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Other Assets - Schedule of Changes in allowance of Automotive Dealer Financing Notes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Beginning balance     $ 7,700  
Automotive Dealer Financing Notes [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Beginning balance $ 0 $ 9,586 7,664 $ 4,371
Provision 0 (1,019) (265) 4,196
Net charge-offs and other 0 0 (7,399) 0
Ending balance $ 0 $ 8,567 $ 0 $ 8,567