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Income Taxes - Components of Net Deferred Tax Asset (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets:    
Bad debt and credit loss deduction $ 24,282 $ 22,402
Net operating loss carryforward 75 141
Deferred compensation 6,942 6,109
PCI loans 2,299 2,556
California franchise tax 4,281 837
Accrued expense 4,831 4,865
Unrealized loss on investment securities, net 0 7,508
Acquired loan discounts 15,180 25,555
Lease liability 6,175  
Other, net 1,453 2,624
Gross deferred tax asset 65,518 72,597
Deferred tax liabilities:    
Depreciation 3,895 4,440
Intangibles—acquistions 16,941 19,843
FHLB stock 2,525 2,527
Deferred income 3,055 2,716
Right of use asset 5,893  
Unrealized gain on investment securities, net 6,968  
Gross deferred tax liability 39,277 29,526
Net deferred tax asset $ 26,241 $ 43,071