Regulatory Capital Requirements - Schedule of Bank Actual and Required Capital Amounts and Ratios (Details) $ in Thousands	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Total capital
Actual	$ 78,409	$ 36,484
For capital adequacy purposes	53,237	20,367
To be well capitalized	66,546	24,459
Tier 1 capital
Actual	75,020	33,666
For capital adequacy purposes	39,928	15,275
To be well capitalized	53,237	20,367
Common equity
Actual	75,020	33,666
For capital adequacy purposes	29,946	11,456
To be well capitalized	43,255	16,548
Tier 1 capital
Actual	75,020	33,666
For capital adequacy purposes	16,856	17,054
To be well capitalized	$ 21,071	$ 21,317
Ratios
Actual	11.78	14.33
For capital adequacy purposes	8.00	8.00
To be well capitalized	10.00	10.00
Actual	11.27	13.22
For capital adequacy purposes	6.00	6.00
To be well capitalized	8.00	8.00
Actual	11.27	13.22
For capital adequacy purposes	4.50	4.50
To be well capitalized	6.50	6.50
Banking Regulation, Leverage Ratio [Abstract]
Actual	17.80	7.90
For capital adequacy purposes	4.00	4.00
To be well capitalized	5.00	5.00