Segment Information (Schedule of Business Segment Information) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues [Abstract]
Revenues	$ 98,125	$ 93,475	$ 191,466	$ 190,423
Pre-tax income (loss) [Abstract]
Pre-tax income (loss)	6,372	(4,918)	7,181	920
Specialty Commercial Segment [Member]
Revenues [Abstract]
Revenues	72,081	69,501	145,205	135,336
Pre-tax income (loss) [Abstract]
Pre-tax income (loss)	8,770	3,632	18,528	11,730
Standard Commercial Segment [Member]
Revenues [Abstract]
Revenues	19,247	17,322	38,122	35,048
Pre-tax income (loss) [Abstract]
Pre-tax income (loss)	2,656	(199)	3,975	652
Personal Segment [Member]
Revenues [Abstract]
Revenues	7,916	10,684	15,536	22,547
Pre-tax income (loss) [Abstract]
Pre-tax income (loss)	(1)	(892)	(23)	(1,650)
Corporate [Member]
Revenues [Abstract]
Revenues	(1,119)	(4,032)	(7,397)	(2,508)
Pre-tax income (loss) [Abstract]
Pre-tax income (loss)	$ (5,053)	$ (7,459)	$ (15,299)	$ (9,812)