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Guarantees (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Guarantee Obligations [Line Items]      
Acquired standby letters of credit and financial guarantees $ 18,600   $ 21,100
Unpaid principal balance of residential subject loans subject to credit recourse 6,300   6,400
Repurchased GNMA   $ 41  
Liability for estimated credit losses to loans sold with credit recourse 264   358
Repurchased loans not subject to credit recourse provision 2,300 978  
Losses from repurchased loans subject to credit recourse 100 100  
Losses On Repurchased Loan Not Subject To Credit Recourse 1 $ 308  
Serviced mortgage loans for third parties 872,200   864,900
Funds Advanced To Investors Under Servicing Agreements $ 605   $ 440