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SECURITIES - Total Available for Sale and Held to Maturity Investment Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Total securities    
Amortized Cost $ 531,687 $ 773,101
Gross Unrealized Gains 10,409 5,956
Gross Unrealized Losses (2,411) (5,739)
Total securities $ 539,685 $ 773,318