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Derivative Instruments (Fair Value Of Derivative Instruments) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Customer Counterparties Loan Interest Rate Swap Assets [Member] | Non-hedging interest rate derivatives: | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | $ 45,959 | $ 225,480
Derivative, Fair Value | 668 | 4,877
Customer Counterparties Loan Interest Rate Swap Liabilities [Member] | Non-hedging interest rate derivatives: | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 458,602 | 314,450
Derivative, Fair Value | 26,163 | 9,513
Financial Institution Counterparties Loan Interest Rate Swap Asset [Member] | Non-hedging interest rate derivatives: | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 464,569 | 320,949
Derivative, Fair Value | 26,389 | 9,591
Financial Institution Counterparties Loan Interest Rate Swap Asset [Member] | Derivatives designated as hedges of fair value: | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 3,733 | 4,326
Derivative, Fair Value | 131 | 34
Financial Institution Counterparties Loan Interest Rate Swap Liabilities [Member] | Non-hedging interest rate derivatives: | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 45,959 | 218,924
Derivative, Fair Value | $ 668 | $ 4,877

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 + 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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