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Investment Securities - Summary of Available-for-Sale Debt Securities by Stated Maturity (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Due in one year or less, amortized cost $ 11,885  
Due after one years through five years, amortized cost 57,611  
Due after five through ten years, amortized cost 282,528  
Due after ten years, amortized cost 19,160  
Total Debt Securities Fair Value 711,629  
Due in one year or less, fair value 11,885  
Due after one years through five years, fair value 57,723  
Due after five through ten years, fair value 275,182  
Due after ten years, fair value 19,231  
Amortized Cost 690,118 $ 557,891
Agency-guaranteed residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Agency-guaranteed residential mortgage-backed securities, amortized cost 159,416  
Agency-guaranteed residential mortgage-backed securities, fair value 172,814  
Amortized Cost 159,416 $ 273,252
Agency-guaranteed collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Agency-guaranteed residential mortgage-backed securities, amortized cost 153,952  
Agency-guaranteed residential mortgage-backed securities, fair value 153,952  
Amortized Cost 153,952  
Collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Agency-guaranteed residential mortgage-backed securities, amortized cost 5,566  
Agency-guaranteed residential mortgage-backed securities, fair value 5,566  
Amortized Cost 5,566  
Interest-only GNMA securities    
Debt Securities, Available-for-sale [Line Items]    
Agency-guaranteed residential mortgage-backed securities, amortized cost 0  
Agency-guaranteed residential mortgage-backed securities, fair value $ 15,276