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Derivatives and Risk Management - Schedule of Collateral Outstanding Related to Derivative Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Derivative [Line Items]    
Balance sheet offsetting $ 6,696 $ 8,666
Commodity Contracts [Member]    
Derivative [Line Items]    
Cash collateral posted 7,596 4,953
Letters of credit outstanding 12,500 23,500
Balance sheet offsetting 2,786 616
Interest Rate Swap [Member]    
Derivative [Line Items]    
Cash collateral posted 3,910 8,050
Liabilities with credit-risk-related contingent features 14,956 50,813
Additional collateral to post $ 11,046 $ 42,763