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Goodwill and Other Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 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:

 

(Dollars in thousands)   As of June 30, 2018  
    Gross carrying amount     Accumulated amortization     Net carrying amount  
Core deposit intangible assets   $ 2,067     $ (1,487 )   $ 580  
Lease intangible asset     350       (211 )     139  
Mortgage servicing rights     6,410       (3,771 )     2,639  
Total other intangible assets   $ 8,827     $ (5,469 )   $ 3,358  

 

(Dollars in thousands)   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 remainder of 2018 and in successive years ending December 31:

 

(Dollars in thousands)   Amortization  
    expense  
Remainder of 2018   $ 123  
2019     214  
2020     177  
2021     121  
2022     58  
Thereafter     26  
Total   $ 719  
Schedule of Participating Mortgage Loans

Mortgage loans serviced for others are not reported as assets. The following table provides information on the principal balances of mortgage loans serviced for others:

 

(Dollars in thousands)   June 30,     December 31,  
    2018     2017  
FHLMC   $ 520,587     $ 517,863  
FHLB     9,324       9,782  
Total   $ 529,911     $ 527,645  
Schedule of Servicing Asset at Amortized Cost

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

 

(Dollars in thousands)   Three months ended June 30,     Six months ended June 30,  
    2018     2017     2018     2017  
Mortgage servicing rights:                                
Balance at beginning of period   $ 2,722     $ 2,787     $ 2,811     $ 2,849  
Additions     137       281       259       442  
Amortization     (220 )     (255 )     (431 )     (478 )
Balance at end of period   $ 2,639     $ 2,813     $ 2,639     $ 2,813