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INVESTMENT SECURITIES - Fair value and unrealized losses on investments (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
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AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than 12 Months, Fair Value | $ 30,133 | $ 355,027
Available-for-sale Securities, Less than 12 Months, Unrealized Loss | (928) | (38,996)
Available-for-sale securities, 12 Months or More, Fair Value | 437,382 | 116,980
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (61,525) | (23,745)
Available-for-sale securities, Fair Value | 467,515 | 472,007
Available-for-sale securities, Unrealized Loss | (62,453) | (62,741)
HELD-TO-MATURITY SECURITIES: |  |
Held-to-maturity securities, 12 Months or Longer, Fair Value | 173,661 | 56,592
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses | (24,726) |
Held-to-maturity securities, Fair Value | 173,661 |
Held-to-maturity securities, Unrealized Losses | (24,726) |
Held-to-maturity securities, Less than 12 Month, Fair Value |  | 121,173
Held-to-maturity securities, Less than 12 Months, Unrealized Losses |  | (14,278)
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses |  | (10,452)
Held-to-maturity securities, Fair Value |  | 177,765
Held-to-maturity securities, Unrealized Losses |  | (24,730)
Agency mortgage-backed securities. |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than 12 Months, Fair Value | 2,972 | 221,562
Available-for-sale Securities, Less than 12 Months, Unrealized Loss | (245) | (27,597)
Available-for-sale securities, 12 Months or More, Fair Value | 275,522 | 64,918
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (40,498) | (13,187)
Available-for-sale securities, Fair Value | 278,494 | 286,480
Available-for-sale securities, Unrealized Loss | (40,743) | (40,784)
HELD-TO-MATURITY SECURITIES: |  |
Held-to-maturity securities, 12 Months or Longer, Fair Value | 65,887 | 7,868
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses | (10,034) |
Held-to-maturity securities, Fair Value | 65,887 |
Held-to-maturity securities, Unrealized Losses | (10,034) |
Held-to-maturity securities, Less than 12 Month, Fair Value |  | 59,218
Held-to-maturity securities, Less than 12 Months, Unrealized Losses |  | (7,766)
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses |  | (2,054)
Held-to-maturity securities, Fair Value |  | 67,086
Held-to-maturity securities, Unrealized Losses |  | (9,820)
Agency collateralized mortgage obligations |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than 12 Months, Fair Value | 8,908 | 28,537
Available-for-sale Securities, Less than 12 Months, Unrealized Loss | (390) | (3,262)
Available-for-sale securities, 12 Months or More, Fair Value | 67,592 | 40,642
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (10,887) | (8,469)
Available-for-sale securities, Fair Value | 76,500 | 69,179
Available-for-sale securities, Unrealized Loss | (11,277) | (11,731)
HELD-TO-MATURITY SECURITIES: |  |
Held-to-maturity securities, 12 Months or Longer, Fair Value | 102,245 | 44,178
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses | (14,013) |
Held-to-maturity securities, Fair Value | 102,245 |
Held-to-maturity securities, Unrealized Losses | (14,013) |
Held-to-maturity securities, Less than 12 Month, Fair Value |  | 61,055
Held-to-maturity securities, Less than 12 Months, Unrealized Losses |  | (6,411)
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses |  | (7,718)
Held-to-maturity securities, Fair Value |  | 105,233
Held-to-maturity securities, Unrealized Losses |  | (14,129)
States and political subdivisions securities |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than 12 Months, Fair Value | 10,348 | 60,473
Available-for-sale Securities, Less than 12 Months, Unrealized Loss | (106) | (5,224)
Available-for-sale securities, 12 Months or More, Fair Value | 36,979 | 7,667
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (2,781) | (1,711)
Available-for-sale securities, Fair Value | 47,327 | 68,140
Available-for-sale securities, Unrealized Loss | (2,887) | (6,935)
HELD-TO-MATURITY SECURITIES: |  |
Held-to-maturity securities, 12 Months or Longer, Fair Value | 5,529 | 4,546
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses | (679) |
Held-to-maturity securities, Fair Value | 5,529 |
Held-to-maturity securities, Unrealized Losses | (679) |
Held-to-maturity securities, Less than 12 Month, Fair Value |  | 900
Held-to-maturity securities, Less than 12 Months, Unrealized Losses |  | (101)
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses |  | (680)
Held-to-maturity securities, Fair Value |  | 5,446
Held-to-maturity securities, Unrealized Losses |  | (781)
Small Business Administration securities |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than 12 Months, Fair Value | 7,905 | 44,455
Available-for-sale Securities, Less than 12 Months, Unrealized Loss | (187) | (2,913)
Available-for-sale securities, 12 Months or More, Fair Value | 57,289 | 3,753
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (7,359) | (378)
Available-for-sale securities, Fair Value | 65,194 | 48,208
Available-for-sale securities, Unrealized Loss | $ (7,546) | $ (3,291)

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