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Loan Servicing (Tables)
 12 Months Ended
Dec. 31, 2019
Receivables [Abstract]  
Unpaid Principal Balance of Serviced Mortgage Loans for Others The unpaid principal balances of these loans as of December 31 of the years indicated are summarized as follows:
(dollars in thousands)
20192018
Mortgage loans sold to Federal Home Loan Mortgage Corporation without recourse
$3,723  $4,438  
Mortgage loans sold to Federal National Mortgage Association without recourse
114,895  134,550  
Mortgage loans sold to Federal Home Loan Bank without recourse
200  315  
Total, end of period$118,818  $139,303  
Activity Related to Servicing Assets Activity related to servicing assets for the years ended December 31, 2019, 2018 and 2017 is summarized as follows.
(dollars in thousands)
201920182017
Balance, beginning of period$272  $422  $622  
Amortization
(111) (150) (200) 
Balance, end of period
161  272  422  
Fair value, end of period
$530  $789  $1,141