Available for Sale Securities - Summary of Gross Unrealized Losses on Securities Available-for-sale and Fair Values (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 1,740	$ 30,114
Unrealized Loss	(5)	(1,786)
Fair Value	57,441	83,955
Unrealized Loss	(9,799)	(13,961)
Fair Value	59,181	114,069
Unrealized Loss	(9,804)	(15,747)
U.S. Treasury notes [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value		0
Unrealized Loss		0
Fair Value		26,627
Unrealized Loss		(2,970)
Fair Value		26,627
Unrealized Loss		(2,970)
Obligations of States and Political Subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value	0	5,088
Unrealized Loss	0	(396)
Fair Value	13,889	12,145
Unrealized Loss	(2,815)	(3,333)
Fair Value	13,889	17,233
Unrealized Loss	(2,815)	(3,729)
Government-sponsored Mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value	0	19,084
Unrealized Loss	0	(1,310)
Fair Value	40,983	45,183
Unrealized Loss	(6,960)	(7,658)
Fair Value	40,983	64,267
Unrealized Loss	(6,960)	(8,968)
Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value	1,740	4,517
Unrealized Loss	(5)	(46)
Fair Value	1,832	0
Unrealized Loss	(16)	0
Fair Value	3,572	4,517
Unrealized Loss	(21)	(46)
Certificates of Deposit [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value	0	1,425
Unrealized Loss	0	(34)
Fair Value	737	0
Unrealized Loss	(8)	0
Fair Value	737	1,425
Unrealized Loss	$ (8)	$ (34)