Derivative Instruments (Fair Value Of Derivative Instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Customer Counterparties Loan Interest Rate Swap Assets [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 293,291	$ 234,806
Derivative, Fair Value	7,737	7,352
Customer Counterparties Loan Interest Rate Swap Liabilities [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	217,864	207,201
Derivative, Fair Value	7,064	8,111
Financial Institution Counterparties Loan Interest Rate Swap Asset [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	227,711	207,201
Derivative, Fair Value	7,079	8,111
Financial Institution Counterparties Loan Interest Rate Swap Liabilities [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	293,317	241,995
Derivative, Fair Value	7,737	7,360
Financial Institution Counterparties Loan Interest Rate Swap Liabilities [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	4,514	4,626
Derivative, Fair Value	$ 6	$ 12