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Loans, Allowance for Loan and Lease Losses, and Reserve for Off-Balance Sheet Credit Commitments (Details 2) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2011
Nevada Commerce Bank
Apr. 08, 2011
Nevada Commerce Bank
Acquired loans        
Preliminary estimates of the contractually required payments receivable for all acquired impaired covered loans     $ 107,400,000  
Cash flows expected to be collected     66,200,000  
Fair value of acquired impaired loans     55,300,000  
FDIC indemnification asset 150,018,000 204,259,000   33,800,000
Changes in Accretable Yield for Acquired Impaired Loans        
Balance at the beginning of the period 436,374,000 562,826,000    
Additions   10,871,000    
Accretion (79,839,000) (104,056,000)    
Reclassifications from nonaccretable yield 11,664,000 33,704,000    
Disposals and other (72,386,000) (66,971,000)    
Balance at the end of the period $ 295,813,000 $ 436,374,000