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Securities (Narrative) (Details) | Mar. 31, 2016 security
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Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items] |
Securities evaluated for other than temporary impairment | 9
S&P Rated AAA [Member] |
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items] |
Securities evaluated for other than temporary impairment | 1
S&P Rated AA [Member] |
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items] |
Securities evaluated for other than temporary impairment | 8

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