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Debt Securities Held-to-maturity - Credit quality indicators (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Debt securities held to maturity credit quality indicator [Line Items] |  |
Held to maturity securities | $ 9,004,729 | $ 9,356,739
Obligations of Puerto Rico, States and political subdivisions |  |
Debt securities held to maturity credit quality indicator [Line Items] |  |
Held to maturity securities | 65,802 | 65,921
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 | 18,820 | 24,660
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 | 13,735
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 | $ 16,565 | $ 10,925

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