Fair Value Disclosures (Summary Of Amount By Which Contractual Principal Exceeds Fair Value For Loans And Other Receivables Measured At Fair Value Under Fair Value Option) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Loans and other receivables	$ 896,470	$ 752,076
Loans and other receivables on nonaccrual status and/or 90 days or greater past due	167,355	159,462
Long-term debt and short-term borrowings	89,345	32,839
All loans and other receivables 90 days or greater past due	$ 33,700	$ 38,700