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Interest Income
 12 Months Ended
Dec. 31, 2018
Banking and Thrift, Interest [Abstract]  
Interest Income
Interest Income
Interest income was comprised of the following components for the years ended December 31 (in thousands):
 
2018
 
2017
 
2016
Interest on unpaid principal balance
$
440,753

 
$
382,983

 
$
300,713

Amortization of net deferred origination costs
(57,414
)
 
(48,540
)
 
(36,040
)
Interest income on loans, net
383,339

 
334,443

 
264,673

Interest on deposits
240

 
132

 
171

Total interest income
$
383,579

 
$
334,575

 
$
264,844