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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, 2023 | Dec. 31, 2022
Retained Earnings | $ 3,029,396 | $ 2,749,703
Ordinary dividends paid | 80,000 |
Maximum Ordinary Dividends | $ 316,200 |
Maximum borrowing percentage | 10.00% |
New Jersey Dividend Restriction on Insurer's Statutory Surplus | 10.00% |
New York Dividend Restriction on Insurer's Statutory Surplus | 10.00% |
New York Dividend Restriction on Adjusted Net Investment Income | 100.00% |
Parent Company [Member] |  |
Investments and Cash | $ 508,000 |
Retained Earnings | 3,029,396 | $ 2,749,703
Selective Insurace Company of America (SICA) [Member] |  |
Ordinary dividends paid | 41,500 |
Maximum Ordinary Dividends | 117,700 |
Selective Way Insurance Company (SWIC) [Member] |  |
Ordinary dividends paid | 16,300 |
Maximum Ordinary Dividends | 62,400 |
Selective Insurance Company of South Carolina (SICSC) [Member] |  |
Ordinary dividends paid | 3,800 |
Maximum Ordinary Dividends | 26,000 |
Selective Insurance Company of the Southeast (SICSE) [Member] |  |
Ordinary dividends paid | 4,400 |
Maximum Ordinary Dividends | 21,600 |
Selective Insurance Company of New York (SICNY) [Member] |  |
Ordinary dividends paid | 2,000 |
Maximum Ordinary Dividends | 18,000 |
Selective Insurance Company of New England (SICNE) [Member] |  |
Ordinary dividends paid | 1,000 |
Maximum Ordinary Dividends | 8,100 |
Selective Auto Insurance Company of New Jersey (SAICNJ) [Member] |  |
Ordinary dividends paid | 800 |
Maximum Ordinary Dividends | 16,400 |
Mesa Underwriting Specialty Insurance Company (MUSIC) [Member] |  |
Ordinary dividends paid | 3,500 |
Maximum Ordinary Dividends | 14,300 |
Selective Casualty Insurance Company (SCIC) [Member] |  |
Ordinary dividends paid | 5,200 |
Maximum Ordinary Dividends | 24,000 |
Selective Fire and Casualty Insurance Company (SFCIC) [Member] |  |
Ordinary dividends paid | 1,500 |
Maximum Ordinary Dividends | 7,700 |
Parent Company [Member] |  |
Retained Earnings | 3,000,000 |
Additional Borrowing Capacity for Parent | $ 114,500 |

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