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Regulatory Capital (Details)
$ in Thousands
Sep. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Total Capital (to Risk Weighted Assets), Amount    
Actual, Amount $ 1,313,989 $ 1,245,997
Minimum Capital Requirement, Amount 660,850 585,015
Minimum To Be Well Capitalized, Amount $ 826,062 $ 731,269
Total Capital (to Risk Weighted Assets), Ratio    
Actual, Ratio (as a percent) 15.91 17.04
Minimum Capital Requirement, Ratio (as a percent) 8.00 8.00
Minimum To Be Well Capitalized, Ratio (as a percent) 10.00 10.00
Tier 1 Capital (to Risk Weighted Assets), Amount    
Actual, Amount $ 1,060,756 $ 983,033
Minimum Capital Requirement, Amount 495,637 438,761
Minimum To Be Well Capitalized, Amount $ 660,850 $ 585,015
Tier 1 Capital (to Risk Weighted Assets), Ratio    
Actual, Ratio (as a percent) 12.84 13.44
Minimum Capital Requirement, Ratio (as a percent) 6.00 6.00
Minimum To Be Well Capitalized, Ratio (as a percent) 8.00 8.00
Common Equity Tier 1 Capital (to Risk Weighted Assets), Amount    
Actual, Amount $ 986,756 $ 909,033
Minimum Capital Requirement, Amount 371,728 329,071
Minimum To Be Well Capitalized, Amount $ 536,940 $ 475,325
Common Equity Tier 1 Capital (to Risk Weighted Assets), Ratio    
Actual, Ratio (as a percent) 11.95% 12.43%
Minimum Capital Requirement, Ratio (as a percent) 4.50% 4.50%
Minimum To Be Well Capitalized, Ratio (as a percent) 6.50% 6.50%
Tier 1 Capital (to Average Assets), Amount    
Actual, Amount $ 1,060,756 $ 983,033
Minimum Capital Requirement, Amount $ 493,201 $ 401,717
Tier 1 Capital (to Average Assets), Ratio    
Actual, Ratio (as a percent) 8.60 9.79
Minimum Capital Requirement, Ratio (as a percent) 4.00 4.00
Busey Bank    
Total Capital (to Risk Weighted Assets), Amount    
Actual, Amount $ 1,306,293 $ 1,131,875
Minimum Capital Requirement, Amount 658,612 584,082
Minimum To Be Well Capitalized, Amount $ 823,265 $ 730,103
Total Capital (to Risk Weighted Assets), Ratio    
Actual, Ratio (as a percent) 15.87 15.50
Minimum Capital Requirement, Ratio (as a percent) 8.00 8.00
Minimum To Be Well Capitalized, Ratio (as a percent) 10.00 10.00
Tier 1 Capital (to Risk Weighted Assets), Amount    
Actual, Amount $ 1,238,060 $ 1,053,910
Minimum Capital Requirement, Amount 493,959 438,062
Minimum To Be Well Capitalized, Amount $ 658,612 $ 584,082
Tier 1 Capital (to Risk Weighted Assets), Ratio    
Actual, Ratio (as a percent) 15.04 14.44
Minimum Capital Requirement, Ratio (as a percent) 6.00 6.00
Minimum To Be Well Capitalized, Ratio (as a percent) 8.00 8.00
Common Equity Tier 1 Capital (to Risk Weighted Assets), Amount    
Actual, Amount $ 1,238,060 $ 1,053,910
Minimum Capital Requirement, Amount 370,469 328,546
Minimum To Be Well Capitalized, Amount $ 535,123 $ 474,567
Common Equity Tier 1 Capital (to Risk Weighted Assets), Ratio    
Actual, Ratio (as a percent) 15.04% 14.44%
Minimum Capital Requirement, Ratio (as a percent) 4.50% 4.50%
Minimum To Be Well Capitalized, Ratio (as a percent) 6.50% 6.50%
Tier 1 Capital (to Average Assets), Amount    
Actual, Amount $ 1,238,060 $ 1,053,910
Minimum Capital Requirement, Amount 492,170 400,581
Minimum To Be Well Capitalized, Amount $ 615,212 $ 500,727
Tier 1 Capital (to Average Assets), Ratio    
Actual, Ratio (as a percent) 10.06 10.52
Minimum Capital Requirement, Ratio (as a percent) 4.00 4.00
Minimum To Be Well Capitalized, Ratio (as a percent) 5.00 5.00