Segment Information (Schedule of Segment Reporting Additional Information by Segment) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets	$ 1,264,894	$ 1,231,126
Specialty Commercial Segment Member
Assets	858,262	810,133
Standard Commercial Segment [Member]
Assets	158,881	162,152
Personal Segment [Member]
Assets	226,431	232,441
Corporate [Member]
Assets	21,320	26,400
Parent Company [Member]
Assets	$ 366,208	$ 364,818