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Loan Servicing (Narrative) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Transfers and Servicing of Financial Assets [Abstract]          
Serviced sold mortgage loans $ 2,090,000,000.00 $ 1,590,000,000 $ 2,090,000,000.00 $ 1,590,000,000 $ 1,970,000,000
Serviced sold mortgage loans with recourse 3,800,000 2,100,000 3,800,000 2,100,000 1,700,000
Servicing fees included in other service income 1,300,000 $ 1,000,000.0 2,600,000 $ 1,900,000  
Mortgage Loans Sold with Recourse, Reserve $ 53,000   $ 53,000   $ 30,000