Loans, Allowance for Loan Losses, and Credit Quality (Details Textuals) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Loans Allowance for Loan Losses and Credit Quality Disclosure (Textuals) [Abstract]
Interest income recognized on accruing restructured loans	$ 5,000,000	$ 6,000,000
Restructured Loans Subsequently Accruing	25,000,000
Performing Restructured Loans	135,791,000	113,164,000
Nonaccrual Restructured Loans	74,251,000	87,493,000
YTD restructured loans still on nonaccrual	$ 21,000,000