Segment Information (Schedule of Additional Business Segment Information) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Assets	$ 849,201	$ 790,468
Standard Commercial Segment [Member]
Segment Reporting Information [Line Items]
Assets	152,043	145,162
Specialty Commercial Segment [Member]
Segment Reporting Information [Line Items]
Assets	491,206	432,208
Personal Segment [Member]
Segment Reporting Information [Line Items]
Assets	195,488	200,356
Corporate [Member]
Segment Reporting Information [Line Items]
Assets	$ 10,464	$ 12,742