Segment Information (Schedule of Additional Business Segment Information) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Assets	$ 1,553,598	$ 1,496,717
Specialty Commercial Segment [Member]
Segment Reporting Information [Line Items]
Assets	1,163,947	1,116,137
Standard Commercial Segment [Member]
Segment Reporting Information [Line Items]
Assets	194,594	183,689
Personal Segment [Member]
Segment Reporting Information [Line Items]
Assets	128,165	133,310
Corporate [Member]
Segment Reporting Information [Line Items]
Assets	$ 66,892	$ 63,581