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Regulatory Capital (Details)
$ in Thousands
 12 Months Ended
Jun. 01, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Total Capital (to Risk Weighted Assets), Amount      
Actual, Amount   $ 1,245,997 $ 1,036,143
Minimum Capital Requirement, Amount   585,015 590,826
Minimum To Be Well Capitalized, Amount   $ 731,269 $ 738,532
Total Capital (to Risk Weighted Assets), Ratio      
Actual, Ratio (as a percent)   17.04 14.03
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   $ 983,033 $ 922,395
Minimum Capital Requirement, Amount   438,761 443,120
Minimum To Be Well Capitalized, Amount   $ 585,015 $ 590,826
Tier 1 Capital (to Risk Weighted Assets), Ratio      
Actual, Ratio (as a percent)   13.44 12.49
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   $ 909,033 $ 848,395
Minimum Capital Requirement, Amount   329,071 332,340
Minimum To Be Well Capitalized, Amount   $ 475,325 $ 480,046
Common Equity Tier 1 Capital (to Risk Weighted Assets), Ratio      
Actual, Ratio (as a percent)   12.43% 11.49%
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   $ 983,033 $ 922,395
Minimum Capital Requirement, Amount   $ 401,717 $ 373,360
Tier 1 Capital (to Average Assets), Ratio      
Actual, Ratio (as a percent)   9.79 9.88
Minimum Capital Requirement, Ratio (as a percent)   4.00 4.00
Busey Bank paid dividends to the Company, amount received   $ 122,000 $ 70,000
Busey Bank      
Total Capital (to Risk Weighted Assets), Amount      
Actual, Amount   1,131,875 1,099,449
Minimum Capital Requirement, Amount   584,082 589,681
Minimum To Be Well Capitalized, Amount   $ 730,103 $ 737,101
Total Capital (to Risk Weighted Assets), Ratio      
Actual, Ratio (as a percent)   15.50 14.92
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   $ 1,053,910 $ 1,045,701
Minimum Capital Requirement, Amount   438,062 442,261
Minimum To Be Well Capitalized, Amount   $ 584,082 $ 589,681
Tier 1 Capital (to Risk Weighted Assets), Ratio      
Actual, Ratio (as a percent)   14.44 14.19
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   $ 1,053,910 $ 1,045,701
Minimum Capital Requirement, Amount   328,546 331,696
Minimum To Be Well Capitalized, Amount   $ 474,567 $ 479,116
Common Equity Tier 1 Capital (to Risk Weighted Assets), Ratio      
Actual, Ratio (as a percent)   14.44% 14.19%
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   $ 1,053,910 $ 1,045,701
Minimum Capital Requirement, Amount   400,581 373,639
Minimum To Be Well Capitalized, Amount   $ 500,727 $ 467,049
Tier 1 Capital (to Average Assets), Ratio      
Actual, Ratio (as a percent)   10.52 11.19
Minimum Capital Requirement, Ratio (as a percent)   4.00 4.00
Minimum To Be Well Capitalized, Ratio (as a percent)   5.00 5.00
Subordinated debt | 5.25% fixed-to-floating rate notes due 2030      
Regulatory Capital      
Proceeds from public offering $ 125,000