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Mortgage Banking and Servicing Rights | 12 Months Ended
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Dec. 31, 2018
Mortgage Banking and Servicing Rights [Abstract] |
Mortgage Banking and Servicing Rights | 5. Mortgage Banking and Servicing Rights Mortgage banking activities primarily include residential mortgage originations and servicing. As discussed in note 1 above, mortgage servicing rights (“MSRs”) are carried at fair market value. The fair value is determined quarterly based on an independent third-party valuation using a discounted cash flow analysis and calculated using a computer pricing model. The system used in this evaluation, Compass Point, attempts to quantify loan level idiosyncratic risk by calculating a risk derived value. As a result, each loan’s unique characteristics determine the valuation assumptions ascribed to that loan. Additionally, the computer valuation is based on key economic assumptions including the prepayment speeds of the underlying loans generated using the Andrew Davidson Prepayment Model, FHLMC/FNMA guidelines, the weighted average life of the loan, the discount rate, the weighted average coupon, and the weighted-average default rate, as applicable. Along with the gains received from the sale of loans, fees are received for servicing loans. These fees include late fees, which are recorded in interest income, and ancillary fees and monthly servicing fees, which are recorded in noninterest income. Costs of servicing loans are charged to expense as incurred. Changes in fair market value of the MSRs are reported as an increase or decrease to mortgage banking income. The following table presents the components of mortgage banking income:
(in thousands) Year Ended December 31 |  | 2018 |  |  | 2017 |  |  | 2016 |
Net gain on sale of mortgage loans held for sale |  | $ | 1,288 |  |  | $ | 1,232 |  |  | $ | 1,831 |
Net loan servicing income (expense) |  |  |  |  |  |  |  |  |  |  |  |
Servicing fees |  |  | 1,275 |  |  |  | 1,255 |  |  |  | 1,239 |
Late fees |  |  | 73 |  |  |  | 84 |  |  |  | 78 |
Ancillary fees |  |  | 282 |  |  |  | 239 |  |  |  | 322 |
Fair value adjustments |  |  | (343 | ) |  |  | (361 | ) |  |  | (324 | )
Net loan servicing income |  |  | 1,287 |  |  |  | 1,217 |  |  |  | 1,315 |
Mortgage banking income |  | $ | 2,575 |  |  | $ | 2,449 |  |  | $ | 3,146 |
Mortgage loans serviced for others are not included in the accompanying balance sheets. Loans serviced for the benefit of others (primarily FHLMC) totaled $462 million, $462 million, and $466 million at December 31, 2018, 2017, and 2016, respectively. Servicing loans for others generally consists of collecting mortgage payments, maintaining escrow accounts, disbursing payments to investors, and processing foreclosures. Custodial escrow balances maintained in connection with the foregoing loan servicing, and included in demand deposits, were approximately $1.0 million at December 31, 2018, 2017, and 2016, respectively. Activity for capitalized mortgage servicing rights using the fair value method is as follows:
(in thousands) |  | 2018 |  |  | 2017 |  |  | 2016 |
Fair value of MSRs, beginning of period |  | $ | 3,484 |  |  | $ | 3,433 |  |  | $ | 3,236 |
New servicing assets created |  |  | 466 |  |  |  | 412 |  |  |  | 521 |
Change in fair value during the period due to: |  |  |  |  |  |  |  |  |  |  |  |
Time decay (1) |  |  | (189 | ) |  |  | (184 | ) |  |  | (175 | )
Payoffs (2) |  |  | (227 | ) |  |  | (268 | ) |  |  | (313 | )
Changes in valuation inputs or assumptions (3) |  |  | 73 |  |  |  | 91 |  |  |  | 164 |
Fair value of MSRs, end of period |  | $ | 3,607 |  |  | $ | 3,484 |  |  | $ | 3,433 |
(1) | Represents decrease in value due to regularly scheduled loan principal payments and partial loan paydowns.
(2) | Represents decrease in value due to loans that paid off during the period.
(3) | Represents change in value resulting from market-driven changes in interest rates.
The fair values of capitalized mortgage servicing rights were $3.6 million, $3.5 million, and $3.4 million at December 31, 2018, 2017, and 2016, respectively. Fair values for the years ended December 31, 2018, 2017, and 2016 were determined by third-party valuations with a resulting 10.1% average discount rate over the last three years, respectively, and weighted average default rates of 2.57%, 3.03%, and 3.02%, respectively. Prepayment speeds generated using the Andrew Davidson Prepayment Model averaged 9.5%, 10.0%, and 9.5% at December 31, 2018, 2017, and 2016, respectively. MSR values are very sensitive to movement in interest rates as expected future net servicing income depends on the projected balance of the underlying loans, which can be greatly impacted by the level of prepayments. CTBI does not currently hedge against changes in the fair value of its MSR portfolio.

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- Definition The entire disclosure for financial services specifically banking and thrift entities at the end of the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -URI http://asc.fasb.org/topic&trid=2209208 + Details
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