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Fair Value of Assets and Liabilities - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Fair Value Disclosures [Abstract]        
Asset transfers, net $ 0 $ 0 $ 0 $ 0
Liability transfers, net $ 0 $ 0 $ 0 $ 0