Borrowings (Summary Of Outstanding Borrowings) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Short-term Debt [Line Items]
Total short-term borrowings	$ 446,200	$ 331,500
Subordinated notes, net	39,131	39,061
Total borrowings	485,331	370,561
Federal Home Loan Bank Advances [Member]
Short-term Debt [Line Items]
Total short-term borrowings	$ 446,200	$ 331,500