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Servicing Assets (Tables)
12 Months Ended
Dec. 31, 2017
Transfers and Servicing [Abstract]  
Servicing Asset at Amortized Cost
The changes in net servicing assets for the year ended December 31, 2017 and 2016 were as follows:
 
Year Ended December 31,
 
2017
 
2016
 
(Dollars in thousands)
Balance at beginning of period
$
26,457

 
$
12,000

Additions through originations of servicing assets
5,492

 
4,472

Additions through acquisition of Wilshire (net of servicing liabilities)

 
15,873

Amortization
(7,239
)
 
(5,888
)
Balance at end of period
$
24,710

 
$
26,457

Schedule of Servicing Assets at Fair Value
Total servicing assets at December 31, 2017 totaled $24.7 million, and was comprised of $22.2 million in SBA servicing assets and $2.5 million in mortgage related servicing assets. At December 31, 2016, servicing assets totaled $26.5 million, comprised of $24.7 million in SBA servicing assets and $1.8 million in mortgage related servicing assets.
The Company utilizes the discounted cash flow method to calculate the initial excess servicing assets. The inputs used in determining the fair value of the servicing assets at December 31, 2017 and December 31, 2016 are presented below.
 
 
December 31, 2017
 
December 31, 2016
 
 
Range
 
Range
SBA Servicing Assets:
 
 
 
 
Weighted-average discount rate
 
10.13% ~ 11.13%
 
5.55% ~ 9.85%
Constant prepayment rate
 
7.50% ~ 12.50%
 
7.20% ~ 12.10%
Mortgage Servicing Assets:
 
 
 
 
Weighted-average discount rate
 
9.50% ~ 9.66%
 
7.00% ~ 7.25%
Constant prepayment rate
 
7.71% ~ 9.13%
 
13.77% ~ 15.88%