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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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