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Derivatives and Risk Management - Schedule of Collateral Outstanding Related to Derivative Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Derivative [Line Items]    
Balance sheet offsetting $ 12,343 $ 8,666
Commodity Contracts [Member]    
Derivative [Line Items]    
Cash collateral posted 22,947 4,953
Letters of credit outstanding 21,500 23,500
Balance sheet offsetting 12,343 616
Interest Rate Swap [Member]    
Derivative [Line Items]    
Cash collateral posted 0 8,050
Liabilities with credit-risk-related contingent features 20,732 50,813
Additional collateral to post $ 20,732 $ 42,763