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Condensed Information of Impaired Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Financing Receivable, Impaired [Line Items]    
Impaired loans without a valuation allowance $ 24,772 [1] $ 14,292 [1]
Impaired loans with a valuation allowance 40,844 [1] 63,870 [1]
Total impaired loans (1) 65,616 [1],[2] 78,162 [1],[2]
Valuation allowance related to impaired loans 7,150 7,125
Total non-accrual loans 42,309 [3] 53,094 [3]
Total loans past-due ninety days or more and still accruing $ 2 $ 0
[1] Principal balance on Company's books, less any direct charge offs.
[2] Principal balance on Company's books less any direct charge-off
[3] Included in Total Financing Receivables