Regulatory Capital Requirements - Schedule of Bank Actual and Required Capital Amounts and Ratios (Detail) $ in Thousands	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Total capital
Actual	$ 251,042	$ 125,632
For capital adequacy purposes	188,807	77,953
To be well capitalized	236,009	97,441
Tier 1 capital
Actual	234,533	120,912
For capital adequacy purposes	141,605	58,465
To be well capitalized	188,807	77,953
Common equity
Actual	234,533	120,912
For capital adequacy purposes	106,204	43,848
To be well capitalized	153,406	63,337
Tier 1 capital
Actual	234,533	120,912
For capital adequacy purposes	66,526	44,248
To be well capitalized	$ 83,158	$ 55,311
Ratios
Actual	0.1062	0.1289
For capital adequacy purposes	0.08	0.08
To be well capitalized	0.10	0.10
Actual	0.0992	0.1241
For capital adequacy purposes	0.06	0.06
To be well capitalized	0.08	0.08
Actual	0.0992	0.1241
For capital adequacy purposes	0.045	0.045
To be well capitalized	0.065	0.065
Banking Regulation, Leverage Ratio [Abstract]
Actual	0.141	0.1093
For capital adequacy purposes	0.04	0.04
To be well capitalized	0.05	0.05