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Investment Securities - Summary of Fixed Maturity Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 45,155 $ 48,614
Gross Unrealized Gains 1,684 597
Gross Unrealized Losses (47) (213)
Fair Value 46,792 48,998
Mortgage-backed Securities, Principally Obligations of US Federal Agencies [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 34,929 36,335
Gross Unrealized Gains 1,495 411
Gross Unrealized Losses (45) (112)
Fair Value 36,379 36,634
State and Municipalities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 10,226 12,279
Gross Unrealized Gains 189 186
Gross Unrealized Losses (2) (101)
Fair Value $ 10,413 $ 12,364