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Pay vs Performance Disclosure

12 Months Ended

Dec. 31, 2022

USD ($)

Dec. 31, 2021

USD ($)

Dec. 31, 2020

USD ($)

Pay vs Performance Disclosure [Table]

Pay vs Performance [Table Text Block]

PAY VERSUS PERFORMANCE

The table below shows total compensation, as set forth in the summary compensation table, and compensation actually paid ("CAP"), calculated in accordance with SEC Pay versus Performance regulations for our PEO and other NEOs, as well as certain performance measures, for the fiscal years ended December 31, 2022, 2021 and 2020.


Year	Summary Compensation Table Total for PEO ($)(1)		Compensation actually paid to PEO ($)(2)		Average Summary Compensation Table Total for other NEOs ($)(3)		Average Compensation Actually Paid to other NEOs ($)(2)(3)		Value of Initial Fixed $100 Investment Based on:				Net Income ($ in Millions)		ROATCE %(6)
									TSR(4)		Peer Group TSR(5)
2022	$	1,549,596	$	1,476,916	$	756,008	$	726,766	$	108.56	$	119.01	$	105.0	18.56	%
2021	1,442,701		1,517,567		633,441		721,480		121.77		129.55		113.4		17.04	%
2020	2,654,466		1,108,641		1,014,518		553,073		87.26		101.71		82.2		13.79	%

(1)The Principal Executive Officer ("PEO") is Lee R. Gibson for all periods presented.

(2)The amount reported is calculated in accordance with SEC Pay versus Performance regulations and does not represent compensation received by our NEOs. See the detail of the calculation in the table below.

(3)For 2022 and 2021, the other NEOs are Julie N. Shamburger, Tim Alexander, Brian K. McCabe and T.L. Arnold, Jr. For 2020, the other NEOs are Julie N. Shamburger, Tim Alexander, Brian K. McCabe and Mark Drennan.

(4)Total Shareholder Return ("TSR").

(5)The peer group consists of the same companies included in our Form 10-K for the performance graph required by Item 201(e) of Regulation S-K. The peer group consists of Cullen/Frost Bankers, Inc. (CFR), First Financial Bankshares, Inc.(FFIN), Hilltop Holdings (HTH), Independent Bank Group, Inc. (IBTX), Prosperity Bancshares, Inc. (PB), Texas Capital Bancshares, Inc. (TCBI) and Veritex Holdings, Inc. (VBTX).

(6)The company-selected measure is ROATCE, a non-GAAP measure. In calculating ROATCE, Southside adds back the after tax amortization expense to net income available to common and subtracts average intangible assets for the period from average shareholders’ equity.

Company Selected Measure Name

ROATCE

Named Executive Officers, Footnote [Text Block]

For 2022 and 2021, the other NEOs are Julie N. Shamburger, Tim Alexander, Brian K. McCabe and T.L. Arnold, Jr. For 2020, the other NEOs are Julie N. Shamburger, Tim Alexander, Brian K. McCabe and Mark Drennan.

Peer Group Issuers, Footnote [Text Block]

The peer group consists of the same companies included in our Form 10-K for the performance graph required by Item 201(e) of Regulation S-K. The peer group consists of Cullen/Frost Bankers, Inc. (CFR), First Financial Bankshares, Inc.(FFIN), Hilltop Holdings (HTH), Independent Bank Group, Inc. (IBTX), Prosperity Bancshares, Inc. (PB), Texas Capital Bancshares, Inc. (TCBI) and Veritex Holdings, Inc. (VBTX).

PEO Total Compensation Amount

$ 1,549,596

$ 1,442,701

$ 2,654,466

PEO Actually Paid Compensation Amount

$ 1,476,916

1,517,567

1,108,641

Adjustment To PEO Compensation, Footnote [Text Block]

The table below shows the calculation and related adjustments for compensation actually paid.


Year	Executive	Summary Compensation Table Total		Subtract: Change in Pension Value		Add: Service Cost and Prior Service Cost (1)		Subtract: Equity Grants at Grant Date Fair Value		Add: Equity Awards Granted at Year-End Value (2)(3)		Add: Change in Value of Unvested Equity Awards (3)(4)		Add: Change in Value of Vested Equity Awards (3)(5)		Compensation Actually Paid
2022	PEO	$	1,549,596	$	—	$	—	$	271,144	$	242,428	$	(9,250)	$	(34,714)	$	1,476,916
	Other NEOs	756,008		—		—		106,333		95,050		(4,777)		(13,182)		726,766
2021	PEO	1,442,701		172,927		—		125,187		139,344		82,083		151,553		1,517,567
	Other NEOs	633,441		3,661		—		46,486		51,742		34,621		51,823		721,480
2020	PEO	2,654,466		1,572,177		198,992		—		—		(94,661)		(77,979)		1,108,641
	Other NEOs	1,014,518		481,273		80,415		3,684		3,739		(32,719)		(27,923)		553,073

(1)Reflects the actuarially determined service cost for services rendered by executives during the reported year (i.e. service cost). We note our Pension Plan was frozen effective December 31, 2020, thus no service cost for 2021 and 2022. Additionally, there was no prior service cost in any of the reported years.

(2)The amount reported reflects equity awards granted during the fiscal year and dividends equivalents accrued during the year of grant, valued as of fiscal year end.

(3)NQSO grant date fair values were calculated using the Black-Scholes option pricing model as of the grant date. We note no NQSOs were granted in any of the years presented. NQSOs have been remeasured as of each measurement date using the

stock price as of the measurement date and updated assumptions: expected term, volatility, dividend yield and risk-free rate as of the measurement date. RSU fair values are calculated using the stock price as of the grant date, and stock price was updated for each measurement period to reflect the stock price on such date. PSUs fair values are calculated using the stock price as of the grant date assuming target performance and was updated for each measurement period to reflect the stock price and expected payout levels as of such date.

(4)The amount reported reflects the increase (decrease) in fair value from prior fiscal year end to fiscal year end for the reporting period for equity awards. Dividend equivalents accrued in the year of the period presented are presented at fair value as of year end. Dividend equivalents accrued in prior periods reflect the change in fair value from prior fiscal year end to the fiscal year end for the reporting period.

(5)The amount reported reflects the increase (decrease) in fair value from prior fiscal year end to the vesting date in the reporting period. Dividend equivalents are included. Dividend equivalents accrued in the year of the period presented are presented at fair value as of the vest date. Dividend equivalents accrued in prior periods reflect the change in fair value from prior fiscal year end to the vesting date for the reporting period.

Non-PEO NEO Average Total Compensation Amount

$ 756,008

633,441

1,014,518

Non-PEO NEO Average Compensation Actually Paid Amount

$ 726,766

721,480

553,073

Adjustment to Non-PEO NEO Compensation Footnote [Text Block]

The table below shows the calculation and related adjustments for compensation actually paid.


Year	Executive	Summary Compensation Table Total		Subtract: Change in Pension Value		Add: Service Cost and Prior Service Cost (1)		Subtract: Equity Grants at Grant Date Fair Value		Add: Equity Awards Granted at Year-End Value (2)(3)		Add: Change in Value of Unvested Equity Awards (3)(4)		Add: Change in Value of Vested Equity Awards (3)(5)		Compensation Actually Paid
2022	PEO	$	1,549,596	$	—	$	—	$	271,144	$	242,428	$	(9,250)	$	(34,714)	$	1,476,916
	Other NEOs	756,008		—		—		106,333		95,050		(4,777)		(13,182)		726,766
2021	PEO	1,442,701		172,927		—		125,187		139,344		82,083		151,553		1,517,567
	Other NEOs	633,441		3,661		—		46,486		51,742		34,621		51,823		721,480
2020	PEO	2,654,466		1,572,177		198,992		—		—		(94,661)		(77,979)		1,108,641
	Other NEOs	1,014,518		481,273		80,415		3,684		3,739		(32,719)		(27,923)		553,073

(2)The amount reported reflects equity awards granted during the fiscal year and dividends equivalents accrued during the year of grant, valued as of fiscal year end.

Compensation Actually Paid vs. Total Shareholder Return [Text Block]

Compensation Actually Paid vs. Net Income [Text Block]

Compensation Actually Paid vs. Company Selected Measure [Text Block]

Tabular List [Table Text Block]


Financial Performance Measure
EPS
ROATCE
Loan Growth

Total Shareholder Return Amount

$ 108.56

121.77

87.26

Peer Group Total Shareholder Return Amount

119.01

129.55

101.71

Net Income (Loss)

$ 105,000,000.0

$ 113,400,000

$ 82,200,000

Company Selected Measure Amount | pURE

0.1856

0.1704

0.1379

PEO Name

Lee R. Gibson

Measure [Axis]: 1

Pay vs Performance Disclosure [Table]

Measure Name

EPS

Measure [Axis]: 2

Pay vs Performance Disclosure [Table]

Measure Name

ROATCE

Non-GAAP Measure Description [Text Block]

The company-selected measure is ROATCE, a non-GAAP measure. In calculating ROATCE, Southside adds back the after tax amortization expense to net income available to common and subtracts average intangible assets for the period from average shareholders’ equity.

Measure [Axis]: 3

Pay vs Performance Disclosure [Table]

Measure Name

Loan Growth

PEO [Member] | Subtract: Change in Pension Value [Member]

Pay vs Performance Disclosure [Table]

Adjustment to Compensation Amount

$ 0

$ 172,927

$ 1,572,177

PEO [Member] | Add: Service Cost and Prior Service Cost [Member]

Pay vs Performance Disclosure [Table]