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SECURITIES - Carrying balances of securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
SECURITIES    
Debt securities available-for-sale, at fair value $ 922,869 $ 592,404
Debt securities held-to-maturity 68,395 88,477
Equity securities, Readily determinable fair value 3,292 3,241
Equity securities: No readily determinable fair value 1,552 1,148
Total securities $ 996,108 $ 685,270