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Securities (Tables) | 9 Months Ended
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Sep. 30, 2025
Securities Available for Sale | This table provides detailed information about securities available for sale at September 30, 2025 and December 31, 2024 (in thousands):
September 30, 2025 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
U.S. Treasury |  | $ | 2,180,744 |  |  | $ | 17,757 |  |  | $ | (750 | ) |  | $ | 2,197,751 |
U.S. Agencies |  |  | 81,171 |  |  |  | 422 |  |  |  | (167 | ) |  |  | 81,426 |
Mortgage-backed |  |  | 8,160,828 |  |  |  | 55,196 |  |  |  | (373,749 | ) |  |  | 7,842,275 |
State and political subdivisions |  |  | 2,541,797 |  |  |  | 23,996 |  |  |  | (86,291 | ) |  |  | 2,479,502 |
Corporates |  |  | 228,546 |  |  |  | 217 |  |  |  | (6,227 | ) |  |  | 222,536 |
Collateralized loan obligations |  |  | 554,063 |  |  |  | 878 |  |  |  | (151 | ) |  |  | 554,790 |
Total |  | $ | 13,747,149 |  |  | $ | 98,466 |  |  | $ | (467,335 | ) |  | $ | 13,378,280 |
December 31, 2024 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
U.S. Treasury |  | $ | 1,331,394 |  |  | $ | 2,751 |  |  | $ | (8,072 | ) |  | $ | 1,326,073 |
U.S. Agencies |  |  | 129,246 |  |  |  | 126 |  |  |  | (325 | ) |  |  | 129,047 |
Mortgage-backed |  |  | 4,945,548 |  |  |  | 339 |  |  |  | (524,957 | ) |  |  | 4,420,930 |
State and political subdivisions |  |  | 1,309,126 |  |  |  | 487 |  |  |  | (91,044 | ) |  |  | 1,218,569 |
Corporates |  |  | 330,739 |  |  |  | 60 |  |  |  | (13,629 | ) |  |  | 317,170 |
Collateralized loan obligations |  |  | 361,623 |  |  |  | 1,060 |  |  |  | (138 | ) |  |  | 362,545 |
Total |  | $ | 8,407,676 |  |  | $ | 4,823 |  |  | $ | (638,165 | ) |  | $ | 7,774,334 |
Schedule of Sales of Securities Available for Sale | The following table presents the sales of securities available for sale for the three and nine months ended September 30, 2025 and 2024 (in thousands):
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Proceeds from sales |  | $ | 7,871 |  |  | $ | — |  |  | $ | 624,225 |  |  | $ | 19,154 |
Gross realized gains |  |  | 91 |  |  |  | — |  |  |  | 514 |  |  |  | 139 |
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 September 30, 2025 and December 31, 2024 (in thousands):
|  | Less than 12 months |  |  | 12 months or more |  |  | Total |
September 30, 2025 |  | Count |  |  | Fair Value |  |  | Unrealized Losses |  |  | Count |  |  | Fair Value |  |  | Unrealized Losses |  |  | Count |  |  | Fair Value |  |  | Unrealized Losses |
Description of Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury |  |  | 7 |  |  | $ | 79,522 |  |  | $ | (168 | ) |  |  | 7 |  |  | $ | 75,611 |  |  | $ | (582 | ) |  |  | 14 |  |  | $ | 155,133 |  |  | $ | (750 | )
U.S. Agencies |  |  | 1 |  |  |  | 8,583 |  |  |  | (167 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1 |  |  |  | 8,583 |  |  |  | (167 | )
Mortgage-backed |  |  | 99 |  |  |  | 697,377 |  |  |  | (3,896 | ) |  |  | 829 |  |  |  | 2,951,837 |  |  |  | (369,853 | ) |  |  | 928 |  |  |  | 3,649,214 |  |  |  | (373,749 | )
State and political subdivisions |  |  | 147 |  |  |  | 610,974 |  |  |  | (17,306 | ) |  |  | 1,215 |  |  |  | 800,722 |  |  |  | (68,985 | ) |  |  | 1,362 |  |  |  | 1,411,696 |  |  |  | (86,291 | )
Corporates |  |  | 2 |  |  |  | 2,244 |  |  |  | (6 | ) |  |  | 161 |  |  |  | 194,933 |  |  |  | (6,221 | ) |  |  | 163 |  |  |  | 197,177 |  |  |  | (6,227 | )
Collateralized loan obligations |  |  | 11 |  |  |  | 109,671 |  |  |  | (102 | ) |  |  | 3 |  |  |  | 15,847 |  |  |  | (49 | ) |  |  | 14 |  |  |  | 125,518 |  |  |  | (151 | )
Total |  |  | 267 |  |  | $ | 1,508,371 |  |  | $ | (21,645 | ) |  |  | 2,215 |  |  | $ | 4,038,950 |  |  | $ | (445,690 | ) |  |  | 2,482 |  |  | $ | 5,547,321 |  |  | $ | (467,335 | )
|  | Less than 12 months |  |  | 12 months or more |  |  | Total |
December 31, 2024 |  | Count |  |  | Fair Value |  |  | Unrealized Losses |  |  | Count |  |  | Fair Value |  |  | Unrealized Losses |  |  | Count |  |  | Fair Value |  |  | Unrealized Losses |
Description of Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury |  |  | 93 |  |  | $ | 635,739 |  |  | $ | (6,319 | ) |  |  | 9 |  |  | $ | 142,518 |  |  | $ | (1,753 | ) |  |  | 102 |  |  | $ | 778,257 |  |  | $ | (8,072 | )
U.S. Agencies |  |  | 4 |  |  |  | 20,858 |  |  |  | (46 | ) |  |  | 5 |  |  |  | 56,712 |  |  |  | (279 | ) |  |  | 9 |  |  |  | 77,570 |  |  |  | (325 | )
Mortgage-backed |  |  | 159 |  |  |  | 1,293,953 |  |  |  | (22,468 | ) |  |  | 834 |  |  |  | 3,055,882 |  |  |  | (502,489 | ) |  |  | 993 |  |  |  | 4,349,835 |  |  |  | (524,957 | )
State and political subdivisions |  |  | 264 |  |  |  | 173,006 |  |  |  | (2,392 | ) |  |  | 1,629 |  |  |  | 953,458 |  |  |  | (88,652 | ) |  |  | 1,893 |  |  |  | 1,126,464 |  |  |  | (91,044 | )
Corporates |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 239 |  |  |  | 315,109 |  |  |  | (13,629 | ) |  |  | 239 |  |  |  | 315,109 |  |  |  | (13,629 | )
Collateralized loan obligations |  |  | 7 |  |  |  | 47,222 |  |  |  | (88 | ) |  |  | 5 |  |  |  | 30,521 |  |  |  | (50 | ) |  |  | 12 |  |  |  | 77,743 |  |  |  | (138 | )
Total |  |  | 527 |  |  | $ | 2,170,778 |  |  | $ | (31,313 | ) |  |  | 2,721 |  |  | $ | 4,554,200 |  |  | $ | (606,852 | ) |  |  | 3,248 |  |  | $ | 6,724,978 |  |  | $ | (638,165 | )
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 September 30, 2025 and December 31, 2024, respectively (in thousands):
|  | Less than 12 months |  |  | 12 months or more |  |  | Total |
September 30, 2025 |  | Count |  |  | Fair Value |  |  | Unrealized Losses |  |  | Count |  |  | Fair Value |  |  | Unrealized Losses |  |  | Count |  |  | Fair Value |  |  | Unrealized Losses |
U.S. Treasury |  |  | 6 |  |  | $ | 30,638 |  |  | $ | (115 | ) |  |  | — |  |  | $ | — |  |  | $ | — |  |  |  | 6 |  |  | $ | 30,638 |  |  | $ | (115 | )
U.S. Agencies |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Mortgage-backed |  |  | 12 |  |  |  | 104,013 |  |  |  | (1,198 | ) |  |  | 262 |  |  |  | 2,037,057 |  |  |  | (322,126 | ) |  |  | 274 |  |  |  | 2,141,070 |  |  |  | (323,324 | )
State and political subdivisions |  |  | 151 |  |  |  | 727,606 |  |  |  | (48,914 | ) |  |  | 1,353 |  |  |  | 1,468,551 |  |  |  | (175,424 | ) |  |  | 1,504 |  |  |  | 2,196,157 |  |  |  | (224,338 | )
Total |  |  | 169 |  |  | $ | 862,257 |  |  | $ | (50,227 | ) |  |  | 1,615 |  |  | $ | 3,505,608 |  |  | $ | (497,550 | ) |  |  | 1,784 |  |  | $ | 4,367,865 |  |  | $ | (547,777 | )
|  | Less than 12 months |  |  | 12 months or more |  |  | Total |
December 31, 2024 |  | Count |  |  | Fair Value |  |  | Unrealized Losses |  |  | Count |  |  | Fair Value |  |  | Unrealized Losses |  |  | Count |  |  | Fair Value |  |  | Unrealized Losses |
U.S. Agencies |  |  | — |  |  | $ | — |  |  | $ | — |  |  |  | 10 |  |  | $ | 115,750 |  |  | $ | (581 | ) |  |  | 10 |  |  | $ | 115,750 |  |  | $ | (581 | )
Mortgage-backed |  |  | 6 |  |  |  | 3,527 |  |  |  | (103 | ) |  |  | 263 |  |  |  | 2,101,125 |  |  |  | (418,379 | ) |  |  | 269 |  |  |  | 2,104,652 |  |  |  | (418,482 | )
State and political subdivisions |  |  | 47 |  |  |  | 52,468 |  |  |  | (2,030 | ) |  |  | 1,414 |  |  |  | 1,972,927 |  |  |  | (220,916 | ) |  |  | 1,461 |  |  |  | 2,025,395 |  |  |  | (222,946 | )
Total |  |  | 53 |  |  | $ | 55,995 |  |  | $ | (2,133 | ) |  |  | 1,687 |  |  | $ | 4,189,802 |  |  | $ | (639,876 | ) |  |  | 1,740 |  |  | $ | 4,245,797 |  |  | $ | (642,009 | )
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 September 30, 2025 and December 31, 2024 (in thousands):
|  | Amortized Cost Basis by Credit Rating - HTM Debt Securities |
September 30, 2025 |  | AAA |  |  | AA |  |  | A |  |  | BBB |  |  | BB |  |  | B |  |  | CCC-C |  |  | Total |
State and political subdivisions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Competitive |  | $ | 48,372 |  |  | $ | 51,835 |  |  | $ | 401,250 |  |  | $ | 797,970 |  |  | $ | 41,021 |  |  | $ | 23,551 |  |  | $ | 14,721 |  |  | $ | 1,378,720 |
Utilities |  |  | 774,751 |  |  |  | 754,910 |  |  |  | 110,326 |  |  |  | 22,895 |  |  |  | 673 |  |  |  | — |  |  |  | — |  |  |  | 1,663,555 |
Total state and political subdivisions |  | $ | 823,123 |  |  | $ | 806,745 |  |  | $ | 511,576 |  |  | $ | 820,865 |  |  | $ | 41,694 |  |  | $ | 23,551 |  |  | $ | 14,721 |  |  | $ | 3,042,275 |
|  | Amortized Cost Basis by Credit Rating - HTM Debt Securities |
December 31, 2024 |  | AAA |  |  | AA |  |  | A |  |  | BBB |  |  | BB |  |  | CCC-C |  |  | Total |
State and political subdivisions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Competitive |  | $ | — |  |  | $ | — |  |  | $ | 424,690 |  |  | $ | 610,351 |  |  | $ | 36,628 |  |  | $ | 21,990 |  |  | $ | 1,093,659 |
Utilities |  |  | 759,798 |  |  |  | 761,706 |  |  |  | 99,127 |  |  |  | 24,509 |  |  |  | 648 |  |  |  | — |  |  |  | 1,645,788 |
Total state and political subdivisions |  | $ | 759,798 |  |  | $ | 761,706 |  |  | $ | 523,817 |  |  | $ | 634,860 |  |  | $ | 37,276 |  |  | $ | 21,990 |  |  | $ | 2,739,447 |
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 and nine months ended September 30, 2025 and 2024 (in thousands):
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Beginning balance |  | $ | 533,749 |  |  | $ | 371,123 |  |  | $ | 416,750 |  |  | $ | 394,035 |
Acquisition of HTLF |  |  | (19,675 | ) |  |  | — |  |  |  | 103,211 |  |  |  | — |
Purchases of securities |  |  | 34,919 |  |  |  | 33,397 |  |  |  | 83,749 |  |  |  | 45,154 |
Observable upward price adjustments |  |  | 3,462 |  |  |  | 2,552 |  |  |  | 13,895 |  |  |  | 15,740 |
Observable downward price adjustments |  |  | (653 | ) |  |  | (268 | ) |  |  | (9,228 | ) |  |  | (6,042 | )
Sales of securities and other activity |  |  | (10,783 | ) |  |  | (7,032 | ) |  |  | (67,358 | ) |  |  | (49,115 | )
Ending balance |  | $ | 541,019 |  |  | $ | 399,772 |  |  | $ | 541,019 |  |  | $ | 399,772 |
Schedule of Other Securities | The table below provides detailed information for Other securities at September 30, 2025 and December 31, 2024 (in thousands):
|  | September 30, 2025 |  |  | December 31, 2024 |
FRB and FHLB stock |  | $ | 137,406 |  |  | $ | 42,672 |
Equity securities with readily determinable fair values |  |  | 41,150 |  |  |  | 11,596 |
Equity securities without readily determinable fair values |  |  | 541,019 |  |  |  | 416,750 |
Total |  | $ | 719,575 |  |  | $ | 471,018 |
Schedule of Components of Investment Securities (Losses) Gains, Net | The following table presents the components of Investment securities (losses) gains, net for the three and nine months ended September 30, 2025 and September 30, 2024 (in thousands):
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Investment securities (losses) gains, net |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale debt securities: |  |  |  |  |  |  |  |  |  |  |  |
Gains realized on sales |  | $ | 91 |  |  | $ | — |  |  | $ | 514 |  |  | $ | 139 |
Equity securities with readily determinable fair values: |  |  |  |  |  |  |  |  |  |  |  |
Fair value adjustments, net |  |  | (7,103 | ) |  |  | 340 |  |  |  | 22,513 |  |  |  | 291 |
Equity securities without readily determinable fair values: |  |  |  |  |  |  |  |  |  |  |  |
Fair value adjustments, net |  |  | 2,919 |  |  |  | 738 |  |  |  | (2,384 | ) |  |  | (2,277 | )
Sales |  |  | — |  |  |  | 1,545 |  |  |  | 8,167 |  |  |  | 11,974 |
Total investment securities (losses) gains, net |  | $ | (4,093 | ) |  | $ | 2,623 |  |  | $ | 28,810 |  |  | $ | 10,127 |
Available-for-sale Securities [Member] |
Contractual Maturity Information | The following table presents contractual maturity information for securities available for sale at September 30, 2025 (in thousands):
|  | Amortized |  |  | Fair |
|  | Cost |  |  | Value |
Due in 1 year or less |  | $ | 565,899 |  |  | $ | 564,700 |
Due after 1 year through 5 years |  |  | 2,535,587 |  |  |  | 2,545,738 |
Due after 5 years through 10 years |  |  | 624,238 |  |  |  | 616,146 |
Due after 10 years |  |  | 1,860,597 |  |  |  | 1,809,421 |
Total |  |  | 5,586,321 |  |  |  | 5,536,005 |
Mortgage-backed securities |  |  | 8,160,828 |  |  |  | 7,842,275 |
Total securities available for sale |  | $ | 13,747,149 |  |  | $ | 13,378,280 |
Held-to-maturity Securities [Member] |
Contractual Maturity Information | The following table provides detailed information about securities held to maturity at September 30, 2025 and December 31, 2024, respectively (in thousands):
September 30, 2025 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Allowance for Credit Losses |  |  | Net Carrying Amount |
U.S. Treasury |  | $ | 38,249 |  |  | $ | 4 |  |  | $ | (115 | ) |  | $ | 38,138 |  |  | $ | — |  |  | $ | 38,249 |
U.S. Agencies |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Mortgage-backed |  |  | 2,573,708 |  |  |  | 170 |  |  |  | (323,324 | ) |  |  | 2,250,554 |  |  |  | — |  |  |  | 2,573,708 |
State and political subdivisions |  |  | 3,042,275 |  |  |  | 13,072 |  |  |  | (224,338 | ) |  |  | 2,831,009 |  |  |  | (1,845 | ) |  |  | 3,040,430 |
Total |  | $ | 5,654,232 |  |  | $ | 13,246 |  |  | $ | (547,777 | ) |  | $ | 5,119,701 |  |  | $ | (1,845 | ) |  | $ | 5,652,387 |
December 31, 2024 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Allowance for Credit Losses |  |  | Net Carrying Amount |
U.S. Agencies |  | $ | 116,331 |  |  | $ | — |  |  | $ | (581 | ) |  | $ | 115,750 |  |  | $ | — |  |  | $ | 116,331 |
Mortgage-backed |  |  | 2,523,134 |  |  |  | — |  |  |  | (418,482 | ) |  |  | 2,104,652 |  |  |  | — |  |  |  | 2,523,134 |
State and political subdivisions |  |  | 2,739,447 |  |  |  | 12,035 |  |  |  | (222,946 | ) |  |  | 2,528,536 |  |  |  | (2,645 | ) |  |  | 2,736,802 |
Total |  | $ | 5,378,912 |  |  | $ | 12,035 |  |  | $ | (642,009 | ) |  | $ | 4,748,938 |  |  | $ | (2,645 | ) |  | $ | 5,376,267 |
The following table presents contractual maturity information for securities held to maturity at September 30, 2025 (in thousands):
|  | Amortized |  |  | Fair |
|  | Cost |  |  | Value |
Due in 1 year or less |  | $ | 157,934 |  |  | $ | 157,342 |
Due after 1 year through 5 years |  |  | 378,358 |  |  |  | 368,805 |
Due after 5 years through 10 years |  |  | 875,003 |  |  |  | 836,790 |
Due after 10 years |  |  | 1,669,229 |  |  |  | 1,506,210 |
Total |  |  | 3,080,524 |  |  |  | 2,869,147 |
Mortgage-backed securities |  |  | 2,573,708 |  |  |  | 2,250,554 |
Total securities held to maturity |  | $ | 5,654,232 |  |  | $ | 5,119,701 |

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