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INVESTMENT SECURITIES - Investments classified by contractual maturity date (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Available-for-Sale - Amortized Cost |  |
After three through four years | $ 245 |
After four through five years | 936 |
After five through fifteen years | 6,365 |
After fifteen years | 51,857 |
Securities not due on a single maturity date | 479,754 |
Available-for-sale securities, Amortized Cost, Total | 539,157 | $ 553,214
Available-for-Sale - Fair Value |  |
After three through four years | 245 |
After four through five years | 940 |
After five through fifteen years | 6,135 |
After fifteen years | 49,403 |
Securities not due on a single maturity date | 420,188 |
Available-for-sale securities, Fair Value, Total | 476,911 | 490,592
Held-to-Maturity - Amortized Carrying Value |  |
After five through fifteen years | 3,250 |
After fifteen years | 2,958 |
Securities not due on a single maturity date | 192,179 |
Amortized Carrying Value | 198,387 | 202,495
Held-to-Maturity - Fair Value |  |
After five through fifteen years | 2,896 |
After fifteen years | 2,633 |
Securities not due on a single maturity date | 168,132 |
Total fair value of held-to-maturity | $ 173,661 | $ 177,765

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