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Investment Securities - Summary of Available-for-Sale Debt Securities by Stated Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Due in one year or less, amortized cost	$ 0
Due after one year through five years, amortized cost	0
Due after five years through ten years, amortized cost	229,807
Due after ten years, amortized cost	151,668
Amortized Cost	698,260	$ 472,300
Due in one year or less, fair value	0
Due after one year through five years, fair value	0
Due after five years through ten years, fair value	218,904
Due after ten years, fair value	142,710
Total debt securities, fair value	667,032	471,371
Agency-guaranteed residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Agency-guaranteed mortgage backed securities, amortized cost	316,785
Amortized Cost	316,785	186,221
Agency-guaranteed mortgage-backed securities, fair value	305,418
Total debt securities, fair value	$ 305,418	$ 183,458

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