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Investment Securities - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 1,106,966 $ 557,891
Gross Unrealized Gains 24,757 19,307
Gross Unrealized Losses (358) 0
Fair Value 1,131,365 577,198
Equity securities, at fair value 2,466 2,406
Investment securities, at fair value 1,133,831 595,876
Accrued interest receivable 65,668 38,072
Available-for-sale Securities    
Debt Securities, Available-for-sale [Line Items]    
Accrued interest receivable 4,200  
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 374,151  
Gross Unrealized Gains 1,404  
Gross Unrealized Losses (174)  
Fair Value 375,381  
U.S. government agencies securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 40,000  
Gross Unrealized Gains 8  
Gross Unrealized Losses 0  
Fair Value 40,008  
Agency-guaranteed residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 59,013 273,252
Gross Unrealized Gains 2,066 5,069
Gross Unrealized Losses 0 0
Fair Value 61,079 278,321
Agency-guaranteed collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 153,088  
Gross Unrealized Gains 771  
Gross Unrealized Losses (80)  
Fair Value 153,779  
State and political subdivision debt securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 17,391  
Gross Unrealized Gains 868  
Gross Unrealized Losses 0  
Fair Value 18,259  
Private label collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 118,979  
Gross Unrealized Gains 8  
Gross Unrealized Losses 0  
Fair Value 118,987  
Corporate notes    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 344,344 284,639
Gross Unrealized Gains 19,632 14,238
Gross Unrealized Losses (104) 0
Fair Value $ 363,872 298,877
Interest-only GNMA securities    
Debt Securities, Available-for-sale [Line Items]    
Interest-only GNMA securities   $ 16,272