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Goodwill And Other Intangible Assets
 12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill And Other Intangible Assets Goodwill and Other Intangible Assets
The following table presents information about the Company's intangible assets which have estimable useful lives.
December 31, 2020December 31, 2019
(In thousands)
Gross Carrying Amount
Accumulated Amortization
Valuation Allowance
 Net Amount
Gross Carrying Amount
 Accumulated Amortization
Valuation Allowance
Net Amount
Amortizable intangible assets:
Core deposit premium
$31,270 $(29,912)$— $1,358 $31,270 $(29,485)$— $1,785 
Mortgage servicing rights
15,238 (6,886)(2,103)6,249 12,942 (4,866)(327)7,749 
Total
$46,508 $(36,798)$(2,103)$7,607 $44,212 $(34,351)$(327)$9,534 

The carrying amount of goodwill and its allocation among segments at December 31, 2020 and 2019 is shown in the table below. As a result of ongoing assessments, no impairment of goodwill was recorded in 2020, 2019 or 2018. Further, the annual assessment of qualitative factors on January 1, 2021 revealed no likelihood of impairment as of that date.
(In thousands)December 31, 2020December 31, 2019
Consumer segment$70,721 $70,721 
Commercial segment67,454 67,454 
Wealth segment746 746 
Total goodwill$138,921 $138,921 
Changes in the net carrying amount of goodwill and other net intangible assets for the years ended December 31, 2020 and 2019 are shown in the following table. During the year ended December 31, 2020, the Company purchased an easement for $3.6 million in connection with the Developer Services Agreement that was signed during the third quarter of 2020 to develop a commercial office complex in Clayton, Missouri. The easement, which grants the Company access to all portions of the parking facility and terrace garden, is perpetual and will be assessed for impairment at least annually, or whenever events or circumstances indicate an impairment may have occurred.

(In thousands)
Goodwill
Easement
Core Deposit Premium
Mortgage Servicing Rights
Balance at December 31, 2018$138,921 $— $2,316 $6,478 
Originations— — — 2,603 
Amortization— — (531)(1,005)
Impairment— — — (327)
Balance at December 31, 2019138,921 — 1,785 7,749 
Originations— 3,600 — 2,296 
Amortization— — (427)(2,020)
Impairment— — — (1,776)
Balance at December 31, 2020$138,921 $3,600 $1,358 $6,249 

Mortgage servicing rights (MSRs) are initially recorded at fair value and subsequently amortized over the period of estimated servicing income. They are periodically reviewed for impairment at a tranche level, and if impairment is indicated, recorded at fair value. Temporary impairment, including impairment recovery, is effected through a change in a valuation allowance. At December 31, 2020, temporary impairment of $2.1 million had been recognized. The fair value of the MSRs is based on the present value of expected future cash flows, as further discussed in Note 17 on Fair Value Measurements.

Aggregate amortization expense on intangible assets for the years ended December 31, 2020, 2019 and 2018 was $2.4 million, $1.5 million and $1.3 million, respectively. The following table shows the estimated future amortization expense based on existing asset balances and the interest rate environment as of December 31, 2020. The Company’s actual amortization expense in any given period may be different from the estimated amounts depending upon the acquisition of intangible assets, changes in mortgage interest rates, prepayment rates and other market conditions.
(In thousands)
2021$1,445 
20221,145 
2023930 
2024755 
2025613