Derivative Instruments - Gross and Net Derivative Positions, Including Pledged Collateral (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Offsetting Derivative Assets
Gross amounts recognized	$ 527	$ 61
Gross amounts offset in the Consolidated Balance Sheets	0	0
Net amounts presented in the Consolidated Balance Sheets	527	61
Financial instruments	527	61
Financial collateral pledged	0	0
Net amounts	0	0
Offsetting Derivative Liabilities
Gross amounts recognized	23,198	9,974
Gross amounts offset in the Consolidated Balance Sheets	0	0
Net amounts presented in the Consolidated Balance Sheets	23,198	9,974
Financial instruments	527	61
Financial collateral pledged	18,400	8,698
Net amounts	$ 4,271	$ 1,215

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