Investment Securities - Summary of Amortized Cost, Gross Unrealized Gains and Losses, Allowance for Credit Losses and Fair Value of Investment Securities Available for Sale (Detail) - USD ($)	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items]
Amortized Cost	$ 265,647,000	$ 153,102,000
Gross Unrealized Gains	1,597,000	167,000
Gross Unrealized Losses	(4,624,000)	(7,679,000)
Allowance for Credit Losses	0	0
Fair Value	262,620,000	145,590,000
Held-to-Maturity, Amortized Cost	25,876,000	31,967,000
Gross Unrecognized Gain	0	6,000
Gross Unrecognized Losses	(665,000)	(1,689,000)
Held-to-maturity, Fair value	25,211,000	30,284,000
Allowance for Credit Losses	(391,000)	(459,000)
US Government Agency securities [Member]
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items]
Amortized Cost	11,337,000	13,017,000
Gross Unrealized Gains	293,000	96,000
Gross Unrealized Losses	(1,000)	(40,000)
Allowance for Credit Losses	0	0
Fair Value	11,629,000	13,073,000
Obligations of state and political subdivisions [Member]
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items]
Amortized Cost	49,892,000	51,254,000
Gross Unrealized Gains	81,000	10,000
Gross Unrealized Losses	(2,459,000)	(4,063,000)
Allowance for Credit Losses	0	0
Fair Value	47,514,000	47,201,000
Mortgage-backed securities in government-sponsored entities [Member]
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items]
Amortized Cost	203,984,000	88,289,000
Gross Unrealized Gains	1,223,000	61,000
Gross Unrealized Losses	(2,158,000)	(3,567,000)
Allowance for Credit Losses	0	0
Fair Value	203,049,000	84,783,000
Other securities [Member]
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items]
Amortized Cost	434,000	542,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(6,000)	(9,000)
Allowance for Credit Losses	0	0
Fair Value	428,000	533,000
Corporate Debentures [Member]
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items]
Held-to-Maturity, Amortized Cost	12,250,000	15,250,000
Gross Unrecognized Gain	0	0
Gross Unrecognized Losses	(367,000)	(984,000)
Held-to-maturity, Fair value	11,883,000	14,266,000
Allowance for Credit Losses	(391,000)	(459,000)	$ (512,000)
Structured Mortgage-backed Securities [Member]
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items]
Held-to-Maturity, Amortized Cost	13,626,000	16,717,000
Gross Unrecognized Gain	0	6,000
Gross Unrecognized Losses	(298,000)	(705,000)
Held-to-maturity, Fair value	13,328,000	16,018,000
Allowance for Credit Losses	$ 0	$ 0