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Goodwill and Other Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2019
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, 2019 
   Gross carrying amount   Accumulated amortization   Net carrying amount 
Core deposit intangible assets  $2,018   $(1,626)  $392 
Lease intangible asset   350    (256)   94 
Mortgage servicing rights   6,667    (4,295)   2,372 
Total other intangible assets  $9,035   $(6,177)  $2,858 

 

(Dollars in thousands)  As of December 31, 2018 
   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 
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 2019 and in successive years ending December 31:

 

  Amortization 
(Dollars in thousands)  expense 
Remainder of 2019  $104 
2020   177 
2021   121 
2022   58 
2023   26 
Total  $486 
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, 2019   December 31, 2018 
FHLMC  $513,673   $521,489 
FHLB   20,744    10,603 
Total  $534,417   $532,092 
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, 
   2019   2018   2019   2018 
Mortgage servicing rights:                    
Balance at beginning of period  $2,384   $2,722   $2,495   $2,811 
Additions   225    137    322    259 
Amortization   (237)   (220)   (445)   (431)
Balance at end of period  $2,372   $2,639   $2,372   $2,639