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Borrowings under Repurchase Agreements Borrowings under Repurchase Agreements Schedule of Repurchase Agreement by Counterparty (Details)
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Repurchase Agreement Counterparty [Line Items]    
Repurchase Agreement Counterparty Concentration Risk Threshold 10.00%  
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements 161 days 48 days