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Income Taxes - Components of Net Deferred Tax Asset (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Federal [Member]    
Deferred tax assets:    
Bad debt and credit loss deduction $ 23,886 $ 23,180
Depreciation 0 121
Net operating loss carryforward 453 562
Deferred compensation 4,044 3,642
PCI loans 9,512 10,572
FDIC loss sharing asset 0 210
California franchise tax 3,269 2,613
Accrued expense 4,046 3,005
Other, net 1,563 892
Gross deferred tax asset 46,773 44,797
Deferred tax liabilities:    
Depreciation 2,207  
Intangibles - acquisitions 2,705 868
FHLB stock 2,612 2,747
Deferred income 3,130 2,745
Unrealized gain on investment securities, net 4,553 9,638
Gross deferred tax liability 15,207 15,998
Net deferred tax asset 31,566 28,799
State [Member]    
Deferred tax assets:    
Bad debt and credit loss deduction 7,398 7,172
Depreciation 39 440
Deferred compensation 1,252 1,127
PCI loans 2,635 3,242
FDIC loss sharing asset   97
Accrued expense 1,253 931
Other, net 547 275
Gross deferred tax asset 13,124 13,284
Deferred tax liabilities:    
Intangibles - acquisitions 838 269
FHLB stock 809 851
Deferred income 969 762
Unrealized gain on investment securities, net 1,582 3,352
Gross deferred tax liability 4,198 5,234
Net deferred tax asset $ 8,926 $ 8,050