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Derivative Instruments (Fair Value Of Derivative Instruments) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Customer Counterparties Loan Interest Rate Swap Assets | Not Designated as Hedging Instrument | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | $ 225,480 | $ 234,806
Fair Value | 4,877 | 7,352
Customer Counterparties Loan Interest Rate Swap Liabilities | Not Designated as Hedging Instrument | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 314,450 | 207,201
Fair Value | 9,513 | 8,111
Financial Institution Counterparties Loan Interest Rate Swap Asset | Not Designated as Hedging Instrument | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 320,949 | 207,201
Fair Value | 9,591 | 8,111
Financial Institution Counterparties Loan Interest Rate Swap Asset | Designated as Hedging Instrument | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 4,326 | 0
Fair Value | 34 | 0
Financial Institution Counterparties Loan Interest Rate Swap Liabilities | Not Designated as Hedging Instrument | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 218,924 | 241,995
Fair Value | 4,877 | 7,360
Financial Institution Counterparties Loan Interest Rate Swap Liabilities | Designated as Hedging Instrument | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 0 | 4,626
Fair Value | $ 0 | $ 12

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 + 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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