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Interest Income (Tables)
 12 Months Ended
Dec. 31, 2017
Other Income and Expenses [Abstract]  
Schedule of Components of Interest Income
 
Years Ended December 31,
 
2017
 
2016
 
2015
Loans held for sale
$
11,100

 
$
15,774

 
$
16,167

Automotive dealer financing notes
3,069

 
1,534

 
39

Interest earning cash deposits and other
1,796

 
1,775

 
2,114

 
$
15,965

 
$
19,083

 
$
18,320