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Loans (Narratives) (Details) - USD ($)
Jun. 26, 2019
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Loans And Leases Receivable Disclosure [Line Items]        
Originated loans granted to Puerto Rico government   $ 121,900,000 $ 134,000,000.0  
Financing receivable modifications. recorded investment not included in non-accrual   98,700,000 103,700,000  
Balance of revolving loans converted to term loans, amount   25,200,000    
Commitment to lend additional funds   0   $ 0
Loan deferral amount, pandemic related   135,000,000    
Loans   6,759,927,000 4,726,493,000  
Allowance for loan and lease losses   235,313,000 116,539,000  
Allowance for loan and lease losses, loans acquired $ 0      
Mortgage Loans - GNMA Buy-Back Option Program [Member]        
Loans And Leases Receivable Disclosure [Line Items]        
Delinquent loans   62,700,000 75,200,000  
Granted To Puerto Rico Government [Member]        
Loans And Leases Receivable Disclosure [Line Items]        
Loans   97,800,000 129,900,000  
One Loan, Public Corporation Acquired [Member]        
Loans And Leases Receivable Disclosure [Line Items]        
Loans   24,100,000 $ 4,100,000  
Allowance for loan and lease losses   $ 20,000,000.0