Quarterly report pursuant to Section 13 or 15(d)

Loans - Loans Receivable (Parenthetical) (Detail)

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Loans - Loans Receivable (Parenthetical) (Detail) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total gross loans $ 2,159,271,000 $ 2,048,560,000 $ 2,048,560,000
Commercial term includes owner-occupied property loans [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total gross loans 816,000,000 774,200,000  
Commercial lines of credit includes owner-occupied property loans [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total gross loans 540,000.0 1,400,000  
SBA loans includes owner-occupied property loans [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total gross loans $ 145,000,000 $ 128,400,000