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Investment Securities - Summary of Available-for-Sale Debt Securities by Stated Maturity (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
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 0  
Due after five through ten years, amortized cost 379,267  
Due after ten years, amortized cost 2,000  
Total Debt Securities Amortized Cost 680,637  
Amortized Cost 680,637 $ 692,674
Due in one year or less, fair value 0  
Due after one years through five years, fair value 0  
Due after five through ten years, fair value 386,316  
Due after ten years, fair value 2,122  
Total available-for-sale debt securities, fair value 689,829 663,294
Total Debt Securities Fair Value 706,986  
Agency-guaranteed residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Agency-guaranteed residential mortgage-backed securities, amortized cost 299,370  
Amortized Cost 299,370 311,267
Agency-guaranteed residential mortgage-backed securities, fair value 301,391  
Total available-for-sale debt securities, fair value 301,391 $ 305,374
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 $ 17,157