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Guarantees (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Guarantee Obligations [Line Items]          
Acquired standby letters of credit and financial guarantees $ 21,300   $ 21,300   $ 21,100
Unpaid principal balance of residential subject loans subject to credit recourse 5,900   5,900   6,400
Repurchased GNMA   $ 66   $ 107  
Liability for estimated credit losses to loans sold with credit recourse 189   189   358
Repurchased loans not subject to credit recourse provision 2,400 1,400 4,700 2,300  
Losses from repurchased loans subject to credit recourse 375 254 375 354  
Losses On Repurchased Loan Not Subject To Credit Recourse 31 $ 283 30 $ 590  
Serviced mortgage loans for third parties 880,400   880,400   864,900
Funds Advanced To Investors Under Servicing Agreements $ 651   $ 651   $ 440