Derivative Instruments (Fair Value Of Derivative Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 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	$ 261,945	$ 234,806
Derivative, Fair Value	6,562	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	245,311	207,201
Derivative, Fair Value	8,984	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	252,074	207,201
Derivative, Fair Value	8,996	8,111
Financial Institution Counterparties Loan Interest Rate Swap Asset [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	4,626	0
Derivative, Fair Value	6	0
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	261,562	241,995
Derivative, Fair Value	6,525	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	0	4,626
Derivative, Fair Value	$ 0	$ 12