Segment Information (Schedule of Additional Business Segment Information) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Assets	$ 1,495,274	$ 1,264,894
Specialty Commercial Segment [Member]
Segment Reporting Information [Line Items]
Assets	1,082,804	858,262
Standard Commercial Segment [Member]
Segment Reporting Information [Line Items]
Assets	193,710	158,881
Personal Segment [Member]
Segment Reporting Information [Line Items]
Assets	164,685	226,431
Corporate [Member]
Segment Reporting Information [Line Items]
Assets	$ 54,075	$ 21,320