Balance Sheet Offsetting (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Offsetting Liabilities
Gross Amounts Recognized	$ 317,956	$ 450,487
Gross Amounts Offset	0	0
Net Amounts Presented	317,956	450,487
Gross Amounts Not Offset, Financial Instruments	(300,000)	(300,000)
Gross Amounts Not Offset, Cash Collateral	(11,602)	(150,487)
Net Amount	6,354	0
Repurchase agreements
Offsetting Repurchase Agreement Liabilities
Gross Amounts Recognized	300,000	300,000
Gross Amounts Offset	0	0
Net Amounts Presented	300,000	300,000
Gross Amounts Not Offset, Financial Instruments	(300,000)	(300,000)
Gross Amounts Not Offset, Cash Collateral	0	0
Net Amount	0	0
Interest rate swaps
Offsetting Assets
Gross Amounts Recognized	151,185	150,487
Gross Amounts Offset	0	0
Net Amounts Presented	151,185	150,487
Gross Amounts Not Offset, Financial Instruments	0
Gross Amounts Not Offset, Cash Collateral	0	0
Net Amount	151,185	150,487
Offsetting Liabilities
Gross Amounts Recognized	17,956	150,487
Gross Amounts Offset	0	0
Net Amounts Presented	17,956	150,487
Gross Amounts Not Offset, Financial Instruments	0
Gross Amounts Not Offset, Cash Collateral	(11,602)	(150,487)
Net Amount	$ 6,354	$ 0