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Loan and Lease Finance Receivables and Allowance for Credit Losses - Summary of Components of Loan and Lease Finance Receivables (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Commercial and industrial $ 573,571 $ 523,950  
Construction 61,300 94,831  
Commercial real estate 2,169,535 2,171,399  
SFR mortgage 160,703 179,731  
Consumer 53,894 59,789  
Municipal lease finance receivables 105,767 113,629  
Auto and equipment leases, net of unearned discount 12,716 17,370  
Dairy and livestock 327,579 343,549  
Agribusiness 14,732 28,523  
Gross loans 3,479,797 3,532,771  
Purchase accounting discount (25,344) (50,780)  
Deferred loan fees, net (6,925) (5,395)  
Gross loans, net of deferred loan fees 3,252,313 3,219,727  
Less: Allowance for credit losses (92,441) (93,964) (105,259)
Net loans 3,355,087 3,382,632  
Non-Covered Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Commercial and industrial 547,422 494,299  
Construction 59,721 76,146  
Commercial real estate 1,990,107 1,948,292  
SFR mortgage 159,288 176,442  
Consumer 47,557 51,436  
Municipal lease finance receivables 105,767 113,460  
Auto and equipment leases, net of unearned discount 12,716 17,370  
Dairy and livestock 327,579 343,350  
Agribusiness 9,081 4,327  
Gross loans 3,259,238 3,225,122  
Deferred loan fees, net (6,925) (5,395)  
Gross loans, net of deferred loan fees 3,252,313 3,219,727  
Less: Allowance for credit losses (92,441) (93,964)  
Net loans 3,159,872 3,125,763  
Covered Loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Commercial and industrial 26,149 29,651  
Construction 1,579 18,685  
Commercial real estate 179,428 223,107  
SFR mortgage 1,415 3,289  
Consumer 6,337 8,353  
Municipal lease finance receivables   169  
Dairy and livestock   199  
Agribusiness 5,651 24,196  
Gross loans 220,559 307,649  
Purchase accounting discount (25,344) (50,780)  
Gross loans, net of deferred loan fees 195,215 256,869  
Net loans $ 195,215 $ 256,869