Balance Sheet Offsetting (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Offsetting Liabilities
Gross Amounts Recognized	$ 65,212	$ 450,487
Gross Amounts Offset	0	0
Net Amounts Presented	65,212	450,487
Gross Amounts Not Offset, Financial Instruments	0	(300,000)
Gross Amounts Not Offset, Cash Collateral	(60,177)	(150,487)
Net Amount	5,035	0
Repurchase agreements
Offsetting Repurchase Agreement Liabilities
Gross Amounts Recognized		300,000
Gross Amounts Offset		0
Net Amounts Presented		300,000
Gross Amounts Not Offset, Financial Instruments		(300,000)
Gross Amounts Not Offset, Cash Collateral		0
Net Amount		0
Interest rate swaps
Offsetting Assets
Gross Amounts Recognized	215,046	150,487
Gross Amounts Offset	0	0
Net Amounts Presented	215,046	150,487
Gross Amounts Not Offset, Financial Instruments	0	0
Gross Amounts Not Offset, Cash Collateral	0	0
Net Amount	215,046	150,487
Offsetting Liabilities
Gross Amounts Recognized	65,212	150,487
Gross Amounts Offset	0	0
Net Amounts Presented	65,212	150,487
Gross Amounts Not Offset, Financial Instruments	0	0
Gross Amounts Not Offset, Cash Collateral	(60,177)	(150,487)
Net Amount	$ 5,035	$ 0