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SECURITIES - Carrying balances of securities (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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SECURITIES |  |
Debt securities available-for-sale | $ 933,922 | $ 942,168
Debt securities held-to-maturity | 438,054 | 336,185
Equity securities with readily determinable fair value | 3,256 | 3,443
Equity securities with no readily determinable fair value | 1,927 | 1,927
Total securities | $ 1,377,159 | $ 1,283,723

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