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Investments (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended |  | 0 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2014 security | Mar. 31, 2013 | Dec. 31, 2013 | Mar. 31, 2014 Minimum [Member] | Mar. 31, 2014 Maximum [Member] | Apr. 02, 2014 Subsequent Event [Member]
Schedule of Investments [Line Items] |  |  |  |  |  |
Equity ownership positions in the community bank holding companies |  |  |  | 2.00% | 5.00% |
Credit-related net investment impairment losses | $ 0 | $ 0 | $ 0 |  |  |
Regional community bank stocks, percent of average trading volumes (less than 0.1%) |  | 0.10% |  |  |  |
Number Of Pooled Trust Preferred Securities | 5 |  |  |  |  |
Pooled trust preferred securities, book value | 3.0 |  |  |  |  |
Pooled trust preferred securities, estimated fair value | 1.6 |  |  |  |  |
Annual prepayment rate | 1.00% |  | 1.00% |  |  |
Annual prepayments maturity | 100.00% |  | 100.00% |  |  |
Additional basis points | 1.50% |  | 1.50% |  |  |
Carrying value of securities pledged | 270 |  | 278 |  |  |
Held-to-maturity Securities, Transferred Security, at Carrying Value |  |  |  |  |  | 83.4
Held-to-maturity Securities, Transferred Security, Unrealized Gain (Loss) | $ 0.1 |  |  |  |  | $ 0.1

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