Segment Information (Schedule of Business Segment Information) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues [Abstract]
Revenues	$ 102,946	$ 97,723	$ 294,412	$ 288,146
Pre-tax income (loss) [Abstract]
Pre-tax income (loss)	12,075	(1,525)	19,256	(605)
Specialty Commercial Segment [Member]
Revenues [Abstract]
Revenues	68,302	69,721	213,507	205,057
Pre-tax income (loss) [Abstract]
Pre-tax income (loss)	2,452	1,288	20,980	13,018
Standard Commercial Segment [Member]
Revenues [Abstract]
Revenues	19,857	17,401	57,979	52,449
Pre-tax income (loss) [Abstract]
Pre-tax income (loss)	7,264	229	11,239	881
Personal Segment [Member]
Revenues [Abstract]
Revenues	9,355	9,404	24,891	31,951
Pre-tax income (loss) [Abstract]
Pre-tax income (loss)	684	(661)	661	(2,311)
Corporate [Member]
Revenues [Abstract]
Revenues	5,432	1,197	(1,965)	(1,311)
Pre-tax income (loss) [Abstract]
Pre-tax income (loss)	$ 1,675	$ (2,381)	$ (13,624)	$ (12,193)