Derivatives - Offsetting Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Offsetting Assets [Line Items]
Gross Amounts	$ 543,229	$ 199,073
Gross Amounts Not Offset, Financial Instruments	(531)	(10,900)
Gross Amounts Not Offset, Cash Collateral	(463,654)	(157,493)
Total Net	79,044	30,680
Interest rate swap contracts
Offsetting Assets [Line Items]
Gross Amounts	539,979	187,661
Gross Amounts Not Offset, Financial Instruments	0	(7,185)
Gross Amounts Not Offset, Cash Collateral	(463,679)	(161,529)
Total Net	76,300	18,947
TBA Agency Securities
Offsetting Assets [Line Items]
Gross Amounts	3,250	11,412
Gross Amounts Not Offset, Financial Instruments	(531)	(3,715)
Gross Amounts Not Offset, Cash Collateral	25	4,036
Total Net	$ 2,744	$ 11,733