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Securities - Amortized Cost and Fair Value of Debt Securities, by Contractual Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Available For Sale Securities Debt Maturities [Abstract]
Amortized Cost, One year or less	$ 16,663
Amortized Cost, After one year through five years	19,720
Amortized Cost, After five years through ten years	59,816
Amortized Cost, After ten years	4,079
Amortized Cost, Total	100,278
Amortized Cost, Mortgage-backed securities	97,726
Amortized Cost	198,004	$ 220,904
Fair Value, One year or less	16,766
Fair Value, After one year through five years	20,130
Fair Value, After five years through ten years	62,399
Fair Value, After ten years	4,132
Fair Value, Total	103,427
Fair Value, Mortgage-backed securities	100,694
Total, Fair Value	$ 204,121	$ 222,293

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