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Guarantees (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Guarantee Obligations [Line Items]      
Acquired standby letters of credit and financial guarantees $ 47,300,000 $ 23,900,000  
Unpaid principal balance of residential subject loans subject to credit recourse 147,400,000 5,400,000 $ 142,500,000
Repurchased GNMA 0 705,000 107,000
Repurchased loans not subject to credit recourse provision 12,000,000 7,700,000  
Losses from repurchased loans subject to credit recourse 17,000 556,000 260,000
Losses On Repurchased Loan Not Subject To Credit Recourse 123,000 160,000 $ 477,000
Serviced mortgage loans for third parties 4,400,000,000 895,600,000  
Funds Advanced To Investors Under Servicing Agreements 3,600,000 706,000  
Loan with recourse [Member]      
Guarantee Obligations [Line Items]      
Liability for estimated credit losses to loans sold with credit recourse 985,000 $ 346,000  
Loan serviced under representation warranties [Member]      
Guarantee Obligations [Line Items]      
Liability for estimated credit losses to loans sold with credit recourse $ 4,600,000