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Interest Income (Tables)
 12 Months Ended
Dec. 31, 2016
Banking and Thrift, Interest [Abstract]  
Summary of Interest Income
Interest income was comprised of the following components for the years ended December 31 (in thousands):
 
2016
 
2015
 
2014
Interest on unpaid principal balance
$
300,713

 
$
227,579

 
$
172,472

Interest on deposits
171

 
408

 
70

Amortization of net deferred origination costs
(36,040
)
 
(32,939
)
 
(27,267
)
Total interest income
$
264,844

 
$
195,048

 
$
145,275