Acquisition and related Goodwill and Intangibles (Details) (Transportation Specialty Insurance Agency [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Business Acquisition [Line Items]
Date of acquisition agreement	Oct. 31, 2008
Cash purchase price	$ 3,500
Recorded goodwill	3,152
Customer Relationships and Employment Agreements [Member]
Business Acquisition [Line Items]
Intangible assets included in other assets	179
Amortization of intangible assets	28	35	41
Accumulated amortization on intangible assets	$ 158	$ 130