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Investments (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 security | Dec. 31, 2012 | Dec. 31, 2011
Schedule of Investments [Line Items] |  |  |
Credit-related net investment impairment losses |  | $ 0.6 | $ 1.3
Number of pooled trust preferred securities | 5 |  |
Annual prepayment rate | 1.00% | 1.00% |
Annual prepayments maturity | 100.00% | 100.00% |
Additional basis points | 150.00% | 150.00% |
Carrying value of securities pledged | 278 | 228 |
Minimum [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Equity ownership positions in the community bank holding companies | 2.00% |  |
Maximum [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Equity ownership positions in the community bank holding companies | 5.00% |  |
Regional community bank stocks, percent of average trading volumes | 0.10% |  |
Pooled Bank Trust Preferred Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Credit-related net investment impairment losses |  | 0.6 | 0.4
Remaining book value | 3.2 | 3.5 | 3.4
Pooled trust preferred securities, estimated fair value | 3.7 |  |
Equity Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Credit-related net investment impairment losses |  |  | 0.9
Remaining book value |  |  | $ 3.9

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