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
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Gross Loans $ 2,121,686 $ 2,048,560 $ 1,976,978
Commercial term includes owner-occupied property loans [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Gross Loans 882,500 774,200  
Commercial lines of credit includes owner-occupied property loans [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Gross Loans 1,300 1,400  
SBA loans includes owner-occupied property loans [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Gross Loans $ 141,900 $ 128,400