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Fair Value Measurements (Details Textual) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Fair Value Disclosures [Abstract]          
Fair Value, Option, Changes in Fair Value, Gain (Loss) $ 1,315   $ 472    
Fair Value Measurements (Textual) [Abstract]          
Impaired loans not covered under loss-share agreements 10,782   10,782   27,149
Specific reserve included in allowance for loan losses 2,208   2,208   6,971
Impairment losses on mortgage servicing rights $ 0 $ 0 $ 0 $ 0