Repurchase Agreements - Remaining Term to Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	$ 5,002,230	$ 2,644,405
Weighted Average Rate	5.47%	4.18%
WAVG Original Term to Maturity	93	84
Less than 30 days
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	$ 2,096,037	$ 858,161
Weighted Average Rate	5.46%	4.44%
WAVG Original Term to Maturity	77	42
30 to 90 days
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	$ 2,374,991	$ 1,786,244
Weighted Average Rate	5.44%	4.06%
WAVG Original Term to Maturity	102	104
91 to 180 days
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	$ 531,202	$ 0
Weighted Average Rate	5.64%	0.00%
WAVG Original Term to Maturity	113	0