Balance Sheet Offsetting (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Offsetting Liabilities
Gross Amounts Recognized	$ 182,833	$ 172,907
Gross Amounts Offset	0	0
Net Amounts Presented	182,833	172,907
Gross Amounts Not Offset, Financial Instruments	(13,385)	(1,214)
Gross Amounts Not Offset, Cash Collateral	(165,211)	(151,852)
Net Amount	4,237	19,841
Repurchase agreements
Offsetting Repurchase Agreement Liabilities
Gross Amounts Recognized	150,000	150,000
Gross Amounts Offset	0	0
Net Amounts Presented	150,000	150,000
Gross Amounts Not Offset, Financial Instruments	0	0
Gross Amounts Not Offset, Cash Collateral	(150,000)	(150,000)
Net Amount	0	0
Interest rate swaps
Offsetting Assets
Gross Amounts Recognized	139,893	48,642
Gross Amounts Offset	0	0
Net Amounts Presented	139,893	48,642
Gross Amounts Not Offset, Financial Instruments	(13,385)	(1,214)
Gross Amounts Not Offset, Cash Collateral	0	0
Net Amount	126,508	47,428
Offsetting Liabilities
Gross Amounts Recognized	32,833	22,907
Gross Amounts Offset	0	0
Net Amounts Presented	32,833	22,907
Gross Amounts Not Offset, Financial Instruments	(13,385)	(1,214)
Gross Amounts Not Offset, Cash Collateral	(15,211)	(1,852)
Net Amount	$ 4,237	$ 19,841