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Income Taxes - Components of Net Deferred Tax Asset (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Bad debt and credit loss deduction	$ 32,671	$ 24,282
Net operating loss carryforward	10	75
Deferred compensation	6,607	6,942
PCI loans	663	2,299
California franchise tax	4,584	4,281
Accrued expense	4,662	4,831
Acquired loan discounts	9,709	15,180
Lease liability	6,369	6,175
Other, net	3,865	1,453
Gross deferred tax asset	69,140	65,518
Deferred tax liabilities:
Depreciation	2,675	3,895
Intangibles—acquistions	15,376	16,941
FHLB stock	2,525	2,525
Deferred income	3,544	3,055
Right of use asset	6,080	5,893
Unrealized gain on investment securities, net	17,418	6,968
Gross deferred tax liability	47,618	39,277
Net deferred tax asset	$ 21,522	$ 26,241

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