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INVESTMENT SECURITIES - Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than Twelve Months, Fair Value | $ 441,334 | $ 147,033
Available-for-sale Securities, Less than 12 Months, Unrealized Loss | (59,004) | (2,019)
Available-for-sale securities, Twelve Months or Longer, Fair Value | 40,225 | 26,881
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (8,001) | (1,266)
Available-for-sale securities, Fair Value | 481,559 | 173,914
Available-for-sale securities, Unrealized Loss | (67,005) | (3,285)
Allowance for credit losses on securities | 0 |
HELD-TO-MATURITY SECURITIES: |  |
Held-to-maturity securities, Less than 12 Month, Fair Value | 123,396 |
Held-to-maturity securities, Less than 12 Months, Unrealized Losses | (15,164) |
Held-to-maturity securities, 12 Months or Longer, Fair Value | 57,015 |
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses | (10,910) |
Held-to-maturity securities, Fair Value | 180,411 |
Held-to-maturity securities, Unrealized Losses | (26,074) |
Agency mortgage-backed securities. |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than Twelve Months, Fair Value | 281,226 | 47,769
Available-for-sale Securities, Less than 12 Months, Unrealized Loss | (42,158) | (388)
Available-for-sale securities, Twelve Months or Longer, Fair Value | 7,027 | 10,583
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (1,244) | (356)
Available-for-sale securities, Fair Value | 288,253 | 58,352
Available-for-sale securities, Unrealized Loss | (43,402) | (744)
HELD-TO-MATURITY SECURITIES: |  |
Held-to-maturity securities, Less than 12 Month, Fair Value | 59,095 |
Held-to-maturity securities, Less than 12 Months, Unrealized Losses | (8,249) |
Held-to-maturity securities, 12 Months or Longer, Fair Value | 7,852 |
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses | (2,104) |
Held-to-maturity securities, Fair Value | 66,947 |
Held-to-maturity securities, Unrealized Losses | (10,353) |
Agency collateralized mortgage obligations |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than Twelve Months, Fair Value | 38,814 | 92,727
Available-for-sale Securities, Less than 12 Months, Unrealized Loss | (4,581) | (1,588)
Available-for-sale securities, Twelve Months or Longer, Fair Value | 31,962 | 16,298
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (6,550) | (910)
Available-for-sale securities, Fair Value | 70,776 | 109,025
Available-for-sale securities, Unrealized Loss | (11,131) | (2,498)
HELD-TO-MATURITY SECURITIES: |  |
Held-to-maturity securities, Less than 12 Month, Fair Value | 62,540 |
Held-to-maturity securities, Less than 12 Months, Unrealized Losses | (6,614) |
Held-to-maturity securities, 12 Months or Longer, Fair Value | 45,750 |
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses | (8,044) |
Held-to-maturity securities, Fair Value | 108,290 |
Held-to-maturity securities, Unrealized Losses | (14,658) |
States and political subdivisions securities |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than Twelve Months, Fair Value | 59,847 | 6,537
Available-for-sale Securities, Less than 12 Months, Unrealized Loss | (5,564) | (43)
Available-for-sale securities, Twelve Months or Longer, Fair Value | 1,236 |
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (207) |
Available-for-sale securities, Fair Value | 61,083 | 6,537
Available-for-sale securities, Unrealized Loss | (5,771) | $ (43)
HELD-TO-MATURITY SECURITIES: |  |
Held-to-maturity securities, Less than 12 Month, Fair Value | 1,761 |
Held-to-maturity securities, Less than 12 Months, Unrealized Losses | (301) |
Held-to-maturity securities, 12 Months or Longer, Fair Value | 3,413 |
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses | (762) |
Held-to-maturity securities, Fair Value | 5,174 |
Held-to-maturity securities, Unrealized Losses | (1,063) |
Small Business Administration securities |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than Twelve Months, Fair Value | 61,447 |
Available-for-sale Securities, Less than 12 Months, Unrealized Loss | (6,701) |
Available-for-sale securities, Fair Value | 61,447 |
Available-for-sale securities, Unrealized Loss | $ (6,701) |

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