Regulatory Matters (Details) $ in Thousands		Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2018	Dec. 31, 2015
Actual [Abstract]
Tier 1 (Leverage), Amount		$ 42,580	$ 46,565
Tier 1 (Leverage), Ratio		0.0889	0.0954
Common Equity Tier 1, Amount		$ 42,580	$ 46,565
Common Equity Tier 1, Ratio		0.1670	0.1895
Tier 1, Amount		$ 42,580	$ 46,565
Tier 1, Ratio		0.1670	0.1895
Total Capital, Amount		$ 45,769	$ 49,802
Total Capital, Ratio		0.1795	0.2020
Minimum Capital Requirements [Abstract]
Tier 1 (Leverage), Amount		$ 19,164	$ 19,530
Tier 1 (leverage), Ratio	[1]	0.0400	0.0400
Common Equity Tier 1, Amount		$ 11,477	$ 11,059
Common Equity Tier 1, Ratio	[1]	0.0450	0.0450
Tier 1, Amount		$ 15,302	$ 14,746
Tier 1, Ratio	[1]	0.0600	0.0600
Total Capital, Amount		$ 20,403	$ 19,661
Total Capital, Ratio	[1]	0.0800	0.0800
Minimum Required To Be Well Capitalized Under Prompt Corrective Action Provisions [Abstract]
Tier 1 (Leverage), Amount		$ 23,954	$ 24,413
Tier 1 (Leverage), Ratio		0.0500	0.0500
Common Equity Tier 1, Amount		$ 16,577	$ 15,975
Common Equity Tier 1, Ratio		0.0650	0.0650
Tier 1, Amount		$ 20,403	$ 19,661
Tier 1, Ratio		0.0800	0.0800
Total Capital, Amount		$ 25,504	$ 24,577
Total Capital, Ratio		0.1000	0.1000
Conservation Buffer Rule Starting January 2016 [Member]
Regulatory Matters [Abstract]
Capital conservation buffer percentage					0.625%
Conservation Buffer Rule Subsequent To 2016 [Member]
Regulatory Matters [Abstract]
Capital conservation buffer annual increase percentage					0.625%
Conservation Buffer Rule [Member]
Regulatory Matters [Abstract]
Capital conservation buffer percentage				2.50%

[1] Without conservation buffer.