REINSURANCE (Reinsurance Programs) (Details) (Property and Casualty Insurance [Member], USD $)	12 Months Ended															7 Months Ended						12 Months Ended
	Dec. 31, 2013 Casualty Excess of Loss [Member]	Dec. 31, 2012 Casualty Excess of Loss [Member]	Dec. 31, 2011 Casualty Excess of Loss [Member]	Dec. 31, 2013 Property Excess of Loss [Member]	Dec. 31, 2012 Property Excess of Loss [Member]	Dec. 31, 2011 Property Excess of Loss [Member]	Dec. 31, 2013 Surety Excess of Loss [Member]	Dec. 31, 2012 Surety Excess of Loss [Member]	Dec. 31, 2011 Surety Excess of Loss [Member]	Dec. 31, 2013 Property Catastrophe [Member]	Dec. 31, 2012 Property Catastrophe [Member]	Dec. 31, 2011 Property Catastrophe [Member]	Dec. 31, 2013 Boiler and Machinery [Member]	Dec. 31, 2012 Boiler and Machinery [Member]	Dec. 31, 2011 Boiler and Machinery [Member]	Jul. 31, 2011 Mercer Insurance Group [Member] Casualty Excess of Loss [Member]		Jul. 31, 2011 Mercer Insurance Group [Member] Property Excess of Loss [Member]		Jul. 31, 2011 Mercer Insurance Group [Member] Umbrella Excess of Loss [Member]		Dec. 31, 2012 Mercer Insurance Group [Member] Surety Excess of Loss [Member]	Dec. 31, 2011 Mercer Insurance Group [Member] Surety Excess of Loss [Member]	Dec. 31, 2011 Mercer Insurance Group [Member] Property Catastrophe [Member]
Reinsurance [Line Items]
Stated Retention	$ 2,000,000	$ 2,000,000	$ 2,000,000	$ 2,000,000	$ 2,000,000	$ 2,000,000	$ 1,500,000	$ 1,500,000	$ 1,500,000	$ 20,000,000	$ 20,000,000	$ 20,000,000				$ 1,000,000	[1]	$ 1,000,000	[1]	$ 1,000,000	[1]		$ 500,000	$ 5,000,000	[2]
Limits	40,000,000	40,000,000	40,000,000	15,000,000	15,000,000	15,000,000	28,000,000	28,000,000	28,000,000	200,000,000	200,000,000	200,000,000	50,000,000	50,000,000	50,000,000	5,000,000	[1]	10,000,000	[1]	11,000,000	[1]		4,500,000	55,000,000	[2]
Percentage of Coverage	100.00%	100.00%	100.00%	100.00%	100.00%	100.00%	91.00%	91.00%	91.00%	95.00%	95.00%	95.00%	100.00%	100.00%	100.00%	100.00%	[1]	100.00%	[1]				90.00%	100.00%	[2]
Reinsurance Coverage Amount	38,000,000	38,000,000	38,000,000	13,000,000	13,000,000	13,000,000	26,500,000	26,500,000	26,500,000	180,000,000	180,000,000	180,000,000	50,000,000	50,000,000	50,000,000	4,000,000	[1]	9,000,000	[1]				4,000,000	50,000,000	[2]
Percentage of Coverage, Part I																				75.00%	[1]
Coverage Amount, Part I																				1,000,000	[1]
Percentage of Coverage, Part II																				100.00%	[1]
Coverage Amount, Part II																				9,000,000	[1]
Deductible																						$ 500,000

[1] On August 1, 2011, Mercer Insurance Group’s reinsurance retention and limits were changed to match those of the Company.

[2] On January 1, 2012, Mercer Insurance Group’s catastrophe reinsurance programs were changed to match those of the Company.