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21) Mortgage Servicing Rights | 12 Months Ended
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Dec. 31, 2017
Notes |
21) Mortgage Servicing Rights | 21) Mortgage Servicing Rights The Company reports MSRs pursuant to the accounting policy discussed in Note 1 of the Notes to Consolidated Financial Statements. The following table presents the MSR activity for the periods presented.
| December 31
| 2017 | 2016
Amortized cost: |  |
Balance before valuation allowance at beginning of year | $ 18,872,362 | $ 12,679,755
MSR additions resulting from loan sales | 6,085,352 | 8,603,154
Amortization (1) | (3,580,777) | (2,410,547)
Application of valuation allowance to write down MSRs with other than temporary impairment | - | -
Balance before valuation allowance at year end | $ 21,376,937 | $ 18,872,362
Valuation allowance for impairment of MSRs: |  |
Balance at beginning of year | $ - | $ -
Additions | - | -
Application of valuation allowance to write down MSRs with other than temporary impairment | - | -
Balance at year end | $ - | $ -
Mortgage servicing rights, net | $ 21,376,937 | $ 18,872,362
Estimated fair value of MSRs at year end | $ 27,427,174 | $ 25,496,832
(1) Included in other expenses on the consolidated statements of earnings
The following table summarizes the Company’s estimate of future amortization of its existing MSRs carried at amortized cost. This projection was developed using the assumptions made by management in its December 31, 2017 valuation of MSRs. The assumptions underlying the following estimate will change as market conditions and portfolio composition and behavior change, causing both actual and projected amortization levels to change over time. Therefore, the following estimates will change in a manner and amount not presently determinable by management.
|  | Estimated MSR Amortization
2018 |  | $ 4,057,830
2019 |  | 4,057,830
2020 |  | 4,057,830
2021 |  | 4,057,684
2022 |  | 3,242,163
Thereafter |  | 1,903,600
Total |  | $ 21,376,937
During the years ended December 31, 2017 and 2016, the Company collected the following contractual servicing fee income and late fee income as reported in other revenues on the consolidated statements of earnings:
| 2017 |  | 2016
Contractual servicing fees | $ 7,199,649 |  | $ 5,661,699
Late fees | 284,550 |  | 203,509
Total | $ 7,484,199 |  | $ 5,865,207
The following is a summary of the unpaid principal balances (“UPB”) of the servicing portfolio for the periods presented:
| Years Ended December 31
| 2017 |  | 2016 |
Servicing UPB | 2,924,868,843 |  | 2,720,441,340 |
The following key assumptions were used in determining MSR value:
| Prepayment Speeds | Average Life(Years) | Discount Rate
December 31, 2017 | 3.67% | 6.34 | 10.01
December 31, 2016 | 3.77% | 6.52 | 10.01

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