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Guarantees (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Guarantee Obligations [Line Items]      
Acquired standby letters of credit and financial guarantees $ 20,600   $ 19,500
Unpaid principal balance of residential subject loans subject to credit recourse 131,500   135,300
Repurchased GNMA 980 $ 479  
Repurchased loans not subject to credit recourse provision 12,600 8,400  
Losses from repurchased loans subject to credit recourse 22 (14)  
Gains (loss) on repurchased loan not subject to credit recourse (1,300) $ (405)  
Serviced mortgage loans for third parties 5,500,000   5,400,000
Funds Advanced To Investors Under Servicing Agreements 19,100   20,700
Loan with recourse [Member]      
Guarantee Obligations [Line Items]      
Liability for estimated credit losses to loans sold with credit recourse 195   218
Loan serviced under representation warranties [Member]      
Guarantee Obligations [Line Items]      
Liability for estimated credit losses to loans sold with credit recourse $ 2,600   $ 2,600