Investment Securities - Summary of Fair Value of Available For Sale Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt Securities Available For Sale Unrealized Loss Position Fair Value [Line Items]
Less than 12 Months Fair Value	$ 20,096	$ 8,698
Less than 12 Months Unrealized Losses	(226)	(117)
More than 12 Months Fair Value	66,586	67,335
More than 12 Months Unrealized Losses	(10,810)	(10,099)
Fair Value	86,682	76,033
Unrealized Losses	(11,036)	(10,216)
Mortgage-backed securities - U.S. Government Sponsored Enterprises (GSEs) [Member]
Debt Securities Available For Sale Unrealized Loss Position Fair Value [Line Items]
Less than 12 Months Fair Value	7,494	2,858
Less than 12 Months Unrealized Losses	(114)	(14)
More than 12 Months Fair Value	30,206	31,398
More than 12 Months Unrealized Losses	(6,464)	(5,970)
Fair Value	37,700	34,256
Unrealized Losses	(6,578)	(5,984)
U.S. government agency securities [Member]
Debt Securities Available For Sale Unrealized Loss Position Fair Value [Line Items]
Less than 12 Months Fair Value	4,998	0
Less than 12 Months Unrealized Losses	(2)	0
More than 12 Months Fair Value	5,184	5,291
More than 12 Months Unrealized Losses	(1,076)	(969)
Fair Value	10,182	5,291
Unrealized Losses	(1,078)	(969)
Obligations of state and political subdivisions [Member]
Debt Securities Available For Sale Unrealized Loss Position Fair Value [Line Items]
Less than 12 Months Fair Value	6,788	5,117
Less than 12 Months Unrealized Losses	(108)	(102)
More than 12 Months Fair Value	31,196	30,646
More than 12 Months Unrealized Losses	(3,270)	(3,160)
Fair Value	37,984	35,763
Unrealized Losses	(3,378)	(3,262)
Small business association (SBA) securities [Member]
Debt Securities Available For Sale Unrealized Loss Position Fair Value [Line Items]
Less than 12 Months Fair Value	816	723
Less than 12 Months Unrealized Losses	(2)	(1)
More than 12 Months Fair Value	0	0
More than 12 Months Unrealized Losses	0	0
Fair Value	816	723
Unrealized Losses	$ (2)	$ (1)