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Securities - Amortized Cost and Fair Value of Debt Securities, by Contractual Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Available For Sale Securities Debt Maturities [Abstract]
Amortized Cost, One year or less	$ 30,977
Amortized Cost, After one year through five years	60,395
Amortized Cost, After five years through ten years	45,454
Amortized Cost, After ten years	1,278
Amortized Cost, Total	138,104
Amortized Cost, Mortgage-backed securities	38,619
Amortized Cost	176,723	$ 172,263
Fair Value, One year or less	30,820
Fair Value, After one year through five years	59,594
Fair Value, After five years through ten years	45,152
Fair Value, After ten years	1,222
Fair Value, Total	136,788
Fair Value, Mortgage-backed securities	37,894
Total, Fair Value	$ 174,682	$ 168,447

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