Regulatory Capital Requirements - Schedule of Bank Actual and Required Capital Amounts and Ratios (Detail) $ in Thousands	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Total capital
Actual	$ 81,355	$ 36,484
For capital adequacy purposes	56,578	20,367
To be well capitalized	70,722	24,459
Tier 1 capital
Actual	77,904	33,666
For capital adequacy purposes	42,433	15,275
To be well capitalized	56,578	20,367
Common equity
Actual	77,904	33,666
For capital adequacy purposes	31,825	11,456
To be well capitalized	45,969	16,548
Tier 1 capital
Actual	77,904	33,666
For capital adequacy purposes	35,230	17,054
To be well capitalized	$ 44,038	$ 21,317
Ratios
Actual	11.50	14.33
For capital adequacy purposes	8.00	8.00
To be well capitalized	10.00	10.00
Actual	11.02	13.22
For capital adequacy purposes	6.00	6.00
To be well capitalized	8.00	8.00
Actual	11.02	13.22
For capital adequacy purposes	4.50	4.50
To be well capitalized	6.50	6.50
Banking Regulation, Leverage Ratio [Abstract]
Actual	8.85	7.90
For capital adequacy purposes	4.00	4.00
To be well capitalized	5.00	5.00