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Loan Servicing, Mortgage Origination, and Loans Held for Sale | 12 Months Ended
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Dec. 31, 2020
Loan Servicing, Mortgage Origination, and Loans Held for Sale |
Loan Servicing, Mortgage Origination, and Loans Held for Sale | Note 30—Loan Servicing, Mortgage Origination, and Loans Held for Sale The portfolio of residential mortgages serviced for others, which are not included in the accompanying balance sheets, was $5.1 billion and $3.3 billion at December 31, 2020 and 2019, respectively. Servicing loans for others generally consists of collecting mortgage payments, maintaining escrow accounts and disbursing payments to investors. The amounts of contractually specified servicing fees earned by the Company during the years ended December 31, 2020 and 2019 were $9.8 million and $7.8 million, respectively. Servicing fees are recorded in mortgage banking income in the Company’s consolidated statements of income. At December 31, 2020 and 2019, MSRs were $43.8 million and $30.5 million, respectively, on the Company’s consolidated balance sheet. MSRs are recorded at fair value with changes in fair value recorded as a component of mortgage banking income in the Consolidated Statements of Income. The market value adjustments related to MSRs recorded in mortgage banking income for the years ended December 31, 2020 and 2019 were a loss of $7.4 million and a loss of $7.0 million, respectively. The Company has used various free standing derivative instruments to mitigate the income statement effect of changes in fair value due to changes in market value adjustments and to changes in valuation inputs and assumptions related to MSRs. The following table presents the changes in the fair value of MSRs and its offsetting hedge. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ |  | Year Ended December 31, |
(Dollars in thousands) |  | ​ | 2020 | ​ | 2019 | ​ | 2018 |
Increase (decrease) in fair value of MSRs | ​ | ​ | $ | (7,421) | ​ | $ | (6,976) | ​ | $ | 1,861 | ​
Decay of MSRs | ​ | ​ |  | (8,793) | ​ |  | (4,589) | ​ |  | (4,215) | ​
Gain related to derivatives | ​ | ​ |  | 10,177 | ​ |  | 3,967 | ​ |  | (953) | ​
Net effect on statements of income | ​ | ​ | $ | (6,037) | ​ | $ | (7,598) | ​ | $ | (3,307) | ​
​ The fair value of MSRs is highly sensitive to changes in assumptions and fair value is determined by estimating the present value of the asset’s future cash flows utilizing market-based prepayment rates, discount rates and other assumptions validated through comparison to trade information, industry surveys and with the use of independent third party appraisals. Changes in prepayment speed assumptions have the most significant impact on the fair value of MSRs. Generally, as interest rates decline, mortgage loan prepayments accelerate due to increased refinance activity, which results in a decrease in the fair value of the MSR. Measurement of fair value is limited to the conditions existing and the assumptions utilized as of a particular point in time, and those assumptions may not be appropriate if they are applied at a different time. See Note 26—Fair Value for additional information regarding fair value. The characteristics and sensitivity analysis of the MSRs are included in the following table. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​
(Dollars in thousands) |  | 2020 |  | 2019 |
Composition of residential loans serviced for others | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fixed-rate mortgage loans | ​ | ​ | 99.9 | % | ​ | 99.8 | %
Adjustable-rate mortgage loans | ​ | ​ | 0.1 | % | ​ | 0.2 | %
Total | ​ | ​ | 100.0 | % | ​ | 100.0 | %
Weighted average life | ​ | ​ | 6.10 | years | ​ | 6.55 | years
Constant Prepayment rate (CPR) | ​ | ​ | 12.3 | % | ​ | 10.3 | %
Weighted average discount rate | ​ | ​ | 9.0 | % | ​ | 9.4 | %
Effect on fair value due to change in interest rates | ​ | ​ | ​ | ​ | ​ | ​ | ​
25 basis point increase | ​ | $ | 2,744 | ​ | $ | 2,477 | ​
50 basis point increase | ​ | ​ | 5,520 | ​ |  | 4,452 | ​
25 basis point decrease | ​ | ​ | (2,497) | ​ |  | (2,938) | ​
50 basis point decrease | ​ | ​ | (4,114) | ​ |  | (6,228) | ​
​ The sensitivity calculations above are hypothetical and should not be considered to be predictive of future performance. Changes in fair value based on adverse changes in assumptions generally cannot be extrapolated because the relationship of the changes in assumptions to fair value may not be linear. Also, in this table, the effects of an adverse variation in a particular assumption on the fair value of the MSRs is calculated without changing any other assumptions, while in reality, changes in one factor may result in changing another, which may magnify or contract the effect of the change. Custodial escrow balances maintained in connection with the loan servicing were $26.6 million and $16.5 million at December 31, 2020 and 2019. Whole loan sales were $3.2 billion and $812.3 million for the years ended December 31, 2020 and 2019, of which $2.7 billion and $660.6 million or 85.1% and 81.3% were sold with the servicing rights retained by the Company. Loans held for sale have historically been comprised of residential mortgage loans awaiting sale in the secondary market, which generally settle in 15 to 45 days. At December 31, 2020, loans held for sale were $290.5 million, compared with $59.4 million at December 31, 2019.

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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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