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Investment Securities - Summary of Amortized Cost and Estimated Fair Value (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-Sale [Line Items]
Amortized cost	$ 217,793	$ 259,658
Gross Unrealized Gains	793	446
Gross Unrealized Losses	(8,658)	(12,933)
Fair value	209,928	247,171
Mortgage-backed securities - U.S. Government Sponsored Enterprises (GSEs) [Member]
Debt Securities, Available-for-Sale [Line Items]
Amortized cost	159,819	197,792
Gross Unrealized Gains	770	422
Gross Unrealized Losses	(5,323)	(7,669)
Fair value	155,266	190,545
U.S. government agency securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Amortized cost	11,260	11,260
Gross Unrealized Gains	0	17
Gross Unrealized Losses	(791)	(1,077)
Fair value	10,469	10,200
Obligations of state and political subdivisions [Member]
Debt Securities, Available-for-Sale [Line Items]
Amortized cost	42,444	43,895
Gross Unrealized Gains	15	1
Gross Unrealized Losses	(2,541)	(4,166)
Fair value	39,918	39,730
Small business association (SBA) securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Amortized cost	1,344	1,856
Gross Unrealized Gains	5	5
Gross Unrealized Losses	(3)	(4)
Fair value	1,346	1,857
US Treasury Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Amortized cost	2,926	4,855
Gross Unrealized Gains	3	1
Gross Unrealized Losses	0	(17)
Fair value	$ 2,929	$ 4,839

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