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INVESTMENT SECURITIES - Fair value and unrealized losses on investments (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than 12 Months, Fair Value | $ 18,569 | $ 21,180
Available-for-sale Securities, Less than 12 Months, Unrealized Loss | (189) | (358)
Available-for-sale securities, 12 Months or More, Fair Value | 440,260 | 435,747
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (60,920) | (53,861)
Available-for-sale securities, Fair Value | 458,829 | 456,927
Available-for-sale securities, Unrealized Loss | (61,109) | (54,219)
HELD-TO-MATURITY SECURITIES: |  |
Held-to-maturity securities, 12 Months or Longer, Fair Value | 167,756 | 171,193
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses | (25,610) | (23,830)
Held-to-maturity securities, Fair Value | 167,756 | 171,193
Held-to-maturity securities, Unrealized Losses | (25,610) | (23,830)
Agency mortgage-backed securities. |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than 12 Months, Fair Value | 5,369 | 4,318
Available-for-sale Securities, Less than 12 Months, Unrealized Loss | (46) | (9)
Available-for-sale securities, 12 Months or More, Fair Value | 265,883 | 274,801
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (40,770) | (35,881)
Available-for-sale securities, Fair Value | 271,252 | 279,119
Available-for-sale securities, Unrealized Loss | (40,816) | (35,890)
HELD-TO-MATURITY SECURITIES: |  |
Held-to-maturity securities, 12 Months or Longer, Fair Value | 65,277 | 66,245
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses | (9,210) | (8,686)
Held-to-maturity securities, Fair Value | 65,277 | 66,245
Held-to-maturity securities, Unrealized Losses | (9,210) | (8,686)
Agency collateralized mortgage obligations |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than 12 Months, Fair Value |  | 9,080
Available-for-sale Securities, Less than 12 Months, Unrealized Loss |  | (216)
Available-for-sale securities, 12 Months or More, Fair Value | 75,307 | 66,866
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (10,242) | (9,827)
Available-for-sale securities, Fair Value | 75,307 | 75,946
Available-for-sale securities, Unrealized Loss | (10,242) | (10,043)
HELD-TO-MATURITY SECURITIES: |  |
Held-to-maturity securities, 12 Months or Longer, Fair Value | 96,881 | 99,241
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses | (15,819) | (14,662)
Held-to-maturity securities, Fair Value | 96,881 | 99,241
Held-to-maturity securities, Unrealized Losses | (15,819) | (14,662)
Small Business Administration securities |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than 12 Months, Fair Value |  | 7,782
Available-for-sale Securities, Less than 12 Months, Unrealized Loss |  | (133)
Available-for-sale securities, 12 Months or More, Fair Value | 61,766 | 56,111
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (7,843) | (6,622)
Available-for-sale securities, Fair Value | 61,766 | 63,893
Available-for-sale securities, Unrealized Loss | (7,843) | (6,755)
States and political subdivisions securities |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than 12 Months, Fair Value | 13,200 |
Available-for-sale Securities, Less than 12 Months, Unrealized Loss | (143) |
Available-for-sale securities, 12 Months or More, Fair Value | 37,304 | 37,969
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (2,065) | (1,531)
Available-for-sale securities, Fair Value | 50,504 | 37,969
Available-for-sale securities, Unrealized Loss | (2,208) | (1,531)
HELD-TO-MATURITY SECURITIES: |  |
Held-to-maturity securities, 12 Months or Longer, Fair Value | 5,598 | 5,707
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses | (581) | (482)
Held-to-maturity securities, Fair Value | 5,598 | 5,707
Held-to-maturity securities, Unrealized Losses | $ (581) | $ (482)

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