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Investment Securities - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 690,118 $ 557,891
Gross Unrealized Gains 14,869 19,307
Gross Unrealized Losses (8,634) 0
Fair Value 696,353 577,198
Equity securities, at fair value 1,028 2,406
Investment securities, at fair value 712,657 595,876
Accrued interest receivable 40,570 38,072
Available-for-sale Securities    
Debt Securities, Available-for-sale [Line Items]    
Accrued interest receivable 4,700  
Agency-guaranteed residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 159,416 273,252
Gross Unrealized Gains 13,398 5,069
Gross Unrealized Losses 0 0
Fair Value 172,814 278,321
Agency-guaranteed collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 153,952  
Gross Unrealized Gains 0  
Gross Unrealized Losses 0  
Fair Value 153,952  
State and political subdivision debt securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 15,157  
Gross Unrealized Gains 0  
Gross Unrealized Losses 0  
Fair Value 15,157  
Collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 5,566  
Gross Unrealized Gains 0  
Gross Unrealized Losses 0  
Fair Value 5,566  
Corporate notes    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 356,027 284,639
Gross Unrealized Gains 1,471 14,238
Gross Unrealized Losses (8,634) 0
Fair Value 348,864 298,877
Interest-only GNMA securities    
Debt Securities, Available-for-sale [Line Items]    
Interest-only GNMA securities $ 15,276 $ 16,272