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SECURITIES - Carrying balances of securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
SECURITIES    
Debt securities available-for-sale $ 856,835 $ 922,869
Debt securities held-to-maturity Amortized Cost 192,994 68,395
Equity securities with readily determinable fair value 3,332 3,292
Equity securities with no readily determinable fair value 1,552 1,552
Total securities $ 1,054,713 $ 996,108