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Loan and Lease Finance Receivables and Allowance for Loan Losses - Summary of Components of Loan and Lease Finance Receivables (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Commercial and industrial $ 531,391   $ 573,571      
Commercial real estate 2,273,704   2,169,535      
Construction 48,309   61,300      
SFR mortgage 192,457   160,703      
Dairy & livestock and agribusiness 265,297   342,311      
Municipal lease finance receivables 99,188   105,767      
Consumer and other loans 57,988   66,610      
Gross loans 3,468,334   3,479,797      
Purchase accounting discount (14,529)   (25,344)      
Deferred loan fees, net (9,119)   (6,925)      
Gross loans, net of deferred loan fees and discount 3,281,352   3,252,313      
Less: Allowance for loan losses (80,713) (85,457) (92,441) (92,067) (91,892) (93,964)
Net loans 3,363,973   3,355,087      
Non-Covered Loans [Member]
           
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Commercial and industrial 510,566   547,422      
Commercial real estate 2,126,415   1,990,107      
Construction 47,648   59,721      
SFR mortgage 192,130   159,288      
Dairy & livestock and agribusiness 261,638   336,660      
Municipal lease finance receivables 99,188   105,767      
Consumer and other loans 52,886   60,273      
Gross loans 3,290,471   3,259,238      
Deferred loan fees, net (9,119)   (6,925)      
Gross loans, net of deferred loan fees and discount 3,281,352   3,252,313      
Less: Allowance for loan losses (80,713)   (92,441)      
Net loans 3,200,639   3,159,872      
Covered Loans [Member]
           
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Commercial and industrial 20,825   26,149      
Commercial real estate 147,289   179,428      
Construction 661   1,579      
SFR mortgage 327   1,415      
Dairy & livestock and agribusiness 3,659   5,651      
Consumer and other loans 5,102   6,337      
Gross loans 177,863   220,559      
Purchase accounting discount (14,529)   (25,344)      
Gross loans, net of deferred loan fees and discount 163,334   195,215      
Less: Allowance for loan losses                  
Net loans $ 163,334   $ 195,215