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Long- Term Debt to Affiliated Trust Long-Term Debt to Affiliated Trust (Schedule of Distribution Rates Paid) (Details) - Trust Preferred Securities Subject to Mandatory Redemption [Member] | Jun. 30, 2018 | Dec. 31, 2017
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Debt Instrument [Line Items] |  |
Interest Rate at End of Period | 3.18% | 2.36%
Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Interest Rate at End of Period | 2.36% | 1.81%
Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Interest Rate at End of Period | 3.18% | 2.36%

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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