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Investments (Narrative) (Details) (USD $) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 security | Sep. 30, 2013 | Dec. 31, 2013
Schedule of Investments [Line Items] |  |  |
Credit-related net investment impairment losses | $ 0 | $ 0 | $ 0
Regional community bank stocks, percent of average trading volumes (less than 0.1%) | 0.20% |  |
Number Of Pooled Trust Preferred Securities | 5 |  |
Pooled trust preferred securities, book value | 2,500,000 |  |
Pooled trust preferred securities, estimated fair value | 1,400,000 |  |
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 | 272,000,000 |  | 278,000,000
Held-to-maturity Securities, Transferred Security, at Carrying Value | 83,400,000 |  |
Held-to-maturity Securities, Transferred Security, Unrealized Gain (Loss) | $ 100,000 |  |
Maximum [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Equity ownership positions in the community bank holding companies | 4.00% |  |

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