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SECURITIES (Securities Debt Maturities) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Investments, Debt and Equity Securities [Abstract] |  |
Available-for-sale Securities, Amortized Cost, Maturing in one year or less | $ 0 |
Available-for-sale Securities, Amortized Cost, Maturing after one year through five years | 97,908 |
Available-for-sale Securities, Amortized Cost, Maturing after five years through ten years | 378,531 |
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 | 2,141,547 |
Debt Securities, Available-for-sale, Amortized Cost | 2,617,986 | $ 2,729,980
Available-for-sale Securities, Fair Value, Maturing in one year or less | 0 |
Available-for-sale Securities, Fair Value, Maturing after one year through five years | 92,601 |
Available-for-sale Securities, Fair Value, Maturing after five years through ten years | 333,217 |
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 | 1,819,121 |
Debt Securities, Available-for-sale | 2,244,939 | 2,373,783
Held-to-maturity Securities, Amortized Cost, Maturing in one year or less | 3,670 |
Held-to-maturity Securities, Amortized Cost, Maturing after one year through five years | 18,498 |
Held-to-maturity Securities, Amortized Cost, Maturing after five years through ten years | 21,005 |
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10 | 995,461 |
Held-to-maturity Securities, Amortized Cost | 1,038,634 | 1,059,387
Held-to-maturity Securities, Fair Value, Maturing in one year or less | 3,461 |
Held-to-maturity Securities, Fair Value, Maturing after one year through five years | 18,128 |
Held-to-maturity Securities, Fair Value, Maturing after five years through ten years | 19,880 |
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 | 827,628 |
Debt Securities, Held-to-maturity, Fair Value | $ 869,097 | $ 907,514

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