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SECURITIES AND OTHER INVESTMENTS (Schedule of Amortized Cost and Estimated Fair Value of Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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AFS Securities [Abstract] |  |
Due in one year or less, Amortized Cost | $ 35,082 | $ 52,427
Due in one year or less, Estimated Fair Value | 34,745 | 51,936
Due after one year through five years, Amortized Cost | 168,601 | 150,271
Due after one year through five years, Estimated Fair Value | 167,029 | 149,545
Due after five years through ten years, Amortized Cost | 253,073 | 282,309
Due after five years through ten years, Estimated Fair Value | 234,773 | 261,720
Due after ten years, Amortized Cost | 2,156,321 | 2,130,529
Due after ten years, Estimated Fair Value | 1,765,668 | 1,768,060
Total AFS securities | 2,613,078 | 2,615,536
Total AFS securities, Estimated Fair Value | 2,202,216 | 2,231,261
HTM Securities [Abstract] |  |
Due in one year or less, Carrying Value | 1,048 | 3,065
Due in one year or less, Estimated Fair Value | 1,042 | 3,058
Due after one year through five years, Carrying Value | 31,730 | 34,093
Due after one year through five years, Estimated Fair Value | 32,080 | 34,613
Due after five years through ten years, Carrying Value | 67,865 | 45,919
Due after five years through ten years, Estimated Fair Value | 66,426 | 45,263
Due after ten years, Carrying Value | 728,285 | 754,301
Due after ten years, Estimated Fair Value | 691,797 | 725,140
Total HTM Securities | 828,928 | 837,378
Total HTM securities, Estimated Fair Value | $ 791,345 | $ 808,074

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