Residential Mortgage Servicing Rights (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Oct. 31, 2019
Payments for (Proceeds from) Mortgage Servicing Rights [Abstract]
Sale of MSR assets	$ 0	$ (34,401)	$ 0
Balance Of Loans Serviced For Others Sold				$ 3,400,000
Transfers and Servicing [Abstract]
Contractually specified servicing fees, late fees and ancillary fees earned	$ 35,700	$ 42,200	$ 42,800