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Guarantees (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Guarantee Obligations [Line Items]      
Acquired standby letters of credit and financial guarantees $ 23,900 $ 21,100  
Unpaid principal balance of residential subject loans subject to credit recourse 5,400 6,400  
Repurchased GNMA 705 107  
Liability for estimated credit losses to loans sold with credit recourse 346 358  
Repurchased loans not subject to credit recourse provision 7,700 3,100  
Losses from repurchased loans subject to credit recourse 556 260 $ 380
Losses On Repurchased Loan Not Subject To Credit Recourse 160 477 $ 1,300
Serviced mortgage loans for third parties 895,600 864,900  
Funds Advanced To Investors Under Servicing Agreements $ 706 $ 440