Segment Information (Schedule of Additional Business Segment Information) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Assets	$ 879,717	$ 790,468
Standard Commercial Segment [Member]
Segment Reporting Information [Line Items]
Assets	144,231	145,162
Specialty Commercial Segment [Member]
Segment Reporting Information [Line Items]
Assets	526,160	432,208
Personal Segment [Member]
Segment Reporting Information [Line Items]
Assets	192,588	200,356
Corporate [Member]
Segment Reporting Information [Line Items]
Assets	$ 16,738	$ 12,742