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Loans and Allowance for Loan Losses (Related Party Loans Receivable) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Loans and Leases Receivable, Related Parties [Roll Forward]    
Loans outstanding at January 1 $ 1,791 $ 4,485
New loans and advances 92 13,341
Repayments (1,285) (15,879)
Retirements (18) (156)
Loans outstanding at December 31 $ 580 $ 1,791