Investment in Real Estate Limited Partnerships Narrative Data (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Investment Holdings [Line Items]
Investment in real estate limited partnerships	$ 2,373,000	$ 2,824,000
Capital contributions payable for limited partnership investments	0	151,000
Equity in losses of limited partnerships	484,000	800,000	$ 690,000
Losses from the exit of investments in real estate limited partnerships		144,000
Tax credits for investments in real estate limited partnership	$ 564,000	$ 735,000	$ 675,000