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Investments (Aggregate Carrying And Approximate Market Values Of Held-To-Maturity Securities) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held-to-Maturity, Amortized Cost | $ 60,030 | $ 64,449
Securities held-to-maturity, Accumulated Unrecognized Holding Gain | 0 | 1,222
Securities held-to-maturity, Accumulated Unrecognized Holding Loss | 402 | 25
Securities held-to-maturity, Estimated Fair Value | 59,628 | 65,646
U.S. Government Agencies Mortgage-backed Securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held-to-Maturity, Amortized Cost | 56,030 | 60,449
Securities held-to-maturity, Accumulated Unrecognized Holding Gain | 0 | 1,222
Securities held-to-maturity, Accumulated Unrecognized Holding Loss | 402 | 25
Securities held-to-maturity, Estimated Fair Value | 55,628 | 61,646
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

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- Definition Amount of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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- Definition Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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