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Investment Securities - Summary of Available-for-Sale Debt Securities by Stated Maturity (Detail) $ in Thousands	Sep. 30, 2017 USD ($)
Schedule of Available-for-sale Securities [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	42,958
Due after ten years, amortized cost	2,000
Total debt securities, amortized cost	580,247
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	43,854
Due after ten years, fair value	2,223
Total debt securities, fair value	582,512
Agency-guaranteed residential mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Agency-guaranteed mortgage backed securities, amortized cost	197,606
Agency-guaranteed mortgage-backed securities, fair value	196,327
Agency-guaranteed commercial real estate mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Agency-guaranteed mortgage backed securities, amortized cost	337,683
Agency-guaranteed mortgage-backed securities, fair value	$ 340,108

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