Balance Sheet Offsetting (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Offsetting Liabilities
Gross Amounts Recognized	$ 516,866	$ 393,733
Gross Amounts Offset	0	0
Net Amounts Presented	516,866	393,733
Gross Amounts Not Offset, Financial Instruments	(350,000)	(350,118)
Gross Amounts Not Offset, Cash Collateral	(166,866)	(16,881)
Net Amount	0	26,734
Repurchase agreements
Offsetting Repurchase Agreement Liabilities
Gross Amounts Recognized	350,000	350,000
Gross Amounts Offset	0	0
Net Amounts Presented	350,000	350,000
Gross Amounts Not Offset, Financial Instruments	(350,000)	(350,000)
Gross Amounts Not Offset, Cash Collateral	0
Net Amount	0	0
Interest rate swaps
Offsetting Assets
Gross Amounts Recognized	467,606	158,382
Gross Amounts Offset	0	0
Net Amounts Presented	467,606	158,382
Gross Amounts Not Offset, Financial Instruments	0	(118)
Gross Amounts Not Offset, Cash Collateral	0	0
Net Amount	467,606	158,264
Offsetting Liabilities
Gross Amounts Recognized	166,866	43,733
Gross Amounts Offset	0	0
Net Amounts Presented	166,866	43,733
Gross Amounts Not Offset, Financial Instruments	0	(118)
Gross Amounts Not Offset, Cash Collateral	(166,866)	(16,881)
Net Amount	$ 0	$ 26,734