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Loan Servicing | 12 Months Ended
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Dec. 31, 2017
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Loan Servicing | Note 10 – Loan Servicing Loans serviced for others are not included in the accompanying consolidated balance sheets. The unpaid principal balances of loans serviced for others totaled approximately $1.310 billion and $1.301 billion at December 31, 2017 and 2016. The aggregate fair value of capitalized mortgage servicing rights was approximately $12.8 million, $12.1 million, and $10.8 million at December 31, 2017, 2016 and 2015, compared to the carrying values of $11.6 million, $11.1 million and $8.9 million, respectively. The fair value of capitalized mortgage servicing rights was approximately $7.6 million on January 1, 2015. Comparable market values and a valuation model that calculates the present value of future cash flows were used to estimate fair value. For purposes of measuring impairment, risk characteristics including product type, investor type and interest rates, were used to stratify the originated mortgage servicing rights.
|  | December 31 |  |  | December 31 |  |  | December 31 |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Mortgage servicing rights |  |  |  |  |  |  |  |  |  |  |  |
Balances, January 1 |  | $ | 11,681 |  |  | $ | 9,271 |  |  | $ | 7,980 |
Servicing rights capitalized |  |  | 2,109 |  |  |  | 3,426 |  |  |  | 2,974 |
Amortization of servicing rights |  |  | (1,601 | ) |  |  | (1,016 | ) |  |  | (1,683 | )
Balances, December 31 |  |  | 12,189 |  |  |  | 11,681 |  |  |  | 9,271 |
Impairment allowance |  |  |  |  |  |  |  |  |  |  |  |
Balances, January 1 |  |  | (507 | ) |  |  | (397 | ) |  |  | (338 | )
Additions |  |  | (85 | ) |  |  | (236 | ) |  |  | (130 | )
Reductions |  |  | 5 |  |  |  | 126 |  |  |  | 71 |
Balances, December 31 |  |  | (587 | ) |  |  | (507 | ) |  |  | (397 | )
Mortgage servicing rights, net |  | $ | 11,602 |  |  | $ | 11,174 |  |  | $ | 8,874 |
During 2017, 2016 and 2015, the Bank recorded additional impairment of approximately $80,000, $110,000 and $59,000, respectively.

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