REGULATORY CAPITAL (Tables)

3 Months Ended

Mar. 31, 2026

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 March 31, 2026
	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	$	1,880,068	12.31	%	$	687,386	4.50	%	$	992,892	6.50	%
Busey Bank	$	2,144,335	14.06	%	$	686,292	4.50	%	$	991,311	6.50	%
Tier 1 capital to risk weighted assets
First Busey	$	2,102,818	13.77	%	$	916,515	6.00	%	$	1,222,020	8.00	%
Busey Bank	$	2,144,335	14.06	%	$	915,057	6.00	%	$	1,220,075	8.00	%
Total capital to risk weighted assets
First Busey	$	2,423,843	15.87	%	$	1,222,020	8.00	%	$	1,527,525	10.00	%
Busey Bank	$	2,285,782	14.99	%	$	1,220,075	8.00	%	$	1,525,094	10.00	%
Leverage ratio of Tier 1 capital to average assets
First Busey	$	2,102,818	11.88	%	$	708,101	4.00	%	N/A		N/A
Busey Bank	$	2,144,335	12.14	%	$	706,482	4.00	%	$	883,103	5.00	%

	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	%