Repurchase Agreements - Remaining Term to Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	$ 11,753,522	$ 6,563,120
Weighted Average Rate	4.44%	4.80%
WAVG Original Term to Maturity	100	79
Less than 30 days
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	$ 7,845,206	$ 1,742,440
Weighted Average Rate	4.44%	4.83%
WAVG Original Term to Maturity	86	68
30 to 90 days
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	$ 3,130,470	$ 4,820,680
Weighted Average Rate	4.44%	4.78%
WAVG Original Term to Maturity	117	83
Maturity Greater than 90 Days
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	$ 777,846	$ 0
Weighted Average Rate	4.42%	0.00%
WAVG Original Term to Maturity	177	0