Regulatory Capital Requirements - Schedule of Bank Actual and Required Capital Amounts and Ratios (Detail) $ in Thousands	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Total capital
Actual	$ 300,631	$ 282,736
For capital adequacy purposes	190,666	195,914
To be well capitalized	238,333	244,892
Tier 1 capital
Actual	279,092	263,058
For capital adequacy purposes	143,000	146,935
To be well capitalized	190,666	195,914
Common equity
Actual	279,092	263,058
For capital adequacy purposes	107,250	110,201
To be well capitalized	154,916	159,180
Tier 1 capital
Actual	279,092	263,058
For capital adequacy purposes	111,433	110,867
To be well capitalized	$ 139,292	$ 138,584
Ratios
Actual	0.1261	0.1155
For capital adequacy purposes	0.08	0.08
To be well capitalized	0.10	0.10
Actual	0.1171	0.0949
For capital adequacy purposes	0.06	0.06
To be well capitalized	0.08	0.08
Actual	0.1171	0.1074
For capital adequacy purposes	0.045	0.045
To be well capitalized	0.065	0.065
Banking Regulation, Leverage Ratio [Abstract]
Actual	0.1002	0.1074
For capital adequacy purposes	0.04	0.04
To be well capitalized	0.05	0.05