Interest Rate Swap Derivatives (Offsetting Assets And Liabilities) (Details) - Not Designated as Hedging Instrument - Interest Rate Swap - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Other Assets
Derivative [Line Items]
Asset derivative, fair value	$ 18,097	$ 8,646
Asset derivative, amounts offset in the balance sheet	0	0
Asset derivative, net amounts in the balance sheet	18,097	8,646
Asset derivative, netting adjustment per applicable master netting agreements	0	0
Asset derivative, fair value of financial collateral in the balance sheet	0	0
Asset derivative, net amount	18,097	8,646
Other Liabilities
Derivative [Line Items]
Liability derivatives, fair value	18,097	8,646
Liability derivatives, amounts offset in balance sheet	0	0
Liability derivatives, net amounts in balance sheet	18,097	8,646
Liability derivatives, netting adjustment per applicable master netting agreements	0	0
Liability derivatives, fair value of financial collateral in the balance sheet	19,525	8,595
Liability derivatives, net amount	$ (1,428)	$ 51