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Goodwill and Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Intangible Assets and Goodwill

A summary of the other intangible assets that continue to be subject to amortization is as follows:

 

    As of December 31, 2018  
(Dollars in thousands)   Gross carrying amount     Accumulated amortization     Net carrying amount  
Core deposit intangible assets   $ 2,067     $ (1,588 )   $ 479  
Lease intangible asset     350       (233 )     117  
Mortgage servicing rights     6,545       (4,050 )     2,495  
Total other intangible assets   $ 8,962     $ (5,871 )   $ 3,091  

 

    As of December 31, 2017  
    Gross carrying amount     Accumulated amortization     Net carrying amount  
Core deposit intangible assets   $ 2,067     $ (1,381 )   $ 686  
Lease intangible asset     350       (188 )     162  
Mortgage servicing rights     6,285       (3,474 )     2,811  
Total other intangible assets   $ 8,702     $ (5,043 )   $ 3,659  
Schedule of Finite-lived Intangible Assets, Future Amortization Expense

The following sets forth estimated amortization expense for core deposit and lease intangible assets for the years ending December 31:

 

      Amortization  
(Dollars in thousands)     expense  
2019            214  
2020       177  
2021       121  
2022       58  
2023       26  
Total     $ 596  
Schedule of Participating Mortgage Loans

The following table provides information on the principal balances of mortgage loans serviced for others:

 

    As of December 31,  
(Dollars in thousands)    2018     2017  
FHLMC   $ 521,489     $ 517,863  
FHLB     10,603       9,782  
Schedule of Servicing Asset at Amortized Cost

Activity for mortgage servicing rights and the related valuation allowance follows:

 

    As of December 31,  
(Dollars in thousands)    2018     2017  
Mortgage servicing rights:                
Balance at beginning of year   $ 2,811     $ 2,849  
Additions     543       931  
Amortization     (859 )     (969 )
Balance at end of year   $ 2,495     $ 2,811