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SECURITIES - Carrying balances of securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
SECURITIES    
Securities available-for-sale, at fair value $ 618,120 $ 679,526
Securities held-to-maturity 99,861 121,715
Equity securities: Readily determinable fair value 3,251 3,081
Equity securities: No readily determinable fair value 1,185 180
Total securities $ 722,417 $ 804,502