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REGULATORY CAPITAL - Capital Amounts and Ratios (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
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%