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Other Assets - Schedule of Changes in allowance of Automotive Dealer Financing Notes (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning balance $ 7,700  
Ending balance 2,800  
Automotive Dealer Financing Notes [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning balance 7,664 $ 4,371
Provision 247 6,145
Net charge-offs and other (5,144) 0
Ending balance $ 2,767 $ 10,516