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Risk Management and Derivatives (Fair Value of Derivative Financial Instruments) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Derivative financial instruments on consolidated balance sheets    
Expected amount related to cash flow hedge that will be reclassified over next twelve months $ 10,300  
Designated as hedge    
Derivative financial instruments on consolidated balance sheets    
Derivative assets, fair value 0 $ 114
Derivative liabilities, fair value 18,926 8,680
Designated as hedge | Interest rate swaps | Other assets    
Derivative financial instruments on consolidated balance sheets    
Derivative assets, fair value 0 114
Designated as hedge | Interest rate swaps | Other liabilities    
Derivative financial instruments on consolidated balance sheets    
Derivative liabilities, fair value $ 18,926 $ 8,680