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Fair Value Measurements (Quantitative Disclosures of Fair Value Assets) (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Available-for-sale Secuities | $ 3,419,811 |  | $ 3,296,013 |
Equity securities, AFS | 172,064 |  | 151,382 |
Short-term investments | 186,499 |  | 214,479 |
Held-to-maturity Securities | 479,507 |  | 554,069 |
Fair Value [Member] |  |  |  |
Held-to-maturity Securities | 507,290 |  | 594,661 |
Fair Value [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Secuities | 3,419,811 |  | 3,296,013 |
Equity securities, AFS | 172,064 |  | 151,382 |
Short-term investments | 186,499 |  | 214,479 |
Receivable for proceeds related to sale of Selective HR |  |  | 2,705 |
Total assets | 3,778,709 |  | 3,664,579 |
Fair Value [Member] | US Government and Government Agencies and Authorities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Secuities | 177,994 |  | 259,092 |
Fair Value [Member] | Foreign Government [Member] |  |  |  |
Held-to-maturity Securities | 5,658 |  | 5,871 |
Fair Value [Member] | Foreign Government [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Secuities | 29,670 |  | 30,229 |
Fair Value [Member] | Obligations of States and Political Subdivisions [Member] |  |  |  |
Held-to-maturity Securities | 446,893 |  | 526,922 |
Fair Value [Member] | Obligations of States and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Secuities | 894,318 |  | 818,024 |
Fair Value [Member] | Corporate Securities [Member] |  |  |  |
Held-to-maturity Securities | 38,881 |  | 42,121 |
Fair Value [Member] | Corporate Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Secuities | 1,523,971 |  | 1,450,247 |
Fair Value [Member] | Asset-backed Securities [Member] |  |  |  |
Held-to-maturity Securities | 6,245 |  | 7,097 |
Fair Value [Member] | Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Secuities | 155,426 |  | 128,640 |
Fair Value [Member] | Asset-backed Securities [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Held-to-maturity Securities | 335 |  |  |
Fair Value [Member] | Commercial Mortgage-backed Securities ("CMBS") [Member] |  |  |  |
Held-to-maturity Securities | 9,613 |  | 12,650 |
Fair Value [Member] | Commercial Mortgage-backed Securities ("CMBS") [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Secuities | 135,584 |  | 137,119 |
Fair Value [Member] | Residential Mortgage Backed Securities ("RMBS") [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Secuities | 502,848 |  | 472,662 |
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] |  |  |  |
Held-to-maturity Securities | 0 |  | 0 |
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Secuities | 48,236 | [1] | 115,861 | [1]
Equity securities, AFS | 169,164 | [1] | 147,775 | [1]
Short-term investments | 186,499 | [1] | 214,479 | [1]
Receivable for proceeds related to sale of Selective HR |  |  | 0 | [1]
Total assets | 403,899 | [1] | 478,115 | [1]
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | US Government and Government Agencies and Authorities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Secuities | 48,236 | [1] | 115,861 | [1]
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Foreign Government [Member] |  |  |  |
Held-to-maturity Securities | 0 |  | 0 |
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Foreign Government [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Secuities | 0 | [1] | 0 | [1]
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Obligations of States and Political Subdivisions [Member] |  |  |  |
Held-to-maturity Securities | 0 |  | 0 |
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Obligations of States and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Secuities | 0 | [1] | 0 | [1]
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Corporate Securities [Member] |  |  |  |
Held-to-maturity Securities | 0 |  | 0 |
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Corporate Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Secuities | 0 | [1] | 0 | [1]
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Asset-backed Securities [Member] |  |  |  |
Held-to-maturity Securities | 0 |  | 0 |
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Secuities | 0 | [1] | 0 | [1]
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Asset-backed Securities [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Held-to-maturity Securities | 0 |  |  |
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Commercial Mortgage-backed Securities ("CMBS") [Member] |  |  |  |
Held-to-maturity Securities | 0 |  | 0 |
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Commercial Mortgage-backed Securities ("CMBS") [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Secuities | 0 | [1] | 0 | [1]
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Residential Mortgage Backed Securities ("RMBS") [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Secuities | 0 | [1] | 0 | [1]
Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Held-to-maturity Securities | 506,094 |  | 588,430 |
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Secuities | 3,369,944 | [1] | 3,144,187 | [1]
Equity securities, AFS | 0 | [1] | 0 | [1]
Short-term investments | 0 | [1] | 0 | [1]
Receivable for proceeds related to sale of Selective HR |  |  | 0 | [1]
Total assets | 3,370,279 | [1] | 3,144,187 | [1]
Significant Other Observable Inputs (Level 2) [Member] | US Government and Government Agencies and Authorities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Secuities | 129,758 | [1] | 123,442 | [1]
Significant Other Observable Inputs (Level 2) [Member] | Foreign Government [Member] |  |  |  |
Held-to-maturity Securities | 5,658 |  | 5,871 |
Significant Other Observable Inputs (Level 2) [Member] | Foreign Government [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Secuities | 29,670 | [1] | 30,229 | [1]
Significant Other Observable Inputs (Level 2) [Member] | Obligations of States and Political Subdivisions [Member] |  |  |  |
Held-to-maturity Securities | 446,893 |  | 526,922 |
Significant Other Observable Inputs (Level 2) [Member] | Obligations of States and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Secuities | 894,318 | [1] | 818,024 | [1]
Significant Other Observable Inputs (Level 2) [Member] | Corporate Securities [Member] |  |  |  |
Held-to-maturity Securities | 38,881 |  | 37,289 |
Significant Other Observable Inputs (Level 2) [Member] | Corporate Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Secuities | 1,523,971 | [1] | 1,447,301 | [1]
Significant Other Observable Inputs (Level 2) [Member] | Asset-backed Securities [Member] |  |  |  |
Held-to-maturity Securities | 5,049 |  | 5,698 |
Significant Other Observable Inputs (Level 2) [Member] | Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Secuities | 155,426 | [1] | 122,572 | [1]
Significant Other Observable Inputs (Level 2) [Member] | Asset-backed Securities [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Held-to-maturity Securities | 335 |  |  |
Significant Other Observable Inputs (Level 2) [Member] | Commercial Mortgage-backed Securities ("CMBS") [Member] |  |  |  |
Held-to-maturity Securities | 9,613 |  | 12,650 |
Significant Other Observable Inputs (Level 2) [Member] | Commercial Mortgage-backed Securities ("CMBS") [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Secuities | 133,953 | [1] | 129,957 | [1]
Significant Other Observable Inputs (Level 2) [Member] | Residential Mortgage Backed Securities ("RMBS") [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Secuities | 502,848 | [1] | 472,662 | [1]
Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Held-to-maturity Securities | 1,196 |  | 6,231 |
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Secuities | 1,631 |  | 35,965 |
Equity securities, AFS | 2,900 |  | 3,607 |
Short-term investments | 0 |  | 0 |
Receivable for proceeds related to sale of Selective HR |  |  | 2,705 |
Total assets | 4,531 |  | 42,277 |
Significant Unobservable Inputs (Level 3) [Member] | US Government and Government Agencies and Authorities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Secuities | 0 |  | 19,789 |
Significant Unobservable Inputs (Level 3) [Member] | Foreign Government [Member] |  |  |  |
Held-to-maturity Securities | 0 |  | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Foreign Government [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Secuities | 0 |  | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Obligations of States and Political Subdivisions [Member] |  |  |  |
Held-to-maturity Securities | 0 |  | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Obligations of States and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Secuities | 0 |  | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Corporate Securities [Member] |  |  |  |
Held-to-maturity Securities | 0 |  | 4,832 |
Significant Unobservable Inputs (Level 3) [Member] | Corporate Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Secuities | 0 |  | 2,946 |
Significant Unobservable Inputs (Level 3) [Member] | Asset-backed Securities [Member] |  |  |  |
Held-to-maturity Securities | 1,196 |  | 1,399 |
Significant Unobservable Inputs (Level 3) [Member] | Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Secuities | 0 |  | 6,068 |
Significant Unobservable Inputs (Level 3) [Member] | Asset-backed Securities [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Held-to-maturity Securities | 0 |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Commercial Mortgage-backed Securities ("CMBS") [Member] |  |  |  |
Held-to-maturity Securities | 0 |  | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Commercial Mortgage-backed Securities ("CMBS") [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Secuities | 1,631 |  | 7,162 |
Significant Unobservable Inputs (Level 3) [Member] | Residential Mortgage Backed Securities ("RMBS") [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Available-for-sale Secuities | $ 0 |  | $ 0 |
[1] | 1 There were no transfers of securities between Level 1 and Level 2.

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- Definition Other investments not otherwise specified in the taxonomy that will be realized in a short period of time, usually less than one year or the normal operating cycle, whichever is longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Section 563c.102 -Chapter V -Subsection I -LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.5) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(g)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 5 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph g -Article 7 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant