Repurchase Agreements - Remaining Term to Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Balance	$ 2,952,802	$ 2,849,916
Weighted Average Rate	0.31%	0.23%
WAVG Original Term to Maturity	148	198
Less than 30 days
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Balance	$ 1,567,265	$ 602,994
Weighted Average Rate	0.36%	0.42%
WAVG Original Term to Maturity	88	123
30 to 90 days
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Balance	$ 977,241	$ 763,302
Weighted Average Rate	0.24%	0.14%
WAVG Original Term to Maturity	154	166
91 to 180 days
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Balance	$ 159,180	$ 1,075,324
Weighted Average Rate	0.16%	0.15%
WAVG Original Term to Maturity	367	198
181 days to 1 year
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Balance	$ 249,116	$ 408,296
Weighted Average Rate	0.38%	0.30%
WAVG Original Term to Maturity	365	366