Loans, Allowance for Loan Losses, and Credit Quality (Details Textuals) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Loans Allowance for Loan Losses and Credit Quality Disclosure (Textuals) [Abstract]
Write down on installment loans transferred to held for sale	$ 10,000
Interest income recognized on accruing restructured loans		6,000,000	4,000,000
Restructured Loans Still Accruing		36,000,000	8,000,000
Restructured Loans Subsequently Accruing		77,000,000	72,000,000
Performing Restructured Loans		113,164,000	79,935,000
Nonaccrual Restructured Loans		87,493,000	35,939,000
Average Recorded Investment Impaired Loans				687,000,000
Cash Basis Interest Income Impaired Loans				$ 41,000,000