REGULATORY CAPITAL (Tables)

12 Months Ended

Dec. 31, 2023

Banking and Thrift, Other Disclosure [Abstract]

Schedule of applicable holding company and bank regulatory capital requirements

The following tables summarize regulatory capital requirements applicable to Busey and its subsidiary bank (dollars in thousands):

	As of December 31, 2023
	Actual				Minimum Capital Requirement				Minimum To Be Well Capitalized
	Amount		Ratio		Amount		Ratio		Amount		Ratio
Common equity Tier 1 capital to risk weighted assets
First Busey	$	1,155,973	13.09	%	$	397,331	4.50	%	$	573,923	6.50	%
Busey Bank	$	1,362,962	15.48	%	$	396,128	4.50	%	$	572,185	6.50	%
Tier 1 capital to risk weighted assets
First Busey	$	1,229,973	13.93	%	$	529,775	6.00	%	$	706,367	8.00	%
Busey Bank	$	1,362,962	15.48	%	$	528,171	6.00	%	$	704,228	8.00	%
Total capital to risk weighted assets
First Busey	$	1,540,318	17.44	%	$	706,367	8.00	%	$	882,958	10.00	%
Busey Bank	$	1,448,307	16.45	%	$	704,228	8.00	%	$	880,285	10.00	%
Leverage ratio of Tier 1 capital to average assets
First Busey	$	1,229,973	10.08	%	$	488,315	4.00	%	N/A		N/A
Busey Bank	$	1,362,962	11.19	%	$	487,103	4.00	%	$	608,879	5.00	%

	As of December 31, 2022
	Actual				Minimum Capital Requirement				Minimum To Be Well Capitalized
	Amount		Ratio		Amount		Ratio		Amount		Ratio
Common equity Tier 1 capital to risk weighted assets
First Busey	$	1,081,686	11.96	%	$	406,980	4.50	%	$	587,861	6.50	%
Busey Bank	$	1,306,716	14.49	%	$	405,736	4.50	%	$	586,063	6.50	%
Tier 1 capital to risk weighted assets
First Busey	$	1,155,686	12.78	%	$	542,640	6.00	%	$	723,521	8.00	%
Busey Bank	$	1,306,716	14.49	%	$	540,981	6.00	%	$	721,308	8.00	%
Total capital to risk weighted assets
First Busey	$	1,457,994	16.12	%	$	723,521	8.00	%	$	904,401	10.00	%
Busey Bank	$	1,384,024	15.35	%	$	721,308	8.00	%	$	901,635	10.00	%
Leverage ratio of Tier 1 capital to average assets
First Busey	$	1,155,686	9.45	%	$	489,124	4.00	%	N/A		N/A
Busey Bank	$	1,306,716	10.72	%	$	487,541	4.00	%	$	609,426	5.00	%