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Securities - Amortized Cost and Fair Value of Debt Securities, by Contractual Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Available For Sale Securities Debt Maturities [Abstract]
Amortized Cost, One year or less	$ 30,708
Amortized Cost, After one year through five years	52,474
Amortized Cost, After five years through ten years	46,971
Amortized Cost, After ten years	1,271
Amortized Cost, Total	131,424
Amortized Cost, Mortgage-backed securities	57,180
Amortized Cost	188,604	$ 172,263
Fair Value, One year or less	30,702
Fair Value, After one year through five years	52,597
Fair Value, After five years through ten years	48,433
Fair Value, After ten years	1,272
Fair Value, Total	133,004
Fair Value, Mortgage-backed securities	57,461
Total, Fair Value	$ 190,465	$ 168,447

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