Segment Information (Schedule of Additional Business Segment Information) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Assets	$ 1,489,863	$ 1,553,598
Specialty Commercial Segment [Member]
Segment Reporting Information [Line Items]
Assets	1,105,918	1,163,947
Standard Commercial Segment [Member]
Segment Reporting Information [Line Items]
Assets	193,088	194,594
Personal Segment [Member]
Segment Reporting Information [Line Items]
Assets	125,340	128,165
Corporate [Member]
Segment Reporting Information [Line Items]
Assets	$ 65,517	$ 66,892