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Commitments and Off-Balance Sheet Risk (Details Textual) (USD $)
In Millions, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Commitments and Off-Balance Sheet Risk (Additional Textual) [Abstract]      
Reserve or liability balance for financial instruments with off-balance sheet risk $ 0    
Provision for loan losses expended for financial instruments with off-balance sheet risk 0.5 0.4  
Loan loss reserve for off balance sheet activities   0.4  
Notional amount of the underlying interest rate swap agreements entered into by commercial loan customers with correspondent banks 30.0   100.0
Net fair value of interest rate swaps entered into by commercial loan customer's with correspondent banks $ (4.4)    
Maximum [Member]
     
Commitments and Off-Balance Sheet Risk (Textual) [Abstract]      
Fees accreted into income during interest rate swap agreements years 15 years    
Minimum [Member]
     
Commitments and Off-Balance Sheet Risk (Textual) [Abstract]      
Fees accreted into income during interest rate swap agreements years 4 years