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Regulatory Capital - Capital Amounts and Ratios (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount    
Actual $ 1,103,960 $ 1,081,686
Minimum Capital Requirement 407,938 406,980
Minimum To Be Well Capitalized $ 589,243 $ 587,861
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio    
Actual 12.18% 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 $ 1,177,960 $ 1,155,686
Minimum Capital Requirement 543,917 542,640
Minimum To Be Well Capitalized $ 725,222 $ 723,521
Tier 1 Capital to Risk Weighted Assets, Ratio    
Actual 12.99% 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 $ 1,486,577 $ 1,457,994
Minimum Capital Requirement 725,222 723,521
Minimum To Be Well Capitalized $ 906,528 $ 904,401
Total Capital to Risk Weighted Assets, Ratio    
Actual 16.40% 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 $ 1,177,960 $ 1,081,686
Minimum Capital Requirement $ 485,472 $ 489,124
Leverage Ratio of Tier 1 Capital to Average Assets, Ratio    
Actual 9.71% 9.45%
Minimum Capital Requirement 4.00% 4.00%
Busey Bank    
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount    
Actual $ 1,325,556 $ 1,306,716
Minimum Capital Requirement 406,788 405,736
Minimum To Be Well Capitalized $ 587,582 $ 586,063
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio    
Actual 14.66% 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 $ 1,325,556 $ 1,306,716
Minimum Capital Requirement 542,383 540,981
Minimum To Be Well Capitalized $ 723,178 $ 721,308
Tier 1 Capital to Risk Weighted Assets, Ratio    
Actual 14.66% 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 $ 1,409,173 $ 1,384,024
Minimum Capital Requirement 723,178 721,308
Minimum To Be Well Capitalized $ 903,972 $ 901,635
Total Capital to Risk Weighted Assets, Ratio    
Actual 15.59% 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 $ 1,325,556 $ 1,306,716
Minimum Capital Requirement 484,256 487,541
Minimum To Be Well Capitalized $ 605,320 $ 609,426
Leverage Ratio of Tier 1 Capital to Average Assets, Ratio    
Actual 10.95% 10.72%
Minimum Capital Requirement 4.00% 4.00%
Minimum To Be Well Capitalized 5.00% 5.00%