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Secondary Market Mortgage Activities | 12 Months Ended
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Dec. 31, 2017
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Secondary Market Mortgage Activities | 6. Secondary Market Mortgage Activities The following summarizes secondary market mortgage activities for the years ended December 31, 2017, 2016 and 2015:
|  | 2017 |  |  | 2016 |  |  | 2015 |
Loans originated for resale |  | $ | 25,231 |  |  | $ | 31,255 |  |  | $ | 15,171 |
Proceeds from sales of loans held for sale |  |  | 24,285 |  |  |  | 33,045 |  |  |  | 14,927 |
Net gains on sales of loans held for sale |  |  | 545 |  |  |  | 818 |  |  |  | 630 |
Loan servicing fees |  |  | 563 |  |  |  | 421 |  |  |  | 390 |
Total loans serviced for others were $159,208 and $157,073 December 31, 2017 and 2016, respectively. The following summarizes activity for capitalized mortgage servicing rights for the years ended December 31, 2017, 2016, and 2015:
|  | 2017 |  |  | 2016 |  |  | 2015 |
Balance, beginning of year |  | $ | 1,391 |  |  | $ | 962 |  |  | $ | 856 |
Additions |  |  | 198 |  |  |  | 200 |  |  |  | 380 |
Servicing rights acquired |  |  | 0 |  |  |  | 367 |  |  |  | 0 |
Amortization |  |  | (202 | ) |  |  | (138 | ) |  |  | (274 | )
Balance, end of year |  | $ | 1,387 |  |  | $ | 1,391 |  |  | $ | 962 |
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, 2017 and 2016, respectively. No valuation allowance is deemed necessary at December 31, 2017, 2016, or 2015. The fair value of interest rate lock commitments and forward commitments to sell loans was not material at December 31, 2017 or 2016.

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