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Subsequent Events (Details) - Revolving Credit Facility - USD ($)
Jan. 23, 2018
Dec. 17, 2015
Subsequent Event [Line Items]    
Current borrowing capacity   $ 120,000,000.0
Warehouse Credit Agreement II | LendingClub Warehouse II LLC | Subsequent Event    
Subsequent Event [Line Items]    
Current borrowing capacity $ 200,000,000