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Guarantees (Narrative) (Details) - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Guarantee Obligations [Line Items]      
Acquired standby letters of credit and financial guarantees $ 4,500,000   $ 4,000,000
Unpaid principal balance of residential subject loans subject to credit recourse 8,000,000   20,100,000
Repurchased GNMA 41,000 $ 209,000  
Liability for estimated credit losses to loans sold with credit recourse 570,000   710,000
Repurchased loans not subject to credit recourse provision 978,000 1,500,000  
Losses from repurchased loans subject to credit recourse 100,000 19,000  
Losses On Repurchased Loan Not Subject To Credit Recourse 308,000 $ 501,000  
Serviced mortgage loans for third parties 822,100,000    
Funds Advanced To Investors Under Servicing Agreements $ 367,000   $ 334,000