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Guarantees (Narrative) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Guarantee Obligations [Line Items]          
Acquired standby letters of credit and financial guarantees $ 2,400,000   $ 2,400,000   $ 14,700,000
Unpaid principal balance of residential subject loans subject to credit recourse 20,400,000   20,400,000   22,400,000
Liability for estimated credit losses to loans sold with credit recourse 191,000   191,000   439,000
Repurchased loans not subject to credit recourse provision 791,000 $ 7,700,000 3,100,000 $ 19,500,000  
Losses from repurchased loans subject to credit recourse 202,000 418,000 313,000 1,000,000  
Losses On Repurchased Loan Not Subject To Credit Recourse 208,000 500,000 1,000,000 2,000,000  
Serviced mortgage loans for third parties 752,500,000   752,500,000    
Funds Advanced To Investors Under Servicing Agreements 330,000   330,000   $ 301,000
Loan with recourse [Member]          
Guarantee Obligations [Line Items]          
Repurchased GNMA $ 133,000 $ 165,000 $ 421,000 $ 3,400,000