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Investment Securities - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 692,674  
Gross Unrealized Gains 920  
Gross Unrealized Losses (30,300)  
Available-for-sale securities, debt securities 663,294  
Investment securities available for sale, fair value 665,012 $ 471,371
Amortized Cost   472,300
Gross Unrealized Gains   2,639
Gross Unrealized Losses   3,568
Equity Investment securities, at fair value 1,718  
Investment securities, at fair value   471,371
Agency-guaranteed residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 311,267  
Gross Unrealized Gains 0  
Gross Unrealized Losses (5,893)  
Available-for-sale securities, debt securities 305,374  
Amortized Cost   186,221
Gross Unrealized Gains   36
Gross Unrealized Losses   2,799
Investment securities, at fair value   183,458
Agency-guaranteed commercial real estate mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost   238,809
Gross Unrealized Gains   432
Gross Unrealized Losses   769
Investment securities, at fair value   238,472
Corporate notes    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 381,407  
Gross Unrealized Gains 920  
Gross Unrealized Losses (24,407)  
Available-for-sale securities, debt securities $ 357,920  
Amortized Cost   44,959
Gross Unrealized Gains   1,130
Gross Unrealized Losses   0
Investment securities, at fair value   46,089
Equity securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost   2,311
Gross Unrealized Gains   1,041
Gross Unrealized Losses   0
Investment securities, at fair value   $ 3,352