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Statutory Financial Information, Capital Requirements, and Restrictions on Dividends and Transfers of Funds (Dividends) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Total stockholders’ equity $ 1,531,370,000 $ 1,398,041,000 $ 1,275,586,000
Ordinary dividends paid 61,000,000    
Maximum ordinary dividends $ 192,700,000    
Maximum borrowing percentage 10.00%    
New Jersey Dividend Restriction 10.00%    
New York Dividend Restriction 10.00%    
Dividend Restriction New York 100.00%    
Selective Insurace Company of America (SICA) [Member]      
Ordinary dividends paid $ 26,000,000    
Maximum ordinary dividends 72,200,000    
Selective Way Insurance Company (SWIC) [Member]      
Ordinary dividends paid 12,000,000    
Maximum ordinary dividends 40,400,000    
Selective Insurance Company of South Carolina (SICSC) [Member]      
Ordinary dividends paid 5,000,000    
Maximum ordinary dividends 13,800,000    
Selective Insurance Company of the Southeast (SICSE) [Member]      
Ordinary dividends paid 2,000,000    
Maximum ordinary dividends 10,900,000    
Selective Insurance Company of New York (SICNY) [Member]      
Ordinary dividends paid 5,000,000    
Maximum ordinary dividends 10,200,000    
Selective Insurance Company of New England (SICNE) [Member]      
Ordinary dividends paid 2,000,000    
Maximum ordinary dividends 5,900,000    
Selective Auto Insurance Company of New Jersey (SAICNJ) [Member]      
Ordinary dividends paid 1,500,000    
Maximum ordinary dividends 11,500,000    
Mesa Underwriting Specialty Insurance Company (MUSIC) [Member]      
Maximum ordinary dividends 9,700,000    
Selective Casualty Insurance Company (SCIC) [Member]      
Ordinary dividends paid 5,500,000    
Maximum ordinary dividends 12,600,000    
Selective Fire and Casualty Insurance Company (SFCIC) [Member]      
Ordinary dividends paid 2,000,000    
Maximum ordinary dividends 5,500,000    
Parent Company [Member]      
Total stockholders’ equity 1,500,000,000    
Maximum ordinary dividends 91,700,000    
Additional Borrowing Capacity for Parent $ 68,600,000