Residential Mortgage Servicing Rights (Schedule Of Changes In Mortgage Servicing Rights) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Servicing Asset at Fair Value, Amount [Roll Forward]
Balance, beginning of period	$ 139,780	$ 166,217	$ 169,025	$ 153,151
Additions for new MSR capitalized	7,393	8,622	16,772	22,012
Changes due to collection/realization of expected cash flows over time	(6,835)	(6,007)	(20,171)	(18,108)
Changes due to valuation inputs or assumptions	11,045	6,206	(14,243)	17,983
Balance, end of period	$ 151,383	$ 175,038	$ 151,383	$ 175,038
MSR as a percentage of serviced loans	0.96%		0.96%		1.06%