Balance Sheet Offsetting (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Offsetting Liabilities
Gross Amounts Recognized	$ 487,033	$ 393,733
Gross Amounts Offset	0	0
Net Amounts Presented	487,033	393,733
Gross Amounts Not Offset, Financial Instruments	(300,000)	(350,118)
Gross Amounts Not Offset, Cash Collateral	(184,050)	(16,881)
Net Amount	2,983	26,734
Repurchase agreements
Offsetting Repurchase Agreement Liabilities
Gross Amounts Recognized	300,000	350,000
Gross Amounts Offset	0	0
Net Amounts Presented	300,000	350,000
Gross Amounts Not Offset, Financial Instruments	(300,000)	(350,000)
Gross Amounts Not Offset, Cash Collateral	0	0
Net Amount	0	0
Interest rate swaps
Offsetting Assets
Gross Amounts Recognized	455,404	158,382
Gross Amounts Offset	0	0
Net Amounts Presented	455,404	158,382
Gross Amounts Not Offset, Financial Instruments	0	(118)
Gross Amounts Not Offset, Cash Collateral	0	0
Net Amount	455,404	158,264
Offsetting Liabilities
Gross Amounts Recognized	187,033	43,733
Gross Amounts Offset	0	0
Net Amounts Presented	187,033	43,733
Gross Amounts Not Offset, Financial Instruments	0	(118)
Gross Amounts Not Offset, Cash Collateral	(184,050)	(16,881)
Net Amount	$ 2,983	$ 26,734