Debt (Trust Preferred Securities) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	0 Months Ended
Mar. 31, 2012 Trust Preferred Securities [Member] issues	Mar. 31, 2012 Mercer Insurance Group [Member]	Mar. 28, 2011 Mercer Insurance Group [Member] Trust Preferred Securities [Member] issues
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Number of issuances assumed with our acquisition of Mercer Insurance Group			3
Outstanding balance of the Trust Preferred Securities assumed with our acquisition of Mercer Insurance Group			$ 15,614
Number of debt securities redeemed during period	2
Value of debt securities redeemed during period	8,035
Interest expense, trust preferred securities		$ 151

The amount of interest incurred to a trust which has issued trust-preferred securities. In order to issue trust preferred securities, a sponsor forms a trust by investing a nominal amount of cash to purchase all of the voting common stock of the trust. The trust issues nonvoting, mandatorily redeemable preferred securities to outside investors in exchange for cash. The proceeds received from the issuance of the preferred securities, together with the cash received for issuing the common stock to the sponsor, is then loaned to the sponsor in exchange for a note which has the same terms as the trust preferred securities. Trust preferred securities possesses characteristics of both equity and debt issues and are generally issued by bank holding companies.

+ References+ Details

The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References+ Details