Balance Sheet Offsetting (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Offsetting Liabilities
Gross Amounts Recognized	$ 510,394	$ 393,733
Gross Amounts Offset	0	0
Net Amounts Presented	510,394	393,733
Gross Amounts Not Offset, Financial Instruments	0	(118)
Gross Amounts Not Offset, Cash Collateral	(392,831)	(366,881)
Net Amount	117,563	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	0	0
Gross Amounts Not Offset, Cash Collateral	(350,000)	(350,000)
Net Amount	0	0
Interest rate swaps
Offsetting Assets
Gross Amounts Recognized	436,497	158,382
Gross Amounts Offset	0	0
Net Amounts Presented	436,497	158,382
Gross Amounts Not Offset, Financial Instruments	0	(118)
Gross Amounts Not Offset, Cash Collateral	0	0
Net Amount	436,497	158,264
Offsetting Liabilities
Gross Amounts Recognized	160,394	43,733
Gross Amounts Offset	0	0
Net Amounts Presented	160,394	43,733
Gross Amounts Not Offset, Financial Instruments	0	(118)
Gross Amounts Not Offset, Cash Collateral	(42,831)	(16,881)
Net Amount	$ 117,563	$ 26,734