Reinsurance (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013
E&S Commercial [Member]
Retention for reinsurance losses	$ 1.0
Proportional reinsurance retention, percentage	10.00%
Concentration of ceded credit risk, percentage	100.00%
Concentration of ceded credit risk remaining, percentage	90.00%
Excess and Umbrella Business Unit [Member]
Proportional reinsurance retention, percentage	20.00%
Concentration of ceded credit risk, percentage	80.00%
Standard Commercial Segment [Member]
Proportional reinsurance cede risk, percentage	100.00%
Professional Liability [Member] | Prior to June 1, 2012 [Member]
Proportional reinsurance cede risk, percentage	40.00%
Proportional reinsurance retention, percentage	60.00%
Hallmark County Mutual [Member]
Proportional reinsurance retention, percentage	100.00%
Catastrophe [Member]
Retention for reinsurance losses	6.0
Catastrophe [Member] | All States [Member]
Retention for reinsurance losses	6.0
Reinsurers reimbursement, percentage	100.00%
Reinsurers reimbursement retention, maximum limit	29.0
Reinsurers reimbursement retention, aggregate limit	58.0
Commercial Property [Member]
Retention for reinsurance losses	1.0
Commercial property risk value	6.0
Reinsurers reimbursement retention for any one disaster occurrence	10.0
Reinsurers reimbursement retention for each disaster occurrence	5.0
Reinsurers reimbursement retention, aggregate limit	30.0
Commercial Liability Risk [Member]
Retention for reinsurance losses	1.0
Reinsurers reimbursement retention for each disaster occurrence	5.0
Workers Compensation Risks [Member]
Retention for reinsurance losses	1.0
Reinsurers reimbursement, percentage	100.00%
Reinsurers reimbursement retention for each disaster occurrence	14.0
Reinsurers reimbursement retention, maximum limit	10.0
Reinsurers reimbursement retention, aggregate limit	28.0
Liability Loss [Member]
Proportional reinsurance cede risk, percentage	80.00%
Personal Property [Member]
Proportional reinsurance cede risk, percentage	60.00%
Minimum [Member] | E&S Commercial [Member]
Retention for reinsurance losses	$ 1.0