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Debt Securities Held-to-maturity - Credit quality indicators (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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Debt securities held to maturity credit quality indicator [Line Items] |  |
Held to maturity securities | $ 9,352,385 | $ 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 | 62,425 | 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 | 21,560 | 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 | 2,905 | 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 | $ 18,655 | $ 10,925

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