Intangible Assets

The carrying amount of the Company's goodwill as of September 30, 2014 and December 31, 2013 was $105.4 million. There was no impairment of goodwill during the three and nine month periods ended September 30, 2014 and 2013.

Core deposit intangible assets are amortized over their estimated lives, which range from seven to ten years. The Company acquired, through the acquisitions of PIB and Foster during the first and third quarters of 2013, respectively, core deposit intangible assets, which totaled $603 thousand and $2.8 million, respectively. Amortization expense related to core deposit intangible assets totaled $324 thousand and $316 thousand for the three months ended September 30, 2014 and 2013, respectively. The amortization expense related to core deposit intangible assets totaled $972 thousand and $813 thousand for the nine months ended September 30, 2014 and 2013, respectively. The following table provides information regarding the core deposit intangibles at September 30, 2014:



		As of September 30, 2014
	Amortization period	Gross Carrying Amount		Accumulated Amortization

Core deposit—Center Financial Corporation acquisition	7 years	$	4,100	$	(2,504	)
Core deposit—PIB acquisition	7 years	603		(237		)
Core deposit—Foster acquisition	10 years	2,763		(514		)
Total		$	7,466	$	(3,255	)

Servicing assets are recognized when SBA loans are sold with servicing retained with the income statement effect recorded in gains on sales of SBA loans. Servicing assets are initially recorded at fair value based on the present value of the contractually specified servicing fee, net of servicing costs, over the estimated life of the loan, using a discount rate based on the related note rate. The Company's servicing costs approximates the industry average servicing costs of 40 basis points. All classes of servicing assets are subsequently measured using the amortization method which requires servicing rights to be amortized into noninterest income in proportion to, and over the period of, the estimated future net servicing income of the underlying loans.

Management periodically evaluates servicing assets for impairment based upon the fair value of the rights as compared to the carrying amount. Impairment is determined by stratifying rights into groupings based on loan type. Impairment is recognized through a valuation allowance for an individual grouping, to the extent that fair value is less than the carrying amount.

The changes in servicing assets for the three and nine months ended September 30, 2014 and 2013 were as follows:



	Three Months Ended September 30,						Nine Months Ended September 30,
	2014			2013			2014			2013
	(In thousands)
Balance at beginning of period	$	9,024		$	8,078		$	8,915		$	6,260
Additions through originations of servicing assets	1,270			977			2,943			2,535
Additions through acquisition of PIB	—			—			—			1,102
Additions through acquisition of Foster	—			162			—			162
Amortization	(771		)	(555		)	(2,335		)	(1,397		)
Balance at end of period	$	9,523		$	8,662		$	9,523		$	8,662

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 September 30, 2014 and December 31, 2013 are presented below.



	September 30, 2014	December 31, 2013
	Range	Range
Weighted-average discount rate	5.46% ~ 5.75%	5.49% ~ 5.73%
Constant prepayment rate	8.90% ~ 12.40%	9.20% ~13.00%