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Debt Securities Held-to-maturity -Additional Information (Details)
Jun. 30, 2020
USD ($)
score
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Securities, Held-to-maturity            
Amortized Cost $ 95,429,000   $ 97,662,000      
Allowance for credit losses 918,434,000 $ 919,716,000 477,708,000 $ 543,666,000 $ 550,628,000 $ 569,348,000
Securities in non-performing status 0          
Obligations of Puerto Rico, States and political subdivisions            
Debt Securities, Held-to-maturity            
Amortized Cost $ 83,328,000   $ 85,556,000      
Average Credit Score Fico | score 690          
Percentage of nominal value 65.00%          
Obligations of Puerto Rico, States and political subdivisions | Munis Payable From Real and Personal Property Taxes            
Debt Securities, Held-to-maturity            
Amortized Cost $ 37,625,000          
Allowance for credit losses 3,200,000          
Obligations of Puerto Rico, States and political subdivisions | Munis Not Guaranteed By Puerto Rico Central Government            
Debt Securities, Held-to-maturity            
Amortized Cost 45,000,000          
Allowance for credit losses $ 9,500,000