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INVESTMENT SECURITIES - Available for sale securities (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
AVAILABLE-FOR-SALE SECURITIES: |  |
Amortized Cost | $ 532,220 | $ 553,214
Gross Unrealized Gains | 10 | 119
Gross Unrealized Losses | 84,282 | 62,741
Fair Value | 447,948 | 490,592
Agency mortgage-backed securities |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Amortized Cost | 314,632 | 327,266
Gross Unrealized Losses | 54,143 | 40,784
Fair Value | 260,489 | 286,482
Agency collateralized mortgage obligations |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Amortized Cost | 86,687 | 90,205
Gross Unrealized Losses | 13,553 | 11,731
Fair Value | 73,134 | 78,474
States and political subdivisions securities |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Amortized Cost | 59,273 | 60,667
Gross Unrealized Gains | 10 | 119
Gross Unrealized Losses | 6,893 | 3,291
Fair Value | 52,390 | 57,495
Small Business Administration securities |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Amortized Cost | 71,628 | 75,076
Gross Unrealized Losses | 9,693 | 6,935
Fair Value | $ 61,935 | $ 68,141

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