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DEBT (Trust Preferred Securities) (Details) (Mercer Insurance Group [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended 0 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Mar. 28, 2011
Trust Preferred Securities [Member]
issues
Financial Instruments Subject to Mandatory Redemption by Settlement [Line Items]      
Number of issuances of securities assumed with acquisition     3
Outstanding balance of the securities assumed with acquisition     $ 15,614
Interest expense, trust preferred securities $ 509 $ 1,055