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Mortgage Servicing Rights (Tables)
12 Months Ended
Dec. 31, 2019
Mortgage Servicing Right [Abstract]  
Fair Value of Mortgage Servicing Rights
The following tables summarize the activity in, and the main assumptions used to determine the fair value of mortgage servicing rights for the periods indicated (dollars in thousands):
Year ended December 31,
201920182017
Balance at beginning of period$7,098  $6,687  $6,595  
Additions913  557  810  
Change in fair value(1,811) (146) (718) 
Balance at end of period$6,200  $7,098  $6,687  
Contractually specified servicing fees, late fees and ancillary fees earned$1,917  $2,038  $2,076  
Balance of loans serviced at:
Beginning of period$785,138  $811,065  $816,623  
End of period$767,662  $785,138  $811,065  
Period end:
Weighted-average prepayment speed (CPR)6.2 %7.6 %8.9 %
Weighted-average discount rate12.0 %12.0 %13.0 %