Long-Term Debt (Details) (USD $)	12 Months Ended
	Dec. 31, 2011 Y	Dec. 31, 2010
Long-Term Debt
Long-Term Debt	$ 30,696,000	$ 32,652,000
Commercial and residential mortgage loans pledged to secure an undrawn FRB line of credit	1,100,000,000	1,100,000,000
Residential mortgage loans pledged under a blanket pledge arrangement to secure FHLB advance	1,300,000,000	1,200,000,000
Non recourse debt
Long-Term Debt
Long-Term Debt	21,787,000	23,707,000
Stated fixed interest rate (as a percent)	6.30%
Capital lease obligations
Long-Term Debt
Long-Term Debt	8,909,000	8,945,000
Lease term (in years)	60
Fixed lease payments through December 2012	700,000
Federal Home Loan Bank advances
Long-Term Debt
Maximum percentage of the total assets that can be borrowed by the entity	15.00%
Undrawn line of credit	947,400,000
Residential mortgage loans pledged under a blanket pledge arrangement to secure FHLB advance	1,300,000,000
Federal Reserve Bank advances
Long-Term Debt
Commercial and residential mortgage loans pledged to secure an undrawn FRB line of credit	1,100,000,000
Undrawn line of credit	$ 709,700,000