Segment Information (Schedule of Additional Business Segment Information) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Assets	$ 1,405,768	$ 1,264,894
Specialty Commercial Segment [Member]
Segment Reporting Information [Line Items]
Assets	1,005,810	858,262
Standard Commercial Segment [Member]
Segment Reporting Information [Line Items]
Assets	184,101	158,881
Personal Segment [Member]
Segment Reporting Information [Line Items]
Assets	170,348	226,431
Corporate [Member]
Segment Reporting Information [Line Items]
Assets	$ 45,509	$ 21,320