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Derivative Financial Instruments and Hedging Activities - Information on Derivatives (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
derivative
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Derivatives, Fair Value [Line Items]      
Carrying Amounts of Hedged Assets $ 18,041   $ 17,917
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Loans 368   6
Interest and fees on loans 20,695 $ 18,887  
Fair value hedge | Interest income      
Derivatives, Fair Value [Line Items]      
(Decrease) increase in value of designated interest rate swaps due to LIBOR interest rate movements (357) 529  
Payment on interest rate swaps (12) (55)  
Increase (decrease) in value of hedged loans 362 (576)  
Decrease in value of yield maintenance agreement (4) (4)  
Net loss on derivatives recognized against interest income (11) $ (106)  
Fair value hedge | Designated as hedging instrument      
Derivatives, Fair Value [Line Items]      
Accrued interest on swaps $ 2   3
Fair value hedge | Designated as hedging instrument | Interest rate swap      
Derivatives, Fair Value [Line Items]      
Number of derivative instruments | derivative 5    
Fair value hedge | Designated as hedging instrument | Interest rate swap | Other assets      
Derivatives, Fair Value [Line Items]      
Interest rate contracts notional amount, asset derivatives $ 3,760   8,895
Fair value hedge | Designated as hedging instrument | Interest rate swap | Other liabilities      
Derivatives, Fair Value [Line Items]      
Interest rate contracts notional amount, liability derivatives 13,914   9,016
Fair value hedge | Designated as hedging instrument | Interest rate contract | Other assets      
Derivatives, Fair Value [Line Items]      
Interest rate contracts fair value, asset derivatives 60   161
Fair value hedge | Designated as hedging instrument | Interest rate contract | Other liabilities      
Derivatives, Fair Value [Line Items]      
Interest rate contracts fair value, liability derivatives $ 631   $ 375