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EMPLOYEE BENEFITS (Tables)

12 Months Ended

Dec. 31, 2022

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

						Years Ended December 31,
						2022																		2021																		2020
						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						$	94,170					$	3,483					$	19,321					$	96,848					$	3,704					$	18,789					$	100,012					$	4,870					$	19,098
Service cost						—						—						—						—						—						—						1,793						—						429
Interest cost						2,741						102						578						2,570						92						520						3,031						162						568
Actuarial (gain) loss						(22,997)						(1,076)						(3,763)						(1,381)						(155)						684						11,892						437						1,344
Benefits paid						(3,950)						(60)						(673)						(3,734)						(59)						(672)						(6,596)						(51)						(688)
Expenses paid						(95)						(70)						—						(133)						(99)						—						(202)						(113)						—
Curtailments						—						—						—						—						—						—						(13,082)						—						(1,962)
Settlements						—						—						—						—						—						—						—						(1,601)						—
Benefit obligation at end of year						69,869						2,379						15,463						94,170						3,483						19,321						96,848						3,704						18,789
Change in Plan Assets:
Fair value of plan assets at end of prior year						97,439						3,871						—						90,419						3,613						—						93,818						4,763						—
Actual return						(16,659)						(613)						—						10,887						416						—						3,399						615						—
Employer contributions						—						—						673						—						—						672						—						—						688
Benefits paid						(3,950)						(60)						(673)						(3,734)						(59)						(672)						(6,596)						(51)						(688)
Expenses paid						(95)						(70)						—						(133)						(99)						—						(202)						(113)						—
Settlements						—						—						—						—						—						—						—						(1,601)						—
Fair value of plan assets at end of year						76,735						3,128						—						97,439						3,871						—						90,419						3,613						—
(Un)Funded status at end of year						6,866						749						(15,463)						3,269						388						(19,321)						(6,429)						(91)						(18,789)
Accrued benefit (liability) asset recognized						$	6,866					$	749					$	(15,463)					$	3,269					$	388					$	(19,321)					$	(6,429)					$	(91)					$	(18,789)
Accumulated benefit obligation at end of year						$	69,869					$	2,379					$	15,463					$	94,170					$	3,483					$	19,321					$	96,848					$	3,704					$	18,789

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,
						2022																		2021																		2020
						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						$	640					$	—					$	255					$	1,002					$	6					$	256					$	2,474					$	10					$	551
Recognition of prior service (credit) cost						—						—						—						—						—						—						(14)						—						7
Recognition of loss due to settlement						—						—						—						—						—						—						—						215						—
Net gain (loss) occurring during the year						493						231						3,763						6,848						361						(685)						(1,086)						(124)						617
Net prior service cost occurring during the year						—						—						—						—						—						—						151						—						12
						1,133						231						4,018						7,850						367						(429)						1,525						101						1,187
Deferred tax (expense) benefit						(238)						(48)						(844)						(1,648)						(77)						90						(320)						(21)						(249)
Other comprehensive income (loss), net of tax						$	895					$	183					$	3,174					$	6,202					$	290					$	(339)					$	1,205					$	80					$	938

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, 2022																		December 31, 2021
						Retirement Plan						Acquired Retirement Plan						Restoration Plan						Retirement Plan						Acquired Retirement Plan						Restoration Plan
Net loss						$	640					$	—					$	255					$	1,002					$	6					$	256
Deferred tax expense						(134)						—						(54)						(211)						—						(54)
Accumulated other comprehensive income (loss), net of tax						$	506					$	—					$	201					$	791					$	6					$	202

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, 2022																		December 31, 2021
						Retirement Plan						Acquired Retirement Plan						Restoration Plan						Retirement Plan						Acquired Retirement Plan						Restoration Plan
Net gain (loss)						$	(22,800)					$	100					$	(1,986)					$	(23,933)					$	(131)					$	(6,004)
Deferred tax (expense) benefit						4,788						(21)						417						5,026						27						1,261
Accumulated other comprehensive income (loss), net of tax						$	(18,012)					$	79					$	(1,569)					$	(18,907)					$	(104)					$	(4,743)

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,
						2022						2021						2020
Retirement Plan:
Service cost						$	—					$	—					$	1,793
Interest cost						2,741						2,570						3,031
Expected return on assets						(5,845)						(5,420)						(5,676)
Net loss amortization						640						1,002						2,474
Prior service credit amortization						—						—						(14)
Loss due to curtailment						—						—						151
Net periodic benefit cost (income)						$	(2,464)					$	(1,848)					$	1,759
Acquired Retirement Plan:
Service cost						$	—					$	—					$	—
Interest cost						102						92						162
Expected return on assets						(232)						(211)						(301)
Net loss amortization						—						6						10
Prior service credit amortization						—						—						—
Loss recognized due to settlement						—						—						215
Net periodic benefit cost (income)						$	(130)					$	(113)					$	86
Restoration Plan:
Service cost						$	—					$	—					$	429
Interest cost						578						520						568
Net loss amortization						255						256						551
Prior service cost amortization						—						—						7
Loss due to curtailment						—						—						12
Net periodic benefit cost						$	833					$	776					$	1,567

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, 2022																		December 31, 2021
						Retirement Plan						Acquired Retirement Plan						Restoration Plan						Retirement Plan						Acquired Retirement Plan						Restoration Plan
Discount rate						5.46		%				5.46		%				5.46		%				2.95		%				2.95		%				2.95		%

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

						Years Ended December 31,
						2022						2021						2020
Retirement Plan:
Discount rate						2.95		%				2.65		%				2.78		%
Expected long-term rate of return on plan assets						6.13		%				6.13		%				6.50		%
Compensation increase rate						—						—						3.50		%
Acquired Retirement Plan:
Discount rate						2.95		%				2.65		%				3.41		%
Expected long-term rate of return on plan assets						6.13		%				6.13		%				6.50		%
Compensation increase rate						—						—						—
Restoration Plan:
Discount rate						2.95		%				2.65		%				2.78		%
Compensation increase rate						—						—						3.50		%

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, 2022												December 31, 2021
						Retirement Plan						Acquired Retirement Plan						Retirement Plan						Acquired Retirement Plan
Level 1:
Cash						$	605					$	—					$	3,495					$	—
Equity securities:
U.S. large cap (1)						23,032						1,103						27,692						1,351
U.S. mid cap (2)						3,594						135						7,556						151
U.S. small cap (3)						12,447						66						15,004						70
International developed (4)						8,161						—						9,768						—
International emerging (2)						1,841						—						2,322						—
International (5)						—						547						—						775
Fixed income securities:
Corporate bonds (6)						—						1,027						—						1,277
U.S. government treasuries (6)						233						—						262						—
Real estate (7)						—						250						—						247
Level 2:
Cash Equivalents						8,543						—						9,949						—
Fixed income securities:
Corporate bonds (6)						1,979						—						2,254						—
U.S. government agencies (6)						4,380						—						5,437						—
Municipal bonds (6)						11,774						—						13,508						—
U.S. agency MBS (8)						146						—						192						—
Total fair value of plan assets						$	76,735					$	3,128					$	97,439					$	3,871

(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, 2022, 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
2023			$	4,262					$	79					$	731
2024			4,459						84						749
2025			4,623						91						859
2026			4,883						91						1,161
2027			5,028						126						1,384
2028 through 2032			25,729						816						7,010
			$	48,984					$	1,287					$	11,894

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,
			2022						2021						2020
New shares issued from available treasury shares			86,500						305,212						116,661
Proceeds from stock option exercises			$	790					$	7,672					$	1,692
Intrinsic value of stock options exercised			$	421					$	3,005					$	881

Schedule of stock options and restricted stock units award activity

A combined summary of activity in our share-based plans as of December 31, 2022 is presented below:

						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, 2022						177,015						$	36.95					—						$	—					713,767						$	33.20					$	6.45
Granted						122,039						36.21						8,343						41.74						—						—						—
Stock options exercised						—						—						—						—						(33,486)						27.94						5.96
Stock awards vested						(65,092)						36.57						—						—						—						—						—
Forfeited						(7,368)						38.54						—						—						(7,270)						34.79						5.99
Canceled/expired						—						—						—						—						—						—						—
Balance, December 31, 2022						226,594						$	36.61					8,343						$	41.74					673,011						$	33.45					$	6.49

Schedule of shares stock option exercise price range

Other information regarding options outstanding and exercisable as of December 31, 2022 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
$	22.88		-			$	25.00					26,299						$	23.06					1.19						26,299						$	23.06
25.01			-			30.00						89,544						26.60						2.49						89,544						26.60
30.01			-			35.00						480,124						34.67						6.05						428,480						34.66
35.01			-			37.28						77,044						37.28						3.86						77,044						37.28
Total												673,011						$	33.45					5.13						621,367						$	33.33

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