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INVESTMENT SECURITIES - Fair value and unrealized losses on investments (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
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AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than 12 Months, Fair Value | $ 5,133 | $ 21,180
Available-for-sale Securities, Less than 12 Months, Unrealized Loss | (45) | (358)
Available-for-sale securities, 12 Months or More, Fair Value | 427,737 | 435,747
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (42,544) | (53,861)
Available-for-sale securities, Fair Value | 432,870 | 456,927
Available-for-sale securities, Unrealized Loss | (42,589) | (54,219)
HELD-TO-MATURITY SECURITIES: |  |
Held-to-maturity securities, 12 Months or Longer, Fair Value | 170,042 | 171,193
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses | (19,215) | (23,830)
Held-to-maturity securities, Fair Value | 170,042 | 171,193
Held-to-maturity securities, Unrealized Losses | (19,215) | (23,830)
Agency mortgage-backed securities. |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than 12 Months, Fair Value | 3,784 | 4,318
Available-for-sale Securities, Less than 12 Months, Unrealized Loss | (34) | (9)
Available-for-sale securities, 12 Months or More, Fair Value | 269,222 | 274,801
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (28,026) | (35,881)
Available-for-sale securities, Fair Value | 273,006 | 279,119
Available-for-sale securities, Unrealized Loss | (28,060) | (35,890)
HELD-TO-MATURITY SECURITIES: |  |
Held-to-maturity securities, 12 Months or Longer, Fair Value | 67,030 | 66,245
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses | (6,351) | (8,686)
Held-to-maturity securities, Fair Value | 67,030 | 66,245
Held-to-maturity securities, Unrealized Losses | (6,351) | (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 | 66,735 | 66,866
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (7,385) | (9,827)
Available-for-sale securities, Fair Value | 66,735 | 75,946
Available-for-sale securities, Unrealized Loss | (7,385) | (10,043)
HELD-TO-MATURITY SECURITIES: |  |
Held-to-maturity securities, 12 Months or Longer, Fair Value | 97,389 | 99,241
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses | (12,327) | (14,662)
Held-to-maturity securities, Fair Value | 97,389 | 99,241
Held-to-maturity securities, Unrealized Losses | (12,327) | (14,662)
States and political subdivisions securities |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than 12 Months, Fair Value | 1,349 | 7,782
Available-for-sale Securities, Less than 12 Months, Unrealized Loss | (11) | (133)
Available-for-sale securities, 12 Months or More, Fair Value | 37,640 | 56,111
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (1,464) | (6,622)
Available-for-sale securities, Fair Value | 38,989 | 63,893
Available-for-sale securities, Unrealized Loss | (1,475) | (6,755)
HELD-TO-MATURITY SECURITIES: |  |
Held-to-maturity securities, 12 Months or Longer, Fair Value | 5,623 | 5,707
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses | (537) | (482)
Held-to-maturity securities, Fair Value | 5,623 | 5,707
Held-to-maturity securities, Unrealized Losses | (537) | (482)
Small Business Administration securities |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, 12 Months or More, Fair Value | 54,140 | 37,969
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (5,669) | (1,531)
Available-for-sale securities, Fair Value | 54,140 | 37,969
Available-for-sale securities, Unrealized Loss | $ (5,669) | $ (1,531)

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