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Indebtedness (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2005 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2004
Maximum borrowing percentage |  | 10.00% |  |
Borrowing threshold of FHLBI |  | 20 |  |
Debt Issuance Costs, Gross |  | $ 3,300 |  |
Long-term debt |  | 550,743 | $ 550,597 |
Selective Insurance Group [Member] |  |  |  |
Line of Credit, Current |  | $ 50,000 |  |
Line of Credit Facility, Interest Rate at Period End |  | 2.244% |  |
Five Point Three Hundred Seventy Five [Member] |  |  |  |
Long-term Debt, Gross |  | $ 300,000 |  |
Interest Rate |  | 5.375% |  |
Discount for notes issued |  | $ 5,900 |  |
Net proceeds from the issuance |  | 290,800 |  |
Five Point Eight Hundred Seventy Five Percent Senior Notes [Member] |  |  |  |
Long-term Debt, Gross |  | $ 185,000 |  |
Interest Rate |  | 5.875% |  |
Debt Retirement Costs Before Tax |  | $ 4,200 |  |
Debt Retirement Costs Net of Tax |  | 3,300 |  |
Proceeds From Debt Issuance After Redemption |  | 106,000 |  |
Three Point Zero Three Percent Borrowing From Federal Home Loan Bank Due December 16, 2026 [Member] |  |  |  |
Long-term Debt, Gross |  | $ 60,000 |  |
Interest Rate |  | 3.03% |  |
Federal Home Loan Bank Advances |  |  | 45,000 |
Net proceeds from the issuance |  |  | 15,000 |
Six Point Seventy Percent Senior Notes due 2035 [Member] |  |  |  |
Long-term Debt, Gross |  | $ 100,000 |  |
Interest Rate |  | 6.70% |  |
Acceleration of principal |  | $ 10,000 |  |
Discount for notes issued | $ 700 |  |  |
Effective yield | 6.754% |  |  |
Net proceeds from the issuance | $ 50,000 |  |  |
Seven Point Twenty Five Percent Senior Notes due 2034 [Member] |  |  |  |
Long-term Debt, Gross |  | $ 50,000 |  |
Interest Rate |  | 7.25% |  |
Acceleration of principal |  | $ 10,000 |  |
Discount for notes issued |  |  |  | $ 100
Effective yield |  |  |  | 7.27%
Bond proceeds to Insurance Subsidiaries as capital |  |  |  | $ 25,000
Line of Credit expires Dec.20, 2022 [Member] |  |  |  |
Line of credit borrowing capacity |  | 50,000 | 30,000 |
Line of credit, maximum borrowing capacity |  | 125,000 | 50,000 |
Acceleration of principal |  | $ 20,000 |  |
Maximum borrowing percentage |  | 10.00% |  |
One Point Sixty One Percent Borrowing From Federal Home Loan Bank Due July 21, 2021 [Member] |  |  |  |
Long-term Debt, Gross |  | $ 25,000 |  |
Interest Rate |  | 1.61% |  |
One Point Fifty Six Percent Borrowing From Federal Home Loan Bank Due August 16, 2021 [Member] |  |  |  |
Long-term Debt, Gross |  | $ 25,000 |  |
Interest Rate |  | 1.56% |  |
Zero Point Seventy Eight Percent Borrowing from FHLBNY Due September 14, 2020. [Member] |  |  |  |
Federal Home Loan Bank Advances |  | $ 100,000 |  |
Zero Point Seventy Eight Percent Borrowing from FHLBNY Due September 14, 2020. [Member] | Selective Insurace Company of America (SICA) [Member] |  |  |  |
Federal Home Loan Bank, Advances, Interest Rate |  | 0.78% |  |
Zero Point Thirty Six Percent Borrowing from FHLBNY Due November 16, 2020 [Member] | Selective Insurace Company of America (SICA) [Member] |  |  |  |
Federal Home Loan Bank, Advances, Interest Rate |  | 0.36% |  |
Zero Point Sixty Eight Percent Borrowing from FHLBNY Due September 18, 2020 [Member] | Selective Insurace Company of America (SICA) [Member] |  |  |  |
Federal Home Loan Bank, Advances, Interest Rate |  | 0.68% |  |
Zero Point Thirty Three Percent Borrowing from FHLBNY Due December 16, 2020 [Member] | Selective Insurace Company of America (SICA) [Member] |  |  |  |
Federal Home Loan Bank, Advances, Interest Rate |  | 0.33% |  |
One Point Eighty One Percent Borrowing From Federal Home Loan Bank Due February 18, 2020 [Member] |  |  |  |
Federal Home Loan Bank Advances |  | $ 85,000 |  |
Federal Home Loan Bank, Advances, Interest Rate |  | 1.81% |  |
Zero Point Fifty Eight Percent Borrowing from FHLBI Due December 14, 2020. [Member] | Selective Insurance Company of South Carolina (SICSC) [Member] |  |  |  |
Federal Home Loan Bank Advances |  | $ 39,000 |  |
Federal Home Loan Bank, Advances, Interest Rate |  | 0.58% |  |
Zero Point Fifty Eight Percent Borrowing from FHLBI Due December 14, 2020. [Member] | Selective Insurance Company of the Southeast (SICSE) [Member] |  |  |  |
Federal Home Loan Bank Advances |  | $ 28,000 |  |
Federal Home Loan Bank, Advances, Interest Rate |  | 0.58% |  |
Federal Home Loan Bank of Indianapolis [Member] |  |  |  |
Aggregate investment in FHLBI |  | $ 5,700 | $ 2,800 |
Federal Home Loan Bank of New York [Member] |  |  |  |
Aggregate investment in FHLBI |  | $ 3,100 |  |

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- Definition This amount is a multiple of the Company's aggregate investment in the Federal Home Loan Bank representing the Company's ability to borrow from the Federal Home Loan Bank. + References No definition available. + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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- Definition The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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