Repurchase Agreements - Remaining Term to Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	$ 6,423,890	$ 5,381,104
Weighted Average Rate	5.40%	5.59%
WAVG Original Term to Maturity	68	89
Less than 30 days
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	$ 4,403,523	$ 2,855,917
Weighted Average Rate	5.39%	5.61%
WAVG Original Term to Maturity	59	92
30 to 90 days
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	$ 2,020,367	$ 2,525,187
Weighted Average Rate	5.40%	5.58%
WAVG Original Term to Maturity	89	86