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Other Intangibles
 3 Months Ended
Mar. 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 Hoosier acquisition on April 1, 2021 resulted in a customer relationship intangible of $2,247,000. Details regarding the Hoosier acquisition are discussed in NOTE 2. ACQUISITIONS of these Notes to Consolidated Condensed Financial Statements. The carrying basis and accumulated amortization of recognized core deposit intangibles and other intangibles are noted below.

March 31, 2022December 31, 2021
Gross carrying amount$104,643 $102,396 
Other intangibles acquired— 2,247 
Accumulated amortization(80,534)(79,168)
Total core deposit and other intangibles$24,109 $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 years to ten years. Intangible amortization expense for each of the three months ended March 31, 2022 and March 31, 2021 was $1.4 million. Estimated future amortization expense is summarized as follows:
Amortization Expense
2022$4,036 
20235,145 
20244,510 
20253,754 
20262,948 
After 20263,716 
$24,109