Quarterly report pursuant to Section 13 or 15(d)

Loans - Loans Receivable (Parenthetical) (Detail)

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Loans - Loans Receivable (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total gross loans $ 2,187,389 $ 2,048,560 $ 1,949,624
Commercial term includes owner-occupied property loans [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total gross loans 838,500 774,200  
Commercial lines of credit includes owner-occupied property loans [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total gross loans 1,000 1,400  
SBA loans includes owner-occupied property loans [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total gross loans $ 142,900 $ 128,400