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Loan Servicing
12 Months Ended
Dec. 31, 2019
Receivables [Abstract]  
Loan Servicing Loan Servicing
Mortgage loans sold to and serviced for others are not included in the accompanying statements of financial condition. 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  

The Company records servicing assets related to mortgage loans sold and serviced at fair value and will amortize these servicing assets over the period of estimated net servicing income associated with each loan. Management assesses servicing assets for potential impairment annually. Changes in the carrying value of servicing assets are recorded in service fees and charges on the Consolidated Statements of Income. 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  

Custodial and escrow account balances maintained in connection with the foregoing loan servicing arrangements were $2,201,000 and $2,366,000 as of December 31, 2019 and 2018, respectively.