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EMPLOYEE BENEFITS (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2023
Employee Benefits Including Defined Benefit Plans and Share-based Compensation Plans [Abstract] |
Schedule of changes in projected benefit obligation and fair value of plan assets | Activity in our defined benefit pension plans and restoration plan were as follows (in thousands):
|  | Years Ended December 31,
|  | 2023 |  | 2022 |  | 2021
|  | Retirement Plan |  | Acquired Retirement Plan |  | Restoration Plan |  | Retirement Plan |  | Acquired Retirement Plan |  | Restoration Plan |  | Retirement Plan |  | Acquired Retirement Plan |  | Restoration Plan
|  | (in thousands)
Change in Projected Benefit Obligation: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Benefit obligation at end of prior year |  | $ | 69,869 |  |  | $ | 2,379 |  |  | $ | 15,463 |  |  | $ | 94,170 |  |  | $ | 3,483 |  |  | $ | 19,321 |  |  | $ | 96,848 |  |  | $ | 3,704 |  |  | $ | 18,789 |
Interest cost |  | 3,771 |  |  | 126 |  |  | 831 |  |  | 2,741 |  |  | 102 |  |  | 578 |  |  | 2,570 |  |  | 92 |  |  | 520 |
Actuarial (gain) loss |  | 3,856 |  |  | 201 |  |  | 555 |  |  | (22,997) |  |  | (1,076) |  |  | (3,763) |  |  | (1,381) |  |  | (155) |  |  | 684 |
Benefits paid |  | (4,218) |  |  | (61) |  |  | (673) |  |  | (3,950) |  |  | (60) |  |  | (673) |  |  | (3,734) |  |  | (59) |  |  | (672) |
Expenses paid |  | (113) |  |  | (88) |  |  | — |  |  | (95) |  |  | (70) |  |  | — |  |  | (133) |  |  | (99) |  |  | — |
Settlements |  | — |  |  | (311) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Benefit obligation at end of year |  | 73,165 |  |  | 2,246 |  |  | 16,176 |  |  | 69,869 |  |  | 2,379 |  |  | 15,463 |  |  | 94,170 |  |  | 3,483 |  |  | 19,321 |
Change in Plan Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets at end of prior year |  | 76,735 |  |  | 3,128 |  |  | — |  |  | 97,439 |  |  | 3,871 |  |  | — |  |  | 90,419 |  |  | 3,613 |  |  | — |
Actual return |  | 9,147 |  |  | 417 |  |  | — |  |  | (16,659) |  |  | (613) |  |  | — |  |  | 10,887 |  |  | 416 |  |  | — |
Employer contributions |  | — |  |  | — |  |  | 673 |  |  | — |  |  | — |  |  | 673 |  |  | — |  |  | — |  |  | 672 |
Benefits paid |  | (4,218) |  |  | (61) |  |  | (673) |  |  | (3,950) |  |  | (60) |  |  | (673) |  |  | (3,734) |  |  | (59) |  |  | (672) |
Expenses paid |  | (113) |  |  | (88) |  |  | — |  |  | (95) |  |  | (70) |  |  | — |  |  | (133) |  |  | (99) |  |  | — |
Settlements |  | — |  |  | (311) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Fair value of plan assets at end of year |  | 81,551 |  |  | 3,085 |  |  | — |  |  | 76,735 |  |  | 3,128 |  |  | — |  |  | 97,439 |  |  | 3,871 |  |  | — |
(Un)Funded status at end of year |  | 8,386 |  |  | 839 |  |  | (16,176) |  |  | 6,866 |  |  | 749 |  |  | (15,463) |  |  | 3,269 |  |  | 388 |  |  | (19,321) |
Accrued benefit (liability) asset recognized |  | $ | 8,386 |  |  | $ | 839 |  |  | $ | (16,176) |  |  | $ | 6,866 |  |  | $ | 749 |  |  | $ | (15,463) |  |  | $ | 3,269 |  |  | $ | 388 |  |  | $ | (19,321) |
Accumulated benefit obligation at end of year |  | $ | 73,165 |  |  | $ | 2,246 |  |  | $ | 16,176 |  |  | $ | 69,869 |  |  | $ | 2,379 |  |  | $ | 15,463 |  |  | $ | 94,170 |  |  | $ | 3,483 |  |  | $ | 19,321 |
Schedule of amounts recognized in other comprehensive income (loss) | Amounts related to our defined benefit pension plans and restoration plan recognized as a component of other comprehensive income (loss) were as follows (in thousands):
|  | Years Ended December 31,
|  | 2023 |  | 2022 |  | 2021
|  | Retirement Plan |  | Acquired Retirement Plan |  | Restoration Plan |  | Retirement Plan |  | Acquired Retirement Plan |  | Restoration Plan |  | Retirement Plan |  | Acquired Retirement Plan |  | Restoration Plan
Recognition of net loss |  | $ | 726 |  |  | $ | — |  |  | $ | 30 |  |  | $ | 640 |  |  | $ | — |  |  | $ | 255 |  |  | $ | 1,002 |  |  | $ | 6 |  |  | $ | 256 |
Recognition of gain due to settlement |  | — |  |  | (16) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Net gain (loss) occurring during the year |  | 718 |  |  | 29 |  |  | (555) |  |  | 493 |  |  | 231 |  |  | 3,763 |  |  | 6,848 |  |  | 361 |  |  | (685) |
|  | 1,444 |  |  | 13 |  |  | (525) |  |  | 1,133 |  |  | 231 |  |  | 4,018 |  |  | 7,850 |  |  | 367 |  |  | (429) |
Deferred tax (expense) benefit |  | (303) |  |  | (3) |  |  | 110 |  |  | (238) |  |  | (48) |  |  | (844) |  |  | (1,648) |  |  | (77) |  |  | 90 |
Other comprehensive income (loss), net of tax |  | $ | 1,141 |  |  | $ | 10 |  |  | $ | (415) |  |  | $ | 895 |  |  | $ | 183 |  |  | $ | 3,174 |  |  | $ | 6,202 |  |  | $ | 290 |  |  | $ | (339) |
Schedule of amounts in accumulated other comprehensive income (loss) recognized in net periodic benefit cost during period | Net amounts recognized in net periodic benefit cost and other comprehensive income (loss) were as follows (in thousands):
|  | December 31, 2023 |  | December 31, 2022
|  | Retirement Plan |  | Acquired Retirement Plan |  | Restoration Plan |  | Retirement Plan |  | Acquired Retirement Plan |  | Restoration Plan
Net loss |  | $ | 726 |  |  | $ | — |  |  | $ | 30 |  |  | $ | 640 |  |  | $ | — |  |  | $ | 255 |
Deferred tax expense |  | (153) |  |  | — |  |  | (6) |  |  | (134) |  |  | — |  |  | (54) |
Accumulated other comprehensive income (loss), net of tax |  | $ | 573 |  |  | $ | — |  |  | $ | 24 |  |  | $ | 506 |  |  | $ | — |  |  | $ | 201 |
Schedule of amounts recognized as a component of accumulated other comprehensive loss | Amounts recognized as a component of accumulated other comprehensive income (loss) were as follows (in thousands):
|  | December 31, 2023 |  | December 31, 2022
|  | Retirement Plan |  | Acquired Retirement Plan |  | Restoration Plan |  | Retirement Plan |  | Acquired Retirement Plan |  | Restoration Plan
Net gain (loss) |  | $ | (21,356) |  |  | $ | 113 |  |  | $ | (2,511) |  |  | $ | (22,800) |  |  | $ | 100 |  |  | $ | (1,986) |
Deferred tax (expense) benefit |  | 4,485 |  |  | (24) |  |  | 527 |  |  | 4,788 |  |  | (21) |  |  | 417 |
Accumulated other comprehensive income (loss), net of tax |  | $ | (16,871) |  |  | $ | 89 |  |  | $ | (1,984) |  |  | $ | (18,012) |  |  | $ | 79 |  |  | $ | (1,569) |
Schedule of components of net periodic pension cost and postretirement benefit cost | Net periodic pension cost and postretirement benefit cost included the following components (in thousands):
|  | Years Ended December 31,
|  | 2023 |  | 2022 |  | 2021
Retirement Plan: |  |
Interest cost |  | $ | 3,771 |  |  | $ | 2,741 |  |  | $ | 2,570 |
Expected return on assets |  | (4,573) |  |  | (5,845) |  |  | (5,420) |
Net loss amortization |  | 726 |  |  | 640 |  |  | 1,002 |
Net periodic benefit cost (income) |  | $ | (76) |  |  | $ | (2,464) |  |  | $ | (1,848) |
Acquired Retirement Plan: |  |  |  |  |  |
Interest cost |  | $ | 126 |  |  | $ | 102 |  |  | $ | 92 |
Expected return on assets |  | (187) |  |  | (232) |  |  | (211) |
Net loss amortization |  | — |  |  | — |  |  | 6 |
Gain recognized due to settlement |  | (16) |  |  | — |  |  | — |
Net periodic benefit cost (income) |  | $ | (77) |  |  | $ | (130) |  |  | $ | (113) |
Restoration Plan: |  |  |  |  |  |
Interest cost |  | $ | 831 |  |  | $ | 578 |  |  | $ | 520 |
Net loss amortization |  | 30 |  |  | 255 |  |  | 256 |
Net periodic benefit cost |  | $ | 861 |  |  | $ | 833 |  |  | $ | 776 |
Schedule of assumptions used to determine benefit obligation and net periodic benefit cost | The assumptions used to determine the benefit obligation were as follows:
|  | December 31, 2023 |  | December 31, 2022
|  | Retirement Plan |  | Acquired Retirement Plan |  | Restoration Plan |  | Retirement Plan |  | Acquired Retirement Plan |  | Restoration Plan
Discount rate |  | 5.13 | % |  | 5.13 | % |  | 5.13 | % |  | 5.46 | % |  | 5.46 | % |  | 5.46 | %
The assumptions used to determine net periodic pension cost and postretirement benefit cost were as follows:
|  | Years Ended December 31,
|  | 2023 |  | 2022 |  | 2021
Retirement Plan: |  |  |  |  |  |
Discount rate |  | 5.46 | % |  | 2.95 | % |  | 2.65 | %
Expected long-term rate of return on plan assets |  | 6.13 | % |  | 6.13 | % |  | 6.13 | %
Acquired Retirement Plan: |  |  |  |  |  |
Discount rate |  | 5.46 | % |  | 2.95 | % |  | 2.65 | %
Expected long-term rate of return on plan assets |  | 6.13 | % |  | 6.13 | % |  | 6.13 | %
Restoration Plan: |  |  |  |  |  |
Discount rate |  | 5.46 | % |  | 2.95 | % |  | 2.65 | %
Schedule of allocation of plan assets | The major categories of assets in the Plan and the Acquired Retirement Plan are presented in the following table (in thousands). Assets are segregated by the level of the valuation inputs within the fair value hierarchy established by ASC Topic 820 “Fair Value Measurements and Disclosures,” utilized to measure fair value (see “Note 12 – Fair Value Measurement”). Our Restoration Plan is unfunded.
|  | December 31, 2023 |  | December 31, 2022
|  | Retirement Plan |  | Acquired Retirement Plan |  | Retirement Plan |  | Acquired Retirement Plan
Level 1: |  |
Cash |  | $ | 1,428 |  |  | $ | — |  |  | $ | 605 |  |  | $ | — |
Equity securities: |  |  |  |  |  |  |  |
U.S. large cap (1) |  | 28,506 |  |  | 1,055 |  |  | 23,032 |  |  | 1,103 |
U.S. mid cap (2) |  | 4,323 |  |  | 125 |  |  | 3,594 |  |  | 135 |
U.S. small cap (3) |  | 11,907 |  |  | 64 |  |  | 12,447 |  |  | 66 |
International developed (4) |  | 9,317 |  |  | — |  |  | 8,161 |  |  | — |
International emerging (2) |  | 1,964 |  |  | — |  |  | 1,841 |  |  | — |
International (5) |  | — |  |  | 540 |  |  | — |  |  | 547 |
Fixed income securities: |  |  |  |  |  |  |  |
Corporate bonds (6) |  | — |  |  | 1,078 |  |  | — |  |  | 1,027 |
U.S. government treasuries (6) |  | 148 |  |  | — |  |  | 233 |  |  | — |
Real estate (7) |  | — |  |  | 223 |  |  | — |  |  | 250 |
Level 2: |  |  |  |  |  |  |  |
Cash Equivalents |  | 5,957 |  |  | — |  |  | 8,543 |  |  | — |
Fixed income securities: |  |  |  |  |  |  |  |
Corporate bonds (6) |  | 1,893 |  |  | — |  |  | 1,979 |  |  | — |
U.S. government agencies (6) |  | 4,871 |  |  | — |  |  | 4,380 |  |  | — |
Municipal bonds (6) |  | 11,119 |  |  | — |  |  | 11,774 |  |  | — |
U.S. agency MBS (8) |  | 118 |  |  | — |  |  | 146 |  |  | — |
Total fair value of plan assets |  | $ | 81,551 |  |  | $ | 3,085 |  |  | $ | 76,735 |  |  | $ | 3,128 |
(1)For the Retirement Plan, this category is comprised of broadly diversified “passive” and “active” mutual funds. The Acquired Retirement Plan assets in this category consist of pooled separate accounts invested in mutual funds and domestic stocks. (2)For the Retirement Plan, this category is comprised of broadly diversified “active” mutual funds. The Acquired Retirement Plan assets in this category consist of pooled separate accounts invested in mutual funds. (3)For the Retirement Plan, this category is comprised of broadly diversified “passive” and “active” mutual funds and shares of Southside Bancshares stock. The Acquired Retirement Plan assets in this category consist of pooled separate accounts invested in mutual funds. (4)This category is comprised of a broadly diversified “passive” and “active” mutual funds. (5)This category is comprised of pooled separate accounts invested in mutual funds and international stocks. (6)For the Retirement Plan, this category is comprised of individual investment grade securities that are generally HTM. The Acquired Retirement Plan assets in this category consist of pooled separate accounts invested in mutual funds, bonds and fixed income securities. (7)This category is comprised of a pooled separate account invested in commercial real estate and includes mortgage loans which are backed by the associated properties. (8)This category is comprised of individual securities that are generally not HTM.
Schedule of expected future benefit payments related to pension and postretirement plans | As of December 31, 2023, expected future benefit payments related to the Retirement Plan, the Acquired Retirement Plan and the Restoration Plan were as follows (in thousands):
| Retirement Plan |  | Acquired Retirement Plan |  | Restoration Plan
2024 | $ | 4,415 |  |  | $ | 85 |  |  | $ | 694 |
2025 | 4,616 |  |  | 92 |  |  | 818 |
2026 | 4,930 |  |  | 92 |  |  | 1,156 |
2027 | 5,115 |  |  | 128 |  |  | 1,406 |
2028 | 5,210 |  |  | 373 |  |  | 1,420 |
2029 through 2033 | 26,495 |  |  | 564 |  |  | 7,137 |
| $ | 50,781 |  |  | $ | 1,334 |  |  | $ | 12,631 |
Schedule of shares issued in connection with stock compensation awards along with other related information | Shares issued in connection with stock compensation awards along with other related information are presented in the following table (in thousands, except share amounts):
| Years Ended December 31,
| 2023 |  | 2022 |  | 2021
New shares issued from available treasury shares | 99,109 |  |  | 86,500 |  |  | 305,212 |
Proceeds from stock option exercises | $ | 1,082 |  |  | $ | 790 |  |  | $ | 7,672 |
Intrinsic value of stock options exercised | $ | 229 |  |  | $ | 421 |  |  | $ | 3,005 |
Schedule of stock options and restricted stock units award activity | A combined summary of activity in our share-based plans as of December 31, 2023 is presented below. Performance stock units outstanding are presented assuming attainment of the maximum payout rate as set forth by the performance criteria:
|  | Restricted Stock Units Outstanding |  | Stock Options Outstanding
|  | Service Based |  | Performance Based |  |  |  |  |  |
|  | Number of Shares |  | Weighted- Average Grant-Date Fair Value |  | Number of Shares |  | Weighted- Average Grant-Date Fair Value |  | Number of Shares |  | Weighted- Average Exercise Price |  | Weighted- Average Grant-Date Fair Value
Balance, January 1, 2023 |  | 225,928 |  |  | $ | 36.60 |  |  | 13,514 |  |  | $ | 41.74 |  |  | 673,011 |  |  | $ | 33.45 |  |  | $ | 6.49 |
Granted |  | 57,966 |  |  | 30.14 |  |  | 15,140 |  |  | 38.89 |  |  | — |  |  | — |  |  | — |
Stock options exercised |  | — |  |  | — |  |  | — |  |  | — |  |  | (38,556) |  |  | 28.03 |  |  | 6.77 |
Stock awards vested |  | (74,698) |  |  | 36.57 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Forfeited |  | (11,253) |  |  | 36.30 |  |  | — |  |  | — |  |  | (3,682) |  |  | 34.83 |  |  | 5.89 |
Canceled/expired |  | — |  |  | — |  |  | — |  |  | — |  |  | (10,267) |  |  | 34.12 |  |  | 6.37 |
Balance, December 31, 2023 |  | 197,943 |  |  | $ | 34.76 |  |  | 28,654 |  |  | $ | 40.18 |  |  | 620,506 |  |  | $ | 33.76 |  |  | $ | 6.47 |
Schedule of shares stock option exercise price range | Other information regarding options outstanding and exercisable as of December 31, 2023 is as follows:
|  | Options Outstanding |  | Options Exercisable
Range of Exercise Prices |  | Number of Shares |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Life in Years |  | Number of Shares |  | Weighted- Average Exercise Price
$ | 23.66 |  | - | $ | 25.00 |  |  | 6,153 |  |  | $ | 23.66 |  |  | 1.02 |  | 6,153 |  |  | $ | 23.66 |
25.01 |  | - | 30.00 |  |  | 86,226 |  |  | 26.61 |  |  | 1.48 |  | 86,226 |  |  | 26.61 |
30.01 |  | - | 35.00 |  |  | 451,962 |  |  | 34.67 |  |  | 5.06 |  | 451,962 |  |  | 34.67 |
35.01 |  | - | 37.28 |  |  | 76,165 |  |  | 37.28 |  |  | 2.87 |  | 76,165 |  |  | 37.28 |
Total |  | 620,506 |  |  | $ | 33.76 |  |  | 4.25 |  | 620,506 |  |  | $ | 33.76 |

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