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INVESTMENT SECURITIES - Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 86,603 | $ 24,170
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1,977) | (1,212)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 12,418 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (674) |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 99,021 | 24,170
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (2,651) | (1,212)
Allowance for credit losses on securities | 0 |
Agency mortgage-backed securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 10,084 | 10,279
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (898) | (831)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 10,084 | 10,279
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (898) | (831)
Agency collateralized mortgage obligations |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 67,941 | 12,727
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (963) | (375)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 12,418 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (674) |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 80,359 | 12,727
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (1,637) | (375)
States and political subdivisions securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 8,578 | 1,164
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (116) | (6)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 8,578 | 1,164
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (116) | $ (6)

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