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Investment Securities - Summary of Investment Securities by Stated Maturity (Detail)
$ in Thousands
Dec. 31, 2019
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 15,000
Amortized cost, due after five years through ten years 267,639
Amortized cost, due after ten years 2,000
Total Debt Securities Amortized Cost 557,891
Fair value, due in one year or less 0
Fair value, due after one year through five years 15,206
Fair value, due after five years through ten years 281,607
Fair value, due after ten years 2,064
Total Debt Securities Fair Value 593,470
Agency-guaranteed residential mortgage-backed securities  
Debt Securities, Available-for-sale [Line Items]  
Mortgage-backed securities, amortized cost 273,252
Mortgage-backed securities, fair value 278,321
Interest-only GNMA securities  
Debt Securities, Available-for-sale [Line Items]  
Mortgage-backed securities, amortized cost 0
Mortgage-backed securities, fair value $ 16,272