Repurchase Agreements - Remaining Term to Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Balance	$ 2,202,648	$ 2,849,916
Weighted Average Rate	1.30%	0.23%
WAVG Original Term to Maturity	101	198
Less than 30 days
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Balance	$ 1,742,085	$ 602,994
Weighted Average Rate	1.46%	0.42%
WAVG Original Term to Maturity	53	123
30 to 90 days
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Balance	$ 211,447	$ 763,302
Weighted Average Rate	1.03%	0.14%
WAVG Original Term to Maturity	187	166
91 to 180 days
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Balance	$ 249,116	$ 1,075,324
Weighted Average Rate	0.38%	0.15%
WAVG Original Term to Maturity	365	198
181 days to 1 year
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Balance	$ 0	$ 408,296
Weighted Average Rate	0.00%	0.30%
WAVG Original Term to Maturity	0	366