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Disclosures About Fair Value Measurements (Assets Measured at Fair Value Measured on Non-Recurring Basis) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
Level 3 [Member]
Mar. 31, 2013
Level 3 [Member]
Minimum [Member]
Dec. 31, 2012
Level 3 [Member]
Minimum [Member]
Mar. 31, 2013
Level 3 [Member]
Maximum [Member]
Dec. 31, 2012
Level 3 [Member]
Maximum [Member]
Mar. 31, 2013
Fair Value Measurements, Nonrecurring Basis [Member]
Dec. 31, 2012
Fair Value Measurements, Nonrecurring Basis [Member]
Mar. 31, 2013
Fair Value Measurements, Nonrecurring Basis [Member]
Level 1 [Member]
Dec. 31, 2012
Fair Value Measurements, Nonrecurring Basis [Member]
Level 1 [Member]
Mar. 31, 2013
Fair Value Measurements, Nonrecurring Basis [Member]
Level 2 [Member]
Dec. 31, 2012
Fair Value Measurements, Nonrecurring Basis [Member]
Level 2 [Member]
Mar. 31, 2013
Fair Value Measurements, Nonrecurring Basis [Member]
Level 3 [Member]
Dec. 31, 2012
Fair Value Measurements, Nonrecurring Basis [Member]
Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                              
Other real estate owned               $ 1,205 $ 1,228             $ 1,205 $ 1,228
Liquidation Expense       1.00% 1.00% 15.00% 15.00%                
Estimated Liquidation Expense       1.00% 1.00% 20.00% 20.00%                
Valuation Techniques     Appraisal of Collateral                        
Appraisal of Adjustment       1.00% 1.00% 35.00% 35.00%                
Carrying value of impaired loans $ 2,339 $ 4,806           $ 1,862 $ 3,220             $ 1,862 $ 3,220