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Regulatory Capital - Capital Amounts and Ratios (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount    
Actual $ 1,144,403 $ 1,081,686
Minimum Capital Requirement 411,165 406,980
Minimum To Be Well Capitalized $ 593,905 $ 587,861
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio    
Actual 12.52% 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 $ 1,218,403 $ 1,155,686
Minimum Capital Requirement 548,220 542,640
Minimum To Be Well Capitalized $ 730,960 $ 723,521
Tier 1 Capital to Risk Weighted Assets, Ratio    
Actual 13.33% 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 $ 1,527,627 $ 1,457,994
Minimum Capital Requirement 730,960 723,521
Minimum To Be Well Capitalized $ 913,700 $ 904,401
Total Capital to Risk Weighted Assets, Ratio    
Actual 16.72% 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 $ 1,218,403 $ 1,155,686
Minimum Capital Requirement $ 483,272 $ 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 $ 1,356,565 $ 1,306,716
Minimum Capital Requirement 409,979 405,736
Minimum To Be Well Capitalized $ 592,192 $ 586,063
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio    
Actual 14.89% 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 $ 1,356,565 $ 1,306,716
Minimum Capital Requirement 546,639 540,981
Minimum To Be Well Capitalized $ 728,852 $ 721,308
Tier 1 Capital to Risk Weighted Assets, Ratio    
Actual 14.89% 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 $ 1,440,789 $ 1,384,024
Minimum Capital Requirement 728,852 721,308
Minimum To Be Well Capitalized $ 911,064 $ 901,635
Total Capital to Risk Weighted Assets, Ratio    
Actual 15.81% 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 $ 1,356,565 $ 1,306,716
Minimum Capital Requirement 481,856 487,541
Minimum To Be Well Capitalized $ 602,321 $ 609,426
Leverage Ratio of Tier 1 Capital to Average Assets, Ratio    
Actual 11.26% 10.72%
Minimum Capital Requirement 4.00% 4.00%
Minimum To Be Well Capitalized 5.00% 5.00%