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INVESTMENT SECURITIES - Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 312,805 | $ 147,033
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 11,669 | 2,019
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 38,737 | 26,881
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 4,333 | 1,266
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 351,542 | 173,914
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 16,002 | 3,285
Allowance for credit losses on securities | 0 |
HELD-TO-MATURITY SECURITIES: |  |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 4,492 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 151,979 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2,761 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 68,209 |
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 220,188 |
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss | 7,253 |
Agency mortgage-backed securities |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 244,661 | 47,769
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 9,337 | 388
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 10,583
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 356
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 244,661 | 58,352
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 9,337 | 744
HELD-TO-MATURITY SECURITIES: |  |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2,662 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 80,283 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 304 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 9,717 |
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 90,000 |
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss | 2,966 |
Agency collateralized mortgage obligations |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 25,813 | 92,727
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1,177 | 1,588
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 34,761 | 16,298
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 4,086 | 910
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 60,574 | 109,025
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 5,263 | 2,498
HELD-TO-MATURITY SECURITIES: |  |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1,772 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 70,764 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2,251 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 53,431 |
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 124,195 |
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss | 4,023 |
States and political subdivisions securities |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 17,527 | 6,537
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 179 | 43
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 3,976 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 247 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 21,503 | 6,537
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 426 | $ 43
HELD-TO-MATURITY SECURITIES: |  |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 58 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 932 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 206 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 5,061 |
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 5,993 |
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss | 264 |
Small Business Administration securities |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 24,804 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 976 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 24,804 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 976 |

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