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Mergers and Acquisitions (Details Textual) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Feb. 04, 2011
Sep. 30, 2011
RBC Bank (USA) [Member]
Sep. 30, 2011
RBC Bank (USA) [Member]
Aug. 31, 2011
RBC Bank (USA) [Member]
Trust
Sep. 30, 2011
American Trust Bank [Member]
Feb. 04, 2011
American Trust Bank [Member]
Branches
Jul. 23, 2010
Crescent Bank and Trust Company [Member]
Branches
Mergers and Acquisitions (Textual) [Abstract]                      
Assets under management               $ 680,000      
Trust transferred under acquisition               200      
Gain on acquisition   570   9,344   570 570        
Merger-related expenses   326   1,651     1,325   326    
Number of branches in the northwest region of Georgia                   3 11
Value of loans covered in loss-share agreements with the FDIC         73,657           361,472
Other real estate owned covered in loss-share agreements with the FDIC                     50,168
Percentage of eligible losses         80.00%           80.00%
Percentage of eligible recoveries         80.00%           80.00%
Pre-tax gain                   8,774  
Deferred tax liability                   3,356  
After-tax gain                   5418  
Term period of gain recognized     next six years                
Provision for loan losses $ 326 $ 60 $ 1,683 $ 53