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Advances - Schedule of Activity in Advances (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Advances [Roll Forward]    
Beginning balance $ 828,239 $ 1,056,523
New advances 203,400 243,545
Sales of advances (133) (228)
Collections of advances and other (244,942) (277,585)
Net decrease (increase) in allowance for losses 114 2,552
Ending balance $ 786,678 $ 1,024,807