Loan Securitization/Sale Activities (Details) (USD $)	3 Months Ended	9 Months Ended			3 Months Ended	9 Months Ended	3 Months Ended
	Jun. 30, 2013	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 First Mortgages	Jun. 30, 2013 B Notes Senior participations loan	Sep. 30, 2013 A Notes First Mortgages	Sep. 30, 2013 Repurchase agreement	Jun. 30, 2013 Repurchase agreement
Loan Transfer Activities
Par value of loans held-for-sale, sold during period	$ 814,800,000	$ 363,700,000
Fair value of loans held-for-sale, sold during period	851,500,000	375,200,000
Amount repaid for outstanding balance							272,100,000	610,400,000
Face amount of mortgage loans sold				261,600,000		100,000,000
Numbers of loans sold					2
Aggregate proceeds from loans sold		95,000,000	35,738,000		95,000,000
Total proceeds from first mortgage loans				$ 52,900,000