Repurchase Agreements - Remaining Term to Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	$ 5,284,708	$ 5,381,104
Weighted Average Rate	5.46%	5.59%
WAVG Original Term to Maturity	76	89
Less than 30 days
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	$ 2,440,188	$ 2,855,917
Weighted Average Rate	5.48%	5.61%
WAVG Original Term to Maturity	58	92
30 to 90 days
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	$ 2,305,208	$ 2,525,187
Weighted Average Rate	5.46%	5.58%
WAVG Original Term to Maturity	71	86
91 to 180 days
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	$ 539,312	$ 0
Weighted Average Rate	5.42%	0.00%
WAVG Original Term to Maturity	182	0