Segment Information (Schedule of Additional Business Segment Information) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Assets	$ 1,434,396	$ 1,495,274
Specialty Commercial Segment [Member]
Segment Reporting Information [Line Items]
Assets	1,032,979	1,082,804
Standard Commercial Segment [Member]
Segment Reporting Information [Line Items]
Assets	185,933	193,710
Personal Segment [Member]
Segment Reporting Information [Line Items]
Assets	153,259	164,685
Corporate [Member]
Segment Reporting Information [Line Items]
Assets	$ 62,225	$ 54,075