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SECURITIES - Carrying balances of securities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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SECURITIES |  |
Debt securities available-for-sale | $ 896,218 | $ 922,869
Debt securities held-to-maturity | 318,730 | 68,395
Equity securities with readily determinable fair value | 3,366 | 3,292
Equity securities with no readily determinable fair value | 1,867 | 1,552
Total securities | $ 1,220,181 | $ 996,108

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