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SECURITIES - Carrying balances of securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
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