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Goodwill, Intangible Assets, and Servicing Assets (Tables)
 3 Months Ended
Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Finite-Lived Intangible Assets
The following table provides information regarding the core deposit intangibles at March 31, 2017:
 
 
 
As of March 31, 2017
 
Amortization period
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
 
 
 (Dollars in thousands)
Core deposit—Center Financial acquisition
7 years
 
$
4,100

 
$
(3,755
)
Core deposit—PIB acquisition
7 years
 
604

 
(484
)
Core deposit—Foster acquisition
10 years
 
2,763

 
(1,417
)
Core deposit—Wilshire acquisition
10 years
 
18,138

 
(1,399
)
Total
 
 
$
25,605

 
$
(7,055
)
Schedule of Servicing Assets
The changes in servicing assets for the three months ended March 31, 2017 and 2016 were as follows:
 
 
Three Months Ended March 31,
 
 
2017
 
2016
 
 
(Dollars in thousands)
Balance at beginning of period
 
$
26,457

 
$
12,000

Additions through originations of servicing assets
 
1,296

 
777

Amortization
 
(1,812
)
 
(921
)
Balance at end of period
 
$
25,941

 
$
11,856
Summary of Fair Value Inputs
The inputs used in determining the impairment of the servicing assets at March 31, 2017 and December 31, 2016 are presented below.
 
 
March 31, 2017
 
December 31, 2016
SBA Servicing Assets:
 
 
 
 
Weighted-average discount rate
 
10.29%
 
9.85%
Constant prepayment rate
 
8.18%
 
8.05%
Mortgage Servicing Assets:
 
 
 
 
Weighted-average discount rate
 
9.66%
 
7.25%
Constant prepayment rate
 
7.71%
 
13.77%