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Derivative Financial Instruments - Additional Information (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
Contract
Dec. 31, 2018
USD ($)
Contract
Dec. 31, 2017
USD ($)
Apr. 04, 2013
USD ($)
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 $ 0 $ 0  
Accumulated net, after tax gain included in accumulated other comprehensive loss $ 0 $ 469,000    
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%      
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    
Aggregate notional amount of credit risk participation agreements $ 37,600,000 $ 23,100,000    
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 10 7    
Aggregate notional amount of credit risk participation agreements $ 79,300,000 $ 39,000,000.0    
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 564,000,000.0 318,000,000.0    
Net (negative) positive ineffectiveness on MSR fair value (11,500,000) 2,400,000 $ 254,000  
Derivatives not Designated as Hedging Instruments [Member] | Interest Rate Swap [Member]        
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]        
Total notional amount 893,100,000 475,800,000    
Termination value of derivatives 1,000,000.0 75,000    
Collateral Posted 1,400,000      
Derivatives not Designated as Hedging Instruments [Member] | Forward Contracts [Member]        
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]        
Off-balance sheet obligations 209,000,000.0 132,000,000.0    
Valuation adjustment (486,000) (1,800,000)    
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 92,100,000 71,200,000    
Valuation adjustment $ 1,400,000 $ 1,200,000