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Loans and Allowance for Loan Losses (Details 4) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Categories of impaired loans    
Non-accrual loans $ 31,081 $ 46,403
Troubled debt restructurings continuing to accrue interest 8,282 7,217
Total impaired loans $ 39,363 $ 53,620