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INVESTMENT SECURITIES - Investments classified by contractual maturity date (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Available-for-Sale - Amortized Cost |  |
After three through four years | $ 245 |
After four through five years | 960 |
After five through fifteen years | 10,726 |
After fifteen years | 47,078 |
Securities not due on a single maturity date | 467,226 |
Available-for-sale securities, Amortized Cost, Total | 526,235 | $ 531,892
Available-for-Sale - Fair Value |  |
After three through four years | 245 |
After four through five years | 974 |
After five through fifteen years | 10,534 |
After fifteen years | 45,230 |
Securities not due on a single maturity date | 408,325 |
Available-for-sale securities, Fair Value, Total | 465,308 | 478,207
Held-to-Maturity - Amortized Carrying Value |  |
After five through fifteen years | 3,247 |
After fifteen years | 2,932 |
Securities not due on a single maturity date | 187,187 |
Held-to-Maturity, Amortized Carrying Value, Total | 193,366 | 195,023
Held-to-Maturity - Fair Value |  |
After five through fifteen years | 2,931 |
After fifteen years | 2,667 |
Securities not due on a single maturity date | 162,158 |
Held-to-maturity, Fair Value, Total | $ 167,756 | $ 171,193

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