Regulatory Capital Requirements - Schedule of Bank Actual and Required Capital Amounts and Ratios (Detail) $ in Thousands	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Total capital
Actual	$ 125,632	$ 81,355
For capital adequacy purposes	77,953	56,578
To be well capitalized	97,441	70,722
Tier 1 capital
Actual	120,912	77,904
For capital adequacy purposes	58,465	42,433
To be well capitalized	77,953	56,578
Common equity
Actual	120,912	77,904
For capital adequacy purposes	43,848	31,825
To be well capitalized	63,337	45,969
Tier 1 capital
Actual	120,912	77,904
For capital adequacy purposes	44,248	35,230
To be well capitalized	$ 55,311	$ 44,038
Ratios
Actual	0.1289	0.1150
For capital adequacy purposes	0.0800	0.0800
To be well capitalized	0.1000	0.1000
Actual	0.1241	0.1102
For capital adequacy purposes	0.0600	0.0600
To be well capitalized	0.0800	0.0800
Actual	0.1241	0.1102
For capital adequacy purposes	0.0450	0.0450
To be well capitalized	0.0650	0.0650
Banking Regulation, Leverage Ratio [Abstract]
Actual	0.1093	0.0885
For capital adequacy purposes	0.0400	0.0400
To be well capitalized	0.0500	0.0500