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Securities - Amortized Cost and Fair Value of Debt Securities, by Contractual Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Available For Sale Securities Debt Maturities [Abstract]
Amortized Cost, One year or less	$ 34,797
Amortized Cost, After one year through five years	70,423
Amortized Cost, After five years through ten years	44,678
Amortized Cost, After ten years	3,036
Amortized Cost, Total	152,934
Amortized Cost, Mortgage-backed securities	36,350
Amortized Cost	189,284	$ 199,165
Fair Value, One year or less	34,563
Fair Value, After one year through five years	68,544
Fair Value, After five years through ten years	42,533
Fair Value, After ten years	2,835
Fair Value, Total	148,475
Fair Value, Mortgage-backed securities	34,600
Total, Fair Value	$ 183,075	$ 196,398

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