Impaired Loans and Valuation Allowance for Loan Losses (Details Textual) (USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Impaired Loans and Valuation Allowance for Loan Losses (Textual) [Abstract]
Newly identified TDRs	$ 5,700,000
Impaired Loans and Valuation Allowance for Loan Losses (Additional Textual) [Abstract]
Loan default period	60 days
Accruing TDRs	29,600,000		41,900,000
Interest income on impaired loans	669,000	1,709,000
Expected future cash flows of impaired loans	799,000	518,000
Commercial real estate [Member]
Impaired Loans and Valuation Allowance for Loan Losses (Textual) [Abstract]
Newly identified TDRs	1,000,000
Residential real estate [Member]
Impaired Loans and Valuation Allowance for Loan Losses (Textual) [Abstract]
Newly identified TDRs	900,000
Consumer [Member]
Impaired Loans and Valuation Allowance for Loan Losses (Textual) [Abstract]
Newly identified TDRs	$ 100,000