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INVESTMENT SECURITIES - Schedule of Held To Maturity Credit Quality Indicator (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
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Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Past due held-to-maturity debt securities | $ 1,026,312 | $ 1,058,565
FNMA MBS |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Past due held-to-maturity debt securities | 841,697 | 872,653
FNMA MBS | A+ rated or higher |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Past due held-to-maturity debt securities | 0 | 0
FNMA MBS | Not rated |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Past due held-to-maturity debt securities | 841,697 | 872,653
State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Past due held-to-maturity debt securities | 184,615 | 185,912
State and political subdivisions | A+ rated or higher |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Past due held-to-maturity debt securities | 184,615 | 185,912
State and political subdivisions | Not rated |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Past due held-to-maturity debt securities | $ 0 | $ 0

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