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Guarantees (Narrative) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Guarantee Obligations [Line Items]          
Acquired standby letters of credit and financial guarantees $ 2,300,000   $ 2,300,000   $ 14,700,000
Unpaid principal balance of residential subject loans subject to credit recourse 21,100,000   21,100,000   22,400,000
Liability for estimated credit losses to loans sold with credit recourse 162,000   162,000   439,000
Repurchased loans not subject to credit recourse provision 817,000 $ 2,700,000 2,300,000 $ 11,700,000  
Losses from repurchased loans subject to credit recourse 92,000 476,000 111,000 583,000  
Losses On Repurchased Loan Not Subject To Credit Recourse 329,000 742,000 830,000 1,500,000  
Serviced mortgage loans for third parties 726,600,000   726,600,000    
Funds Advanced To Investors Under Servicing Agreements 339,000   339,000   $ 301,000
Loan with recourse [Member]          
Guarantee Obligations [Line Items]          
Repurchased GNMA $ 83,000 $ 1,200,000 $ 288,000 $ 3,400,000