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Investment Securities - Summary of Available-for-Sale Debt Securities by Stated Maturity (Detail)
$ in Thousands
Sep. 30, 2019
USD ($)
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 5,000
Due after five through ten years, amortized cost 277,662
Due after ten years, amortized cost 2,000
Total Debt Securities Amortized Cost 573,492
Due in one year or less, fair value 0
Due after one years through five years, fair value 5,238
Due after five through ten years, fair value 289,862
Due after ten years, fair value 2,098
Total Debt Securities Fair Value 606,619
Agency-guaranteed residential mortgage-backed securities  
Debt Securities, Available-for-sale [Line Items]  
Agency-guaranteed residential mortgage-backed securities, amortized cost 288,830
Agency-guaranteed residential mortgage-backed securities, fair value 292,343
Interest-only classes of agency-guaranteed home equity conversion mortgage-backed securities, reported at fair value based on a fair value option election  
Debt Securities, Available-for-sale [Line Items]  
Agency-guaranteed residential mortgage-backed securities, amortized cost 0
Agency-guaranteed residential mortgage-backed securities, fair value $ 17,078