Segment Information (Schedule of Additional Business Segment Information) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Assets	$ 1,048,660	$ 980,869
Standard Commercial Segment [Member]
Segment Reporting Information [Line Items]
Assets	153,606	145,355
Specialty Commercial Segment [Member]
Segment Reporting Information [Line Items]
Assets	637,729	590,852
Personal Segment [Member]
Segment Reporting Information [Line Items]
Assets	236,218	222,183
Corporate [Member]
Segment Reporting Information [Line Items]
Assets	$ 21,107	$ 22,479