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Debt Securities Held-to-maturity -Additional Information (Details)
Dec. 31, 2023
USD ($)
score
Dec. 31, 2022
USD ($)
score
Dec. 31, 2021
USD ($)
Schedule of Held-to-maturity Securities [Line Items]      
Held to maturity securities $ 8,852,825,000 $ 9,356,739,000  
Allowance for credit losses 5,780,000 6,911,000  
Obligations of Puerto Rico, States and political subdivisions      
Schedule of Held-to-maturity Securities [Line Items]      
Held to maturity securities 65,408,000 65,921,000  
Allowance for credit losses $ 5,780,000 $ 6,911,000 $ 8,096,000
Average Credit Score Fico | score 708 707  
Percentage of nominal value 67.00% 65.00%  
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 $ 18,820,000 $ 24,660,000  
Allowance for credit losses 200,000 300,000  
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 40,000,000 42,000,000  
Allowance for credit losses 5,600,000 6,600,000  
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 7,000,000    
Allowance for credit losses 0    
Past due      
Schedule of Held-to-maturity Securities [Line Items]      
Held to maturity securities $ 0 $ 0