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Guarantees (Narrative) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Guarantee Obligations [Line Items]          
Acquired standby letters of credit and financial guarantees $ 18,200,000   $ 18,200,000   $ 4,000,000
Unpaid principal balance of residential subject loans subject to credit recourse 6,600,000   6,600,000   20,100,000
Repurchased GNMA   $ 133,000 107,000 $ 421,000  
Liability for estimated credit losses to loans sold with credit recourse 452,000   452,000   710,000
Repurchased loans not subject to credit recourse provision 625,000 791,000 3,000,000 3,100,000  
Losses from repurchased loans subject to credit recourse   202,000 354,000 313,000  
Losses On Repurchased Loan Not Subject To Credit Recourse 74,000 $ 208,000 517,000 $ 1,000,000  
Serviced mortgage loans for third parties 862,700,000   862,700,000    
Funds Advanced To Investors Under Servicing Agreements $ 402,000   $ 402,000   $ 334,000