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Other Assets - Schedule of Changes in allowance of Automotive Dealer Financing Notes (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 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 $ 2,767 $ 10,516 7,664 $ 4,371
Provision (512) (930) (265) 5,215
Net charge-offs and other (2,255) 0 (7,399) 0
Ending balance $ 0 $ 9,586 $ 0 $ 9,586