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Financing Receivables - Summary of Troubled Debt Restructurings (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
loan
Jun. 30, 2017
USD ($)
loan
Receivables [Abstract]    
Number of Financing Receivable Accounts | loan 326 326
Pre-Modification Balance Outstanding $ 1,092 $ 1,466
Post-Modification Balance Outstanding $ 1,036 $ 1,336
Number of Financing Receivable Accounts, subsequent defaults | loan 104 124
Balance at Default, subsequent defaults $ 351 $ 531