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Derivative Instruments and Hedging Activities - Additional Information (Details)
12 Months Ended
Jun. 24, 2016
Jul. 01, 2010
Dec. 31, 2019
USD ($)
Loan
Derivative
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Derivative Instruments and Hedging Activities [Abstract]          
Frequency of repricing     3 months    
Interest expense     $ 199,000 $ 199,000 $ 199,000
Interest Rate Swaps - Junior Subordinated Debt Due 2036 [Member]          
Derivative Instruments and Hedging Activities [Abstract]          
Period to convert floating rate liability to fixed rate liability under agreement 2031        
Fixed interest rate     3.21% 3.21% 3.21%
Interest Rate Swaps - Junior Subordinated Debt Due 2036 [Member] | LIBOR [Member]          
Derivative Instruments and Hedging Activities [Abstract]          
Term of variable rate     3 months    
Basis spread on variable rate     1.70%    
Interest Rate Swaps - Junior Subordinated Debt Due 2036 [Member] | Maximum [Member]          
Derivative Instruments and Hedging Activities [Abstract]          
Period to convert floating rate liability to fixed rate liability under agreement   2020      
Interest Rate Swap through 6-15-2031 [Member]          
Derivative Instruments and Hedging Activities [Abstract]          
Interest expense     $ 0 $ 0 $ 0
Interest Rate Swap through 9-15-2020 [Member]          
Derivative Instruments and Hedging Activities [Abstract]          
Interest expense     31,000 43,000 82,000
Interest Rate Swap [Member]          
Derivative Instruments and Hedging Activities [Abstract]          
Cash collateral     730,000 430,000  
Interest Rate Swap [Member] | Cash Flow Hedging [Member]          
Derivative Instruments and Hedging Activities [Abstract]          
Ineffectiveness on hedges     $ 0 0 0
Interest Rate Swaps - Commercial Loans [Member]          
Derivative Instruments and Hedging Activities [Abstract]          
Number of swap agreements | Derivative     2    
Number of commercial loans managed with swap agreements | Loan     2    
Interest income     $ 26,000 $ 5,000  
Interest expense         $ 47,000
Interest Rate Swaps - Commercial Loans [Member] | LIBOR [Member]          
Derivative Instruments and Hedging Activities [Abstract]          
Term of variable rate     1 month    
Interest Rate Swaps - Commercial Loans [Member] | Maximum [Member]          
Derivative Instruments and Hedging Activities [Abstract]          
Period to convert fixed rate assets to floating rate assets under agreement     2025    
Interest Rate Swaps - Commercial Loans [Member] | Minimum [Member]          
Derivative Instruments and Hedging Activities [Abstract]          
Period to convert fixed rate assets to floating rate assets under agreement     2022