v3.25.1
Debt Securities Held-to-maturity -Additional Information (Details)
Mar. 31, 2025
USD ($)
score
Dec. 31, 2024
USD ($)
score
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Schedule of Held-to-maturity Securities [Line Items]        
Held to maturity securities $ 8,082,335,000 $ 8,237,004,000    
Allowance for credit losses 5,481,000 5,317,000    
Obligations of Puerto Rico, States and political subdivisions        
Schedule of Held-to-maturity Securities [Line Items]        
Held to maturity securities 55,075,000 57,182,000    
Allowance for credit losses $ 5,481,000 $ 5,317,000 $ 5,731,000 $ 5,780,000
Average Credit Score Fico | score 674 674    
Percentage of nominal value 73.00% 72.00%    
Obligations of Puerto Rico, States and political subdivisions | Munis Payable From Real and Personal Property Taxes        
Schedule of Held-to-maturity Securities [Line Items]        
Held to maturity securities $ 11,080,000 $ 12,615,000    
Allowance for credit losses 300,000 100,000    
Obligations of Puerto Rico, States and political subdivisions | Munis Not Guaranteed By Puerto Rico Central Government        
Schedule of Held-to-maturity Securities [Line Items]        
Held to maturity securities 37,000,000 38,000,000    
Allowance for credit losses 5,200,000 5,200,000    
Obligations of Puerto Rico, States and political subdivisions | Munis payable from US treasure securities proceeds        
Schedule of Held-to-maturity Securities [Line Items]        
Held to maturity securities 6,900,000 6,900,000    
Allowance for credit losses 0 0    
Past due        
Schedule of Held-to-maturity Securities [Line Items]        
Held to maturity securities $ 0 $ 0