Significant Accounting Policies, Accounting Changes (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2018
Assets and Liabilities, Lessee [Abstract]
Operating lease right-of-use asset	$ 4,810	$ 4,550
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]			us-gaap:OtherAssets
Operating lease liability	$ 4,872	$ 4,560
Operating Lease, Liability, Statement of Financial Position [Extensible List]			us-gaap:OtherLiabilities
ASU 2016-02 [Member]
Assets and Liabilities, Lessee [Abstract]
Operating lease right-of-use asset			$ 4,730
Operating lease liability			$ 4,730