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Goodwill and Other Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Other Intangible Assets and Goodwill

Lease intangible assets are amortized over the life of the lease. Core deposit intangible assets are amortized over the estimated useful life of ten years on an accelerated basis. Mortgage servicing rights are amortized over the estimated life of the mortgage loan serviced for others. A summary of the other intangible assets that continue to be subject to amortization is as follows:

 

 

(Dollars in thousands)  As of June 30, 2020 
    Gross carrying amount    Accumulated amortization    Net carrying amount 
Core deposit intangible assets  $2,018   $(1,776)  $242 
Lease intangible asset   350    (301)   49 
Mortgage servicing rights   7,349    (4,543)   2,806 
Total other intangible assets  $9,717   $(6,620)  $3,097 
                
(Dollars in thousands)   As of December 31, 2019 
    Gross carrying amount    Accumulated amortization    Net carrying amount 
Core deposit intangible assets  $2,018   $(1,707)  $311 
Lease intangible asset   350    (278)   72 
Mortgage servicing rights   6,910    (4,464)   2,446 
Total other intangible assets  $9,278   $(6,449)  $2,829 
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 2020 and in successive years ending December 31:

 

 

(Dollars in thousands)  Amortization 
   expense 
Remainder of 2020  $86 
2021   121 
2022   58 
2023   26 
Total  $291 
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, 
   2020   2019 
FHLMC  $547,190   $509,101 
FHLB   39,519    40,462 
Total  $586,709   $549,563 
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, 
   2020   2019   2020   2019 
Mortgage servicing rights:                    
Balance at beginning of period  $2,428   $2,384   $2,446   $2,495 
Additions   757    225    969    322 
Amortization   (379)   (237)   (609)   (445)
Balance at end of period  $2,806   $2,372   $2,806   $2,372