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INVESTMENT SECURITIES - Investments classified by contractual maturity date (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Available-for-Sale - Amortized Cost |  |
After two through three years | $ 245 |
After three through four years | 977 |
After five through fifteen years | 10,652 |
After fifteen years | 46,868 |
Securities not due on a single maturity date | 545,135 |
Available-for-sale securities, Amortized Cost, Total | 603,877 | $ 531,892
Available-for-Sale - Fair Value |  |
After two through three years | 245 |
After three through four years | 995 |
After five through fifteen years | 10,523 |
After fifteen years | 45,828 |
Securities not due on a single maturity date | 507,634 |
Available-for-sale securities, Fair Value, Total | 565,225 | 478,207
Held-to-Maturity - Amortized Carrying Value |  |
After five through fifteen years | 3,246 |
After fifteen years | 2,915 |
Securities not due on a single maturity date | 183,096 |
Held-to-Maturity, Amortized Carrying Value, Total | 189,257 | 195,023
Held-to-Maturity - Fair Value |  |
After five through fifteen years | 2,953 |
After fifteen years | 2,671 |
Securities not due on a single maturity date | 164,418 |
Held-to-maturity, Fair Value, Total | $ 170,042 | $ 171,193

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