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Servicing Rights | 12 Months Ended
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Dec. 31, 2018
Transfers and Servicing [Abstract] |
Servicing Rights | Servicing Rights Mortgage servicing rights The following table details the activity in the Company's mortgage servicing rights ("MSR") for the year indicated:
(In Thousands) | 2018 | 2017 | 2016
Balance, beginning of period |  | $7,305 |  |  | $4,157 |  |  | $1,654 |
Additions for new MSR capitalized | 3,641 |  | 3,146 |  | 3,029 |
Changes in fair value: |  |  |
Due to changes in model inputs of assumptions (1) | 591 |  | 551 |  | (214 | )
Other (2) | (716 | ) | (549 | ) | (312 | )
Carrying value, December 31 |  | $10,821 |  |  | $7,305 |  |  | $4,157 |
(1) Principally reflects changes in discount rates and prepayment speed assumptions, which are primarily affected by changes in interest rates. (2) Represents changes due to collection/realization of expected cash flows over time. The following table details information related to our serviced mortgage loan portfolio as of December 31, 2018 and 2017:
(In Thousands) | December 31, 2018 | December 31, 2017
Balance of mortgage loans serviced for others |  | $557,583 |  |  | $406,291 |
MSR as a percentage of serviced loans | 1.94 | % | 1.80 | %
The Company recognized servicing fees of $1.9 million, $1.3 million, and $675,000 during 2018, 2017, and 2016, respectively, which includes revenues recognized at capitalization of new mortgage servicing rights, late fees, and ancillary fees as a component of other noninterest income in the Company's Consolidated Statements of Income. The following table outlines the key assumptions used in measuring the fair value of mortgage servicing rights as of December 31, 2018 and 2017:
| 2018 |  | 2017 |
Average constant prepayment rate | 7.70 | % | 9.00 | %
Average discount rate | 9.94 | % | 9.45 | %
Key economic assumptions and the sensitivity of the current fair value for MSR to immediate adverse changes in those assumptions at December 31, 2018 and 2017 were as follows:
(In Thousands) |  | December 31, 2018 | December 31, 2017
Aggregate portfolio principal balance |  |  | $557,583 |  |  | $406,291 |
Weighted average rate of note |  | 3.91 | % | 3.77 | %
December 31, 2018 | Base | 1.0% Adverse Rate Change | 2.0% Adverse Rate Change
Conditional prepayment rate | 7.70 | % | 19.35 | % | 20.95 | %
Discount rate | 9.94 | % | 8.94 | % | 7.94 | %
Fair value MSR |  | $10,821 |  |  | $7,115 |  |  | $6,829 |
Percentage of MSR | 1.94 | % | 1.28 | % | 1.22 | %
December 31, 2017 |  |  |
Conditional prepayment rate | 9.00 | % | 23.33 | % | 25.25 | %
Discount rate | 9.45 | % | 8.45 | % | 7.45 | %
Fair value MSR |  | $7,305 |  |  | $4,343 |  |  | $4,109 |
Percentage of MSR | 1.80 | % | 1.07 | % | 1.01 | %
The above tables show the sensitivity to market rate changes for the par rate coupon for a conventional one-to-four family Alaska Housing Finance Corporation/FNMA/FHLMC serviced home loan. The above tables reference a 100 basis point and 200 basis point decrease in note rates. These sensitivities are hypothetical and should be used with caution as the tables above demonstrate the Company’s methodology for estimating the fair value of MSR is highly sensitive to changes in key assumptions. For example, actual prepayment experience may differ and any difference may have a material effect on MSR fair value. Changes in fair value resulting from changes in assumptions generally cannot be extrapolated because the relationship of the change in the assumption to the change in fair value may not be linear. Also, in these tables, the effects of a variation in a particular assumption on the fair value of the MSR is calculated without changing any other assumption; in reality, changes in one factor may be associated with changes in another (for example, decreases in market interest rates may provide an incentive to refinance; however, this may also indicate a slowing economy and an increase in the unemployment rate, which reduces the number of borrowers who qualify for refinancing), which may magnify or counteract the sensitivities. Thus, any measurement of MSR fair value is limited by the conditions existing and assumptions made at a particular point in time. Those assumptions may not be appropriate if they are applied to a different point in time. Commercial servicing rights The Company recorded a commercial servicing right asset ("CSR") for the first time in 2018. Refer to the "Error Corrections" section in footnote 1 of the Notes to the Consolidated Financial Statements for additional information regarding this adjustment. The CSR has a carrying value of $1.0 million at December 31, 2018, and total commercial loans serviced for others were $239.5 million at December 31, 2018. Key assumptions used in measuring the fair value of CSRs as of December 31, 2018 include a conditional prepayment rate of 12.72% and a discount rate of 11.49%.

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- Definition The entire disclosure for a transferor's continuing involvement in financial assets that it has transferred in a securitization or asset-backed financing arrangement, the nature of any restrictions on assets reported by an entity in its statement of financial position that relate to a transferred financial asset (including the carrying amounts of such assets), how servicing assets and servicing liabilities are reported, and (for securitization or asset-backed financing arrangements accounted for as sales) when a transferor has continuing involvement with the transferred financial assets and transfers of financial assets accounted for as secured borrowings, how the transfer of financial assets affects an entity's financial position, financial performance, and cash flows. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -URI http://asc.fasb.org/topic&trid=2197590 + Details
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