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Condensed Information of Impaired Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Financing Receivable, Impaired [Line Items]    
Impaired loans without a valuation allowance $ 20,965 [1] $ 14,292 [1]
Impaired loans with a valuation allowance 55,075 [1] 63,870 [1]
Total impaired loans (1) 76,040 [1] 78,162 [1]
Valuation allowance related to impaired loans 6,215 7,125
Total non-accrual loans $ 50,566 [2] $ 53,094 [2]
[1] Principal balance on Company's books, less any direct charge offs.
[2] Included in Total Financing Receivables