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Fair Value of Financial Instruments (Narrative, Assets Measured at Fair Value on a Nonrecurring Basis) (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
Nonrecurring Basis
Mar. 31, 2013
Nonrecurring Basis
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Impaired loans, aggregate outstanding principal balance $ 21,519,000 $ 24,125,000   $ 3,100,000
Impaired loans, fair value       2,500,000
Losses on impaired loans charged through allowance for loan losses     600,000  
Recorded losses for other real estate owned