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Fair Value Measurements (Carrying Value and Estimated Fair Value of Financial Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Held-to-maturity Securities $ 554,069 $ 712,348
Available-for-sale Securities, Debt Securities 3,296,013 2,897,373
Equity securities, AFS 151,382 157,355
Short-term investments 214,479 217,044
Notes payable 307,387 307,360
Carrying Amount [Member]
    
Held-to-maturity Securities 554,069 712,348
Available-for-sale Securities, Debt Securities 3,296,013 2,897,373
Equity securities, AFS 151,382 157,355
Short-term investments 214,479 217,044
Receivable for proceeds related to sale of Selective HR 2,705 3,212
Notes payable 307,387 307,360
Carrying Amount [Member] | Seven Point Twenty Five Percent Senior Notes [Member]
    
Notes payable 49,912 49,908
Carrying Amount [Member] | Six Point Seventy Percent Senior Notes [Member]
    
Notes payable 99,475 99,452
Carrying Amount [Member] | Seven Point Fifty Percent Junior Notes [Member]
    
Notes payable 100,000 100,000
Carrying Amount [Member] | Two Point Ninety Percent Borrowing From Federal Home Loan Bank [Member]
    
Notes payable 13,000 13,000
Carrying Amount [Member] | One Point Twenty Five Percent Borrowing From Federal Home Loan Bank [Member]
    
Notes payable 45,000 45,000
Fair Value [Member]
    
Held-to-maturity Securities 594,661 758,043
Available-for-sale Securities, Debt Securities 3,296,013 2,897,373
Equity securities, AFS 151,382 157,355
Short-term investments 214,479 217,044
Receivable for proceeds related to sale of Selective HR 2,705 3,212
Notes payable 321,061 323,054
Fair Value [Member] | Seven Point Twenty Five Percent Senior Notes [Member]
    
Notes payable 52,689 51,111
Fair Value [Member] | Six Point Seventy Percent Senior Notes [Member]
    
Notes payable 107,707 113,195
Fair Value [Member] | Seven Point Fifty Percent Junior Notes [Member]
    
Notes payable 101,480 100,360
Fair Value [Member] | Two Point Ninety Percent Borrowing From Federal Home Loan Bank [Member]
    
Notes payable 13,595 13,759
Fair Value [Member] | One Point Twenty Five Percent Borrowing From Federal Home Loan Bank [Member]
    
Notes payable $ 45,590 $ 44,629