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
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Real estate loans [Member]
Sep. 30, 2013
Real estate loans [Member]
Sep. 30, 2014
Commercial property [Member]
Owner occupied real estate [Member]
Real estate loans [Member]
Dec. 31, 2013
Commercial property [Member]
Owner occupied real estate [Member]
Real estate loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total gross loans $ 2,675,959 $ 2,159,271 $ 2,411,154 $ 1,921,659 $ 1,100,000 $ 957,300