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Loans (Narratives) (Details) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Loans And Leases Receivable Disclosure [Line Items]      
Originated loans granted to Puerto Rico government $ 157,400,000 $ 134,000,000.0  
Financing receivable modifications. recorded investment not included in non-accrual 105,300,000 103,700,000  
Balance of revolving loans converted to term loans, amount 25,000,000.0    
Commitment to lend additional funds 0   $ 0
Loan deferral amount, pandemic related $ 2,100,000,000    
Mortagage Loans - GNMA Buy-Back Option Program [Member]      
Loans And Leases Receivable Disclosure [Line Items]      
Delinquent loans   $ 75,100,000