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Impaired Loans, Condensed Information Impaired Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Financing Receivable, Impaired [Line Items]    
Impaired loans without a valuation allowance $ 35,937 [1] $ 49,625 [1]
Impaired loans with a valuation allowance 47,266 [1] 48,704 [1]
Total impaired loans 83,203 [1],[2] 98,329 [1],[2]
Valuation allowance related to impaired loans 7,671 8,754
Total non-accrual loans 36,715 [3] 56,110 [3]
Total loans past-due ninety days or more and still accruing   $ 48
[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