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Debt Securities Held-to-maturity -Additional Information (Details)
Mar. 31, 2022
USD ($)
score
Dec. 31, 2021
USD ($)
score
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Debt Securities, Held-to-maturity        
Held to maturity securities $ 75,984,000 $ 79,461,000    
Allowance for credit losses 7,844,000 8,096,000    
Obligations of Puerto Rico, States and political subdivisions        
Debt Securities, Held-to-maturity        
Held to maturity securities 70,000,000 73,476,000    
Allowance for credit losses $ 7,844,000 $ 8,096,000 $ 10,096,000 $ 10,261,000
Average Credit Score Fico | score 704 704    
Percentage of nominal value 65.00% 64.00%    
Obligations of Puerto Rico, States and political subdivisions | Munis Payable From Real and Personal Property Taxes        
Debt Securities, Held-to-maturity        
Held to maturity securities $ 27,245,000 $ 30,145,000    
Allowance for credit losses 300,000 300,000    
Obligations of Puerto Rico, States and political subdivisions | Munis Not Guaranteed By Puerto Rico Central Government        
Debt Securities, Held-to-maturity        
Held to maturity securities 43,000,000 43,000,000    
Allowance for credit losses 7,500,000 7,800,000    
Past due        
Debt Securities, Held-to-maturity        
Held to maturity securities $ 0 $ 0