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Guarantees (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Guarantee Obligations [Line Items]          
Acquired standby letters of credit and financial guarantees $ 33,900   $ 33,900   $ 19,500
Unpaid principal balance of residential subject loans subject to credit recourse 124,900   124,900   135,300
Repurchased GNMA 517 $ 1 2,400 $ 481  
Repurchased loans not subject to credit recourse provision 8,800 9,600 31,400 18,200  
Losses from repurchased loans subject to credit recourse (85) (57) (153) (1)  
Gains (loss) on repurchased loan not subject to credit recourse (728) $ 892 (3,500) $ (1,200)  
Serviced mortgage loans for third parties 5,600,000   5,600,000   5,400,000
Funds Advanced To Investors Under Servicing Agreements 16,800   16,800   20,700
Loan with recourse [Member]          
Guarantee Obligations [Line Items]          
Liability for estimated credit losses to loans sold with credit recourse 291   291   218
Loan serviced under representation warranties [Member]          
Guarantee Obligations [Line Items]          
Liability for estimated credit losses to loans sold with credit recourse $ 4,000   $ 4,000   $ 2,600