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Securities - Amortized Cost and Fair Value of Debt Securities, by Contractual Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Available For Sale Securities Debt Maturities [Abstract]
Amortized Cost, One year or less	$ 14,403
Amortized Cost, After one year through five years	47,971
Amortized Cost, After five years through ten years	59,979
Amortized Cost, After ten years	6,297
Amortized Cost, Total	128,650
Amortized Cost, Mortgage-backed securities	100,864
Amortized Cost	229,514	$ 220,904
Fair Value, One year or less	14,462
Fair Value, After one year through five years	49,006
Fair Value, After five years through ten years	62,574
Fair Value, After ten years	6,551
Fair Value, Total	132,593
Fair Value, Mortgage-backed securities	103,699
Total, Fair Value	$ 236,292	$ 222,293

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