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, 2014
Dec. 31, 2013
Mar. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total gross loans $ 2,276,372 $ 2,234,089 $ 2,121,686
Real estate loans [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total gross loans 2,027,914 1,969,798 1,882,445
Real estate loans [Member] | Owner occupied real estate [Member] | Commercial property [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total gross loans $ 958,400 $ 957,300