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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, 2019 | Dec. 31, 2018
Retained Earnings | $ 2,080,529 | $ 1,858,414
Ordinary dividends paid | 110,000 |
Investments and cash available to fund future dividends and interest payments | $ 266,700 |
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 | $ 55,500 |
Investments and cash available to fund future dividends and interest payments | 98,400 |
Selective Way Insurance Company (SWIC) [Member] |  |
Ordinary dividends paid | 19,000 |
Investments and cash available to fund future dividends and interest payments | 53,700 |
Selective Insurance Company of South Carolina (SICSC) [Member] |  |
Ordinary dividends paid | 9,500 |
Investments and cash available to fund future dividends and interest payments | 23,900 |
Selective Insurance Company of the Southeast (SICSE) [Member] |  |
Ordinary dividends paid | 6,700 |
Investments and cash available to fund future dividends and interest payments | 18,600 |
Selective Insurance Company of New York (SICNY) [Member] |  |
Ordinary dividends paid | 3,300 |
Investments and cash available to fund future dividends and interest payments | 12,700 |
Selective Insurance Company of New England (SICNE) [Member] |  |
Ordinary dividends paid | 2,000 |
Investments and cash available to fund future dividends and interest payments | 7,600 |
Selective Auto Insurance Company of New Jersey (SAICNJ) [Member] |  |
Ordinary dividends paid | 1,500 |
Investments and cash available to fund future dividends and interest payments | 14,700 |
Mesa Underwriting Specialty Insurance Company (MUSIC) [Member] |  |
Ordinary dividends paid | 8,000 |
Investments and cash available to fund future dividends and interest payments | 12,900 |
Selective Casualty Insurance Company (SCIC) [Member] |  |
Ordinary dividends paid | 3,000 |
Investments and cash available to fund future dividends and interest payments | 16,800 |
Selective Fire and Casualty Insurance Company (SFCIC) [Member] |  |
Ordinary dividends paid | 1,500 |
Investments and cash available to fund future dividends and interest payments | 7,400 |
Parent Company [Member] |  |
Assets Designated to Closed Block, Cash and Cash Equivalents | 278,000 |
Retained Earnings | 2,100,000 |
Additional Borrowing Capacity for Parent | $ 89,400 |

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