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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)
 12 Months Ended
Dec. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Carrying Amount of Goodwill by Operating Segment
The carrying amount of goodwill by operating segment is presented in the table below:
As of December 31,
(dollars in thousands)20252024
Goodwill
Banking$360,180 $310,595 
Wealth Management14,108 14,108 
FirsTech8,992 8,992 
Total goodwill$383,280 $333,695 
Schedule of Other Intangible Asset Disclosures The following table present Busey’s intangible asset balances and the related amounts of accumulated amortization:
As of December 31, 2025
(dollars in thousands)Core deposit
intangible		Customer
relationship
intangible		Total
Intangible Assets
Intangible assets, gross$187,194 $33,138 $220,332 
Accumulated amortization93,558 29,325 122,883 
Intangible assets, net$93,636 $3,813 $97,449 
As of December 31, 2024
(dollars in thousands)Core deposit
intangible		Customer
relationship
intangible		Total
Intangible Assets
Intangible assets, gross$105,411 $33,138 $138,549 
Accumulated amortization78,831 27,438 106,269 
Intangible assets, net$26,580 $5,700 $32,280 
Schedule of Amortization Expense Relating to Intangible Assets
Amortization expense related to intangible assets, as reflected on Busey's Consolidated Statements of Income, is presented in the table below:
Years Ended December 31,
(dollars in thousands)202520242023
Amortization Expense
Core deposit intangible$14,727 $7,739 $7,616 
Customer relationship intangible1,887 2,318 2,816 
Amortization of intangible assets$16,614 $10,057 $10,432 
Schedule of Carrying Amount of Amortized Intangible Assets
Future expense for the amortization of intangible assets, as estimated, is summarized in the table below:
As of December 31, 2025
(dollars in thousands)Core deposit
intangible		Customer
relationship
intangible		Total
Estimated amortization expense
2026$15,277 $1,479 $16,756 
202714,251 1,091 15,342 
202813,184 703 13,887 
202910,266 360 10,626 
20309,160 162 9,322 
Thereafter31,498 18 31,516 
Total estimated amortization expense$93,636 $3,813 $97,449