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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, 2021 | Dec. 31, 2020
Retained Earnings | $ 2,603,472 | $ 2,271,537
Ordinary dividends paid | 140,000 |
Insurance subsidiaries ability to provide annual dividends | $ 322,000 |
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 | $ 66,000 |
Insurance subsidiaries ability to provide annual dividends | 124,400 |
Selective Way Insurance Company (SWIC) [Member] |  |
Ordinary dividends paid | 27,500 |
Insurance subsidiaries ability to provide annual dividends | 72,800 |
Selective Insurance Company of South Carolina (SICSC) [Member] |  |
Ordinary dividends paid | 10,000 |
Insurance subsidiaries ability to provide annual dividends | 24,200 |
Selective Insurance Company of the Southeast (SICSE) [Member] |  |
Ordinary dividends paid | 8,800 |
Insurance subsidiaries ability to provide annual dividends | 19,400 |
Selective Insurance Company of New York (SICNY) [Member] |  |
Ordinary dividends paid | 4,000 |
Insurance subsidiaries ability to provide annual dividends | 15,500 |
Selective Insurance Company of New England (SICNE) [Member] |  |
Ordinary dividends paid | 3,000 |
Insurance subsidiaries ability to provide annual dividends | 7,500 |
Selective Auto Insurance Company of New Jersey (SAICNJ) [Member] |  |
Ordinary dividends paid | 700 |
Insurance subsidiaries ability to provide annual dividends | 16,800 |
Mesa Underwriting Specialty Insurance Company (MUSIC) [Member] |  |
Ordinary dividends paid | 6,100 |
Insurance subsidiaries ability to provide annual dividends | 13,700 |
Selective Casualty Insurance Company (SCIC) [Member] |  |
Ordinary dividends paid | 10,400 |
Insurance subsidiaries ability to provide annual dividends | 19,500 |
Selective Fire and Casualty Insurance Company (SFCIC) [Member] |  |
Ordinary dividends paid | 3,500 |
Insurance subsidiaries ability to provide annual dividends | 8,200 |
Parent Company [Member] |  |
Investments and Cash Available to fund future dividend and interest payments | 527,100 |
Retained Earnings | 2,600,000 |
Additional Borrowing Capacity for Parent | $ 109,900 |

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