Servicing Rights (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Mortgage Servicing Rights [Abstract]
Residential Mortgage Loans Serviced	$ 3,360,000,000		$ 3,360,000,000		$ 3,380,000,000
Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset	2,100,000	$ 1,900,000	6,400,000	$ 5,800,000
Valuation allowance increase	$ 305,000	$ 45,000	$ 4,341,000	$ 173,000