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Investment Securities - Summary of Available-for-Sale Debt Securities by Stated Maturity (Detail) $ in Thousands	Jun. 30, 2018 USD ($)
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	179,413
Due after ten years, amortized cost	202,132
Total debt securities, amortized cost	1,206,202
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	171,214
Due after ten years, fair value	189,794
Total debt securities, fair value	1,157,944
Agency-guaranteed residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Agency-guaranteed mortgage backed securities, amortized cost	490,425
Agency-guaranteed mortgage-backed securities, fair value	476,563
Total debt securities, fair value	476,563
Agency-guaranteed commercial real estate mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Agency-guaranteed mortgage backed securities, amortized cost	334,232
Agency-guaranteed mortgage-backed securities, fair value	320,373
Total debt securities, fair value	$ 320,373

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