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SECURITIES - Amortized cost and Fair values of held-to-maturity securities transferred from available-for-sale securities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Held-to-maturity |  |  |
Debt securities held-to-maturity | $ 318,730 |  | $ 68,395
Fair Value | 321,156 |  | 72,441
U.S. government agency |  |  |
Held-to-maturity |  |  |
Debt securities held-to-maturity | 12,341 |  |
Fair Value | 12,453 |  |
Mortgage-backed: Agency residential |  |  |
Held-to-maturity |  |  |
Debt securities held-to-maturity | 22,065 |  | 13,031
Fair Value | 22,418 |  | 13,483
Mortgage-backed: Agency commercial |  |  |
Held-to-maturity |  |  |
Debt securities held-to-maturity | 265,657 |  | 32,880
Fair Value | 266,620 |  | $ 35,084
Debt Securities Transferred |  |  |
Held-to-maturity |  |  |
Debt securities held-to-maturity | 99,271 | $ 135,161 |
Fair Value | 99,275 | 129,720 |
Debt Securities Transferred | U.S. government agency |  |  |
Held-to-maturity |  |  |
Debt securities held-to-maturity |  | 7,593 |
Fair Value |  | 7,323 |
Debt Securities Transferred | Mortgage-backed: Agency residential |  |  |
Held-to-maturity |  |  |
Debt securities held-to-maturity |  | 8,776 |
Fair Value |  | 8,536 |
Debt Securities Transferred | Mortgage-backed: Agency commercial |  |  |
Held-to-maturity |  |  |
Debt securities held-to-maturity | 99,271 | 118,792 |
Fair Value | $ 99,275 | $ 113,861 |

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