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Debt Securities Held-to-maturity - Credit quality indicators (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
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Debt securities held to maturity credit quality indicator [Line Items] |  |
Held to maturity securities | $ 8,082,335 | $ 8,237,004
Obligations of Puerto Rico, States and political subdivisions |  |
Debt securities held to maturity credit quality indicator [Line Items] |  |
Held to maturity securities | 55,075 | 57,182
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 | 11,080 | 12,615
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 | 1,555 | 1,555
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 | $ 9,525 | $ 11,060

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