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OFFSETTING ASSETS AND LIABILITIES - NARRATIVE (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Offsetting [Abstract]      
Fair value of securities re-pledged $ 7,517,000 $ 4,632,600 $ 896,200
Security collateral received $ 727 $ 361 $ 425