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Fair Value Measurements (Changes in Fair Value of Securities Using Level 3 Inputs) (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 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 gains (losses) for the period included in OCI 231,000 [1] 507,000 [2]
Total net gains (losses) for the period included in net income 18,000 [3],[4] (960,000) [5],[6]
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements (1,054,000) (1,168,000)
Transfers into Level 3 0 24,344,000
Transfers out of Level 3 0 0
Fair value, Ending balance 27,105,000 27,910,000
Increase/decrease of receivable if retention assumption changed by +/- 10% 100,000  
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 gains (losses) for the period included in OCI 105,000 [1] 0 [2]
Total net gains (losses) for the period included in net income (46,000) [3],[4] 0 [5],[6]
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements (577,000) 0
Transfers into Level 3 0 21,741,000
Transfers out of Level 3 0 0
Fair value, Ending balance 21,223,000 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 gains (losses) for the period included in OCI 99,000 [1] 0 [2]
Total net gains (losses) for the period included in net income 0 [3],[4] 0 [5],[6]
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements (190,000) 0
Transfers into Level 3 0 2,603,000
Transfers out of Level 3 0 0
Fair value, Ending balance 2,512,000 2,603,000
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 gains (losses) for the period included in OCI 27,000 [1] 507,000 [2]
Total net gains (losses) for the period included in net income 0 [3],[4] (322,000) [5],[6]
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements 0 (16,000)
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Fair value, Ending balance 381,000 354,000
Receivable For Proceeds From Divestiture Of Businesses [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 gains (losses) for the period included in OCI 0 [1] 0 [2]
Total net gains (losses) for the period included in net income 64,000 [3],[4] (638,000) [5],[6]
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements (287,000) (1,152,000)
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Fair value, Ending balance $ 2,989,000 $ 3,212,000
[1] 1 Amounts are reported in "Unrealized holding gains (losses) 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] 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.
[6] 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. 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.