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REGULATORY CAPITAL (Tables) | 9 Months Ended
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Sep. 30, 2025
Banking and Thrift, Other Disclosure [Abstract] |
Schedule of Regulatory Capital Requirements Applicable to Busey and Busey Bank | The following tables summarize regulatory capital requirements applicable to First Busey and its subsidiary bank:
|  | As of September 30, 2025
|  | Actual |  | Minimum Capital Requirement |  | Minimum To Be Well Capitalized
(dollars in thousands) |  | Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio
Common equity Tier 1 capital to risk weighted assets |  |  |  |  |  |  |  |  |  |  |  |
First Busey |  | $ | 1,907,982 |  |  | 12.33 | % |  | $ | 696,419 |  |  | 4.50 | % |  | $ | 1,005,938 |  |  | 6.50 | %
Busey Bank |  | $ | 2,118,059 |  |  | 13.73 | % |  | $ | 694,126 |  |  | 4.50 | % |  | $ | 1,002,626 |  |  | 6.50 | %
Tier 1 capital to risk weighted assets |  |  |  |  |  |  |  |  |  |  |  |
First Busey |  | $ | 2,130,732 |  |  | 13.77 | % |  | $ | 928,558 |  |  | 6.00 | % |  | $ | 1,238,078 |  |  | 8.00 | %
Busey Bank |  | $ | 2,118,059 |  |  | 13.73 | % |  | $ | 925,501 |  |  | 6.00 | % |  | $ | 1,234,002 |  |  | 8.00 | %
Total capital to risk weighted assets |  |  |  |  |  |  |  |  |  |  |  |
First Busey |  | $ | 2,458,553 |  |  | 15.89 | % |  | $ | 1,238,078 |  |  | 8.00 | % |  | $ | 1,547,597 |  |  | 10.00 | %
Busey Bank |  | $ | 2,262,302 |  |  | 14.67 | % |  | $ | 1,234,002 |  |  | 8.00 | % |  | $ | 1,542,502 |  |  | 10.00 | %
Leverage ratio of Tier 1 capital to average assets |  |  |  |  |  |  |  |  |  |  |  |
First Busey |  | $ | 2,130,732 |  |  | 11.62 | % |  | $ | 733,327 |  |  | 4.00 | % |  | N/A |  | N/A
Busey Bank |  | $ | 2,118,059 |  |  | 11.59 | % |  | $ | 731,219 |  |  | 4.00 | % |  | $ | 914,024 |  |  | 5.00 | %
|  | As of December 31, 2024
|  | Actual |  | Minimum Capital Requirement |  | Minimum To Be Well Capitalized
(dollars in thousands) |  | Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio
Common equity Tier 1 capital to risk weighted assets |  |  |  |  |  |  |  |  |  |  |  |
First Busey |  | $ | 1,237,301 |  |  | 14.10 | % |  | $ | 394,840 |  |  | 4.50 | % |  | $ | 570,325 |  |  | 6.50 | %
Busey Bank |  | $ | 1,438,296 |  |  | 16.46 | % |  | $ | 393,277 |  |  | 4.50 | % |  | $ | 568,067 |  |  | 6.50 | %
Tier 1 capital to risk weighted assets |  |  |  |  |  |  |  |  |  |  |  |
First Busey |  | $ | 1,314,301 |  |  | 14.98 | % |  | $ | 526,453 |  |  | 6.00 | % |  | $ | 701,938 |  |  | 8.00 | %
Busey Bank |  | $ | 1,438,296 |  |  | 16.46 | % |  | $ | 524,369 |  |  | 6.00 | % |  | $ | 699,159 |  |  | 8.00 | %
Total capital to risk weighted assets |  |  |  |  |  |  |  |  |  |  |  |
First Busey |  | $ | 1,625,943 |  |  | 18.53 | % |  | $ | 701,938 |  |  | 8.00 | % |  | $ | 877,422 |  |  | 10.00 | %
Busey Bank |  | $ | 1,520,938 |  |  | 17.40 | % |  | $ | 699,159 |  |  | 8.00 | % |  | $ | 873,949 |  |  | 10.00 | %
Leverage ratio of Tier 1 capital to average assets |  |  |  |  |  |  |  |  |  |  |  |
First Busey |  | $ | 1,314,301 |  |  | 11.06 | % |  | $ | 475,348 |  |  | 4.00 | % |  | N/A |  | N/A
Busey Bank |  | $ | 1,438,296 |  |  | 12.14 | % |  | $ | 473,878 |  |  | 4.00 | % |  | $ | 592,347 |  |  | 5.00 | %

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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1B + Details
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