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EMPLOYEE BENEFITS (Tables)

12 Months Ended

Dec. 31, 2024

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,
						2024																		2023																		2022
						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						$	73,165					$	2,246					$	16,176					$	69,869					$	2,379					$	15,463					$	94,170					$	3,483					$	19,321
Interest cost						3,620						105						859						3,771						126						831						2,741						102						578
Actuarial (gain) loss						(4,182)						(220)						666						3,856						201						555						(22,997)						(1,076)						(3,763)
Benefits paid						(4,296)						(74)						(853)						(4,218)						(61)						(673)						(3,950)						(60)						(673)
Expenses paid						—						—						—						(113)						(88)						—						(95)						(70)						—
Settlements						—						—						—						—						(311)						—						—						—						—
Benefit obligation at end of year						68,307						2,057						16,848						73,165						2,246						16,176						69,869						2,379						15,463
Change in Plan Assets:
Fair value of plan assets at end of prior year						81,551						3,085						—						76,735						3,128						—						97,439						3,871						—
Actual return						233						141						—						9,147						417						—						(16,659)						(613)						—
Employer contributions						—						—						853						—						—						673						—						—						673
Benefits paid						(4,296)						(74)						(853)						(4,218)						(61)						(673)						(3,950)						(60)						(673)
Expenses paid						—						—						—						(113)						(88)						—						(95)						(70)						—
Settlements						—						—						—						—						(311)						—						—						—						—
Fair value of plan assets at end of year						77,488						3,152						—						81,551						3,085						—						76,735						3,128						—
(Un)Funded status at end of year						9,181						1,095						(16,848)						8,386						839						(16,176)						6,866						749						(15,463)
Accrued benefit (liability) asset recognized						$	9,181					$	1,095					$	(16,848)					$	8,386					$	839					$	(16,176)					$	6,866					$	749					$	(15,463)
Accumulated benefit obligation at end of year						$	68,307					$	2,057					$	16,848					$	73,165					$	2,246					$	16,176					$	69,869					$	2,379					$	15,463

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,
						2024																		2023																		2022
						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						$	578					$	—					$	51					$	726					$	—					$	30					$	640					$	—					$	255
Recognition of gain due to settlement						—						—						—						—						(16)						—						—						—						—
Net gain (loss) occurring during the year						(442)						180						(666)						718						29						(555)						493						231						3,763
						136						180						(615)						1,444						13						(525)						1,133						231						4,018
Deferred tax (expense) benefit						(29)						(37)						129						(303)						(3)						110						(238)						(48)						(844)
Other comprehensive income (loss), net of tax						$	107					$	143					$	(486)					$	1,141					$	10					$	(415)					$	895					$	183					$	3,174

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, 2024																		December 31, 2023
						Retirement Plan						Acquired Retirement Plan						Restoration Plan						Retirement Plan						Acquired Retirement Plan						Restoration Plan
Net loss						$	578					$	—					$	51					$	726					$	—					$	30
Deferred tax expense						(121)						—						(11)						(153)						—						(6)
Accumulated other comprehensive income (loss), net of tax						$	457					$	—					$	40					$	573					$	—					$	24

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, 2024																		December 31, 2023
						Retirement Plan						Acquired Retirement Plan						Restoration Plan						Retirement Plan						Acquired Retirement Plan						Restoration Plan
Net gain (loss)						$	(21,220)					$	293					$	(3,126)					$	(21,356)					$	113					$	(2,511)
Deferred tax (expense) benefit						4,456						(61)						656						4,485						(24)						527
Accumulated other comprehensive income (loss), net of tax						$	(16,764)					$	232					$	(2,470)					$	(16,871)					$	89					$	(1,984)

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,
						2024						2023						2022
Retirement Plan:
Interest cost						$	3,620					$	3,771					$	2,741
Expected return on assets						(4,857)						(4,573)						(5,845)
Net loss amortization						578						726						640
Net periodic benefit cost (income)						$	(659)					$	(76)					$	(2,464)
Acquired Retirement Plan:
Interest cost						$	105					$	126					$	102
Expected return on assets						(180)						(187)						(232)
Gain recognized due to settlement						—						(16)						—
Net periodic benefit cost (income)						$	(75)					$	(77)					$	(130)
Restoration Plan:
Interest cost						$	859					$	831					$	578
Net loss amortization						51						30						255
Net periodic benefit cost						$	910					$	861					$	833

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, 2024																		December 31, 2023
						Retirement Plan						Acquired Retirement Plan						Restoration Plan						Retirement Plan						Acquired Retirement Plan						Restoration Plan
Discount rate						5.58		%				5.71		%				5.47		%				5.13		%				5.13		%				5.13		%

The assumptions used to determine net periodic pension cost and postretirement benefit cost were as follows:

						Years Ended December 31,
						2024						2023						2022
Retirement Plan:
Discount rate						5.13		%				5.46		%				2.95		%
Expected long-term rate of return on plan assets						6.13		%				6.13		%				6.13		%
Acquired Retirement Plan:
Discount rate						5.13		%				5.46		%				2.95		%
Expected long-term rate of return on plan assets						6.13		%				6.13		%				6.13		%
Restoration Plan:
Discount rate						5.13		%				5.46		%				2.95		%

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, 2024												December 31, 2023
						Retirement Plan						Acquired Retirement Plan						Retirement Plan						Acquired Retirement Plan
Level 1:
Cash						$	—					$	—					$	1,428					$	—
Equity securities:
U.S. large cap (1)						—						706						28,506						1,055
U.S. mid cap (2)						—						37						4,323						125
U.S. small cap (3)						—						13						11,907						64
International developed (4)						—						—						9,317						—
International emerging (2)						—						—						1,964						—
International (5)						—						295						—						540
Fixed income securities:
Corporate bonds (6)						—						2,030						—						1,078
U.S. government treasuries (6)						—						—						148						—
Real estate (7)						—						71						—						223
Level 2:
Cash equivalents						1,598						—						5,957						—
Equity securities:
U.S. large cap (8)						4,010						—						—						—
U.S. mid cap (8)						977						—						—						—
U.S. small cap (8)						557						—						—						—
International (8)						1,532						—						—						—
Fixed income securities:
Corporate bonds (6)						—						—						1,893						—
Collective investment funds (9)						68,814						—						—						—
U.S. government agencies (6)						—						—						4,871						—
Municipal bonds (6)						—						—						11,119						—
U.S. agency MBS (10)						—						—						118						—
Total fair value of plan assets						$	77,488					$	3,152					$	81,551					$	3,085

(1)For the Retirement Plan, this category was comprised of broadly diversified “passive” and “active” mutual funds. The Acquired Retirement Plan assets in this category consist of pooled separate accounts invested mainly in domestic stocks.

(2)For the Retirement Plan, this category was comprised of broadly diversified “active” mutual funds. The Acquired Retirement Plan assets in this category consist of pooled separate accounts invested mainly in mutual funds and domestic stocks.

(3)For the Retirement Plan, this category was 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 and domestic stocks.

(4)This category was 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 was comprised of individual investment grade securities that are generally HTM, as well as broadly diversified “active” mutual funds bonds and fixed income securities. 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 collective investment funds invested in mutual funds.

(9)Funds invest principally in investment grade debt securities, including U.S. Government obligations, corporate bonds and mortgage and asset backed securities.

(10)This category was 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, 2024, 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
2025			$	4,620					$	180					$	980
2026			4,990						120						1,510
2027			5,040						110						1,480
2028			5,110						350						1,510
2029			5,140						70						1,490
2030 through 2034			25,350						650						7,190
			$	50,250					$	1,480					$	14,160

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,
			2024						2023						2022
New shares issued from available treasury shares			149,060						99,109						86,500
Proceeds from stock option exercises			$	2,624					$	1,082					$	790
Intrinsic value of stock options exercised			$	480					$	229					$	421

Schedule of stock options and restricted stock units award activity

A combined summary of activity in our share-based plans as of December 31, 2024 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, 2024						197,943						$	34.76					28,654						$	40.18					620,506						$	33.76					$	6.47
Granted						147,076						27.26						27,800						30.75						—						—						—
Stock options exercised						—						—						—						—						(91,067)						28.83						5.92
Stock awards vested						(69,340)						35.50						—						—						—						—						—
Forfeited						(23,651)						34.59						(5,085)						34.29						—						—						—
Canceled/expired						—						—						—						—						(8,826)						34.83						6.33
Balance, December 31, 2024						252,028						$	30.18					51,369						$	35.69					520,613						$	34.61					$	6.57

Schedule of shares stock option exercise price range

Other information regarding options outstanding and exercisable as of December 31, 2024 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
$	26.49		-			$	30.00					28,921						$	26.68					0.54						28,921						$	26.68
30.01			-			35.00						416,351						34.67						3.79						416,351						34.67
35.01			-			37.28						75,341						37.28						1.75						75,341						37.28
Total												520,613						$	34.61					3.31						520,613						$	34.61

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