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INVESTMENT SECURITIES - Investments classified by contractual maturity date (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Available-for-Sale - Amortized Cost |  |
After three through four years | $ 245 |
After four through five years | 927 |
After five through fifteen years | 6,390 |
After fifteen years | 51,971 |
Securities not due on a single maturity date | 487,247 |
Available-for-sale securities, Amortized Cost, Total | 546,780 | $ 553,214
Available-for-Sale - Fair Value |  |
After three through four years | 246 |
After four through five years | 952 |
After five through fifteen years | 6,200 |
After fifteen years | 50,508 |
Securities not due on a single maturity date | 435,424 |
Available-for-sale securities, Fair Value, Total | 493,330 | 490,592
Held-to-Maturity - Amortized Carrying Value |  |
After five through fifteen years | 3,251 |
After fifteen years | 2,967 |
Securities not due on a single maturity date | 194,209 |
Held-to-Maturity, Amortized Carrying Value, Total | 200,427 | 202,495
Held-to-Maturity - Fair Value |  |
After five through fifteen years | 2,952 |
After fifteen years | 2,674 |
Securities not due on a single maturity date | 174,227 |
Held-to-maturity, Fair Value, Total | $ 179,853 | $ 177,765

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