Allowance for Loan Losses (Details Textual) (USD $)	3 Months Ended
	Mar. 31, 2013 Category	Mar. 31, 2013 Maximum [Member]	Mar. 31, 2013 Minimum [Member]	Mar. 31, 2013 Originated loans [Member]	Dec. 31, 2012 Originated loans [Member]	Mar. 31, 2013 PNCI loans [Member]	Dec. 31, 2012 PNCI loans [Member]
Allowance for Loan Losses (Textual) [Abstract]
Impaired TDR Loans				$ 51,458,000	$ 57,223,000	$ 954,000	$ 950,000
Additional funds in TDR				92,000	137,000
Obligations to lend additional fund on TDR						$ 0	$ 0
Period of collateral payment of loan		12 months	3 months
Allowance for Loan Losses (Additional Textual) [Abstract]
Number of categories occupied under commercial real estate loan	2