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REGULATORY CAPITAL
 3 Months Ended
Mar. 31, 2024
Banking and Thrift, Other Disclosure [Abstract]  
REGULATORY CAPITAL REGULATORY CAPITAL
Busey and Busey Bank are subject to various regulatory capital requirements administered by federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory—and possibly additional discretionary—actions by regulators that, if undertaken, could have a direct material effect on Busey's consolidated financial statements. Capital amounts and classification also are subject to qualitative judgments by regulators about components, risk weightings, and other factors.
Banking regulations identify five capital categories for insured depository institutions: well capitalized, adequately capitalized, undercapitalized, significantly undercapitalized, and critically undercapitalized. As of March 31, 2024, and December 31, 2023, all capital ratios of Busey and Busey Bank exceeded well capitalized levels under the applicable regulatory capital adequacy guidelines. Management believes that no events or changes have occurred subsequent to March 31, 2024, that would change this designation.
Current Expected Credit Loss Model
On August 26, 2020, the FDIC and other federal banking agencies adopted a final rule which provided banking organizations that adopted CECL during 2020 with the option to delay for two years the estimated impact of CECL on regulatory capital and to phase in the aggregate impact of the deferral on regulatory capital over a subsequent three-year period. Under this final rule, because Busey elected to use the deferral option, the regulatory capital impact of our transition adjustments recorded on January 1, 2020, arising from the adoption of CECL, was deferred for two years. In addition, 25 percent of the ongoing impact of CECL on our ACL, retained earnings, and average total consolidated assets from January 1, 2020, through the end of the two-year deferral period, each as reported for regulatory capital purposes, has been added to the deferred transition amounts (“adjusted transition amounts”) and deferred for the two-year period. On January 1, 2022, at the conclusion of the two-year period, the adjusted transition amounts began to be phased-in for regulatory capital purposes at a rate of 25 percent per year, with the phased-in amounts included in regulatory capital at the beginning of each year.
Capital Amounts and Ratios
The following tables summarize regulatory capital requirements applicable to Busey and Busey Bank (dollars in thousands):
As of March 31, 2024
ActualMinimum
Capital Requirement		Minimum
To Be Well
Capitalized
AmountRatio AmountRatio AmountRatio
Common equity Tier 1 capital to risk weighted assets
First Busey$1,166,919 13.45 %$390,433 4.50 %$563,958 6.50 %
Busey Bank$1,365,033 15.79 %$389,113 4.50 %$562,052 6.50 %
Tier 1 capital to risk weighted assets
First Busey$1,240,919 14.30 %$520,577 6.00 %$694,103 8.00 %
Busey Bank$1,365,033 15.79 %$518,817 6.00 %$691,756 8.00 %
Total capital to risk weighted assets
First Busey$1,557,137 17.95 %$694,103 8.00 %$867,628 10.00 %
Busey Bank$1,456,250 16.84 %$691,756 8.00 %$864,695 10.00 %
Leverage ratio of Tier 1 capital to average assets
First Busey$1,240,919 10.46 %$474,678 4.00 % N/AN/A
Busey Bank$1,365,033 11.53 %$473,422 4.00 %$591,777 5.00 %
As of December 31, 2023
ActualMinimum
Capital Requirement		Minimum
To Be Well
Capitalized
AmountRatio AmountRatio AmountRatio
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/AN/A
Busey Bank$1,362,962 11.19 %$487,103 4.00 %$608,879 5.00 %
Capital Conservation Buffer
In July 2013, U.S. federal banking authorities approved the Basel III Rule for strengthening international capital standards. The Basel III Rule introduced a capital conservation buffer, composed entirely of common equity Tier 1 capital, which is added to the minimum risk-weighted asset ratios. The capital conservation buffer is not a minimum capital requirement; however, banking institutions with a ratio of common equity Tier 1 capital to risk-weighted assets below the capital conservation buffer will face constraints on dividends, equity repurchases, and discretionary bonus payments based on the amount of the shortfall. In order to refrain from restrictions on dividends, equity repurchases, and discretionary bonus payments, banking institutions must maintain minimum ratios of (1) common equity Tier 1 capital to risk-weighted assets of at least 7.0%, (2) Tier 1 capital to risk-weighted assets of at least 8.5%, and (3) total capital to risk-weighted assets of at least 10.5%.