Investment Securities - Summary of Fair Value of Available For Sale Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Debt Securities Available For Sale Unrealized Loss Position Fair Value [Line Items]
Less than 12 Months Fair Value	$ 16,223	$ 52,026
Less than 12 Months Unrealized Losses	(1,027)	(5,235)
More than 12 Months Fair Value	60,475	25,574
More than 12 Months Unrealized Losses	(10,916)	(6,370)
Fair Value	76,698	77,600
Unrealized Losses	(11,943)	(11,605)
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	1,713	15,605
Less than 12 Months Unrealized Losses	(77)	(1,778)
More than 12 Months Fair Value	31,480	19,137
More than 12 Months Unrealized Losses	(6,425)	(4,824)
Fair Value	33,193	34,742
Unrealized Losses	(6,502)	(6,602)
U.S. government agency securities [Member]
Debt Securities Available For Sale Unrealized Loss Position Fair Value [Line Items]
Less than 12 Months Fair Value	0	0
Less than 12 Months Unrealized Losses	0	0
More than 12 Months Fair Value	5,181	5,085
More than 12 Months Unrealized Losses	(1,079)	(1,175)
Fair Value	5,181	5,085
Unrealized Losses	(1,079)	(1,175)
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	12,409	36,421
Less than 12 Months Unrealized Losses	(367)	(3,457)
More than 12 Months Fair Value	23,814	1,352
More than 12 Months Unrealized Losses	(3,412)	(371)
Fair Value	36,223	37,773
Unrealized Losses	(3,779)	$ (3,828)
SBIC securities [Member]
Debt Securities Available For Sale Unrealized Loss Position Fair Value [Line Items]
Less than 12 Months Fair Value	2,101
Less than 12 Months Unrealized Losses	(583)
More than 12 Months Fair Value	0
More than 12 Months Unrealized Losses	0
Fair Value	2,101
Unrealized Losses	$ (583)