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DEBT SECURITIES (Tables)
 6 Months Ended
Jun. 30, 2025
Investments, Debt and Equity Securities [Abstract]  
Schedule of Amortized Cost, Unrealized or Unrecognized Gains and Losses and Fair Values of Securities Classified Available for Sale and Held to Maturity The tables below provide the amortized cost, unrealized or unrecognized gains and losses, and fair values of debt securities summarized by major category:
As of June 30, 2025
(dollars in thousands)
Amortized
Cost
Unrealized
Fair
Value
Gross Gains
Gross Losses
Debt securities available for sale1
Obligations of U.S. government corporations and agencies
$115,902 $59 $(404)$115,557 
Obligations of states and political subdivisions
260,997 131 (18,975)242,153 
Asset-backed securities
373,231 390 — 373,621 
Commercial mortgage-backed securities
149,844 479 (12,297)138,026 
Residential mortgage-backed securities
1,433,077 3,870 (147,818)1,289,129 
Corporate debt securities
61,613 427 (2,738)59,302 
Total debt securities available for sale$2,394,664 $5,356 $(182,232)$2,217,788 
Amortized
Cost
Unrecognized
Fair
Value
Gross Gains
Gross Losses
Debt securities held to maturity
Commercial mortgage-backed securities
$407,401 $— $(70,772)$336,629 
Residential mortgage-backed securities
395,564 — (61,661)333,903 
Total debt securities held to maturity$802,965 $— $(132,433)$670,532 
___________________________________________
1.This table includes debt securities marked at par, with no gain or loss.
As of December 31, 2024
(dollars in thousands)
Amortized
Cost
Unrealized
Fair
Value
Gross Gains
Gross Losses
Debt securities available for sale1
Obligations of U.S. government corporations and agencies
$1,408 $— $(8)$1,400 
Obligations of states and political subdivisions
156,534 31 (16,736)139,829 
Asset-backed securities
336,379 181 (3)336,557 
Commercial mortgage-backed securities
107,305 — (15,131)92,174 
Residential mortgage-backed securities
1,279,090 19 (191,899)1,087,210 
Corporate debt securities
159,236 363 (6,548)153,051 
Total debt securities available for sale
$2,039,952 $594 $(230,325)$1,810,221 
Amortized
Cost
Unrecognized
Fair
Value
Gross Gains
Gross Losses
Debt securities held to maturity
Commercial mortgage-backed securities
$415,530 $— $(77,242)$338,288 
Residential mortgage-backed securities
411,100 — (74,335)336,765 
Total debt securities held to maturity
$826,630 $— $(151,577)$675,053 
___________________________________________
1.This table includes debt securities marked at par, with no gain or loss.
Schedule of Maturities Of Debt Securities All mortgage-backed securities were issued by U.S. government corporations and agencies.
As of June 30, 2025
(dollars in thousands)Amortized
Cost		Fair
Value
Debt securities available for sale
Due in one year or less$27,262 $27,134 
Due after one year through five years52,667 50,135 
Due after five years through ten years446,705 431,576 
Due after ten years1,868,030 1,708,943 
Debt securities available for sale$2,394,664 $2,217,788 
 
Debt securities held to maturity
Due in one year or less$16,804 $16,708 
Due after one year through five years59,889 57,757 
Due after five years through ten years14,710 13,127 
Due after ten years711,562 582,940 
Debt securities held to maturity$802,965 $670,532 
Schedule of Gains and Losses on Debt Securities Available for Sale
Realized gains and losses related to sales and calls of debt securities available for sale are summarized as follows:
Three Months Ended June 30,Six Months Ended June 30,
(dollars in thousands)2025202420252024
Realized gains and losses on debt securities
Gross gains on debt securities
$1 $— $9 $1 
Gross (losses) on debt securities1
0(4)(15,545)(6,807)
Realized net gains (losses) on debt securities$1 $(4)$(15,536)$(6,806)
___________________________________________
1.During the first quarter of 2025, Busey sold available for sale debt securities with a book value of approximately $205.6 million for a pre-tax loss of $15.5 million, as part of a balance sheet repositioning strategy. During the first quarter of 2024, Busey sold available for sale debt securities with a book value of approximately $108.2 million for a pre-tax loss of $6.8 million, as part of a balance sheet repositioning strategy.
Schedule of Debt Securities in an Unrealized or Unrecognized Loss Position
The following information pertains to debt securities with gross unrealized or unrecognized losses, aggregated by investment category and the length of time that individual securities have been in a continuous loss position:
As of June 30, 2025
Less than 12 months12 months or moreTotal
(dollars in thousands)Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
Debt securities available for sale
Obligations of U.S. government corporations and agencies
$94,032 $(403)$152 $(1)$94,184 $(404)
Obligations of states and political subdivisions126,519 (7,390)96,547 (11,585)223,066 (18,975)
Commercial mortgage-backed securities7,914 (62)72,293 (12,235)80,207 (12,297)
Residential mortgage-backed securities125,548 (385)796,367 (147,433)921,915 (147,818)
Corporate debt securities933 (6)47,744 (2,732)48,677 (2,738)
Debt securities available for sale with gross unrealized losses$354,946 $(8,246)$1,013,103 $(173,986)$1,368,049 $(182,232)
Fair
Value		Unrecognized
Losses		Fair
Value		Unrecognized
Losses
Debt securities held to maturity
Commercial mortgage-backed securities$336,629 $(70,772)$336,629 $(70,772)
Residential mortgage-backed securities333,903 (61,661)333,903 (61,661)
Debt securities held to maturity with gross unrecognized losses$670,532 $(132,433)$670,532 $(132,433)
As of December 31, 2024
Less than 12 months12 months or moreTotal
(dollars in thousands)Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
Debt securities available for sale
Obligations of U.S. government corporations and agencies
$— $— $1,328 $(8)$1,328 $(8)
Obligations of states and political subdivisions
11,234 (209)119,723 (16,527)130,957 (16,736)
Asset-backed securities
14,997 (3)— — 14,997 (3)
Commercial mortgage-backed securities
6,238 (42)85,936 (15,089)92,174 (15,131)
Residential mortgage-backed securities
152,081 (640)930,642 (191,259)1,082,723 (191,899)
Corporate debt securities
598 (1)143,966 (6,547)144,564 (6,548)
Debt securities available for sale with gross unrealized losses$185,148 $(895)$1,281,595 $(229,430)$1,466,743 $(230,325)
Fair
Value		Unrecognized
Losses		Fair
Value		Unrecognized
Losses
Debt securities held to maturity
Commercial mortgage-backed securities
$338,288 $(77,242)$338,288 $(77,242)
Residential mortgage-backed securities
336,765 (74,335)336,765 (74,335)
Debt securities held to maturity with gross unrecognized losses$675,053 $(151,577)$675,053 $(151,577)
Additional information about debt securities in an unrealized or unrecognized loss position is presented in the tables below:
As of June 30, 2025
(dollars in thousands)Available for Sale Held to Maturity Total
Debt securities with gross unrealized or unrecognized losses, fair value$1,368,049 $670,532 $2,038,581 
Gross unrealized or unrecognized losses on debt securities182,232 132,433 314,665 
Ratio of gross unrealized or unrecognized losses to debt securities with gross unrealized or unrecognized losses13.3 %19.8 %15.4 %
 
Count of debt securities657 55 712 
Count of debt securities in an unrealized or unrecognized loss position502 55 557 
As of December 31, 2024
(dollars in thousands)Available for Sale Held to MaturityTotal
Debt securities with gross unrealized or unrecognized losses, fair value$1,466,743 $675,053 $2,141,796 
Gross unrealized or unrecognized losses on debt securities230,325 151,577 381,902 
Ratio of gross unrealized or unrecognized losses to debt securities with gross unrealized or unrecognized losses15.7 %22.5 %17.8 %
 
Count of debt securities677 55 732 
Count of debt securities in an unrealized or unrecognized loss position586 55 641