Transactions with Related Parties Acquisition Fees (Details) (USD $)	3 Months Ended	9 Months Ended		3 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2013 Public housing capital fund trusts [Member]	Sep. 30, 2012 Arbors at Hickory Ridge [Member] Tax-exempt mortgage revenue bonds [Member]
Related Party Transaction [Line Items]
Fees and Commissions, Other	$ 338,000	$ 1	$ 653,000	$ 100,000