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Income Taxes - Components of Net Deferred Tax Asset (Liability) (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Deferred tax liabilities:    
Net deferred tax (liability)/asset $ 13,257 $ 800
Federal [Member]
    
Deferred tax assets:    
Bad debt and credit loss deduction 37,970 39,131
Net operating loss carryforward 890 999
Deferred compensation 2,780 2,757
Other intangibles 8 12
Covered loans 22,348 8,537
California franchise tax 1,420 943
Other, net 4,459 6,819
Gross deferred tax asset 69,875 59,198
Deferred tax liabilities:    
Depreciation 6,647 1,845
Intangibles-acquisitions 1,230 2,485
FDIC indemnification asset 18,079 20,387
FHLB stock 6,967 7,777
Deferred income 2,748 2,764
Unrealized gain on investment securities, net 23,236 22,279
Gross deferred tax liability 58,907 57,537
Net deferred tax (liability)/asset 10,968 1,661
State [Member]
    
Deferred tax assets:    
Depreciation    191
Bad debt and credit loss deduction 11,710 12,119
Net operating loss carryforward 398 652
Deferred compensation 872 871
Other intangibles 3 4
FDIC indemnification asset 2,766 900
Capital loss carryforward 133 320
Other, net 1,381 1,648
Gross deferred tax asset 17,263 16,705
Deferred tax liabilities:    
Depreciation 1,393   
Intangibles-acquisitions 559 608
Covered loans 2,729 6,918
FHLB stock 1,744 1,994
Deferred income 466 296
Unrealized gain on investment securities, net 8,083 7,750
Gross deferred tax liability 14,974 17,566
Net deferred tax (liability)/asset $ 2,289 $ (861)