Shareholders' Equity and Regulatory Matters - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended	12 Months Ended
	Jan. 31, 2013	Sep. 30, 2021	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2013	Sep. 30, 2019
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Reserve on deposit liabilities			$ 0
Long-term debt			$ 29,161,000	$ 29,104,000
Remaining maturity drops period		5 years
Percentage of proceeds from sale of securities imposed as reduction		20.00%	20.00%
Shares repurchased during period			184,478	90,017	55,982
10-year Subordinated Debt [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Fixed rate junior subordinated debt securities per security		$ 12,000,000.0	$ 11,800,000
Debt securities final maturity date		Sep. 03, 2031
Interest rate of private placement		3.50%
Subordinated notes variable interest rate percentage		2.83%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]		SOFR Plus [Member]
15-year Subordinated Debt [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Fixed rate junior subordinated debt securities per security		$ 8,000,000.0	8,000,000.0
Debt securities final maturity date		Sep. 03, 2036
Interest rate of private placement		4.00%
Subordinated notes variable interest rate percentage		2.92%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]		SOFR Plus [Member]
SOFR Plus [Member] | 10-year Subordinated Debt [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Subordinated notes variable interest rate percentage		2.83%
SOFR Plus [Member] | 15-year Subordinated Debt [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Subordinated notes variable interest rate percentage		2.92%
Junior Subordinated Debt [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Fixed rate junior subordinated debt securities per security							$ 1,000
Minimum investment required under private placement							50,000
Long-term debt			$ 9,600,000				$ 10,000,000
Debt securities final maturity date			Sep. 30, 2029
Debt instrument earliest redemption date			Sep. 30, 2024
Interest rate of private placement			5.25%
Remaining maturity drops period			5 years
Percentage of proceeds from sale of securities imposed as reduction			20.00%
Subordinated debt issued			$ 7,700,000
Series B [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Issued	$ 7,900,000
Dividends rate	5.30%
Sale	$ 7,900,000
Total issuance costs	$ 113,000
Voting rights			The preferred stock has no voting rights
Series C [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Issued						$ 2,800,000
Dividends rate						5.30%
Sale						$ 2,800,000
Total issuance costs						$ 23,000
Voting rights			The preferred stock has no voting rights