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Debt Securities Held-to-maturity -Additional Information (Details)
Mar. 31, 2020
USD ($)
score
Dec. 31, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Securities, Held-to-maturity        
Amortized Cost $ 95,263,000 $ 97,662,000    
Allowance for credit losses 919,716,000 477,708,000 $ 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 $ 83,161,000 $ 85,556,000    
Average Credit Score Fico | score 685      
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      
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      
Obligations of Puerto Rico, States and political subdivisions | Securities Investment | Munis Payable From Real and Personal Property Taxes        
Debt Securities, Held-to-maturity        
Allowance for credit losses 3,400,000      
Obligations of Puerto Rico, States and political subdivisions | Bond | Munis Not Guaranteed By Puerto Rico Central Government        
Debt Securities, Held-to-maturity        
Allowance for credit losses $ 10,000,000