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Other Intangibles
 9 Months Ended
Sep. 30, 2021
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. ACQUISITION 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.

September 30, 2021December 31, 2020
Gross carrying amount$102,396 $102,396 
Other intangibles acquired2,247 — 
Accumulated amortization(77,705)(73,421)
Total core deposit and other intangibles$26,938 $28,975 


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 ten years. Intangible asset amortization expense for the three and nine months ended September 30, 2021 was $1.5 million and $4.3 million, respectively, compared to $1.5 million and $4.5 million for the three and nine months ended September 30, 2020, respectively. Estimated future amortization expense is summarized as follows:
Amortization Expense
2021$1,463 
20225,402 
20235,145 
20244,510 
20253,754 
After 20256,664 
$26,938