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INVESTMENT SECURITIES - Fair value and unrealized losses on investments (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than 12 Months, Fair Value | $ 85,325 | $ 355,027
Available-for-sale Securities, Less than 12 Months, Unrealized Loss | (4,687) | (38,996)
Available-for-sale securities, 12 Months or More, Fair Value | 382,402 | 116,980
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (49,274) | (23,745)
Available-for-sale securities, Fair Value | 467,727 | 472,007
Available-for-sale securities, Unrealized Loss | (53,961) | (62,741)
HELD-TO-MATURITY SECURITIES: |  |
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, Fair Value | 179,853 | 56,592
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses | (20,574) | (10,452)
Held-to-maturity securities, Fair Value | 179,853 | 177,765
Held-to-maturity securities, Unrealized Losses | (20,574) | (24,730)
Agency mortgage-backed securities. |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than 12 Months, Fair Value | 28,167 | 221,562
Available-for-sale Securities, Less than 12 Months, Unrealized Loss | (2,019) | (27,597)
Available-for-sale securities, 12 Months or More, Fair Value | 259,221 | 64,918
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (34,064) | (13,187)
Available-for-sale securities, Fair Value | 287,388 | 286,480
Available-for-sale securities, Unrealized Loss | (36,083) | (40,784)
HELD-TO-MATURITY SECURITIES: |  |
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, Fair Value | 68,235 | 7,868
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses | (8,247) | (2,054)
Held-to-maturity securities, Fair Value | 68,235 | 67,086
Held-to-maturity securities, Unrealized Losses | (8,247) | (9,820)
Agency collateralized mortgage obligations |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than 12 Months, Fair Value | 20,534 | 28,537
Available-for-sale Securities, Less than 12 Months, Unrealized Loss | (826) | (3,262)
Available-for-sale securities, 12 Months or More, Fair Value | 59,226 | 40,642
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (9,088) | (8,469)
Available-for-sale securities, Fair Value | 79,760 | 69,179
Available-for-sale securities, Unrealized Loss | (9,914) | (11,731)
HELD-TO-MATURITY SECURITIES: |  |
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, Fair Value | 105,992 | 44,178
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses | (11,735) | (7,718)
Held-to-maturity securities, Fair Value | 105,992 | 105,233
Held-to-maturity securities, Unrealized Losses | (11,735) | (14,129)
States and political subdivisions securities |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than 12 Months, Fair Value | 18,117 | 60,473
Available-for-sale Securities, Less than 12 Months, Unrealized Loss | (597) | (5,224)
Available-for-sale securities, 12 Months or More, Fair Value | 22,548 | 7,667
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (1,409) | (1,711)
Available-for-sale securities, Fair Value | 40,665 | 68,140
Available-for-sale securities, Unrealized Loss | (2,006) | (6,935)
HELD-TO-MATURITY SECURITIES: |  |
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, Fair Value | 5,626 | 4,546
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses | (592) | (680)
Held-to-maturity securities, Fair Value | 5,626 | 5,446
Held-to-maturity securities, Unrealized Losses | (592) | (781)
Small Business Administration securities |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than 12 Months, Fair Value | 18,507 | 44,455
Available-for-sale Securities, Less than 12 Months, Unrealized Loss | (1,245) | (2,913)
Available-for-sale securities, 12 Months or More, Fair Value | 41,407 | 3,753
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (4,713) | (378)
Available-for-sale securities, Fair Value | 59,914 | 48,208
Available-for-sale securities, Unrealized Loss | $ (5,958) | $ (3,291)

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