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Investment Securities - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 557,891 $ 692,674
Gross Unrealized Gains 19,307 920
Gross Unrealized Losses 0 (30,300)
Fair Value 577,198 663,294
Equity securities 2,406 1,718
Total investment securities, at fair value 595,876 665,012
Agency-guaranteed residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 273,252 311,267
Gross Unrealized Gains 5,069 0
Gross Unrealized Losses 0 (5,893)
Fair Value 278,321 305,374
Corporate notes    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 284,639 381,407
Gross Unrealized Gains 14,238 920
Gross Unrealized Losses 0 (24,407)
Fair Value 298,877 $ 357,920
Interest-only GNMA securities    
Debt Securities, Available-for-sale [Line Items]    
Interest-only GNMA securities $ 16,272