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INVESTMENT SECURITIES - Fair value and unrealized losses on investments (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than 12 Months, Fair Value | $ 30,101 | $ 355,027
Available-for-sale Securities, Less than 12 Months, Unrealized Loss | (2,914) | (38,996)
Available-for-sale securities, 12 Months or More, Fair Value | 416,601 | 116,980
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (81,368) | (23,745)
Available-for-sale securities, Fair Value | 446,702 | 472,007
Available-for-sale securities, Unrealized Loss | (84,282) | (62,741)
HELD-TO-MATURITY SECURITIES: |  |
Held-to-maturity securities, 12 Months or Longer, Fair Value | 166,090 | 56,592
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses | (30,626) | (10,452)
Held-to-maturity securities, Fair Value | 166,090 | 177,765
Held-to-maturity securities, Unrealized Losses | (30,626) | (24,730)
Held-to-maturity securities, Less than 12 Month, Fair Value |  | 121,173
Held-to-maturity securities, Less than 12 Months, Unrealized Losses |  | (14,278)
Agency mortgage-backed securities. |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than 12 Months, Fair Value | 1 | 221,562
Available-for-sale Securities, Less than 12 Months, Unrealized Loss |  | (27,597)
Available-for-sale securities, 12 Months or More, Fair Value | 260,488 | 64,918
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (54,143) | (13,187)
Available-for-sale securities, Fair Value | 260,489 | 286,480
Available-for-sale securities, Unrealized Loss | (54,143) | (40,784)
HELD-TO-MATURITY SECURITIES: |  |
Held-to-maturity securities, 12 Months or Longer, Fair Value | 63,168 | 7,868
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses | (12,340) | (2,054)
Held-to-maturity securities, Fair Value | 63,168 | 67,086
Held-to-maturity securities, Unrealized Losses | (12,340) | (9,820)
Held-to-maturity securities, Less than 12 Month, Fair Value |  | 59,218
Held-to-maturity securities, Less than 12 Months, Unrealized Losses |  | (7,766)
Agency collateralized mortgage obligations |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than 12 Months, Fair Value | 8,236 | 28,537
Available-for-sale Securities, Less than 12 Months, Unrealized Loss | (1,061) | (3,262)
Available-for-sale securities, 12 Months or More, Fair Value | 64,898 | 40,642
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (12,492) | (8,469)
Available-for-sale securities, Fair Value | 73,134 | 69,179
Available-for-sale securities, Unrealized Loss | (13,553) | (11,731)
HELD-TO-MATURITY SECURITIES: |  |
Held-to-maturity securities, 12 Months or Longer, Fair Value | 97,815 | 44,178
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses | (17,195) | (7,718)
Held-to-maturity securities, Fair Value | 97,815 | 105,233
Held-to-maturity securities, Unrealized Losses | (17,195) | (14,129)
Held-to-maturity securities, Less than 12 Month, Fair Value |  | 61,055
Held-to-maturity securities, Less than 12 Months, Unrealized Losses |  | (6,411)
States and political subdivisions securities |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than 12 Months, Fair Value | 14,242 | 60,473
Available-for-sale Securities, Less than 12 Months, Unrealized Loss | (1,387) | (5,224)
Available-for-sale securities, 12 Months or More, Fair Value | 36,902 | 7,667
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (5,506) | (1,711)
Available-for-sale securities, Fair Value | 51,144 | 68,140
Available-for-sale securities, Unrealized Loss | (6,893) | (6,935)
HELD-TO-MATURITY SECURITIES: |  |
Held-to-maturity securities, 12 Months or Longer, Fair Value | 5,107 | 4,546
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses | (1,091) | (680)
Held-to-maturity securities, Fair Value | 5,107 | 5,446
Held-to-maturity securities, Unrealized Losses | (1,091) | (781)
Held-to-maturity securities, Less than 12 Month, Fair Value |  | 900
Held-to-maturity securities, Less than 12 Months, Unrealized Losses |  | (101)
Small Business Administration securities |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than 12 Months, Fair Value | 7,622 | 44,455
Available-for-sale Securities, Less than 12 Months, Unrealized Loss | (466) | (2,913)
Available-for-sale securities, 12 Months or More, Fair Value | 54,313 | 3,753
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (9,227) | (378)
Available-for-sale securities, Fair Value | 61,935 | 48,208
Available-for-sale securities, Unrealized Loss | $ (9,693) | $ (3,291)

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