ 12,200,000   $ 1,400,000