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Securities - Amortized Cost and Fair Value of Debt Securities, by Contractual Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Available For Sale Securities Debt Maturities [Abstract]
Amortized Cost, One year or less	$ 45,762
Amortized Cost, After one year through five years	57,593
Amortized Cost, After five years through ten years	54,003
Amortized Cost, After ten years	1,274
Amortized Cost, Total	158,632
Amortized Cost, Mortgage-backed securities	44,763
Amortized Cost	203,395	$ 172,263
Fair Value, One year or less	45,744
Fair Value, After one year through five years	57,516
Fair Value, After five years through ten years	55,077
Fair Value, After ten years	1,252
Fair Value, Total	159,589
Fair Value, Mortgage-backed securities	44,826
Total, Fair Value	$ 204,415	$ 168,447

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