Income Tax Expense (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) Partnership	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($) Partnership
Income Tax Expense [Abstract]
Investments in number of partnerships | Partnership			4		4
Investment amount in partnerships	$ 829,000		$ 829,000		$ 959,000
Investment Tax Credit Carryforward [Member]
Tax Credit Carryforward [Line Items]
Investment tax credits	945,000		$ 945,000
Tax credits recognition period			6 years 4 months 24 days
Tax credits recognized as reduction of tax expense amount	$ 49,000	$ 49,000	$ 99,000	$ 99,000