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Shareholders' Equity (Additional Information) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Apr. 26, 2001
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 481,791   481,791  
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date 95.00%   95.00%  
Common Stock, Authorized Shares Repurchase       607,754
Stock Repurchase Program Cumulative Number Of Shares Repurchased 334,965   334,965  
Schedule Of Share Based Compensation Restricted Stock and Restricted Stock Vested In Percentage 100.00%   100.00%  
Schedule Of Share Based Compensation Restricted Stock and Restricted Stock Grant During Period Percentage 50.00%   50.00%  
Schedule Of Share Based Compensation Restricted Stock and Restricted Stock Cash Credit Entitlement Percentage 50.00%   50.00%  
Unrecognized Stock Expenses In Restricted Stock $ 1,112 $ 601 $ 101  
Restricted Share Grants (in shares) 29,170 30,019    
Share Based Compensation Arrangement By Share Based Payment Award Options Vested In Period Percentage 33.30%      
Bank [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Retained Earnings, Unappropriated     $ 26,000  
Employee Stock Purchase Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 500,000   500,000