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INVESTMENT SECURITIES (Available for Sale and Held to Maturity Investment Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |  |
Amortized Cost | $ 775,608 | $ 754,950 |
Gross Unrealized Gains | 291 | 507 |
Gross Unrealized Losses | (115,066) | (108,247) |
Fair Value | 660,833 | 647,210 |
ACL | 0 | 0 |
Schedule of Held-to-Maturity Securities [Line Items] |  |  |
Amortized Cost | 624,948 | 632,338 |
Gross Unrecognized Gains | 0 | 61 |
Gross Unrecognized Losses | (83,263) | (67,221) |
Fair Value | 541,685 | 565,178 | $ 673,200
ACL | 0 | 0 |
States and political subdivisions |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Amortized Cost | 152,393 | 156,432 |
Gross Unrealized Gains | 8 | 13 |
Gross Unrealized Losses | (29,378) | (29,810) |
Fair Value | 123,023 | 126,635 |
ACL | 0 | 0 |
Schedule of Held-to-Maturity Securities [Line Items] |  |  |
Amortized Cost | 41,984 | 41,959 |
Gross Unrecognized Gains | 0 | 0 |
Gross Unrecognized Losses | (7,324) | (6,706) |
Fair Value | 34,660 | 35,253 |
ACL | 0 | 0 |
Corporate securities |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Amortized Cost | 35,611 | 35,731 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | (4,213) | (4,317) |
Fair Value | 31,398 | 31,414 |
ACL | 0 | 0 |
U.S. Treasury and other government-sponsored entities and agencies |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Amortized Cost | 41,849 | 28,105 |
Gross Unrealized Gains | 147 | 33 |
Gross Unrealized Losses | (2,090) | (1,941) |
Fair Value | 39,906 | 26,197 |
ACL | 0 | 0 |
Residential - U.S. government-sponsored entities and agencies |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Amortized Cost | 412,443 | 441,898 |
Gross Unrealized Gains | 7 | 95 |
Gross Unrealized Losses | (62,813) | (63,607) |
Fair Value | 349,637 | 378,386 |
ACL | 0 | 0 |
Schedule of Held-to-Maturity Securities [Line Items] |  |  |
Amortized Cost | 582,964 | 590,379 |
Gross Unrecognized Gains | 0 | 61 |
Gross Unrecognized Losses | (75,939) | (60,515) |
Fair Value | 507,025 | 529,925 |
ACL | 0 | 0 |
Residential - Non-government agencies |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Amortized Cost | 18,893 | 19,322 |
Gross Unrealized Gains | 129 | 366 |
Gross Unrealized Losses | (1,081) | (980) |
Fair Value | 17,941 | 18,708 |
ACL | 0 | 0 |
Commercial - U.S. government-sponsored entities and agencies |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Amortized Cost | 99,213 | 58,318 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | (15,334) | (7,404) |
Fair Value | 83,879 | 50,914 |
ACL | 0 | 0 |
Commercial - Non-government agencies |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Amortized Cost | 15,206 | 15,144 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | (157) | (188) |
Fair Value | 15,049 | 14,956 |
ACL | $ 0 | $ 0 |

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