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Guarantees (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Guarantee Obligations [Line Items]          
Acquired standby letters of credit and financial guarantees $ 15,700   $ 15,700   $ 21,100
Unpaid principal balance of residential subject loans subject to credit recourse 5,500   5,500   6,400
Repurchased GNMA 234   569 $ 107  
Liability for estimated credit losses to loans sold with credit recourse 204   204   358
Repurchased loans not subject to credit recourse provision 1,600 $ 625 5,900 3,000  
Losses from repurchased loans subject to credit recourse 30   406 354  
Losses On Repurchased Loan Not Subject To Credit Recourse 41 $ 74 71 $ 517  
Serviced mortgage loans for third parties 891,000   891,000   864,900
Funds Advanced To Investors Under Servicing Agreements $ 798   $ 798   $ 440