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Non-Covered 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
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans, net of deferred loan fees $ 3,257,559 $ 3,385,916    
Less: Allowance for non-covered loan losses (68,725) (75,235)    
Non-Covered Loans [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial and industrial 490,653 512,792    
Commercial real estate 2,194,051 2,207,515    
Construction 42,906 47,109    
SFR mortgage 189,899 189,233    
Dairy & livestock and agribusiness 212,957 294,292    
Municipal lease finance receivables 81,041 89,106    
Consumer and other loans 54,815 55,103    
Gross non-covered loans 3,266,322 3,395,150    
Less: Deferred loan fees, net (8,763) (9,234)    
Gross loans, net of deferred loan fees 3,257,559 3,385,916    
Less: Allowance for non-covered loan losses (68,725) (75,235) (92,218) (92,441)
Net covered loans $ 3,188,834 $ 3,310,681