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Goodwill and Other Intangible Assets
 6 Months Ended
Jun. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets GOODWILL AND OTHER INTANGIBLE ASSETS
The following table presents the changes in the carrying amount of goodwill:
Three Months Ended
June 30,		Six Months Ended
June 30,
(dollars in thousands)2025202420252024
Balance at beginning of period$2,175,251 $1,998,716 $2,175,251 $1,998,716 
Acquisitions and adjustments234,635 171,993 234,635 171,993 
Balance at end of period$2,409,886 $2,170,709 $2,409,886 $2,170,709 
During the three months ended June 30, 2025, Old National recorded $234.6 million of goodwill associated with the acquisition of Bremer. During the three months ended June 30, 2024, Old National recorded $172.0 million of goodwill associated with the acquisition of CapStar. See Note 3 to the consolidated financial statements for additional detail regarding these transactions.
Old National performed the required annual goodwill impairment test as of August 31, 2024 and there was no impairment. No events or circumstances since the August 31, 2024 annual impairment test were noted that would indicate it was more likely than not a goodwill impairment exists.
The gross carrying amounts and accumulated amortization of other intangible assets were as follows: 
(dollars in thousands)Gross
Carrying
Amount		Accumulated
Amortization
and Impairment		Net
Carrying
Amount
June 30, 2025   
Core deposit$586,735 $(119,268)$467,467 
Customer relationship93,892 (26,873)67,019 
Total other intangible assets$680,627 $(146,141)$534,486 
December 31, 2024
Core deposit$189,636 $(95,950)$93,686 
Customer relationship50,892 (23,731)27,161 
Total other intangible assets$240,528 $(119,681)$120,847 
Other intangible assets consist of core deposit intangibles and customer relationship intangibles and are being amortized primarily on an accelerated basis over their estimated useful lives, generally over a period of 5 to 15 years. During the three months ended June 30, 2025, Old National recorded $397.1 million of core deposit intangibles and $43.0 million of customer relationship intangibles associated with the acquisition of Bremer. See Note 3 to the consolidated financial statements for additional detail regarding this transaction.
Old National reviews other intangible assets for possible impairment whenever events or changes in circumstances indicate that carrying amounts may not be recoverable. No impairment charges were recorded during the six months ended June 30, 2025 or 2024. Total amortization expense associated with intangible assets was $19.6 million and $26.5 million for the three and six months ended June 30, 2025, respectively, compared to $7.4 million and $12.9 million for the three and six months ended June 30, 2024, respectively.
Estimated amortization expense for future years is as follows:
(dollars in thousands) 
2025 remaining$52,200 
202696,109 
202784,810 
202873,689 
202962,983 
Thereafter164,695 
Total$534,486