Income Taxes-Components of Income Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2018	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Current Federal Tax Expense (Benefit)									$ 174	$ 0
Deferred Federal Income Tax Expense (Benefit)									(340)	0
Total Federal Income Tax Expense (Benefit)									(166)	0
Current State and Local Tax Expense									133	119
Income tax (benefit) expense	$ (124)	$ 31	$ 30	$ 30	$ 82	$ 0	$ 0	$ 37	$ (33)	$ 119