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REGULATORY CAPITAL - Capital Amounts and Ratios (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Common Equity Tier 1 Capital to Risk Weighted Assets, Amount |  |
Actual | $ 1,166,919 | $ 1,155,973
Minimum Capital Requirement | 390,433 | 397,331
Minimum To Be Well Capitalized | $ 563,958 | $ 573,923
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio |  |
Actual | 13.45% | 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 | $ 1,240,919 | $ 1,229,973
Minimum Capital Requirement | 520,577 | 529,775
Minimum To Be Well Capitalized | $ 694,103 | $ 706,367
Tier 1 Capital to Risk Weighted Assets, Ratio |  |
Actual | 14.30% | 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 | $ 1,557,137 | $ 1,540,318
Minimum Capital Requirement | 694,103 | 706,367
Minimum To Be Well Capitalized | $ 867,628 | $ 882,958
Total Capital to Risk Weighted Assets, Ratio |  |
Actual | 17.95% | 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 | $ 1,240,919 | $ 1,229,973
Minimum Capital Requirement | $ 474,678 | $ 488,315
Leverage Ratio of Tier 1 Capital to Average Assets, Ratio |  |
Actual | 10.46% | 10.08%
Minimum Capital Requirement | 4.00% | 4.00%
Busey Bank |  |
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount |  |
Actual | $ 1,365,033 | $ 1,362,962
Minimum Capital Requirement | 389,113 | 396,128
Minimum To Be Well Capitalized | $ 562,052 | $ 572,185
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio |  |
Actual | 15.79% | 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 | $ 1,365,033 | $ 1,362,962
Minimum Capital Requirement | 518,817 | 528,171
Minimum To Be Well Capitalized | $ 691,756 | $ 704,228
Tier 1 Capital to Risk Weighted Assets, Ratio |  |
Actual | 15.79% | 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 | $ 1,456,250 | $ 1,448,307
Minimum Capital Requirement | 691,756 | 704,228
Minimum To Be Well Capitalized | $ 864,695 | $ 880,285
Total Capital to Risk Weighted Assets, Ratio |  |
Actual | 16.84% | 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 | $ 1,365,033 | $ 1,362,962
Minimum Capital Requirement | 473,422 | 487,103
Minimum To Be Well Capitalized | $ 591,777 | $ 608,879
Leverage Ratio of Tier 1 Capital to Average Assets, Ratio |  |
Actual | 11.53% | 11.19%
Minimum Capital Requirement | 4.00% | 4.00%
Minimum To Be Well Capitalized | 5.00% | 5.00%

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