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Derivative Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Customers    
Derivative Asset    
Estimated Fair Value $ 15,400 $ 25,400
Third Parties    
Derivative Asset    
Estimated Fair Value   (25,900)
Derivative Liability    
Estimated Fair Value (15,600)  
Interest rate swap    
Derivative Asset    
Estimated Fair Value 19,342  
Derivative Liability    
Estimated Fair Value (19,510)  
Interest rate swap | Non-hedging interest rate derivatives    
Derivative Asset    
Notional Amounts 321,519 308,126
Estimated Fair Value   25,740
Derivative Liability    
Notional Amounts $ 321,519 308,126
Estimated Fair Value   $ (26,162)