Regulatory Capital Requirements - Schedule of Bank Actual and Required Capital Amounts and Ratios (Detail) $ in Thousands	Jun. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)
Total capital
Actual	$ 307,222	$ 282,736
For capital adequacy purposes	197,757	195,914
To be well capitalized	247,196	244,892
Tier 1 capital
Actual	284,441	263,058
For capital adequacy purposes	148,318	146,935
To be well capitalized	197,757	195,914
Common equity
Actual	284,441	263,058
For capital adequacy purposes	111,238	110,201
To be well capitalized	160,678	159,180
Tier 1 capital
Actual	284,441	263,058
For capital adequacy purposes	110,056	110,867
To be well capitalized	$ 137,569	$ 138,584
Ratios
Actual	0.1243	0.1155
For capital adequacy purposes	0.08	0.08
To be well capitalized	0.10	0.10
Actual	0.1151	0.1074
For capital adequacy purposes	0.06	0.06
To be well capitalized	0.08	0.08
Actual	0.1151	0.1074
For capital adequacy purposes	0.045	0.045
To be well capitalized	0.065	0.065
Banking Regulation, Leverage Ratio [Abstract]
Actual	0.1034	0.0949
For capital adequacy purposes	0.04	0.04
To be well capitalized	0.05	0.05