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REGULATORY CAPITAL - Capital Amounts and Ratios (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Common Equity Tier 1 Capital to Risk Weighted Assets, Amount |  |
Actual | $ 1,155,973 | $ 1,081,686
Minimum Capital Requirement | 397,331 | 406,980
Minimum To Be Well Capitalized | $ 573,923 | $ 587,861
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio |  |
Actual | 13.09% | 11.96%
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 | $ 1,229,973 | $ 1,155,686
Minimum Capital Requirement | 529,775 | 542,640
Minimum To Be Well Capitalized | $ 706,367 | $ 723,521
Tier 1 Capital to Risk Weighted Assets, Ratio |  |
Actual | 13.93% | 12.78%
Minimum Capital Requirement | 6.00% | 6.00%
Minimum To Be Well Capitalized | 8.00% | 8.00%
Total Capital to Risk Weighted Assets, Amount |  |
Actual | $ 1,540,318 | $ 1,457,994
Minimum Capital Requirement | 706,367 | 723,521
Minimum To Be Well Capitalized | $ 882,958 | $ 904,401
Total Capital to Risk Weighted Assets, Ratio |  |
Actual | 17.44% | 16.12%
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 | $ 1,229,973 | $ 1,155,686
Minimum Capital Requirement | $ 488,315 | $ 489,124
Leverage Ratio of Tier 1 Capital to Average Assets, Ratio |  |
Actual | 10.08% | 9.45%
Minimum Capital Requirement | 4.00% | 4.00%
Busey Bank |  |
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount |  |
Actual | $ 1,362,962 | $ 1,306,716
Minimum Capital Requirement | 396,128 | 405,736
Minimum To Be Well Capitalized | $ 572,185 | $ 586,063
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio |  |
Actual | 15.48% | 14.49%
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 | $ 1,362,962 | $ 1,306,716
Minimum Capital Requirement | 528,171 | 540,981
Minimum To Be Well Capitalized | $ 704,228 | $ 721,308
Tier 1 Capital to Risk Weighted Assets, Ratio |  |
Actual | 15.48% | 14.49%
Minimum Capital Requirement | 6.00% | 6.00%
Minimum To Be Well Capitalized | 8.00% | 8.00%
Total Capital to Risk Weighted Assets, Amount |  |
Actual | $ 1,448,307 | $ 1,384,024
Minimum Capital Requirement | 704,228 | 721,308
Minimum To Be Well Capitalized | $ 880,285 | $ 901,635
Total Capital to Risk Weighted Assets, Ratio |  |
Actual | 16.45% | 15.35%
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 | $ 1,362,962 | $ 1,306,716
Minimum Capital Requirement | 487,103 | 487,541
Minimum To Be Well Capitalized | $ 608,879 | $ 609,426
Leverage Ratio of Tier 1 Capital to Average Assets, Ratio |  |
Actual | 11.19% | 10.72%
Minimum Capital Requirement | 4.00% | 4.00%
Minimum To Be Well Capitalized | 5.00% | 5.00%

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