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REGULATORY CAPITAL - Schedule of Regulatory Capital Requirements Applicable to Busey and Busey Bank (Details) $ in Thousands | Jun. 30, 2025 USD ($) | Dec. 31, 2024 USD ($)
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Common Equity Tier 1 Capital to Risk Weighted Assets, Amount |  |
Actual | $ 1,888,100 | $ 1,237,301
Minimum Capital Requirement | 695,299 | 394,840
Minimum To Be Well Capitalized | $ 1,004,321 | $ 570,325
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio |  |
Actual | 0.1222 | 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 | $ 2,110,850 | $ 1,314,301
Minimum Capital Requirement | 927,065 | 526,453
Minimum To Be Well Capitalized | $ 1,236,087 | $ 701,938
Tier 1 Capital to Risk Weighted Assets, Ratio |  |
Actual | 0.1366 | 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 | $ 2,434,172 | $ 1,625,943
Minimum Capital Requirement | 1,236,087 | 701,938
Minimum To Be Well Capitalized | $ 1,545,109 | $ 877,422
Total Capital to Risk Weighted Assets, Ratio |  |
Actual | 0.1575 | 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 | $ 2,110,850 | $ 1,314,301
Minimum Capital Requirement | $ 749,585 | $ 475,348
Leverage Ratio of Tier 1 Capital to Average Assets, Ratio |  |
Actual | 0.1126 | 0.1106
Minimum Capital Requirement | 0.0400 | 0.0400
Busey Bank |  |
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount |  |
Actual | $ 2,098,016 | $ 1,438,296
Minimum Capital Requirement | 692,964 | 393,277
Minimum To Be Well Capitalized | $ 1,000,949 | $ 568,067
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio |  |
Actual | 0.1362 | 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 | $ 2,098,016 | $ 1,438,296
Minimum Capital Requirement | 923,953 | 524,369
Minimum To Be Well Capitalized | $ 1,231,937 | $ 699,159
Tier 1 Capital to Risk Weighted Assets, Ratio |  |
Actual | 0.1362 | 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 | $ 2,237,760 | $ 1,520,938
Minimum Capital Requirement | 1,231,937 | 699,159
Minimum To Be Well Capitalized | $ 1,539,921 | $ 873,949
Total Capital to Risk Weighted Assets, Ratio |  |
Actual | 0.1453 | 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 | $ 2,098,016 | $ 1,438,296
Minimum Capital Requirement | 747,971 | 473,878
Minimum To Be Well Capitalized | $ 934,963 | $ 592,347
Leverage Ratio of Tier 1 Capital to Average Assets, Ratio |  |
Actual | 0.1122 | 0.1214
Minimum Capital Requirement | 0.0400 | 0.0400
Minimum To Be Well Capitalized | 0.0500 | 0.0500

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