Long-Term Debt (Schedule Of Subordinated Notes) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	May 15, 2014	Dec. 15, 2013	Dec. 31, 2015
Subordinated Borrowing [Line Items]
Long-Term Debt, Interest Rate 5.65%	5.65%
Subordinated notes, Balance	$ 246,550			$ 246,170
Subordinated Notes Par Amount	$ 249,891
Long-term Debt, Interest Rate 6.95%	6.95%
Subordinated Notes Interest Rate 5.65 Percent [Member]
Subordinated Borrowing [Line Items]
Subordinated notes, Balance	$ 160,195
Subordinated Notes Par Amount	$ 162,000
Subordinated notes, Maturity	Nov. 01, 2023
Interest payments begin		May 15, 2014
Subordinated Notes Interest Rate 6.95 Percent [Member]
Subordinated Borrowing [Line Items]
Subordinated notes, Balance	$ 86,355
Subordinated Notes Par Amount	$ 87,891
Subordinated notes, Maturity	Sep. 01, 2028
Interest payments begin			Dec. 15, 2013