Variable Interest Entities (VIE) (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2011	Dec. 31, 2009	Dec. 31, 2016
Variable Interest Entity [Line Items]
Long-term Debt	$ 120,929			$ 131,737
Payments to Acquire Businesses and Interest in Affiliates		$ 6,100	$ 6,100
VIE purpose	purchase the land and construct a 36-unit low income housing rental complex
Federal investment tax credits		$ 8,400
Change in federal investment tax credits	$ (100)
Federal investment tax credit duration		10 years
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Long-term Debt	30,900
Equity Method Investments	900
Ownership in Liberty Mews Limited Partnership			99.99%
VIE financing			$ 10,600
Construction and Development Costs			$ 10,600
Partnership total assets	$ 8,800