Investment Securities - Summary of Fixed Maturity Securities Available for Sale (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 62,189	$ 60,573
Gross Unrealized Gains	54	21
Gross Unrealized Losses	(6,413)	(6,312)
Fair Value	55,830	54,282
Mortgage-backed Securities, Principally Obligations of US Federal Agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	43,255	44,653
Gross Unrealized Gains	2	0
Gross Unrealized Losses	(4,763)	(4,791)
Fair Value	38,494	39,862
State and Municipalities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	16,751	13,733
Gross Unrealized Gains	52	21
Gross Unrealized Losses	(1,620)	(1,501)
Fair Value	15,183	12,253
Agency Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,183	2,187
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(30)	(20)
Fair Value	$ 2,153	$ 2,167