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Guarantees (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Guarantor Obligations [Line Items]      
Acquired standby letters of credit and financial guarantees $ 25,200 $ 19,500  
Unpaid principal balance of residential subject loans subject to credit recourse 121,800 135,300  
Repurchased GNMA 3,100 481 $ 0
Repurchased loans not subject to credit recourse provision 38,900 27,900 12,000
Gains (loss) from repurchased loans subject to credit recourse (157) 658 (17)
Losses on repurchased loan not subject to credit recourse 4,300 2,200 $ 123
Serviced mortgage loans for third parties 5,700,000 5,400,000  
Funds advanced to investors under servicing agreements 12,900 20,700  
Loan with recourse      
Guarantor Obligations [Line Items]      
Liability for estimated credit losses to loans sold with credit recourse 294 218  
Loan serviced under representation warranties      
Guarantor Obligations [Line Items]      
Liability for estimated credit losses to loans sold with credit recourse $ 3,400 $ 2,600