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Derivative Instruments (Fair Value Of Derivative Instruments) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Customer Counterparties Loan Interest Rate Swap Assets | Non-hedging interest rate derivatives: | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | $ 318,072 | $ 234,806
Derivative, Fair Value | 7,570 | 7,352
Customer Counterparties Loan Interest Rate Swap Liabilities | Non-hedging interest rate derivatives: | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 225,990 | 207,201
Derivative, Fair Value | 6,881 | 8,111
Financial Institution Counterparties Loan Interest Rate Swap Asset | Non-hedging interest rate derivatives: | Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 232,665 | 207,201
Derivative, Fair Value | 6,903 | 8,111
Financial Institution Counterparties Loan Interest Rate Swap Liabilities | Non-hedging interest rate derivatives: | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 311,484 | 241,995
Derivative, Fair Value | 7,575 | 7,360
Financial Institution Counterparties Loan Interest Rate Swap Liabilities | Derivatives designated as hedges of fair value: | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 4,326 | 4,626
Derivative, Fair Value | $ 2 | $ 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=73719730&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=73719730&loc=d3e13495-108611 + Details
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