Loan Servicing (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Transfers and Servicing of Financial Assets [Abstract]
Serviced sold mortgage loans	$ 2,120,000,000	$ 1,790,000,000	$ 2,120,000,000	$ 1,790,000,000	$ 1,970,000,000
Serviced sold mortgage loans with recourse	3,500,000	2,000,000	3,500,000	2,000,000	1,700,000
Servicing fees included in other service income	1,400,000	$ 1,000,000	4,000,000	$ 2,900,000
Mortgage Loans Sold with Recourse, Reserve	$ 39,000		$ 39,000		$ 30,000