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SECURITIES - Carrying balances of securities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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SECURITIES |  |
Securities available-for-sale, at fair value | $ 592,404 | $ 679,526
Securities held-to-maturity | 88,477 | 121,715
Equity securities: Readily determinable fair value | 3,241 | 3,081
Equity securities: No readily determinable fair value | 1,148 | 180
Total securities | $ 685,270 | $ 804,502

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