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Goodwill and Other Intangible Assets | 12 Months Ended
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Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Other Intangible Assets | Goodwill and Other Intangible Assets The following is a summary of the gross carrying amount and accumulated amortization of amortizable intangible assets as of December 31, 2022 and December 31, 2021 and the carrying amount of unamortizable intangible assets as of those same dates.
|  | December 31, 2022 |  | December 31, 2021
($ in thousands) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization
Amortizable intangible assets: |  |  |  |  |  |  |  |
Customer lists |  | $ | 2,700 |  |  | 1,847 |  |  | 2,700 |  |  | 1,386 |
Core deposit intangibles |  | 29,050 |  |  | 21,274 |  |  | 29,050 |  |  | 18,076 |
SBA servicing asset |  | 13,264 |  |  | 9,260 |  |  | 11,932 |  |  | 6,460 |
Other |  | 100 |  |  | 58 |  |  | 100 |  |  | 33 |
Total |  | $ | 45,114 |  |  | 32,439 |  |  | 43,782 |  |  | 25,955 |
Unamortizable intangible assets: |  |  |  |  |  |  |  |
Goodwill |  | $ | 364,263 |  |  |  |  | 364,263 |  |  |
Customer lists are generally amortized over five years and core deposit intangibles are generally amortized over 10 years, both at an accelerated rate. Amortization expense of all other intangible assets, excluding the SBA servicing asset, totaled $3.7 million, $3.5 million, and $4.0 million for the years ended December 31, 2022, 2021 and 2020, respectively. SBA guarantee servicing fees and SBA servicing asset amortization expense are both recorded within noninterest income within the line item "Other service charges, commissions, and fees." The following table presents the changes in the SBA servicing assets for each period indicated. Impairment charges included with amortization expense in the table below were immaterial for each period presented.
($ in thousands) | December 31, 2022 |  | December 31, 2021
Beginning balance, net | $ | 5,472 |  |  | 5,788 |
New servicing assets | 1,332 |  |  | 1,956 |
Amortization expense and impairment charges | (2,800) |  |  | (2,272) |
Ending balance, net | $ | 4,004 |  |  | 5,472 |
During 2022, 2021, and 2020, the Company recorded $3.4 million, $3.9 million, and $3.3 million, respectively, in SBA guarantee servicing fee income. At December 31, 2022 and 2021, the Company serviced SBA for others totaling $392.4 million and $414.2 million, respectively. There were no other loans serviced for others in any year presented. Goodwill is evaluated for impairment on at least an annual basis, with the annual evaluation occurring as of October 31st of each year. Goodwill is also evaluated for impairment any time there is a triggering event indicating that impairment may have occurred. No triggering events were identified during 2022 or 2021, and therefore, the Company did not perform interim impairment evaluations in either of those years. Each of the Company's goodwill impairment evaluations for the periods presented, including the most recent October 2022 evaluation, indicated that there was no goodwill impairment. The following table presents the changes in carrying amounts of goodwill:
($ in thousands) |  | Total Goodwill
Balance at December 31, 2020 |  | $ | 239,272 |
Additions from acquisition of Select |  | 132,356 |
Reduction from disposal of First Bank Insurance |  | (7,365) |
Balance at December 31, 2021 |  | 364,263 |
Net activity during 2022 |  | — |
Balance at December 31, 2022 |  | $ | 364,263 |
In addition to the changes in goodwill presented above, activity for other intangibles related to transactions since January 1, 2021 are presented as follows. Refer to Note 2 for additional discussion of the transactions. •In connection with the Select acquisition on October 15, 2021, the Company recorded $9.2 million in core deposit intangibles. •Related to the sale of First Bank Insurance, customer lists with a carrying value of $2.8 million were derecognized. The following table presents the estimated amortization expense schedule related to acquisition-related amortizable intangible assets for each of the five calendar years ending December 31, 2027 and the estimated amount amortizable thereafter. These amounts will be recorded as "Intangibles amortization expense" within the noninterest expense section of the consolidated statements of income. These estimates are subject to change in future periods to the extent management determines it is necessary to make adjustments to the carrying value or estimated useful lives of amortizable intangible assets.
($ in thousands) |  | Estimated Amortization Expense
2023 |  | $ | 2,545 |
2024 |  | 1,718 |
2025 |  | 1,358 |
2026 |  | 962 |
2027 |  | 781 |
Thereafter |  | 1,307 |
Total |  | $ | 8,671 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI https://asc.fasb.org/topic&trid=2144416 + Details
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