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INVESTMENT SECURITIES - Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Thousands | Jun. 30, 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 | $ 483,312 | $ 147,033
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 34,341 | 2,019
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 10,479 | 26,881
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2,602 | 1,266
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 493,791 | 173,914
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 36,943 | 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 | 13,781 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 181,344 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2,320 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 17,909 |
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 199,253 |
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss | 16,101 |
Agency mortgage-backed securities |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 303,739 | 47,769
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 24,000 | 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 | 303,739 | 58,352
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 24,000 | 744
HELD-TO-MATURITY SECURITIES: |  |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 4,925 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 69,001 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,551 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 8,437 |
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 77,438 |
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss | 6,476 |
Agency collateralized mortgage obligations |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 64,794 | 92,727
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 5,116 | 1,588
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 10,479 | 16,298
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2,602 | 910
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 75,273 | 109,025
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 7,718 | 2,498
HELD-TO-MATURITY SECURITIES: |  |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 8,439 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 109,116 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 477 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 7,161 |
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 116,277 |
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss | 8,916 |
States and political subdivisions securities |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 48,137 | 6,537
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2,337 | 43
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 48,137 | 6,537
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 2,337 | $ 43
HELD-TO-MATURITY SECURITIES: |  |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 417 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 3,227 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 292 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 2,311 |
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 5,538 |
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss | 709 |
Small Business Administration securities |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 66,642 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2,888 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 66,642 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 2,888 |

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