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Investments (Aggregate Carrying And Approximate Market Values Of Held-To-Maturity Securities) (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
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Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held-to-maturity, Amortized Cost | $ 83,208 | $ 88,937
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 3,736 | 1,949
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 0 | 76
Securities held-to-maturity, Estimated Fair Value | 86,944 | 90,810
Other Investments and Securities, at Cost | 10,203 | 12,915
Other Investment Not Readily Marketable, Fair Value | 10,203 | 12,915
U.S. Government Agencies Mortgage-backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held-to-maturity, Amortized Cost | 79,208 | 84,937
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 3,736 | 1,949
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 0 | 76
Securities held-to-maturity, Estimated Fair Value | 82,944 | 86,810
Asset-backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held-to-maturity, Amortized Cost | 4,000 | 4,000
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 0 | 0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 0 | 0
Securities held-to-maturity, Estimated Fair Value | 4,000 | 4,000
Non-Marketable Equity Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Other Investments and Securities, at Cost | 10,203 | 12,915
Other Investment Not Readily Marketable, Fair Value | $ 10,203 | $ 12,915

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- Definition Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 + Details
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