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Securities (Tables) | 3 Months Ended
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Mar. 31, 2026
Securities Available for Sale | This table provides detailed information about securities available for sale at March 31, 2026 and December 31, 2025 (in thousands):
March 31, 2026 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
U.S. Treasury |  | $ | 2,252,751 |  |  | $ | 8,082 |  |  | $ | (3,120 | ) |  | $ | 2,257,713 |
U.S. Agencies |  |  | 49,834 |  |  |  | 200 |  |  |  | (66 | ) |  |  | 49,968 |
Mortgage-backed |  |  | 8,589,349 |  |  |  | 42,549 |  |  |  | (344,025 | ) |  |  | 8,287,873 |
State and political subdivisions |  |  | 2,448,080 |  |  |  | 17,379 |  |  |  | (94,003 | ) |  |  | 2,371,456 |
Corporates |  |  | 142,631 |  |  |  | 267 |  |  |  | (3,217 | ) |  |  | 139,681 |
Collateralized loan obligations |  |  | 554,875 |  |  |  | 151 |  |  |  | (831 | ) |  |  | 554,195 |
Total |  | $ | 14,037,520 |  |  | $ | 68,628 |  |  | $ | (445,262 | ) |  | $ | 13,660,886 |
December 31, 2025 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
U.S. Treasury |  | $ | 2,301,248 |  |  | $ | 20,008 |  |  | $ | (441 | ) |  | $ | 2,320,815 |
U.S. Agencies |  |  | 62,069 |  |  |  | 401 |  |  |  | (100 | ) |  |  | 62,370 |
Mortgage-backed |  |  | 8,427,197 |  |  |  | 71,827 |  |  |  | (331,151 | ) |  |  | 8,167,873 |
State and political subdivisions |  |  | 2,494,537 |  |  |  | 24,898 |  |  |  | (72,847 | ) |  |  | 2,446,588 |
Corporates |  |  | 180,854 |  |  |  | 349 |  |  |  | (4,088 | ) |  |  | 177,115 |
Collateralized loan obligations |  |  | 533,995 |  |  |  | 504 |  |  |  | (119 | ) |  |  | 534,380 |
Total |  | $ | 13,999,900 |  |  | $ | 117,987 |  |  | $ | (408,746 | ) |  | $ | 13,709,141 |
Schedule of Sales of Securities Available for Sale | The following table presents the sales of securities available for sale for the three months ended March 31, 2026 and 2025 (in thousands):
|  | Three Months Ended March 31, |
|  | 2026 |  |  | 2025 |
Proceeds from sales |  | $ | 51,771 |  |  | $ | 611,423 |
Gross realized gains |  |  | 403 |  |  |  | 390 |
Gross realized losses |  |  | — |  |  |  | — |
Gross Unrealized Losses and Fair Value of Investment Securities Available for Sale | The following table shows the Company’s available-for-sale investments’ gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at March 31, 2026 and December 31, 2025 (in thousands):
|  | Less than 12 months |  |  | 12 months or more |  |  | Total |
March 31, 2026 |  | Count |  |  | Fair Value |  |  | Unrealized Losses |  |  | Count |  |  | Fair Value |  |  | Unrealized Losses |  |  | Count |  |  | Fair Value |  |  | Unrealized Losses |
Description of Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury |  |  | 77 |  |  | $ | 594,413 |  |  | $ | (2,942 | ) |  |  | 1 |  |  | $ | 14,815 |  |  | $ | (178 | ) |  |  | 78 |  |  | $ | 609,228 |  |  | $ | (3,120 | )
U.S. Agencies |  |  | 1 |  |  |  | 7,569 |  |  |  | (66 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1 |  |  |  | 7,569 |  |  |  | (66 | )
Mortgage-backed |  |  | 212 |  |  |  | 1,987,192 |  |  |  | (18,766 | ) |  |  | 798 |  |  |  | 2,696,163 |  |  |  | (325,259 | ) |  |  | 1,010 |  |  |  | 4,683,355 |  |  |  | (344,025 | )
State and political subdivisions |  |  | 474 |  |  |  | 631,510 |  |  |  | (14,306 | ) |  |  | 837 |  |  |  | 806,914 |  |  |  | (79,697 | ) |  |  | 1,311 |  |  |  | 1,438,424 |  |  |  | (94,003 | )
Corporates |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 89 |  |  |  | 120,650 |  |  |  | (3,217 | ) |  |  | 89 |  |  |  | 120,650 |  |  |  | (3,217 | )
Collateralized loan obligations |  |  | 32 |  |  |  | 317,287 |  |  |  | (788 | ) |  |  | 2 |  |  |  | 12,963 |  |  |  | (43 | ) |  |  | 34 |  |  |  | 330,250 |  |  |  | (831 | )
Total |  |  | 796 |  |  | $ | 3,537,971 |  |  | $ | (36,868 | ) |  |  | 1,727 |  |  | $ | 3,651,505 |  |  | $ | (408,394 | ) |  |  | 2,523 |  |  | $ | 7,189,476 |  |  | $ | (445,262 | )
|  | Less than 12 months |  |  | 12 months or more |  |  | Total |
December 31, 2025 |  | Count |  |  | Fair Value |  |  | Unrealized Losses |  |  | Count |  |  | Fair Value |  |  | Unrealized Losses |  |  | Count |  |  | Fair Value |  |  | Unrealized Losses |
Description of Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury |  |  | 8 |  |  | $ | 72,013 |  |  | $ | (88 | ) |  |  | 2 |  |  | $ | 30,234 |  |  | $ | (353 | ) |  |  | 10 |  |  | $ | 102,247 |  |  | $ | (441 | )
U.S. Agencies |  |  | 1 |  |  |  | 7,855 |  |  |  | (100 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1 |  |  |  | 7,855 |  |  |  | (100 | )
Mortgage-backed |  |  | 82 |  |  |  | 757,160 |  |  |  | (5,682 | ) |  |  | 817 |  |  |  | 2,871,729 |  |  |  | (325,469 | ) |  |  | 899 |  |  |  | 3,628,889 |  |  |  | (331,151 | )
State and political subdivisions |  |  | 152 |  |  |  | 515,364 |  |  |  | (11,181 | ) |  |  | 1,142 |  |  |  | 809,113 |  |  |  | (61,666 | ) |  |  | 1,294 |  |  |  | 1,324,477 |  |  |  | (72,847 | )
Corporates |  |  | 1 |  |  |  | 2,990 |  |  |  | (10 | ) |  |  | 134 |  |  |  | 164,108 |  |  |  | (4,078 | ) |  |  | 135 |  |  |  | 167,098 |  |  |  | (4,088 | )
Collateralized loan obligations |  |  | 20 |  |  |  | 164,531 |  |  |  | (112 | ) |  |  | 1 |  |  |  | 2,999 |  |  |  | (7 | ) |  |  | 21 |  |  |  | 167,530 |  |  |  | (119 | )
Total |  |  | 264 |  |  | $ | 1,519,913 |  |  | $ | (17,173 | ) |  |  | 2,096 |  |  | $ | 3,878,183 |  |  | $ | (391,573 | ) |  |  | 2,360 |  |  | $ | 5,398,096 |  |  | $ | (408,746 | )
Gross Unrealized Losses and Fair Value of Investment Securities Held to Maturity | The following table shows the Company’s held-to-maturity investments’ gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at March 31, 2026 and December 31, 2025, respectively (in thousands):
|  | Less than 12 months |  |  | 12 months or more |  |  | Total |
March 31, 2026 |  | Count |  |  | Fair Value |  |  | Unrealized Losses |  |  | Count |  |  | Fair Value |  |  | Unrealized Losses |  |  | Count |  |  | Fair Value |  |  | Unrealized Losses |
U.S. Treasury |  |  | 7 |  |  | $ | 37,958 |  |  | $ | (298 | ) |  |  | — |  |  | $ | — |  |  | $ | — |  |  |  | 7 |  |  | $ | 37,958 |  |  | $ | (298 | )
Mortgage-backed |  |  | 14 |  |  |  | 172,121 |  |  |  | (1,682 | ) |  |  | 262 |  |  |  | 1,951,706 |  |  |  | (306,012 | ) |  |  | 276 |  |  |  | 2,123,827 |  |  |  | (307,694 | )
State and political subdivisions |  |  | 260 |  |  |  | 949,911 |  |  |  | (55,117 | ) |  |  | 1,353 |  |  |  | 1,493,930 |  |  |  | (180,571 | ) |  |  | 1,613 |  |  |  | 2,443,841 |  |  |  | (235,688 | )
Total |  |  | 281 |  |  | $ | 1,159,990 |  |  | $ | (57,097 | ) |  |  | 1,615 |  |  | $ | 3,445,636 |  |  | $ | (486,583 | ) |  |  | 1,896 |  |  | $ | 4,605,626 |  |  | $ | (543,680 | )
|  | Less than 12 months |  |  | 12 months or more |  |  | Total |
December 31, 2025 |  | Count |  |  | Fair Value |  |  | Unrealized Losses |  |  | Count |  |  | Fair Value |  |  | Unrealized Losses |  |  | Count |  |  | Fair Value |  |  | Unrealized Losses |
U.S. Treasury |  |  | 3 |  |  | $ | 15,913 |  |  | $ | (37 | ) |  |  | — |  |  | $ | — |  |  | $ | — |  |  |  | 3 |  |  | $ | 15,913 |  |  | $ | (37 | )
Mortgage-backed |  |  | 10 |  |  |  | 147,066 |  |  |  | (918 | ) |  |  | 262 |  |  |  | 1,998,984 |  |  |  | (304,122 | ) |  |  | 272 |  |  |  | 2,146,050 |  |  |  | (305,040 | )
State and political subdivisions |  |  | 146 |  |  |  | 687,180 |  |  |  | (41,122 | ) |  |  | 1,354 |  |  |  | 1,480,709 |  |  |  | (154,638 | ) |  |  | 1,500 |  |  |  | 2,167,889 |  |  |  | (195,760 | )
Total |  |  | 159 |  |  | $ | 850,159 |  |  | $ | (42,077 | ) |  |  | 1,616 |  |  | $ | 3,479,693 |  |  | $ | (458,760 | ) |  |  | 1,775 |  |  | $ | 4,329,852 |  |  | $ | (500,837 | )
Schedule of Amortized Cost Basis by Credit Rating of Held to Maturity Investment | The following tables show the amortized cost basis by credit rating of the Company’s held-to-maturity State and political subdivisions bond investments at March 31, 2026 and December 31, 2025 (in thousands):
|  | Amortized Cost Basis by Credit Rating - HTM Debt Securities |
March 31, 2026 |  | AAA |  |  | AA |  |  | A |  |  | BBB |  |  | BB |  |  | B |  |  | CCC-C |  |  | Total |
State and political subdivisions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Competitive |  | $ | 47,376 |  |  | $ | 51,712 |  |  | $ | 372,892 |  |  | $ | 804,924 |  |  | $ | 30,295 |  |  | $ | 23,100 |  |  | $ | 13,604 |  |  | $ | 1,343,903 |
Utilities |  |  | 827,336 |  |  |  | 902,260 |  |  |  | 110,407 |  |  |  | 15,316 |  |  |  | 2,456 |  |  |  | — |  |  |  | — |  |  |  | 1,857,775 |
Total state and political subdivisions |  | $ | 874,712 |  |  | $ | 953,972 |  |  | $ | 483,299 |  |  | $ | 820,240 |  |  | $ | 32,751 |  |  | $ | 23,100 |  |  | $ | 13,604 |  |  | $ | 3,201,678 |
|  | Amortized Cost Basis by Credit Rating - HTM Debt Securities |
December 31, 2025 |  | AAA |  |  | AA |  |  | A |  |  | BBB |  |  | BB |  |  | B |  |  | CCC-C |  |  | Total |
State and political subdivisions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Competitive |  | $ | 46,933 |  |  | $ | 51,390 |  |  | $ | 379,973 |  |  | $ | 812,061 |  |  | $ | 34,105 |  |  | $ | 23,326 |  |  | $ | 14,424 |  |  | $ | 1,362,212 |
Utilities |  |  | 899,088 |  |  |  | 777,880 |  |  |  | 114,845 |  |  |  | 15,824 |  |  |  | 2,458 |  |  |  | — |  |  |  | — |  |  |  | 1,810,095 |
Total state and political subdivisions |  | $ | 946,021 |  |  | $ | 829,270 |  |  | $ | 494,818 |  |  | $ | 827,885 |  |  | $ | 36,563 |  |  | $ | 23,326 |  |  | $ | 14,424 |  |  | $ | 3,172,307 |
Schedule of Aging of Past due Held to Maturity Securities | The following table presents the aging of past due held-to-maturity securities at March 31, 2026 (in thousands):
March 31, 2026 |  | 30-89 Days Past Due and Accruing |  |  | Greater than 90 Days Past Due and Accruing |  |  | Non- Accrual |  |  | Total Past Due |  |  | Current |  |  | Total |
State and political subdivisions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Competitive |  | $ | 131 |  |  | $ | 16,470 |  |  | $ | — |  |  | $ | 16,601 |  |  | $ | 1,327,302 |  |  | $ | 1,343,903 |
Utilities |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,857,775 |  |  |  | 1,857,775 |
Total state and political subdivisions |  | $ | 131 |  |  | $ | 16,470 |  |  | $ | — |  |  | $ | 16,601 |  |  | $ | 3,185,077 |  |  | $ | 3,201,678 |
Schedule of Changes in Equity Securities Without Readily Determinable Fair Values | The table below presents the changes in equity securities without readily determinable fair values for the three months ended March 31, 2026 and 2025 (in thousands):
|  | Three Months Ended March 31, |
|  | 2026 |  |  | 2025 |
Beginning balance |  | $ | 524,112 |  |  | $ | 416,750 |
Acquisition of HTLF |  |  | — |  |  |  | 121,769 |
Purchases of securities |  |  | 33,664 |  |  |  | 24,003 |
Observable upward price adjustments |  |  | 3,568 |  |  |  | 1,022 |
Observable downward price adjustments |  |  | (636 | ) |  |  | (6,273 | )
Sales of securities and other activity |  |  | (25,382 | ) |  |  | (17,341 | )
Ending balance |  | $ | 535,326 |  |  | $ | 539,930 |
Schedule of Other Securities | The table below provides detailed information for Other securities at March 31, 2026 and December 31, 2025 (in thousands):
|  | March 31, 2026 |  |  | December 31, 2025 |
FRB and FHLB stock |  | $ | 137,660 |  |  | $ | 137,498 |
Equity securities with readily determinable fair values |  |  | 12,604 |  |  |  | 14,690 |
Equity securities without readily determinable fair values |  |  | 535,326 |  |  |  | 524,112 |
Total |  | $ | 685,590 |  |  | $ | 676,300 |
Schedule of Components of Investment Securities Gains (Losses), Net | The following table presents the components of Investment securities gains (losses), net for the three months ended March 31, 2026 and March 31, 2025 (in thousands):
|  | Three Months Ended March 31, |
|  | 2026 |  |  | 2025 |
Investment securities gains (losses), net |  |  |  |  |  |
Available-for-sale debt securities: |  |  |  |  |  |
Gains realized on sales |  | $ | 403 |  |  | $ | 390 |
Equity securities with readily determinable fair values: |  |  |  |  |  |
Fair value adjustments, net |  |  | (287 | ) |  |  | 144 |
Equity securities without readily determinable fair values: |  |  |  |  |  |
Fair value adjustments, net |  |  | 315 |  |  |  | (5,243 | )
Sales |  |  | 2,615 |  |  |  | (73 | )
Total investment securities gains (losses), net |  | $ | 3,046 |  |  | $ | (4,782 | )
Available-for-sale Securities [Member] |
Contractual Maturity Information | The following table presents contractual maturity information for securities available for sale at March 31, 2026 (in thousands):
|  | Amortized |  |  | Fair |
|  | Cost |  |  | Value |
Due in 1 year or less |  | $ | 776,270 |  |  | $ | 777,228 |
Due after 1 year through 5 years |  |  | 2,284,188 |  |  |  | 2,279,354 |
Due after 5 years through 10 years |  |  | 599,727 |  |  |  | 589,950 |
Due after 10 years |  |  | 1,787,986 |  |  |  | 1,726,481 |
Total |  |  | 5,448,171 |  |  |  | 5,373,013 |
Mortgage-backed securities |  |  | 8,589,349 |  |  |  | 8,287,873 |
Total securities available for sale |  | $ | 14,037,520 |  |  | $ | 13,660,886 |
Held-to-maturity Securities [Member] |
Contractual Maturity Information | The following table provides detailed information about securities held to maturity at March 31, 2026 and December 31, 2025, respectively (in thousands):
March 31, 2026 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Allowance for Credit Losses |  |  | Net Carrying Amount |
U.S. Treasury |  | $ | 38,256 |  |  | $ | — |  |  | $ | (298 | ) |  | $ | 37,958 |  |  | $ | — |  |  | $ | 38,256 |
Mortgage-backed |  |  | 2,463,304 |  |  |  | 87 |  |  |  | (307,694 | ) |  |  | 2,155,697 |  |  |  | — |  |  |  | 2,463,304 |
State and political subdivisions |  |  | 3,201,678 |  |  |  | 12,919 |  |  |  | (235,688 | ) |  |  | 2,978,909 |  |  |  | (3,357 | ) |  |  | 3,198,321 |
Total |  | $ | 5,703,238 |  |  | $ | 13,006 |  |  | $ | (543,680 | ) |  | $ | 5,172,564 |  |  | $ | (3,357 | ) |  | $ | 5,699,881 |
December 31, 2025 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Allowance for Credit Losses |  |  | Net Carrying Amount |
U.S. Treasury |  | $ | 38,253 |  |  | $ | 27 |  |  | $ | (37 | ) |  | $ | 38,243 |  |  | $ | — |  |  | $ | 38,253 |
Mortgage-backed |  |  | 2,513,667 |  |  |  | 335 |  |  |  | (305,040 | ) |  |  | 2,208,962 |  |  |  | — |  |  |  | 2,513,667 |
State and political subdivisions |  |  | 3,172,307 |  |  |  | 26,713 |  |  |  | (195,760 | ) |  |  | 3,003,260 |  |  |  | (1,684 | ) |  |  | 3,170,623 |
Total |  | $ | 5,724,227 |  |  | $ | 27,075 |  |  | $ | (500,837 | ) |  | $ | 5,250,465 |  |  | $ | (1,684 | ) |  | $ | 5,722,543 |
The following table presents contractual maturity information for securities held to maturity at March 31, 2026 (in thousands):
|  | Amortized |  |  | Fair |
|  | Cost |  |  | Value |
Due in 1 year or less |  | $ | 124,608 |  |  | $ | 124,506 |
Due after 1 year through 5 years |  |  | 420,999 |  |  |  | 410,094 |
Due after 5 years through 10 years |  |  | 862,412 |  |  |  | 823,822 |
Due after 10 years |  |  | 1,831,915 |  |  |  | 1,658,445 |
Total |  |  | 3,239,934 |  |  |  | 3,016,867 |
Mortgage-backed securities |  |  | 2,463,304 |  |  |  | 2,155,697 |
Total securities held to maturity |  | $ | 5,703,238 |  |  | $ | 5,172,564 |

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