Investment Securities - Summary of Fixed Maturity Securities Available for Sale (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 54,459	$ 44,494
Gross Unrealized Gains	0	732
Gross Unrealized Losses	(6,105)	(454)
Fair Value	48,354	44,772
Mortgage-backed Securities, Principally Obligations of US Federal Agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	45,444	35,469
Gross Unrealized Gains	0	672
Gross Unrealized Losses	(5,356)	(403)
Fair Value	40,088	35,738
State and Municipalities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	9,015	9,025
Gross Unrealized Gains	0	60
Gross Unrealized Losses	(749)	(51)
Fair Value	$ 8,266	$ 9,034

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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