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INVESTMENT SECURITIES - Fair value and unrealized losses on investments (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than 12 Months, Fair Value | $ 8,342 | $ 118,449
Available-for-sale Securities, Less than 12 Months, Unrealized Loss | (258) | (2,511)
Available-for-sale securities, 12 Months or More, Fair Value | 409,689 | 405,484
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (42,157) | (58,818)
Available-for-sale securities, Fair Value | 418,031 | 523,933
Available-for-sale securities, Unrealized Loss | (42,415) | (61,329)
HELD-TO-MATURITY SECURITIES: |  |
Held-to-maturity securities, 12 Months or Longer, Fair Value | 163,589 | 162,765
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses | (17,726) | (24,668)
Held-to-maturity securities, Fair Value | 163,589 | 162,765
Held-to-maturity securities, Unrealized Losses | (17,726) | (24,668)
Agency mortgage-backed securities. |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than 12 Months, Fair Value | 3,274 | 45,977
Available-for-sale Securities, Less than 12 Months, Unrealized Loss | (11) | (1,008)
Available-for-sale securities, 12 Months or More, Fair Value | 245,989 | 253,971
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (27,297) | (39,866)
Available-for-sale securities, Fair Value | 249,263 | 299,948
Available-for-sale securities, Unrealized Loss | (27,308) | (40,874)
HELD-TO-MATURITY SECURITIES: |  |
Held-to-maturity securities, 12 Months or Longer, Fair Value | 65,400 | 64,406
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses | (6,086) | (8,523)
Held-to-maturity securities, Fair Value | 65,400 | 64,406
Held-to-maturity securities, Unrealized Losses | (6,086) | (8,523)
Agency collateralized mortgage obligations |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than 12 Months, Fair Value |  | 50,720
Available-for-sale Securities, Less than 12 Months, Unrealized Loss |  | (890)
Available-for-sale securities, 12 Months or More, Fair Value | 71,782 | 62,903
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (6,550) | (8,881)
Available-for-sale securities, Fair Value | 71,782 | 113,623
Available-for-sale securities, Unrealized Loss | (6,550) | (9,771)
HELD-TO-MATURITY SECURITIES: |  |
Held-to-maturity securities, 12 Months or Longer, Fair Value | 92,626 | 92,858
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses | (11,080) | (15,495)
Held-to-maturity securities, Fair Value | 92,626 | 92,858
Held-to-maturity securities, Unrealized Losses | (11,080) | (15,495)
States and political subdivisions securities |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than 12 Months, Fair Value | 5,068 | 7,229
Available-for-sale Securities, Less than 12 Months, Unrealized Loss | (247) | (270)
Available-for-sale securities, 12 Months or More, Fair Value | 42,155 | 50,665
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (2,802) | (7,685)
Available-for-sale securities, Fair Value | 47,223 | 57,894
Available-for-sale securities, Unrealized Loss | (3,049) | (7,955)
HELD-TO-MATURITY SECURITIES: |  |
Held-to-maturity securities, 12 Months or Longer, Fair Value | 5,563 | 5,501
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses | (560) | (650)
Held-to-maturity securities, Fair Value | 5,563 | 5,501
Held-to-maturity securities, Unrealized Losses | (560) | (650)
Small Business Administration securities |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than 12 Months, Fair Value |  | 14,523
Available-for-sale Securities, Less than 12 Months, Unrealized Loss |  | (343)
Available-for-sale securities, 12 Months or More, Fair Value | 49,763 | 37,945
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (5,508) | (2,386)
Available-for-sale securities, Fair Value | 49,763 | 52,468
Available-for-sale securities, Unrealized Loss | $ (5,508) | $ (2,729)

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