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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, 2020 | Dec. 31, 2019
Retained Earnings | $ 2,271,537 | $ 2,080,529
Ordinary dividends paid | 105,000 |
Insurance subsidiaries ability to provide annual dividends | $ 241,000 |
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 | $ 46,600 |
Insurance subsidiaries ability to provide annual dividends | 81,800 |
Selective Way Insurance Company (SWIC) [Member] |  |
Ordinary dividends paid | 22,500 |
Insurance subsidiaries ability to provide annual dividends | 54,100 |
Selective Insurance Company of South Carolina (SICSC) [Member] |  |
Ordinary dividends paid | 7,500 |
Insurance subsidiaries ability to provide annual dividends | 20,800 |
Selective Insurance Company of the Southeast (SICSE) [Member] |  |
Ordinary dividends paid | 5,300 |
Insurance subsidiaries ability to provide annual dividends | 16,800 |
Selective Insurance Company of New York (SICNY) [Member] |  |
Ordinary dividends paid | 3,000 |
Insurance subsidiaries ability to provide annual dividends | 13,900 |
Selective Insurance Company of New England (SICNE) [Member] |  |
Ordinary dividends paid | 2,200 |
Insurance subsidiaries ability to provide annual dividends | 6,700 |
Selective Auto Insurance Company of New Jersey (SAICNJ) [Member] |  |
Ordinary dividends paid | 5,900 |
Insurance subsidiaries ability to provide annual dividends | 12,900 |
Mesa Underwriting Specialty Insurance Company (MUSIC) [Member] |  |
Ordinary dividends paid | 6,000 |
Insurance subsidiaries ability to provide annual dividends | 11,400 |
Selective Casualty Insurance Company (SCIC) [Member] |  |
Ordinary dividends paid | 5,200 |
Insurance subsidiaries ability to provide annual dividends | 16,200 |
Selective Fire and Casualty Insurance Company (SFCIC) [Member] |  |
Ordinary dividends paid | 800 |
Insurance subsidiaries ability to provide annual dividends | 6,400 |
Parent Company [Member] |  |
Investments and Cash Available to fund future dividend and interest payments | 490,200 |
Retained Earnings | 2,300,000 |
Additional Borrowing Capacity for Parent | $ 97,100 |

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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=120395691&loc=d3e24072-122690 + Details
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