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Pay vs Performance Disclosure | 12 Months Ended
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Dec. 31, 2024 USD ($) $ / shares | Dec. 31, 2023 USD ($) $ / shares | Dec. 31, 2022 USD ($) $ / shares | Dec. 31, 2021 USD ($) $ / shares | Dec. 31, 2020 USD ($) $ / shares
Pay vs Performance Disclosure |  |  |  |  |
Pay vs Performance Disclosure, Table |
Year |  | Total Compensation for CEO |  | Compensation Actually Paid to CEO 1 |  | Average Total for Other NEOs |  | Average Compensation Actually Paid to Other NEOs 1 |  | Value of $100 Initial Fixed Investment Based on TSR 2 |  | Value of $100 Initial Fixed Investment Based on 10-K Peer Group TSR 3 |  | Net income ($000's) |  | Company Selected Measure - Core Earnings Per Share 4
2024 |  | $ | 2,847,082 |  |  | $ | 2,431,467 |  |  | $ | 1,362,825 |  |  | $ | 1,196,424 |  |  | $ | 105 |  |  | $ | 122 |  |  | $ | 113,691 |  |  | $ | 2.08 |
2023 |  | $ | 2,179,159 |  |  | $ | 2,542,829 |  |  | $ | 1,079,862 |  |  | $ | 674,115 |  |  | $ | 107 |  |  | $ | 100 |  |  | $ | 122,565 |  |  | $ | 2.24 |
2022 |  | $ | 2,494,467 |  |  | $ | 2,234,208 |  |  | $ | 1,272,385 |  |  | $ | 1,162,227 |  |  | $ | 101 |  |  | $ | 98 |  |  | $ | 128,311 |  |  | $ | 2.35 |
2021 |  | $ | 2,116,540 |  |  | $ | 3,053,103 |  |  | $ | 1,096,599 |  |  | $ | 1,630,556 |  |  | $ | 107 |  |  | $ | 114 |  |  | $ | 123,449 |  |  | $ | 2.45 |
2020 |  | $ | 2,443,872 |  |  | $ | 2,009,636 |  |  | $ | 1,268,627 |  |  | $ | 1,163,770 |  |  | $ | 82 |  |  | $ | 86 |  |  | $ | 100,344 |  |  | $ | 1.98 |
Company Selected Measure Name | Core Earnings Per Share |  |  |  |
Named Executive Officers, Footnote | Jeffrey D. Jones Amy L. Randolph John J. Powers Monica L. Bowe(b) |  |  |  |
Peer Group Issuers, Footnote | Based on initial investment of  $100 as of December 31, 2019, and a cumulative Total Shareholder Return of First Busey and S&P U.S. BMI Banks — Midwest Region. |  |  |  |
PEO Total Compensation Amount | $ 2,847,082 | $ 2,179,159 | $ 2,494,467 | $ 2,116,540 | $ 2,443,872
PEO Actually Paid Compensation Amount | $ 2,431,467 | 2,542,829 | 2,234,208 | 3,053,103 | 2,009,636
Adjustment To PEO Compensation, Footnote | Amounts represent executive compensation actually paid to our CEO and the average executive compensation actually paid to our NEOs for the relevant fiscal year. Executive compensation actually paid to our NEOs represents the “Total” compensation reported in the Summary Compensation Table for the applicable fiscal year, adjusted as follows:
|  | 2024
Summary Compensation for CEO Van A. Dukeman |  | $ | 2,847,082 |
Deduction for amounts reported under the “Stock Awards” and “Option Awards” columns in the Summary Compensation Table |  | $ | (928,963) |
Addition for the fair value of equity awards granted and related dividend equivalents during the year that remain outstanding and unvested as of year-end |  | $ | 773,997 |
Addition for the change in fair value of awards granted in prior years that were unvested as of year-end and related dividend equivalents |  | $ | 25,452 |
Addition for the change in fair value of awards granted in prior years that vested during year and dividends paid |  | $ | (286,101) |
Compensation Actually Paid to CEO |  | $ | 2,431,467 |
|  | 2024
Average Summary Compensation for NEOs |  | $ | 1,362,825 |
Deduction for amounts reported under the “Stock Awards” and “Option Awards” columns in the Summary Compensation Table |  | $ | (403,359) |
Addition for the fair value of equity awards granted and related dividend equivalents during the year that remain outstanding and unvested as of year-end |  | $ | 336,078 |
Addition for the change in fair value of awards granted in prior years that were unvested as of year-end and related dividend equivalents |  | $ | 10,294 |
Addition for the change in fair value of awards granted in prior years that vested during year and dividends paid |  | $ | (109,414) |
Average Compensation Actually Paid to NEOs |  | $ | 1,196,424 |
NEOs included in Average Summary Compensation and average compensation actually paid(a) |  |
Jeffrey D. Jones Amy L. Randolph John J. Powers Monica L. Bowe(b) |  |
___________________________________________ (a)Robin N. Elliott was an NEO in 2020, 2021, 2022 and 2023 and was therefore included for those years. (b)Ms. Bowe was not an NEO in 2020, 2021 or 2022 and was therefore not included for those years. |  |  |  |
Non-PEO NEO Average Total Compensation Amount | $ 1,362,825 | 1,079,862 | 1,272,385 | 1,096,599 | 1,268,627
Non-PEO NEO Average Compensation Actually Paid Amount | $ 1,196,424 | 674,115 | 1,162,227 | 1,630,556 | 1,163,770
Adjustment to Non-PEO NEO Compensation Footnote | Amounts represent executive compensation actually paid to our CEO and the average executive compensation actually paid to our NEOs for the relevant fiscal year. Executive compensation actually paid to our NEOs represents the “Total” compensation reported in the Summary Compensation Table for the applicable fiscal year, adjusted as follows:
|  | 2024
Summary Compensation for CEO Van A. Dukeman |  | $ | 2,847,082 |
Deduction for amounts reported under the “Stock Awards” and “Option Awards” columns in the Summary Compensation Table |  | $ | (928,963) |
Addition for the fair value of equity awards granted and related dividend equivalents during the year that remain outstanding and unvested as of year-end |  | $ | 773,997 |
Addition for the change in fair value of awards granted in prior years that were unvested as of year-end and related dividend equivalents |  | $ | 25,452 |
Addition for the change in fair value of awards granted in prior years that vested during year and dividends paid |  | $ | (286,101) |
Compensation Actually Paid to CEO |  | $ | 2,431,467 |
|  | 2024
Average Summary Compensation for NEOs |  | $ | 1,362,825 |
Deduction for amounts reported under the “Stock Awards” and “Option Awards” columns in the Summary Compensation Table |  | $ | (403,359) |
Addition for the fair value of equity awards granted and related dividend equivalents during the year that remain outstanding and unvested as of year-end |  | $ | 336,078 |
Addition for the change in fair value of awards granted in prior years that were unvested as of year-end and related dividend equivalents |  | $ | 10,294 |
Addition for the change in fair value of awards granted in prior years that vested during year and dividends paid |  | $ | (109,414) |
Average Compensation Actually Paid to NEOs |  | $ | 1,196,424 |
NEOs included in Average Summary Compensation and average compensation actually paid(a) |  |
Jeffrey D. Jones Amy L. Randolph John J. Powers Monica L. Bowe(b) |  |
___________________________________________ (a)Robin N. Elliott was an NEO in 2020, 2021, 2022 and 2023 and was therefore included for those years. (b)Ms. Bowe was not an NEO in 2020, 2021 or 2022 and was therefore not included for those years. |  |  |  |
Compensation Actually Paid vs. Total Shareholder Return |  |  |  |  |
Compensation Actually Paid vs. Net Income |  |  |  |  |
Compensation Actually Paid vs. Company Selected Measure |  |  |  |  |
Total Shareholder Return Vs Peer Group |  |  |  |  |
Tabular List, Table | Core Earnings Per Share •Asset Quality Ratio •Core Return on average Tangible Common Equity •Relative Total Shareholder Return •Non-Bank Revenue •Net Promoter Score •Gallup Engagement Score |  |  |  |
Total Shareholder Return Amount | $ 105 | 107 | 101 | 107 | 82
Peer Group Total Shareholder Return Amount | 122 | 100 | 98 | 114 | 86
Net Income (Loss) | $ 113,691,000 | $ 122,565,000 | $ 128,311,000 | $ 123,449,000 | $ 100,344,000
Company Selected Measure Amount | $ / shares | 2.08 | 2.24 | 2.35 | 2.45 | 1.98
PEO Name | Van A. Dukeman |  |  |  |
Additional 402(v) Disclosure | Based on initial investment of  $100 as of December 31, 2019. |  |  |  |
Measure:: 1 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Core Earnings Per Share |  |  |  |
Non-GAAP Measure Description | Core Earnings Per Share is the same as adjusted diluted earnings per share, a non-GAAP financial measure. Adjusted diluted earnings per share equals (i) the sum of (A) net income, plus (B) acquisition expenses, restructuring expenses and the tax benefit related to such expenses, divided by (ii) the weighted average number of common shares outstanding on a diluted basis. For additional information on adjusted diluted earnings per share and a reconciliation to the most directly comparable GAAP financial measure, see the Company’s Annual Report on Form 10‑K for the year ended December 31, 2024 under the heading “Non-GAAP Financial Information.” |  |  |  |
Measure:: 2 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Asset Quality Ratio |  |  |  |
Measure:: 3 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Core Return on average Tangible Common Equity |  |  |  |
Measure:: 4 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Relative Total Shareholder Return |  |  |  |
Measure:: 5 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Non-Bank Revenue |  |  |  |
Measure:: 6 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Net Promoter Score |  |  |  |
Measure:: 7 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Gallup Engagement Score |  |  |  |
PEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | $ (928,963) |  |  |  |
PEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 773,997 |  |  |  |
PEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested, And Dividends Paid on Equity Awards not Otherwise Reflected in Total Compensation [Member] |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 25,452 |  |  |  |
PEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year, And Dividends Paid on Equity Awards not Otherwise Reflected in Total Compensation [Member] |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | (286,101) |  |  |  |
Non-PEO NEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | (403,359) |  |  |  |
Non-PEO NEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 336,078 |  |  |  |
Non-PEO NEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested, And Dividends Paid on Equity Awards not Otherwise Reflected in Total Compensation [Member] |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 10,294 |  |  |  |
Non-PEO NEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year, And Dividends Paid on Equity Awards not Otherwise Reflected in Total Compensation [Member] |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | $ (109,414) |  |  |  |

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