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Investment Securities - Summary of Amortized Cost and Estimated Market Value of Investment Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Available-for-sale Securities, Debt Maturities [Abstract]
Amortized Cost, due in one year or less	$ 25
Amortized Cost, due after one year through five years	12,485
Amortized Cost, due after five years through ten years	14,499
Amortized Cost, due after ten years	18,146
Amortized Cost	45,155	$ 48,614
Market Value, due in one year or less	25
Market Value, due after one year through five years	12,956
Market Value, due after five years through ten years	15,214
Market Value, due after ten years	18,597
Market Value, total	$ 46,792	$ 48,998

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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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