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Secondary Market Mortgage Activities
 12 Months Ended
Dec. 31, 2020
Mortgage Banking [Abstract]  
Secondary Market Mortgage Activities Secondary Market Mortgage ActivitiesTotal loans serviced for others were $224,296 and $188,648 December 31, 2020 and December 31, 2019, respectively.
The following summarizes secondary market mortgage activities for the years ended December 31, 2020, December 31, 2019, and December 31, 2018: 
December 31, 2020December 31, 2019December 31, 2018
Loans originated for resale$87,528 $43,458 $22,990 
Proceeds from sales of loans held for sale82,619 43,198 23,311 
Net gains on sales of loans held for sale2,961 990 624 
Loan servicing fees726 634 600 

The following summarizes activity for capitalized mortgage servicing rights for the years ended December 31, 2020, December 31, 2019, and December 31, 2018: 
December 31, 2020December 31, 2019December 31, 2018
Balance, beginning of year$1,573 $1,495 $1,387 
Additions540 292 315 
Servicing rights acquired0 0 0 
Amortization(586)(214)(207)
Balance, end of year$1,527 $1,573 $1,495 

The fair value of mortgage servicing rights is based on market prices for comparable mortgage servicing contracts, when available, or alternatively based on a valuation model that calculates the present value of estimated future net servicing income. The fair value of mortgage servicing rights was not materially different than amortized cost at December 31, 2020 and December 31, 2019, respectively. No valuation allowance was deemed necessary at December 31, 2020, December 31, 2019, and December 31, 2018. The fair value of interest rate lock commitments and forward commitments to sell loans was not material at December 31, 2020 or December 31, 2019.