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Derivative Financial Instruments and Hedging Activities - Information on Derivatives (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
derivative
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Fair value hedges:      
Interest rate contracts fair value, Liability derivatives $ 1,912 $ 1,178  
Carrying Amounts of Hedged Assets 15,745 17,900  
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Loans 1,753 944  
Interest and fees on loans 84,674 84,331 $ 79,527
Fair value hedge | Interest income      
Fair value hedges:      
(Decrease) increase in value of designated interest rate swaps due to LIBOR interest rate movements (734) (964) 452
Payment on interest rate swaps (360) (90) (149)
Increase (decrease) in value of hedged loans 809 938 (425)
Decrease in value of yield maintenance agreement (12) (13) (14)
Net loss on derivatives recognized against interest income (297) (129) $ (136)
Fair value hedge | Designated as hedging instrument      
Derivatives, Fair Value [Line Items]      
Derivatives, accrued interest, interest rate swaps $ 11 6  
Interest rate swap | Fair value hedge | Designated as hedging instrument      
Derivatives, Fair Value [Line Items]      
Number of derivative instruments | derivative 4    
Interest rate swap | Fair value hedge | Designated as hedging instrument | Other assets      
Fair value hedges:      
Interest rate contracts notional amounts, Asset derivatives $ 0 0  
Interest rate swap | Fair value hedge | Designated as hedging instrument | Other liabilities      
Fair value hedges:      
Interest rate contracts notional amount, Liability derivatives 13,991 16,956  
Interest rate contract | Fair value hedge | Designated as hedging instrument | Other assets      
Fair value hedges:      
Interest rate contracts fair value, Asset derivatives 0 0  
Interest rate contract | Fair value hedge | Designated as hedging instrument | Other liabilities      
Fair value hedges:      
Interest rate contracts fair value, Liability derivatives $ 1,912 $ 1,178