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SCHEDULE IV - REINSURANCE (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]                      
Direct Premiums                 $ 342,656us-gaap_DirectPremiumsEarned $ 313,842us-gaap_DirectPremiumsEarned $ 287,982us-gaap_DirectPremiumsEarned
Ceded to Other Companies                 1,275us-gaap_CededPremiumsEarned 2,825us-gaap_CededPremiumsEarned 2,316us-gaap_CededPremiumsEarned
Assumed from Other Companies                 38,219us-gaap_AssumedPremiumsEarned 52,783us-gaap_AssumedPremiumsEarned 53,191us-gaap_AssumedPremiumsEarned
Net Amount 68,933us-gaap_PremiumsEarnedNet 65,947us-gaap_PremiumsEarnedNet 62,905us-gaap_PremiumsEarnedNet 63,842us-gaap_PremiumsEarnedNet 65,422us-gaap_PremiumsEarnedNet 64,448us-gaap_PremiumsEarnedNet 61,775us-gaap_PremiumsEarnedNet 61,098us-gaap_PremiumsEarnedNet 261,627us-gaap_PremiumsEarnedNet 252,743us-gaap_PremiumsEarnedNet 237,461us-gaap_PremiumsEarnedNet
Retrocessions associated with premiums assumed from other companies                 1,275bwinb_RetrocessionsAssociatedWithPremiumsAssumedFromOtherCompanies 2,825bwinb_RetrocessionsAssociatedWithPremiumsAssumedFromOtherCompanies 2,316bwinb_RetrocessionsAssociatedWithPremiumsAssumedFromOtherCompanies
Property and Casualty Insurance [Member]                      
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]                      
Direct Premiums                 342,656us-gaap_DirectPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
313,842us-gaap_DirectPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
287,982us-gaap_DirectPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Ceded to Other Companies                 119,248us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
113,882us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
103,712us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Assumed from Other Companies                 38,219us-gaap_AssumedPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
52,783us-gaap_AssumedPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
53,191us-gaap_AssumedPremiumsEarned
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Net Amount                 $ 261,627us-gaap_PremiumsEarnedNet
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
$ 252,743us-gaap_PremiumsEarnedNet
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
$ 237,461us-gaap_PremiumsEarnedNet
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
% of Amount Assumed to Net (in hundredths)                 14.10%us-gaap_PremiumsPercentageAssumedToNet
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
19.80%us-gaap_PremiumsPercentageAssumedToNet
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
21.40%us-gaap_PremiumsPercentageAssumedToNet
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember