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Debt Securities Held-to-maturity - Credit quality indicators (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Debt securities held to maturity credit quality indicator [Line Items]    
Held to maturity securities $ 8,697,641 $ 8,852,825
Obligations of Puerto Rico, States and political subdivisions    
Debt securities held to maturity credit quality indicator [Line Items]    
Held to maturity securities 61,712 65,408
Obligations of Puerto Rico, States and political subdivisions | Munis Payable From Real and Personal Property Taxes    
Debt securities held to maturity credit quality indicator [Line Items]    
Held to maturity securities 15,520 18,820
Watch | Obligations of Puerto Rico, States and political subdivisions | Munis Payable From Real and Personal Property Taxes    
Debt securities held to maturity credit quality indicator [Line Items]    
Held to maturity securities 2,255 2,255
Pass | Obligations of Puerto Rico, States and political subdivisions | Munis Payable From Real and Personal Property Taxes    
Debt securities held to maturity credit quality indicator [Line Items]    
Held to maturity securities $ 13,265 $ 16,565