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Financial Instruments - Notional Amounts of Derivatives (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Forward sales commitments    
Derivative [Line Items]    
Notional Amounts $ 105,107 $ 130,109
IRLCs    
Derivative [Line Items]    
Notional Amounts $ 111,753 $ 88,923