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Related Party Transactions - Narrative (Details) - Employees Other Than Executive Officers - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Related Party Transaction [Line Items]    
Loans to related parties $ 424.2 $ 416.7
Maximum    
Related Party Transaction [Line Items]    
Related party transaction, rate 3.25%