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Document and Entity Information
 9 Months Ended
Sep. 30, 2014
Document Information [Line Items]  
Document Type 10-Q
Amendment Flag false
Document Period End Date Sep. 30, 2014
Document Fiscal Year Focus 2014
Document Fiscal Period Focus Q3
Entity Registrant Name SELECTIVE INSURANCE GROUP INC
Entity Central Index Key 0000230557
Current Fiscal Year End Date --12-31
Entity Filer Category Large Accelerated Filer
Entity Common Stock , Shares Outstanding 56,424,220