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Allowance for Credit Losses - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Jan. 01, 2020
New Accounting Pronouncements or Change in Accounting Principle      
Change in allowance for credit losses $ (4,380) $ 149,508  
Cumulative Effect, Period of Adoption, Adjustment      
New Accounting Pronouncements or Change in Accounting Principle      
Allowance for credit losses     $ 309,400
Credit allowance percentage     2.88%