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REGULATORY CAPITAL - Capital Amounts and Ratios (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
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%