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Investment Securities - Summary of Investment Securities by Stated Maturity (Detail) $ in Thousands	Dec. 31, 2018 USD ($)
Debt Securities, Available-for-sale [Line Items]
Amortized cost, due in one year or less	$ 0
Amortized cost, due after one year through five years	0
Amortized cost, due after five years through ten years	329,096
Amortized cost, due after ten years	52,311
Amortized Cost	692,674
Fair value, due in one year or less	0
Fair value, due after one year through five years	0
Fair value, due after five years through ten years	308,578
Fair value, due after ten years	49,342
Total debt securities, fair value	663,294
Agency-guaranteed residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Mortgage-backed securities, amortized cost	311,267
Amortized Cost	311,267
Mortgage-backed securities, fair value	305,374
Total debt securities, fair value	$ 305,374

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