Regulatory Capital Requirements - Schedule of Bank Actual and Required Capital Amounts and Ratios (Detail) $ in Thousands	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Total capital
Actual	$ 260,275	$ 251,042
For capital adequacy purposes	188,613	188,807
To be well capitalized	235,766	236,009
Tier 1 capital
Actual	241,537	234,533
For capital adequacy purposes	141,459	141,605
To be well capitalized	188,613	188,807
Common equity
Actual	241,537	234,533
For capital adequacy purposes	106,095	106,204
To be well capitalized	153,248	153,406
Tier 1 capital
Actual	241,537	234,533
For capital adequacy purposes	104,681	66,526
To be well capitalized	$ 130,851	$ 83,158
Ratios
Actual	0.1104	0.1062
For capital adequacy purposes	0.08	0.08
To be well capitalized	0.10	0.10
Actual	0.1024	0.0992
For capital adequacy purposes	0.06	0.06
To be well capitalized	0.08	0.08
Actual	0.1024	0.0992
For capital adequacy purposes	0.045	0.045
To be well capitalized	0.065	0.065
Banking Regulation, Leverage Ratio [Abstract]
Actual	0.0923	0.141
For capital adequacy purposes	0.04	0.04
To be well capitalized	0.05	0.05