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Guarantees (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Guarantee Obligations [Line Items]          
Acquired standby letters of credit and financial guarantees $ 12,500   $ 12,500   $ 23,900
Unpaid principal balance of residential subject loans subject to credit recourse 5,300   5,300   5,400
Liability for estimated credit losses to loans sold with credit recourse 225   225   346
Repurchased loans not subject to credit recourse provision 8,100 $ 2,400 10,000 $ 4,700  
Losses from repurchased loans subject to credit recourse 48 375 68 375  
Losses On Repurchased Loan Not Subject To Credit Recourse 25 $ 31 42 $ 30  
Serviced mortgage loans for third parties 892,100   892,100   895,600
Funds Advanced To Investors Under Servicing Agreements $ 607   $ 607   $ 706