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Investment Securities - Summary of Available-for-Sale Debt Securities by Stated Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Due in one year or less, amortized cost	$ 0
Due after one years through five years, amortized cost	0
Due after five through ten years, amortized cost	354,268
Due after ten years, amortized cost	27,066
Amortized Cost	687,985	$ 692,674
Due in one year or less, fair value	0
Due after one years through five years, fair value	0
Due after five through ten years, fair value	345,717
Due after ten years, fair value	26,561
Total debt securities, fair value	676,422	663,294
Agency-guaranteed residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Agency-guaranteed residential mortgage-backed securities, amortized cost	306,651
Amortized Cost	306,651	311,267
Agency-guaranteed residential mortgage-backed securities, fair value	304,144
Total debt securities, fair value	$ 304,144	$ 305,374

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