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Investments (Aggregate Carrying And Approximate Market Values Of Held-To-Maturity Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held-to-Maturity, Amortized Cost | $ 66,989 | $ 75,169
Securities held-to-maturity, Accumulated Unrecognized Holding Gain | 1,489 | 1,346
Securities held-to-maturity, Accumulated Unrecognized Holding Loss | 0 | 70
Securities held-to-maturity, Estimated Fair Value | 68,478 | 76,445
Other investment securities, at Cost | 15,988 | 14,352
Other investment securities, Fair Value | 15,988 | 14,352
U.S. Government Agencies Mortgage-backed Securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held-to-Maturity, Amortized Cost | 62,989 | 71,169
Securities held-to-maturity, Accumulated Unrecognized Holding Gain | 1,489 | 1,346
Securities held-to-maturity, Accumulated Unrecognized Holding Loss | 0 | 70
Securities held-to-maturity, Estimated Fair Value | 64,478 | 72,445
Trust Preferred Securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held-to-Maturity, Amortized Cost | 4,000 | 4,000
Securities held-to-maturity, Accumulated Unrecognized Holding Gain | 0 | 0
Securities held-to-maturity, Accumulated Unrecognized Holding Loss | 0 | 0
Securities held-to-maturity, Estimated Fair Value | 4,000 | 4,000
Non-Marketable Equity Securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Other investment securities, at Cost | 15,988 | 14,352
Other investment securities, Fair Value | $ 15,988 | $ 14,352

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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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