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Fair Value of Instruments (Details Textual) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Fair Value of Financial Instruments (Textual) [Abstract]      
Impaired Loans Categorized as Level 3 $ 4,144 $ 4,591 $ 1,867
Specific Allocation for Impaired Loans 860   191
Fair Value of Financial Instruments (Additional Textual) [Abstract]      
Interest-Bearing Deposits Maturing 90 days    
Carrying Amounts of Dividends Payable, Number of days 40 days    
Impairment of Mortgage servicing rights   16  
No impairment charge to other expense was required to adjust these assets to their estimated fair values 0 0  
Fair Value on a Recurring Basis [Member]
      
Fair Value of Financial Instruments (Textual) [Abstract]      
Specific Allocation for Impaired Loans 860 865  
Significant Unobservable Inputs (Level 3) [Member]
      
Fair Value of Financial Instruments (Textual) [Abstract]      
Impaired Loans Categorized as Level 3 $ 4,100 $ 4,600