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Guarantees (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Guarantee Obligations [Line Items]      
Acquired standby letters of credit and financial guarantees $ 21,600   $ 47,300
Unpaid principal balance of residential subject loans subject to credit recourse 140,500   147,400
Repurchased GNMA 479 $ 0  
Repurchased loans not subject to credit recourse provision 8,400 1,900  
Losses from repurchased loans subject to credit recourse 14 116  
Losses On Repurchased Loan Not Subject To Credit Recourse 405 $ 16  
Serviced mortgage loans for third parties 4,300,000   4,400,000
Funds Advanced To Investors Under Servicing Agreements 3,800   3,600
Scotiabank PR & USVI Acquisition [Member]      
Guarantee Obligations [Line Items]      
Unpaid principal balance of residential subject loans subject to credit recourse     142,500
Loan with recourse [Member]      
Guarantee Obligations [Line Items]      
Liability for estimated credit losses to loans sold with credit recourse 906   985
Loan serviced under representation warranties [Member]      
Guarantee Obligations [Line Items]      
Liability for estimated credit losses to loans sold with credit recourse $ 4,000   $ 4,600