Fair Value Measurements (Details) (Fair Value, Measurements, Recurring [Member])	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
Fair value of Mortgage Loan Held for Sale
Prepayment speed	10.00%	13.00%
Minimum [Member]
Fair value of Mortgage Loan Held for Sale
Discount Rate	7.00%	7.00%
Yield	3.00%	3.00%
Credit Loss (annualized)	7.00%	5.00%
Maximum [Member]
Fair value of Mortgage Loan Held for Sale
Discount Rate	10.00%	10.00%
Yield	8.00%	8.00%
Credit Loss (annualized)	32.00%	31.00%