Derivatives - Offsetting Arrangements (Loss) (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Derivative Asset [Abstract]
Derivative assets, gross amounts of recognized assets	$ 6,958
Derivative asset, gross amounts offset	(1,605)
Derivative assets, net amounts of assets	5,353
Derivative Liabilities [Abstract]
Derivative liabilities, gross amounts of liabilities	(11,910)
Derivative liabilities, gross amounts offset	1,605
Derivative liabilities, net amounts of liabilities	(10,305)
Derivative, net, gross amounts of assets/ liabilities	(4,952)
Derivatives, net amounts of assets/ liabilities	$ (4,952)