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Trust Preferred Capital Notes (Details) (USD $)
 3 Months Ended 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
Trust II [Member]
Sep. 20, 2007
Trust II [Member]
Mar. 31, 2013
Maximum [Member]
Trust Preferred Capital Notes [Line Items]          
Trust preferred securities issued by subsidiary trust     $ 7,000,000 $ 7,000,000  
Common equity issued by subsidiary trust       217,000  
Trust preferred capital notes $ 7,217,000 $ 7,217,000   $ 7,200,000  
Floating rate of interest     1.91%    
Redemption date of securities September 1, 2037        
Portion of trust preferred securities in Tier 1 capital, percentage         25.00%