Repurchase Reserve Liability (Details) (USD $)	3 Months Ended	9 Months Ended	81 Months Ended
	Sep. 30, 2013 item	Sep. 30, 2013 item	Sep. 30, 2013 item	Dec. 31, 2012	Sep. 30, 2012
Repurchase Reserve Liability
Increase in repurchase reserve liability	$ 150,000
Number of investors notifying foreclosed loans	1
Number of investors	2
Numbers of loans foreclosed			15
Balance of foreclosed loans	1,500,000	1,500,000	1,500,000
Number of loans sold to the secondary market		3,100
Balance of loans sold to the secondary market	$ 323,000,000	$ 323,000,000	$ 323,000,000	$ 310,000,000	$ 307,000,000