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REGULATORY CAPITAL - Schedule of Regulatory Capital Requirements Applicable to Busey and Busey Bank (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
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Common Equity Tier 1 Capital to Risk Weighted Assets, Amount |  |
Actual | $ 1,198,039 | $ 1,155,973
Minimum Capital Requirement | 408,526 | 397,331
Minimum To Be Well Capitalized | $ 590,093 | $ 573,923
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio |  |
Actual | 13.20% | 13.09%
Minimum Capital Requirement | 4.50% | 4.50%
Minimum To Be Well Capitalized | 6.50% | 6.50%
Tier 1 Capital to Risk Weighted Assets, Amount |  |
Actual | $ 1,275,039 | $ 1,229,973
Minimum Capital Requirement | 544,702 | 529,775
Minimum To Be Well Capitalized | $ 726,269 | $ 706,367
Tier 1 Capital to Risk Weighted Assets, Ratio |  |
Actual | 14.04% | 13.93%
Minimum Capital Requirement | 6.00% | 6.00%
Minimum To Be Well Capitalized | 8.00% | 8.00%
Total Capital to Risk Weighted Assets, Amount |  |
Actual | $ 1,588,551 | $ 1,540,318
Minimum Capital Requirement | 726,269 | 706,367
Minimum To Be Well Capitalized | $ 907,836 | $ 882,958
Total Capital to Risk Weighted Assets, Ratio |  |
Actual | 17.50% | 17.44%
Minimum Capital Requirement | 8.00% | 8.00%
Minimum To Be Well Capitalized | 10.00% | 10.00%
Leverage Ratio of Tier 1 Capital to Average Assets, Amount |  |
Actual | $ 1,275,039 | $ 1,229,973
Minimum Capital Requirement | $ 476,875 | $ 488,315
Leverage Ratio of Tier 1 Capital to Average Assets, Ratio |  |
Actual | 10.69% | 10.08%
Minimum Capital Requirement | 4.00% | 4.00%
Busey Bank |  |
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount |  |
Actual | $ 1,410,287 | $ 1,362,962
Minimum Capital Requirement | 406,982 | 396,128
Minimum To Be Well Capitalized | $ 587,863 | $ 572,185
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio |  |
Actual | 15.59% | 15.48%
Minimum Capital Requirement | 4.50% | 4.50%
Minimum To Be Well Capitalized | 6.50% | 6.50%
Tier 1 Capital to Risk Weighted Assets, Amount |  |
Actual | $ 1,410,287 | $ 1,362,962
Minimum Capital Requirement | 542,642 | 528,171
Minimum To Be Well Capitalized | $ 723,523 | $ 704,228
Tier 1 Capital to Risk Weighted Assets, Ratio |  |
Actual | 15.59% | 15.48%
Minimum Capital Requirement | 6.00% | 6.00%
Minimum To Be Well Capitalized | 8.00% | 8.00%
Total Capital to Risk Weighted Assets, Amount |  |
Actual | $ 1,496,048 | $ 1,448,307
Minimum Capital Requirement | 723,523 | 704,228
Minimum To Be Well Capitalized | $ 904,404 | $ 880,285
Total Capital to Risk Weighted Assets, Ratio |  |
Actual | 16.54% | 16.45%
Minimum Capital Requirement | 8.00% | 8.00%
Minimum To Be Well Capitalized | 10.00% | 10.00%
Leverage Ratio of Tier 1 Capital to Average Assets, Amount |  |
Actual | $ 1,410,287 | $ 1,362,962
Minimum Capital Requirement | 477,039 | 487,103
Minimum To Be Well Capitalized | $ 596,299 | $ 608,879
Leverage Ratio of Tier 1 Capital to Average Assets, Ratio |  |
Actual | 11.83% | 11.19%
Minimum Capital Requirement | 4.00% | 4.00%
Minimum To Be Well Capitalized | 5.00% | 5.00%

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