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Guarantees (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Guarantee Obligations [Line Items]      
Acquired standby letters of credit and financial guarantees $ 12,600   $ 23,900
Unpaid principal balance of residential subject loans subject to credit recourse 5,300   5,400
Liability for estimated credit losses to loans sold with credit recourse 214   346
Repurchased loans not subject to credit recourse provision 1,900 $ 2,300  
Losses from repurchased loans subject to credit recourse 116 100  
Losses On Repurchased Loan Not Subject To Credit Recourse 16 $ 1  
Serviced mortgage loans for third parties 900,000   895,600
Funds Advanced To Investors Under Servicing Agreements $ 647   $ 706