reassessed all loan restructurings that occurred on or after January 1, 2011. Adoption of ASU 2011-02 did not have a  significant impact on the Company’s consolidated financial statements. The Company tests goodwill for impairment annually or more frequently if circumstances warrant. The Company  performed its annual step one impairment test as of December 31, 2012. The fair value of the Company’s single reporting  unit was determined using the Company’s market capitalization adjusted for an appropriate control premium, as well as a  review of valuation multiples of recent financial industry acquisitions for similar institutions, to estimate the fair value of the  Company’s single reporting unit. The fair value was compared to the carrying value of the single reporting unit at the  measurement date to determine if any impairment existed. Based on the results of the December 31, 2012 step one  impairment test, the Company concluded its goodwill was not impaired. The Company can make no assurances that future  impairment tests will not result in goodwill impairments.  On April 1, 2012, the Company’s subsidiary, Landmark National Bank, assumed approximately $35.0 million in  deposits in connection with the acquisition of the Wellsville Bank. The Company identified $24.7 million of core deposits  and recorded a core deposit intangible asset of $308,000 as a result of the acquisition. The core deposit intangible asset will  be amortized over its estimated useful life of ten years on an accelerated basis. A summary of the other intangible assets  that continue to be subject to amortization is as follows:  During 2012, the Company recorded a $212,000 valuation allowance against its mortgage servicing rights. The  continual decline in mortgage rates decreased the estimated fair value of these assets as it became more likely that some the  loans we serve will be refinanced.  Estimated amortization expense for the years ending December 31 is as follows:  (Dollars in thousands) Amortization expense 2013 891 $ 2014 801 2015 568 2016 38 2017 32 Thereafter 64 Total 2,394 $ 73  (Dollars in thousands) Gross carrying  amount Accumulated  amortization Valuation  allowance Net carrying  amount Core deposit intangible assets  $ 4,973 $ (4,258)  $ - $ 715  Mortgage servicing rights 3,038 (1,147) (212) 1,679  Total other intangible assets  $ 8,011 $ (5,405) $ (212)  $ 2,394  Gross carrying  amount Accumulated  amortization Net carrying  amount Core deposit intangible assets  $ 4,665 $ (3,902)  $ - $ 763  Mortgage servicing rights 2,149 (989) - 1,160  Total other intangible assets  $ 6,814 $ (4,891)  $ - $ 1,923  As of December 31, 2011 As of December 31, 2012 (2) Goodwill and Intangible Assets 