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Debt Securities Held-to-maturity -Additional Information (Details)
Sep. 30, 2025
USD ($)
score
Dec. 31, 2024
USD ($)
score
Debt Securities, Held-to-maturity    
Held to maturity securities $ 7,773,319,000 $ 8,237,004,000
Allowance for credit losses 5,837,000 5,317,000
Munis payable from US treasure securities proceeds    
Debt Securities, Held-to-maturity    
Held to maturity securities 6,900,000 6,900,000
Obligations of Puerto Rico, States and political subdivisions    
Debt Securities, Held-to-maturity    
Held to maturity securities 51,597,000 57,182,000
Allowance for credit losses $ 5,837,000 $ 5,317,000
Average Credit Score Fico | score 676 674
Percentage of nominal value 76.00% 72.00%
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 $ 8,700,000 $ 13,000,000
Obligations of Puerto Rico, States and political subdivisions | Munis Payable From Real and Personal Property Taxes | Pass    
Debt Securities, Held-to-maturity    
Held to maturity securities 7,900,000 11,100,000
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 36,000,000 38,000,000
Past due    
Debt Securities, Held-to-maturity    
Held to maturity securities $ 0 $ 0