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Fair Value, impaired loans (Details) (Nonrecurring [Member], USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired Loans $ 57,495 $ 49,901
Other Real Estate 6,595 7,576
Impaired loans [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Gains (Losses) (5,408) (11,864)
Other real estate [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Gains (Losses) (710) (1,322)
Level 1 Valuation [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired Loans 0 0
Other Real Estate 0 0
Level 2 Valuation [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired Loans 0 431
Other Real Estate 0 0
Level 3 Valuation [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired Loans 57,495 49,470
Other Real Estate $ 6,595 $ 7,576