Derivative Instruments - Offsetting Derivatives (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Offsetting Derivative Assets
Gross amounts recognized	$ 61	$ 1,620
Gross amounts offset in the consolidated balance sheets	0	0
Net amounts presented in the consolidated balance sheets	61	1,620
Financial instruments	61	1,620
Financial collateral pledged	0	0
Net amounts	0	0
Offsetting Derivative Liabilities
Gross amounts recognized	9,974	6,768
Gross amounts offset in the consolidated balance sheets	0	0
Net amounts presented in the consolidated balance sheets	9,974	6,768
Financial instruments	61	1,620
Financial collateral pledged	8,698	2,745
Net amounts	$ 1,215	$ 2,403

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