REGULATORY CAPITAL (Tables)

12 Months Ended

Dec. 31, 2025

Banking and Thrift, Other Disclosure [Abstract]

Schedule of Regulatory Capital Requirements Applicable to Busey and Busey Bank

The following tables summarize regulatory capital requirements applicable to First Busey and Busey Bank:

	As of December 31, 2025
	Actual				Minimum Capital Requirement				Minimum To Be Well Capitalized
(dollars in thousands)	Amount		Ratio		Amount		Ratio		Amount		Ratio
Common equity Tier 1 capital to risk weighted assets
First Busey	$	1,920,388	12.43	%	$	694,987	4.50	%	$	1,003,870	6.50	%
Busey Bank	$	2,150,048	13.97	%	$	692,654	4.50	%	$	1,000,500	6.50	%
Tier 1 capital to risk weighted assets
First Busey	$	2,143,138	13.88	%	$	926,650	6.00	%	$	1,235,533	8.00	%
Busey Bank	$	2,150,048	13.97	%	$	923,539	6.00	%	$	1,231,385	8.00	%
Total capital to risk weighted assets
First Busey	$	2,459,847	15.93	%	$	1,235,533	8.00	%	$	1,544,416	10.00	%
Busey Bank	$	2,287,179	14.86	%	$	1,231,385	8.00	%	$	1,539,231	10.00	%
Leverage ratio of Tier 1 capital to average assets
First Busey	$	2,143,138	11.93	%	$	718,334	4.00	%	N/A		N/A
Busey Bank	$	2,150,048	12.00	%	$	716,476	4.00	%	$	895,596	5.00	%

	As of December 31, 2024
	Actual				Minimum Capital Requirement				Minimum To Be Well Capitalized
(dollars in thousands)	Amount		Ratio		Amount		Ratio		Amount		Ratio
Common equity Tier 1 capital to risk weighted assets
First Busey	$	1,237,301	14.10	%	$	394,840	4.50	%	$	570,325	6.50	%
Busey Bank	$	1,438,296	16.46	%	$	393,277	4.50	%	$	568,067	6.50	%
Tier 1 capital to risk weighted assets
First Busey	$	1,314,301	14.98	%	$	526,453	6.00	%	$	701,938	8.00	%
Busey Bank	$	1,438,296	16.46	%	$	524,369	6.00	%	$	699,159	8.00	%
Total capital to risk weighted assets
First Busey	$	1,625,943	18.53	%	$	701,938	8.00	%	$	877,422	10.00	%
Busey Bank	$	1,520,938	17.40	%	$	699,159	8.00	%	$	873,949	10.00	%
Leverage ratio of Tier 1 capital to average assets
First Busey	$	1,314,301	11.06	%	$	475,348	4.00	%	N/A		N/A
Busey Bank	$	1,438,296	12.14	%	$	473,878	4.00	%	$	592,347	5.00	%