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REGULATORY CAPITAL - Schedule of Regulatory Capital Requirements Applicable to Busey and Busey Bank (Details) $ in Thousands | Sep. 30, 2025 USD ($) | Dec. 31, 2024 USD ($)
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Common Equity Tier 1 Capital to Risk Weighted Assets, Amount |  |
Actual | $ 1,907,982 | $ 1,237,301
Minimum Capital Requirement | 696,419 | 394,840
Minimum To Be Well Capitalized | $ 1,005,938 | $ 570,325
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio |  |
Actual | 0.1233 | 0.1410
Minimum Capital Requirement | 0.0450 | 0.0450
Minimum To Be Well Capitalized | 0.0650 | 0.0650
Tier 1 Capital to Risk Weighted Assets, Amount |  |
Actual | $ 2,130,732 | $ 1,314,301
Minimum Capital Requirement | 928,558 | 526,453
Minimum To Be Well Capitalized | $ 1,238,078 | $ 701,938
Tier 1 Capital to Risk Weighted Assets, Ratio |  |
Actual | 0.1377 | 0.1498
Minimum Capital Requirement | 0.0600 | 0.0600
Minimum To Be Well Capitalized | 0.0800 | 0.0800
Total Capital to Risk Weighted Assets, Amount |  |
Actual | $ 2,458,553 | $ 1,625,943
Minimum Capital Requirement | 1,238,078 | 701,938
Minimum To Be Well Capitalized | $ 1,547,597 | $ 877,422
Total Capital to Risk Weighted Assets, Ratio |  |
Actual | 0.1589 | 0.1853
Minimum Capital Requirement | 0.0800 | 0.0800
Minimum To Be Well Capitalized | 0.1000 | 0.1000
Leverage Ratio of Tier 1 Capital to Average Assets, Amount |  |
Actual | $ 2,130,732 | $ 1,314,301
Minimum Capital Requirement | $ 733,327 | $ 475,348
Leverage Ratio of Tier 1 Capital to Average Assets, Ratio |  |
Actual | 0.1162 | 0.1106
Minimum Capital Requirement | 0.0400 | 0.0400
Busey Bank |  |
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount |  |
Actual | $ 2,118,059 | $ 1,438,296
Minimum Capital Requirement | 694,126 | 393,277
Minimum To Be Well Capitalized | $ 1,002,626 | $ 568,067
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio |  |
Actual | 0.1373 | 0.1646
Minimum Capital Requirement | 0.0450 | 0.0450
Minimum To Be Well Capitalized | 0.0650 | 0.0650
Tier 1 Capital to Risk Weighted Assets, Amount |  |
Actual | $ 2,118,059 | $ 1,438,296
Minimum Capital Requirement | 925,501 | 524,369
Minimum To Be Well Capitalized | $ 1,234,002 | $ 699,159
Tier 1 Capital to Risk Weighted Assets, Ratio |  |
Actual | 0.1373 | 0.1646
Minimum Capital Requirement | 0.0600 | 0.0600
Minimum To Be Well Capitalized | 0.0800 | 0.0800
Total Capital to Risk Weighted Assets, Amount |  |
Actual | $ 2,262,302 | $ 1,520,938
Minimum Capital Requirement | 1,234,002 | 699,159
Minimum To Be Well Capitalized | $ 1,542,502 | $ 873,949
Total Capital to Risk Weighted Assets, Ratio |  |
Actual | 0.1467 | 0.1740
Minimum Capital Requirement | 0.0800 | 0.0800
Minimum To Be Well Capitalized | 0.1000 | 0.1000
Leverage Ratio of Tier 1 Capital to Average Assets, Amount |  |
Actual | $ 2,118,059 | $ 1,438,296
Minimum Capital Requirement | 731,219 | 473,878
Minimum To Be Well Capitalized | $ 914,024 | $ 592,347
Leverage Ratio of Tier 1 Capital to Average Assets, Ratio |  |
Actual | 0.1159 | 0.1214
Minimum Capital Requirement | 0.0400 | 0.0400
Minimum To Be Well Capitalized | 0.0500 | 0.0500

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