Regulatory Matters - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2023	Jul. 31, 2013
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Capital to Risk Weighted Assets	0.1085	0.1058
Total Capital to Risk Weighted Assets	0.1419	0.1390
Amount available for dividend distribution without prior approval from Regulatory Agency	$ 91.3
Percentage of Bank's capital and surplus of which extensions of credit to a single affiliate are limited	10.00%
Percentage of Bank's capital and surplus of which extensions of credit to all affiliates are limited	20.00%
Basel III New Requirements [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier 1 capital minimum buffer percent			2.50%
Minimum [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Capital to Risk Weighted Assets	0.0850
Total Capital to Risk Weighted Assets	0.1050