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.