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Investment Securities - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 627,562 $ 557,891
Gross Unrealized Gains 37,235 19,307
Gross Unrealized Losses (39) 0
Fair Value 664,758 577,198
Equity securities, at fair value 2,228 2,406
Investment securities, at fair value 681,382 595,876
Accrued interest receivable 49,911 38,072
Available-for-sale Securities    
Debt Securities, Available-for-sale [Line Items]    
Accrued interest receivable 3,200  
Agency-guaranteed residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 140,019 273,252
Gross Unrealized Gains 4,291 5,069
Gross Unrealized Losses 0 0
Fair Value 144,310 278,321
Agency-guaranteed collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 145,061  
Gross Unrealized Gains 765  
Gross Unrealized Losses 0  
Fair Value 145,826  
State and political subdivision debt securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 17,496  
Gross Unrealized Gains 893  
Gross Unrealized Losses 0  
Fair Value 18,389  
Corporate notes    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 324,986 284,639
Gross Unrealized Gains 31,286 14,238
Gross Unrealized Losses (39) 0
Fair Value 356,233 298,877
Interest-only GNMA securities    
Debt Securities, Available-for-sale [Line Items]    
Interest-only GNMA securities $ 14,396 $ 16,272