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 ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items]
Amortized Cost	$ 120,372	$ 86,920
Gross Unrealized Gains	1,280	14
Gross Unrealized Losses	(6,162)	(8,121)
Allowance for Credit Losses	0
Fair Value	115,490	78,813
Held-to-Maturity, Amortized Cost	36,735	31,822
Gross Unrecognized Gain	0	0
Gross Unrecognized Losses	(2,499)	(1,742)
Held-to-maturity, Fair value	34,236	30,080
Allowance for Credit Losses	(512)
US Government Agency securities [Member]
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items]
Amortized Cost	12,711
Gross Unrealized Gains	279
Gross Unrealized Losses	(5)
Allowance for Credit Losses	0
Fair Value	12,985
US Government Treasury securities [Member]
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items]
Amortized Cost	4,925
Gross Unrealized Gains	17
Gross Unrealized Losses	0
Allowance for Credit Losses	0
Fair Value	4,942
Small Business Administration Loan Pools [Member]
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items]
Amortized Cost		858
Gross Unrealized Gains		0
Gross Unrealized Losses		(15)
Fair Value		843
Obligations of state and political subdivisions [Member]
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items]
Amortized Cost	49,640	44,189
Gross Unrealized Gains	420	14
Gross Unrealized Losses	(3,015)	(4,034)
Allowance for Credit Losses	0
Fair Value	47,045	40,169
Mortgage-backed securities in government-sponsored entities [Member]
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items]
Amortized Cost	50,795	41,873
Gross Unrealized Gains	515	0
Gross Unrealized Losses	(3,129)	(4,072)
Allowance for Credit Losses	0
Fair Value	48,181	37,801
Other securities [Member]
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items]
Amortized Cost	2,301
Gross Unrealized Gains	49
Gross Unrealized Losses	(13)
Allowance for Credit Losses	0
Fair Value	2,337
Corporate Debentures [Member]
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items]
Held-to-Maturity, Amortized Cost	15,000	14,993
Gross Unrecognized Gain	0	0
Gross Unrecognized Losses	(1,592)	(994)
Held-to-maturity, Fair value	13,408	13,999
Allowance for Credit Losses	(512)
Structured Mortgage-backed Securities [Member]
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items]
Held-to-Maturity, Amortized Cost	21,735	16,829
Gross Unrecognized Gain	0	0
Gross Unrecognized Losses	(907)	(748)
Held-to-maturity, Fair value	20,828	$ 16,081
Allowance for Credit Losses	$ 0