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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 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Held-to-maturity |  |
Debt securities held-to-maturity Amortized Cost | $ 192,994 | $ 68,395
Fair Value | 195,608 | 72,441
U.S. government agency |  |
Held-to-maturity |  |
Debt securities held-to-maturity Amortized Cost | 7,323 |
Fair Value | 7,323 |
Mortgage-backed: Agency residential |  |
Held-to-maturity |  |
Debt securities held-to-maturity Amortized Cost | 20,335 | 13,031
Fair Value | 20,723 | 13,483
Mortgage-backed: Agency commercial |  |
Held-to-maturity |  |
Debt securities held-to-maturity Amortized Cost | 144,269 | 32,880
Fair Value | 145,307 | $ 35,084
Debt Securities Transferred |  |
Held-to-maturity |  |
Debt securities held-to-maturity Amortized Cost | 135,161 |
Fair Value | 129,720 |
Debt Securities Transferred | U.S. government agency |  |
Held-to-maturity |  |
Debt securities held-to-maturity Amortized Cost | 7,593 |
Fair Value | 7,323 |
Debt Securities Transferred | Mortgage-backed: Agency residential |  |
Held-to-maturity |  |
Debt securities held-to-maturity Amortized Cost | 8,776 |
Fair Value | 8,536 |
Debt Securities Transferred | Mortgage-backed: Agency commercial |  |
Held-to-maturity |  |
Debt securities held-to-maturity Amortized Cost | 118,792 |
Fair Value | $ 113,861 |

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