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Guarantees (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Guarantee Obligations [Line Items]      
Acquired standby letters of credit and financial guarantees $ 19,500,000 $ 47,300,000  
Unpaid principal balance of residential subject loans subject to credit recourse 135,300,000 147,400,000  
Repurchased GNMA 481,000 0 $ 705,000
Repurchased loans not subject to credit recourse provision 27,900,000 12,000,000 7,700,000
Losses from repurchased loans subject to credit recourse 658,000 (17,000) (556,000)
Gains (loss) on repurchased loan not subject to credit recourse (2,200,000) (123,000) $ (160,000)
Serviced mortgage loans for third parties 5,400,000,000 5,400,000  
Funds Advanced To Investors Under Servicing Agreements 20,700,000 13,200,000  
Scotiabank PR & USVI Acquisition [Member]      
Guarantee Obligations [Line Items]      
Unpaid principal balance of residential subject loans subject to credit recourse   142,500,000  
Loan with recourse [Member]      
Guarantee Obligations [Line Items]      
Liability for estimated credit losses to loans sold with credit recourse 218,000 985,000  
Loan serviced under representation warranties [Member]      
Guarantee Obligations [Line Items]      
Liability for estimated credit losses to loans sold with credit recourse $ 2,600,000 $ 4,600,000