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Guarantees (Narrative) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Guarantee Obligations [Line Items]          
Acquired standby letters of credit and financial guarantees $ 16,200,000   $ 16,200,000   $ 47,300,000
Unpaid principal balance of residential subject loans subject to credit recourse 136,800,000   136,800,000   147,400,000
Repurchased GNMA 1,000 $ 0 481,000 $ 0  
Repurchased loans not subject to credit recourse provision 9,600,000 528,000 18,200,000 10,500,000  
Losses from repurchased loans subject to credit recourse 57,000 20,000 1,000 48,000  
Gains (loss) on repurchased loan not subject to credit recourse 892,000 $ (19,000) (1,200,000) $ (60,000)  
Serviced mortgage loans for third parties 4,300,000,000   4,300,000,000   4,400,000,000
Funds Advanced To Investors Under Servicing Agreements 4,600,000   4,600,000   3,600,000
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 876,000   876,000   985,000
Loan serviced under representation warranties [Member]          
Guarantee Obligations [Line Items]          
Liability for estimated credit losses to loans sold with credit recourse $ 2,800,000   $ 2,800,000   $ 4,600,000