Other Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Other Liabilities
Interest rate swap liability	$ (434)	$ 894
Other	517	758
Total	10,006	11,691
Pension plan
Other Liabilities
Pension and supplemental executive retirement plan liability	2,241	2,280
SERP
Other Liabilities
Pension and supplemental executive retirement plan liability	$ 7,682	$ 7,759