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Fair Value Measurements (Changes in Fair Value of Securities Using Level 3 Inputs) (Details) (USD $)
 9 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, Beginning balance $ 27,910,000 $ 5,187,000
Total net (losses) gains for the period included in OCI 779,000 [1] 507,000 [2]
Total net (losses) gains for the period included in net income 42,000 [3],[4] (960,000) [5],[6]
Purchases 12,910,000 0
Sales 0 0
Issuances 0 0
Settlements (2,989,000) (1,168,000)
Transfers into Level 3 12,642,000 24,344,000
Transfers out of Level 3 0 0
Fair value, Ending balance 51,294,000 27,910,000
Increase/decrease of receivable if retention assumption changed by +/- 10% 100,000  
Equity Securities [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, Beginning balance 0  
Total net (losses) gains for the period included in OCI 0 [1]  
Total net (losses) gains for the period included in net income 0 [3],[4]  
Purchases 0  
Sales 0  
Issuances 0  
Settlements 0  
Transfers into Level 3 3,607,000  
Transfers out of Level 3 0  
Fair value, Ending balance 3,607,000  
AFS Fixed Maturity Securities [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, Ending balance 44,900,000  
AFS Fixed Maturity Securities [Member] | U.S. Government and Government Agencies [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, Beginning balance 21,741,000 0
Total net (losses) gains for the period included in OCI 121,000 [1] 0 [2]
Total net (losses) gains for the period included in net income (149,000) [3],[4] 0 [5],[6]
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements (1,738,000) 0
Transfers into Level 3 0 21,741,000
Transfers out of Level 3 0 0
Fair value, Ending balance 19,975,000 21,741,000
AFS Fixed Maturity Securities [Member] | Corporate Securities [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, Beginning balance 2,603,000 0
Total net (losses) gains for the period included in OCI 121,000 [1] 0 [2]
Total net (losses) gains for the period included in net income 0 [3],[4] 0 [5],[6]
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements (629,000) 0
Transfers into Level 3 788,000 2,603,000
Transfers out of Level 3 0 0
Fair value, Ending balance 2,883,000 2,603,000
AFS Fixed Maturity Securities [Member] | Asset-backed Securities [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, Beginning balance 0  
Total net (losses) gains for the period included in OCI 20,000 [1]  
Total net (losses) gains for the period included in net income 0 [3],[4]  
Purchases 7,299,000  
Sales 0  
Issuances 0  
Settlements     
Transfers into Level 3 0  
Transfers out of Level 3 0  
Fair value, Ending balance 7,319,000  
AFS Fixed Maturity Securities [Member] | Commercial Mortgage-backed Securities ("CMBS") [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, Beginning balance 354,000 185,000
Total net (losses) gains for the period included in OCI 517,000 [1] 507,000 [2]
Total net (losses) gains for the period included in net income 4,000 [3],[4] (322,000) [5],[6]
Purchases 5,611,000 0
Sales 0 0
Issuances 0 0
Settlements (22,000) (16,000)
Transfers into Level 3 8,247,000 0
Transfers out of Level 3 0 0
Fair value, Ending balance 14,711,000 354,000
Receivable For Proceeds From Divestiture Of Business [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, Beginning balance 3,212,000 5,002,000
Total net (losses) gains for the period included in OCI 0 [1] 0 [2]
Total net (losses) gains for the period included in net income 187,000 [3],[4] (638,000) [5],[6]
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements (600,000) (1,152,000)
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Fair value, Ending balance 2,799,000 3,212,000
Fair Value, Inputs, Level 3 [Member] | AFS Fixed Maturity Securities [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Transfers into Level 3 $ 9,000,000  
[1] 1 Amounts are reported in “Unrealized holding gains arising during period” on the Consolidated Statements of Comprehensive Income.
[2] 1 Amounts are reported in “Other net unrealized gains on investment securities, net of deferred income tax” on the Consolidated Statements of Stockholders’ Equity in our 2011 Annual Report
[3] 2 Amounts are reported in “Net realized gains (losses)” for realized gains and losses and “Net investment income earned” for amortization of securities on the Consolidated Statements of Income.
[4] 3 Amounts are reported in “Other income” for the receivable related to the sale of Selective HR on the Consolidated Statements of Income, and are related to interest accretion on the receivable.
[5] 3 Amounts are reported in either “Loss on disposal of discontinued operations, net of tax” or “Other income” for the receivable related to the sale of Selective HR on the Consolidated Statements of Income in our 2011 Annual Report. Amounts in “Loss on disposal of discontinued operations, net of tax” related to charges to reduce the fair value of our receivable, and amounts in “Other income” related to interest accretion on the receivable in our 2011 Annual Report.
[6] 2 Amounts are reported in “Net realized gains (losses)” for realized gains and losses and “Net investment income earned” for amortization for the CMBS securities on the Consolidated Statements of Income in our 2011 Annual Report