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Other Intangibles
 12 Months Ended
Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Other Intangibles
OTHER INTANGIBLES

Core deposit intangibles and other intangibles are recorded on the acquisition date of an entity. The Corporation has one year after the acquisition date, the measurement period, to record subsequent adjustments to these intangibles for provisional amounts recorded at the acquisition date. The Level One acquisition on April 1, 2022 resulted in a core deposit intangible of $17.2 million and other intangibles, consisting of non-compete intangibles, of $1.4 million. In addition, the Hoosier acquisition on April 1, 2021 resulted in a customer relationship intangible of $2.2 million. Details regarding the Level One and Hoosier acquisitions are discussed in NOTE 2. ACQUISITIONS of these Notes to Consolidated Financial Statements.

The carrying basis and accumulated amortization of recognized core deposit and other intangibles are noted below.
 20222021
Gross carrying amount$104,643 $102,396 
Other intangibles acquired18,642 2,247 
Accumulated amortization(87,443)(79,168)
Total core deposit and other intangibles$35,842 $25,475 
 

The core deposit intangibles and other intangibles are being amortized primarily on an accelerated basis over their estimated useful lives, generally over a period of two to ten years. Amortization expense for the years ended December 31, 2022, 2021 and 2020, was $8.3 million, $5.7 million and $6.0 million, respectively.

Estimated future amortization expense is summarized as follows:
Amortization Expense
2023$8,742 
20247,271 
20256,028 
20264,910 
20273,603 
After 20275,288 
 $35,842