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Regulatory Capital - Capital Amounts and Ratios (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount    
Actual $ 1,056,206 $ 995,874
Minimum Capital Requirement 403,047 378,334
Minimum To Be Well Capitalized $ 582,179 $ 546,482
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio    
Actual 11.79% 11.85%
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 $ 1,130,206 $ 1,069,874
Minimum Capital Requirement 537,396 504,445
Minimum To Be Well Capitalized $ 716,528 $ 672,594
Tier 1 Capital to Risk Weighted Assets, Ratio    
Actual 12.62% 12.73%
Minimum Capital Requirement 6.00% 6.00%
Minimum To Be Well Capitalized 8.00% 8.00%
Total Capital to Risk Weighted Assets, Amount    
Actual $ 1,431,308 $ 1,320,187
Minimum Capital Requirement 716,528 672,594
Minimum To Be Well Capitalized $ 895,660 $ 840,742
Total Capital to Risk Weighted Assets, Ratio    
Actual 15.98% 15.70%
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 $ 1,130,206 $ 1,069,874
Minimum Capital Requirement $ 494,124 $ 502,336
Leverage Ratio of Tier 1 Capital to Average Assets, Ratio    
Actual 9.15% 8.52%
Minimum Capital Requirement 4.00% 4.00%
Busey Bank    
Common Equity Tier 1 Capital to Risk Weighted Assets, Amount    
Actual $ 1,288,945 $ 1,241,303
Minimum Capital Requirement 401,307 377,096
Minimum To Be Well Capitalized $ 579,665 $ 544,695
Common Equity Tier 1 Capital to Risk Weighted Assets, Ratio    
Actual 14.45% 14.81%
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 $ 1,288,945 $ 1,241,303
Minimum Capital Requirement 535,076 502,795
Minimum To Be Well Capitalized $ 713,434 $ 670,394
Tier 1 Capital to Risk Weighted Assets, Ratio    
Actual 14.45% 14.81%
Minimum Capital Requirement 6.00% 6.00%
Minimum To Be Well Capitalized 8.00% 8.00%
Total Capital to Risk Weighted Assets, Amount    
Actual $ 1,365,046 $ 1,306,616
Minimum Capital Requirement 713,434 670,394
Minimum To Be Well Capitalized $ 891,793 $ 837,992
Total Capital to Risk Weighted Assets, Ratio    
Actual 15.31% 15.59%
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 $ 1,288,945 $ 1,241,303
Minimum Capital Requirement 492,534 501,104
Minimum To Be Well Capitalized $ 615,668 $ 626,379
Leverage Ratio of Tier 1 Capital to Average Assets, Ratio    
Actual 10.47% 9.91%
Minimum Capital Requirement 4.00% 4.00%
Minimum To Be Well Capitalized 5.00% 5.00%