Derivative Instruments and Hedging Activities - Additional Information (Details)			12 Months Ended
	Jul. 28, 2020 USD ($) Derivative	Jun. 24, 2016	Dec. 31, 2020 USD ($) Loan Derivative	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Derivative Instruments and Hedging Activities [Abstract]
Frequency of repricing			3 months
Interest expense			$ 186,000	$ 199,000	$ 199,000
Interest Rate Swap [Member]
Derivative Instruments and Hedging Activities [Abstract]
Expiration date			Sep. 15, 2020
Cash collateral			$ 1,100,000	$ 730,000
Interest Rate Swaps - Junior Subordinated Debt Due 2036 [Member]
Derivative Instruments and Hedging Activities [Abstract]
Fixed interest rate			3.21%	3.21%	3.21%
Interest expense			$ 87,000	$ 31,000	$ 43,000
Interest Rate Swaps - Junior Subordinated Debt Due 2036 [Member] | Cash Flow Hedging [Member]
Derivative Instruments and Hedging Activities [Abstract]
Ineffectiveness on hedges			$ 0	0	0
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		2031
Interest Rate Swaps - Junior Subordinated Debt Due 2036 [Member] | Minimum [Member]
Derivative Instruments and Hedging Activities [Abstract]
Period to convert floating rate liability to fixed rate liability under agreement		2020
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			$ 54,000
Notional/contract amount	$ 1,200,000
Termination fee	$ 89,200
Number of swap agreements terminated | Derivative	1
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