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Reinsurance - Reinssurance Agreements (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Platinum Underwriters Reinsurance, Inc  
A.M. Best Rating A
Combined Retention (All 3 Reinsurers) $ 500,000UNAM_Retention
/ UNAM_ReinsuranceAgreementsAxis
= UNAM_PlatinumMember
Annual Aggregate Deductible 0UNAM_AnnualAggregateDeductible
/ UNAM_ReinsuranceAgreementsAxis
= UNAM_PlatinumMember
Hannover Ruckversicherungs AG  
A.M. Best Rating A+
Combined Retention (All 3 Reinsurers) 500,000UNAM_Retention
/ UNAM_ReinsuranceAgreementsAxis
= UNAM_HannoverMember
Annual Aggregate Deductible 0UNAM_AnnualAggregateDeductible
/ UNAM_ReinsuranceAgreementsAxis
= UNAM_HannoverMember
TOA Reinsurance  
A.M. Best Rating A+
Combined Retention (All 3 Reinsurers) 500,000UNAM_Retention
/ UNAM_ReinsuranceAgreementsAxis
= UNAM_TOAMember
Annual Aggregate Deductible $ 0UNAM_AnnualAggregateDeductible
/ UNAM_ReinsuranceAgreementsAxis
= UNAM_TOAMember