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Securities (Tables) | 9 Months Ended
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Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract] |
Amortized cost and estimated fair value of investment and mortgage-backed securities | The amortized cost, gross unrealized gains and losses and estimated fair value of investment and mortgage-backed AFS and HTM securities as of September 30, 2024 and December 31, 2023 are reflected in the tables below (in thousands):
|  | September 30, 2024
|  | Amortized |  | Gross Unrealized |  | Gross Unrealized |  |  |  | Estimated
AVAILABLE FOR SALE |  | Cost |  | Gains |  | Losses |  |  |  | Fair Value
Investment securities: |  |  |  |  |  |  |  |  |  |
U.S. Treasury |  | $ | 174,076 |  |  | $ | 91 |  |  | $ | — |  |  |  |  | $ | 174,167 |
State and political subdivisions |  | 468,836 |  |  | 135 |  |  | 32,044 |  |  |  |  | 436,927 |
Corporate bonds and other |  | 14,626 |  |  | 147 |  |  | 414 |  |  |  |  | 14,359 |
MBS: (1) |  |  |  |  |  |  |  |  |  |
Residential |  | 770,310 |  |  | 10,016 |  |  | 2,233 |  |  |  |  | 778,093 |
Commercial |  | 5,249 |  |  | 81 |  |  | 439 |  |  |  |  | 4,891 |
Total |  | $ | 1,433,097 |  |  | $ | 10,470 |  |  | $ | 35,130 |  |  |  |  | $ | 1,408,437 |
HELD TO MATURITY |  |  |  |  |  |  |  |  |  |
Investment securities: |  |  |  |  |  |  |  |  |  |
State and political subdivisions |  | $ | 1,040,876 |  |  | $ | 8,810 |  |  | $ | 110,543 |  |  |  |  | $ | 939,143 |
Corporate bonds and other |  | 131,456 |  |  | 157 |  |  | 10,387 |  |  |  |  | 121,226 |
MBS: (1) |  |  |  |  |  |  |  |  |  |
Residential |  | 86,321 |  |  | 19 |  |  | 5,493 |  |  |  |  | 80,847 |
Commercial |  | 29,750 |  |  | — |  |  | 1,443 |  |  |  |  | 28,307 |
Total |  | $ | 1,288,403 |  |  | $ | 8,986 |  |  | $ | 127,866 |  |  |  |  | $ | 1,169,523 |
|  | December 31, 2023 |  |
|  | Amortized |  | Gross Unrealized |  | Gross Unrealized |  | Estimated |  |
AVAILABLE FOR SALE |  | Cost |  | Gains |  | Losses |  | Fair Value |  |
Investment securities: |  |  |  |  |  |  |  |  |  |
U.S. Treasury |  | $ | 139,706 |  |  | $ | 19 |  |  | $ | — |  |  | $ | 139,725 |  |  |
State and political subdivisions |  | 603,913 |  |  | 362 |  |  | 35,530 |  |  | 568,745 |  |  |
Corporate bonds and other |  | 14,569 |  |  | 31 |  |  | 507 |  |  | 14,093 |  |  |
MBS: (1) |  |  |  |  |  |  |  |  |  |
Residential |  | 569,039 |  |  | 3,202 |  |  | 3,258 |  |  | 568,983 |  |  |
Commercial |  | 5,240 |  |  | 44 |  |  | 536 |  |  | 4,748 |  |  |
Total |  | $ | 1,332,467 |  |  | $ | 3,658 |  |  | $ | 39,831 |  |  | $ | 1,296,294 |  |  |
HELD TO MATURITY |  |  |  |  |  |  |  |  |  |
Investment securities: |  |  |  |  |  |  |  |  |  |
State and political subdivisions |  | $ | 1,039,440 |  |  | $ | 10,070 |  |  | $ | 126,233 |  |  | $ | 923,277 |  |  |
Corporate bonds and other |  | 146,712 |  |  | 488 |  |  | 15,738 |  |  | 131,462 |  |  |
MBS: (1) |  |  |  |  |  |  |  |  |  |
Residential |  | 90,619 |  |  | 13 |  |  | 7,263 |  |  | 83,369 |  |  |
Commercial |  | 30,282 |  |  | — |  |  | 2,228 |  |  | 28,054 |  |  |
Total |  | $ | 1,307,053 |  |  | $ | 10,571 |  |  | $ | 151,462 |  |  | $ | 1,166,162 |  |  |
(1) All MBS are issued and/or guaranteed by U.S. government agencies or U.S. GSEs.
Schedule of Unrealized Loss on Investments | The following tables present the fair value and unrealized losses on AFS and HTM investment securities and MBS, if applicable, for which an allowance for credit losses has not been recorded as of September 30, 2024 and December 31, 2023, segregated by major security type and length of time in a continuous loss position (in thousands):
| September 30, 2024
| Less Than 12 Months |  | More Than 12 Months |  | Total
| Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss
AVAILABLE FOR SALE |  |  |  |  |  |  |  |  |  |  |
Investment securities: |  |  |  |  |  |  |  |  |  |  |
State and political subdivisions | $ | — |  |  | $ | — |  |  | $ | 414,965 |  |  | $ | 32,044 |  |  | $ | 414,965 |  |  | $ | 32,044 |
Corporate bonds and other | 2,926 |  |  | 74 |  |  | 6,377 |  |  | 340 |  |  | 9,303 |  |  | 414 |
MBS: |  |  |  |  |  |  |  |  |  |  |
Residential | 19,843 |  |  | 63 |  |  | 34,116 |  |  | 2,170 |  |  | 53,959 |  |  | 2,233 |
Commercial | — |  |  | — |  |  | 2,552 |  |  | 439 |  |  | 2,552 |  |  | 439 |
Total | $ | 22,769 |  |  | $ | 137 |  |  | $ | 458,010 |  |  | $ | 34,993 |  |  | $ | 480,779 |  |  | $ | 35,130 |
HELD TO MATURITY |  |  |  |  |  |  |  |  |  |  |
Investment securities: |  |  |  |  |  |  |  |  |  |  |
State and political subdivisions | $ | 22,229 |  |  | $ | 224 |  |  | $ | 737,971 |  |  | $ | 110,319 |  |  | $ | 760,200 |  |  | $ | 110,543 |
Corporate bonds and other | 6,137 |  |  | 143 |  |  | 107,409 |  |  | 10,244 |  |  | 113,546 |  |  | 10,387 |
MBS: |  |  |  |  |  |  |  |  |  |  |
Residential | — |  |  | — |  |  | 80,287 |  |  | 5,493 |  |  | 80,287 |  |  | 5,493 |
Commercial | — |  |  | — |  |  | 28,307 |  |  | 1,443 |  |  | 28,307 |  |  | 1,443 |
Total | $ | 28,366 |  |  | $ | 367 |  |  | $ | 953,974 |  |  | $ | 127,499 |  |  | $ | 982,340 |  |  | $ | 127,866 |
| December 31, 2023
| Less Than 12 Months |  | More Than 12 Months |  | Total
| Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss
AVAILABLE FOR SALE |  |  |  |  |  |  |  |  |  |  |
Investment securities: |  |  |  |  |  |  |  |  |  |  |
State and political subdivisions | $ | 26,371 |  |  | $ | 297 |  |  | $ | 516,520 |  |  | $ | 35,233 |  |  | $ | 542,891 |  |  | $ | 35,530 |
Corporate bonds and other | 8,103 |  |  | 319 |  |  | 5,071 |  |  | 188 |  |  | 13,174 |  |  | 507 |
MBS: |  |  |  |  |  |  |  |  |  |  |
Residential | 150,865 |  |  | 549 |  |  | 36,864 |  |  | 2,709 |  |  | 187,729 |  |  | 3,258 |
Commercial | — |  |  | — |  |  | 2,484 |  |  | 536 |  |  | 2,484 |  |  | 536 |
Total | $ | 185,339 |  |  | $ | 1,165 |  |  | $ | 560,939 |  |  | $ | 38,666 |  |  | $ | 746,278 |  |  | $ | 39,831 |
HELD TO MATURITY |  |  |  |  |  |  |  |  |  |  |
Investment securities: |  |  |  |  |  |  |  |  |  |  |
State and political subdivisions | $ | 16,549 |  |  | $ | 123 |  |  | $ | 713,499 |  |  | $ | 126,110 |  |  | $ | 730,048 |  |  | $ | 126,233 |
Corporate bonds and other | 9,956 |  |  | 1,135 |  |  | 114,787 |  |  | 14,603 |  |  | 124,743 |  |  | 15,738 |
MBS: |  |  |  |  |  |  |  |  |  |  |
Residential | — |  |  | — |  |  | 82,747 |  |  | 7,263 |  |  | 82,747 |  |  | 7,263 |
Commercial | — |  |  | — |  |  | 28,054 |  |  | 2,228 |  |  | 28,054 |  |  | 2,228 |
Total | $ | 26,505 |  |  | $ | 1,258 |  |  | $ | 939,087 |  |  | $ | 150,204 |  |  | $ | 965,592 |  |  | $ | 151,462 |
Interest income recognized on securities | The following table reflects interest income recognized on securities for the periods presented (in thousands):
| Three Months Ended September 30, |  |
| 2024 |  | 2023 |  |
U.S. Treasury | $ | 2,315 |  |  | $ | 3,784 |  |  |
State and political subdivisions | 12,994 |  |  | 16,940 |  |  |
Corporate bonds and other | 1,654 |  |  | 1,765 |  |  |
MBS | 11,976 |  |  | 4,426 |  |  |
Total interest income on securities | $ | 28,939 |  |  | $ | 26,915 |  |  |
| Nine Months Ended September 30,
| 2024 |  | 2023
U.S. Treasury | $ | 6,404 |  |  | $ | 8,307 |
State and political subdivisions | 41,151 |  |  | 50,940 |
Corporate bonds and other | 5,182 |  |  | 5,363 |
MBS | 33,179 |  |  | 12,585 |
Total interest income on securities | $ | 85,916 |  |  | $ | 77,195 |
Amortized cost, carrying value and fair value of securities presented by contractual maturity | The amortized cost and estimated fair value of AFS and HTM securities at September 30, 2024, are presented below by contractual maturity (in thousands):
| September 30, 2024
| Amortized Cost |  | Fair Value
AVAILABLE FOR SALE |
Investment securities: |  |  |
Due in one year or less | $ | 176,356 |  |  | $ | 176,436 |
Due after one year through five years | 1,797 |  |  | 1,810 |
Due after five years through ten years | 25,600 |  |  | 25,193 |
Due after ten years | 453,785 |  |  | 422,014 |
| 657,538 |  |  | 625,453 |
MBS: | 775,559 |  |  | 782,984 |
Total | $ | 1,433,097 |  |  | $ | 1,408,437 |
| September 30, 2024
| Amortized Cost |  | Fair Value
HELD TO MATURITY |
Investment securities: |  |  |
Due in one year or less | $ | 4,118 |  |  | $ | 4,087 |
Due after one year through five years | 11,920 |  |  | 11,695 |
Due after five years through ten years | 141,206 |  |  | 131,105 |
Due after ten years | 1,015,088 |  |  | 913,482 |
| 1,172,332 |  |  | 1,060,369 |
MBS: | 116,071 |  |  | 109,154 |
Total | $ | 1,288,403 |  |  | $ | 1,169,523 |
Unrealized and realized gains (losses) recognized in net income on equity investments | The following is a summary of unrealized and realized gains and losses on equity investments recognized in other noninterest income in the consolidated statements of income during the periods presented (in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2024 |  | 2023 |  | 2024 |  | 2023
Net gains (losses) recognized during the period on equity investments | $ | 191 |  |  | $ | (163) |  |  | $ | 112 |  |  | $ | 4,895 |
Less: Net gains recognized during the period on equity investments sold during the period | — |  |  | — |  |  | — |  |  | 5,058 |
Unrealized gains (losses) recognized during the reporting period on equity investments held at the reporting date | $ | 191 |  |  | $ | (163) |  |  | $ | 112 |  |  | $ | (163) |

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