Segment Information (Schedule of Segment Reporting Additional Information by Segment) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Assets	$ 1,162,460	$ 1,075,547
Specialty Commercial Segment [Member]
Assets	734,763	660,263
Standard Commercial Segment [Member]
Assets	164,295	156,722
Personal Segment [Member]
Assets	241,686	239,632
Corporate [Member]
Assets	21,716	18,930
Parent Company [Member]
Assets	$ 379,079	$ 374,160