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Income Taxes - Schedule of Income Tax Asset (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Current:    
Income tax asset , Current, Total $ 19,103 $ 14,659
Deferred:    
Income tax asset , Deferred, Total 43,071 25,387
Income tax asset (liability), Total 62,174 40,046
Federal [Member]    
Current:    
Income tax asset , Current, Total 12,303 11,713
Deferred:    
Income tax asset , Deferred, Total 27,334 16,557
State [Member]    
Current:    
Income tax asset , Current, Total 6,800 2,946
Deferred:    
Income tax asset , Deferred, Total $ 15,737 $ 8,830