Derivatives - Offsetting Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Offsetting Assets [Line Items]
Gross Amounts	$ 199,073	$ 54,686
Gross Amounts Not Offset, Financial Instruments	(10,900)	(1,217)
Gross Amounts Not Offset, Cash Collateral	(157,493)	(41,715)
Total Net	30,680	11,754
Interest rate swap contracts
Offsetting Assets [Line Items]
Gross Amounts	187,661	34,588
Gross Amounts Not Offset, Financial Instruments	(7,185)	(866)
Gross Amounts Not Offset, Cash Collateral	(161,529)	(27,773)
Total Net	18,947	5,949
TBA Agency Securities
Offsetting Assets [Line Items]
Gross Amounts	11,412	20,098
Gross Amounts Not Offset, Financial Instruments	(3,715)	(351)
Gross Amounts Not Offset, Cash Collateral	4,036	(13,942)
Total Net	$ 11,733	$ 5,805