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INVESTMENT SECURITIES - Pledged Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale, Restricted [Abstract]    
Debt Securities, Available-for-sale, Restricted $ 0 $ 0
Debt Securities, Available-for-sale, Restriction Type us-gaap:AssetPledgedAsCollateralMember us-gaap:AssetPledgedAsCollateralMember