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SERVICING ASSETS | 12 Months Ended
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Dec. 31, 2022
Transfers and Servicing [Abstract] |
SERVICING ASSETS | SERVICING ASSETS At December 31, 2022, the fair value of mortgage servicing rights was $50.9 million ($49.0 million — December 31, 2021). The following table presents the changes in servicing rights measured using the fair value method for 2022, 2021 and 2020:
|  |  | Year Ended December 31,
|  |  |  |  | 2022 |  | 2021 |  | 2020
|  |  |  |  | (In thousands)
Fair value at beginning of year |  |  |  |  | $ | 48,973 |  |  | $ | 47,295 |  |  | $ | 50,779 |
Servicing from mortgage securitization or asset transfers |  |  |  |  | 3,998 |  |  | 6,089 |  |  | 2,394 |
Changes due to payments on loans |  |  |  |  | (5,312) |  |  | (6,738) |  |  | (4,067) |
Changes in fair value due to changes in valuation model inputs or assumptions |  |  |  |  | 3,262 |  |  | 2,327 |  |  | (1,811) |
Fair value at end of year |  |  |  |  | $ | 50,921 |  |  | $ | 48,973 |  |  | $ | 47,295 |
The following table presents key economic assumption ranges used in measuring the mortgage-related servicing asset fair value as of December 31, 2022, 2021 and 2020:
| Year Ended December 31,
| 2022 |  | 2021 |  | 2020
Constant prepayment rate | 3.43% - 21.20% |  | 3.90% - 24.48% |  | 5.02% - 35.22%
Discount rate | 10.00% - 15.50% |  | 10.00% - 15.50% |  | 10.00% - 15.50%
The sensitivity of the current fair value of servicing assets to immediate 10 percent and 20 percent adverse changes in the above key assumptions were as follows:
| December 31,
| 2022 |  | 2021
| (In thousands)
Mortgage-related servicing asset |  |  |
Carrying value of mortgage servicing asset | $ | 50,921 |  |  | $ | 48,973 |
Weighted average life (in years) | 7.8 |  | 7.8
Constant prepayment rate |  |  |
Decrease in fair value due to 10% adverse change | $ | (956) |  |  | $ | (1,020) |
Decrease in fair value due to 20% adverse change | $ | (1,880) |  |  | $ | (2,004) |
Discount rate |  |  |
Decrease in fair value due to 10% adverse change | $ | (2,265) |  |  | $ | (2,175) |
Decrease in fair value due to 20% adverse change | $ | (4,356) |  |  | $ | (4,183) |
These sensitivities are hypothetical and should be used with caution. As the figures indicate, changes in fair value based on a 10% variation in assumptions generally cannot be extrapolated because the relationship of the change in assumption to the change in fair value may not be linear. Also, in this table, the effect of a variation in a particular assumption on the fair value of the retained interest is calculated without changing any other assumption. Changes in one factor may result in changes in another (for example, increases in market interest rates may result in lower prepayments), which may magnify or offset the sensitivities. Mortgage banking activities, a component of total banking and financial service revenue in the consolidated statements of operations, include the changes from period to period in the fair value of the mortgage loan servicing rights, which may result from changes in the valuation model inputs or assumptions (principally reflecting changes in discount rates and prepayment speed assumptions) and other changes, including changes due to collection/realization of expected cash flows. Servicing fee income is based on a contractual percentage of the outstanding principal balance and is recorded as income when earned. Servicing fees on mortgage loans for 2022, 2021 and 2020 totaled $20.3 million, $21.4 million and $17.2 million, respectively.

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI 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