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Pay vs Performance Disclosure | 12 Months Ended
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Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Pay vs Performance Disclosure |  |  |  |  |
Company Selected Measure Name | ROATCE |  |  |  |
Named Executive Officers, Footnote | For 2024, the other NEOs are Julie N. Shamburger, T.L. Arnold, Jr., Brian K. McCabe and Keith Donahoe. For 2023, 2022 and 2021, the other NEOs are Ms. Shamburger, Tim Alexander, Mr. McCabe and Mr. Arnold. For 2020, the other NEOs are Ms. Shamburger, Mr. Alexander, Mr. McCabe and Mark Drennan. |  |  |  |
Peer Group Issuers, Footnote | 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. For 2020-2023, the peer group consisted 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). For 2024, the peer group consisted of the same peer companies used in prior years, excluding IBTX. |  |  |  |
PEO Total Compensation Amount | $ 1,991,442 | $ 2,134,717 | $ 1,549,596 | $ 1,442,701 | $ 2,654,466
PEO Actually Paid Compensation Amount | $ 1,828,097 | 1,267,253 | 1,476,916 | 1,517,567 | 1,108,641
Adjustment To PEO Compensation, Footnote | 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
2024 |  | PEO |  | $ | 1,991,442 |  |  | $ | 277,612 |  |  | $ | — |  |  | $ | 422,505 |  |  | $ | 514,583 |  |  | $ | 27,200 |  |  | $ | (5,011) |  |  | $ | 1,828,097 |
| Other NEOs |  | 787,699 |  |  | 20,352 |  |  | — |  |  | 116,343 |  |  | 141,723 |  |  | 8,787 |  |  | (1,189) |  |  | 800,325 |
2023 |  | PEO |  | 2,134,717 |  |  | 769,701 |  |  | — |  |  | 283,353 |  |  | 228,198 |  |  | (26,882) |  |  | (15,726) |  |  | 1,267,253 |
| Other NEOs |  | 833,303 |  |  | 156,007 |  |  | — |  |  | 110,117 |  |  | 88,683 |  |  | (10,409) |  |  | (7,365) |  |  | 638,088 |
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 thereafter. 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. For 2024, the PSUs were adjusted to the expected performance (125%) as of period end. For all other reporting periods the PSUs reflect 100%. (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 | $ 787,699 | 833,303 | 756,008 | 633,441 | 1,014,518
Non-PEO NEO Average Compensation Actually Paid Amount | $ 800,325 | 638,088 | 726,766 | 721,480 | 553,073
Adjustment to Non-PEO NEO Compensation Footnote | 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
2024 |  | PEO |  | $ | 1,991,442 |  |  | $ | 277,612 |  |  | $ | — |  |  | $ | 422,505 |  |  | $ | 514,583 |  |  | $ | 27,200 |  |  | $ | (5,011) |  |  | $ | 1,828,097 |
| Other NEOs |  | 787,699 |  |  | 20,352 |  |  | — |  |  | 116,343 |  |  | 141,723 |  |  | 8,787 |  |  | (1,189) |  |  | 800,325 |
2023 |  | PEO |  | 2,134,717 |  |  | 769,701 |  |  | — |  |  | 283,353 |  |  | 228,198 |  |  | (26,882) |  |  | (15,726) |  |  | 1,267,253 |
| Other NEOs |  | 833,303 |  |  | 156,007 |  |  | — |  |  | 110,117 |  |  | 88,683 |  |  | (10,409) |  |  | (7,365) |  |  | 638,088 |
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 thereafter. 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. For 2024, the PSUs were adjusted to the expected performance (125%) as of period end. For all other reporting periods the PSUs reflect 100%. (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. |  |  |  |
Compensation Actually Paid vs. Total Shareholder Return |  |  |  |  |
Compensation Actually Paid vs. Net Income |  |  |  |  |
Compensation Actually Paid vs. Company Selected Measure |  |  |  |  |
Tabular List, Table |
Financial Performance Measure
EPS
ROATCE
Loan Growth
Total Shareholder Return Amount | $ 105.10 | 98.91 | 108.56 | 121.77 | 87.26
Peer Group Total Shareholder Return Amount | 131.64 | 110.86 | 119.01 | 129.55 | 101.71
Net Income (Loss) | $ 88,500,000 | $ 86,700,000 | $ 105,000,000.0 | $ 113,400,000 | $ 82,200,000
Company Selected Measure Amount | pURE | 0.1492 | 0.1603 | 0.1856 | 0.1704 | 0.1379
PEO Name | Lee R. Gibson |  |  |  |
Measure:: 1 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | EPS |  |  |  |
Measure:: 2 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | ROATCE |  |  |  |
Non-GAAP Measure Description | 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 shareholders and subtracts average intangible assets for the period from average shareholders’ equity. |  |  |  |
Measure:: 3 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Loan Growth |  |  |  |
PEO | Subtract: Change in Pension Value [Member] |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | $ (277,612) | $ (769,701) | $ 0 | $ (172,927) | $ (1,572,177)
PEO | Add: Service Cost and Prior Service Cost [Member] |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 0 | 0 | 0 | 0 | 198,992
PEO | Subtract: Equity Grants at Grant Date Fair Value [Member] |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | (422,505) | (283,353) | (271,144) | (125,187) | 0
PEO | Add: Equity Awards Granted at Year-End Value [Member] |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 514,583 | 228,198 | 242,428 | 139,344 | 0
PEO | Add: Change in Value of Unvested Equity Awards [Member] |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 27,200 | (26,882) | (9,250) | 82,083 | (94,661)
PEO | Add: Change in Value of Vested Equity Awards [Member] |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | (5,011) | (15,726) | (34,714) | 151,553 | (77,979)
Non-PEO NEO | Subtract: Change in Pension Value [Member] |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | (20,352) | (156,007) | 0 | (3,661) | (481,273)
Non-PEO NEO | Add: Service Cost and Prior Service Cost [Member] |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 0 | 0 | 0 | 0 | 80,415
Non-PEO NEO | Subtract: Equity Grants at Grant Date Fair Value [Member] |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | (116,343) | (110,117) | (106,333) | (46,486) | (3,684)
Non-PEO NEO | Add: Equity Awards Granted at Year-End Value [Member] |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 141,723 | 88,683 | 95,050 | 51,742 | 3,739
Non-PEO NEO | Add: Change in Value of Unvested Equity Awards [Member] |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 8,787 | (10,409) | (4,777) | 34,621 | (32,719)
Non-PEO NEO | Add: Change in Value of Vested Equity Awards [Member] |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | $ (1,189) | $ (7,365) | $ (13,182) | $ 51,823 | $ (27,923)

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