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Statutory Financial Information, Capital Requirements, and Restrictions on Dividends and Transfers of Funds (Dividends) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Total stockholders’ equity | $ 1,791,802 | $ 1,712,957 | $ 1,531,370
Ordinary dividends paid | 100,100 |  |
Maximum ordinary dividends to be paid in the next fiscal year | $ 210,000 |  |
Maximum borrowing percentage | 10.00% |  |
New Jersey Dividend Restriction | 10.00% |  |
New York Dividend Restriction on Insurer's Statutory Surplus | 10.00% |  |
New York Dividend Restriction on Adjusted Net Investment Income | 100.00% |  |
Selective Insurace Company of America (SICA) [Member] |  |  |
Ordinary dividends paid | $ 43,000 |  |
Maximum ordinary dividends to be paid in the next fiscal year | 78,000 |  |
Selective Way Insurance Company (SWIC) [Member] |  |  |
Ordinary dividends paid | 19,000 |  |
Maximum ordinary dividends to be paid in the next fiscal year | 47,500 |  |
Selective Insurance Company of South Carolina (SICSC) [Member] |  |  |
Ordinary dividends paid | 10,000 |  |
Maximum ordinary dividends to be paid in the next fiscal year | 16,500 |  |
Selective Insurance Company of the Southeast (SICSE) [Member] |  |  |
Ordinary dividends paid | 7,500 |  |
Maximum ordinary dividends to be paid in the next fiscal year | 12,900 |  |
Selective Insurance Company of New York (SICNY) [Member] |  |  |
Ordinary dividends paid | 4,500 |  |
Maximum ordinary dividends to be paid in the next fiscal year | 11,400 |  |
Selective Insurance Company of New England (SICNE) [Member] |  |  |
Ordinary dividends paid | 2,000 |  |
Maximum ordinary dividends to be paid in the next fiscal year | 5,600 |  |
Selective Auto Insurance Company of New Jersey (SAICNJ) [Member] |  |  |
Ordinary dividends paid | 2,500 |  |
Maximum ordinary dividends to be paid in the next fiscal year | 9,900 |  |
Mesa Underwriting Specialty Insurance Company (MUSIC) [Member] |  |  |
Ordinary dividends paid | 7,100 |  |
Maximum ordinary dividends to be paid in the next fiscal year | 9,400 |  |
Selective Casualty Insurance Company (SCIC) [Member] |  |  |
Ordinary dividends paid | 3,000 |  |
Maximum ordinary dividends to be paid in the next fiscal year | 13,300 |  |
Selective Fire and Casualty Insurance Company (SFCIC) [Member] |  |  |
Ordinary dividends paid | 1,500 |  |
Maximum ordinary dividends to be paid in the next fiscal year | 5,500 |  |
Parent Company [Member] |  |  |
Total stockholders’ equity | 1,900,000 |  |
Maximum ordinary dividends to be paid in the next fiscal year | 146,000 |  |
Additional Borrowing Capacity for Parent | $ 70,500 |  |

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- Definition This element represents disclosure of the total aggregate cash dividends paid to the entity by consolidated subsidiaries, by unconsolidated subsidiaries, and by 50% or less owned persons accounted for using the equity method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(b)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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