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Securities - Amortized Cost and Fair Value of Debt Securities, by Contractual Maturity (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Available For Sale Securities Debt Maturities [Abstract]
Amortized Cost, One year or less	$ 29,477
Amortized Cost, After one year through five years	67,009
Amortized Cost, After five years through ten years	37,154
Amortized Cost, After ten years	1,281
Amortized Cost, Total	134,921
Amortized Cost, Mortgage-backed securities	37,342
Amortized Cost	172,263	$ 199,165
Fair Value, One year or less	29,235
Fair Value, After one year through five years	65,755
Fair Value, After five years through ten years	36,000
Fair Value, After ten years	1,195
Fair Value, Total	132,185
Fair Value, Mortgage-backed securities	36,262
Total, Fair Value	$ 168,447	$ 196,398

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