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Stock-based Compensation and Benefits - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022
EPS target |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Weighted average grant date fair value |  |  | $ 34.91 |  |  |
NBH Holdings Corp. 2023 Omnibus Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares authorized | 973,985 |  | 973,985 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Reduction in Number of Shares for Every One Option or Stock Appreciation Right Granted |  |  | 1 |  |  |
Employee Stock Option |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Contractual term (in years) |  |  | 10 years |  |  |
Stock based compensation expense | $ 100,000 | $ 500,000 | $ 200,000 | $ 700,000 |  |
Unrecognized compensation expense | 300,000 |  | $ 300,000 |  |  |
Unrecognized compensation cost, weighted-average period, years |  |  | 1 year 7 months 6 days |  |  |
Employee Stock Option | NBH Holdings Corp. 2023 Omnibus Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award Vesting Rights, Percentage |  |  | 33.30% |  |  |
Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Awards granted (in shares) |  |  | 176,151 |  |  |
Restricted Stock | NBH Holdings Corp. 2023 Omnibus Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock based compensation expense | 1,500,000 | 1,200,000 | $ 2,400,000 | 2,100,000 |  |
Unrecognized compensation expense | 7,900,000 |  | $ 7,900,000 |  |  |
Unrecognized compensation cost, weighted-average period, years |  |  | 2 years 3 months 18 days |  |  |
Performance stock units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Awards granted (in shares) |  |  | 79,254 |  |  |
Performance stock units | NBH Holdings Corp. 2023 Omnibus Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock based compensation expense | 500,000 | $ 500,000 | $ 1,000,000.0 | $ 900,000 |  |
Unrecognized compensation expense | $ 4,500,000 |  | $ 4,500,000 |  |  |
Unrecognized compensation cost, weighted-average period, years |  |  | 2 years 2 months 12 days |  |  |
Performance period |  |  | 3 years |  |  |
Performance stock units | NBH Holdings Corp. 2023 Omnibus Incentive Plan | EPS target |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Percentage of awards based on performance type |  |  | 33.00% |  | 60.00% | 60.00%
Performance stock units | NBH Holdings Corp. 2023 Omnibus Incentive Plan | TSR target |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Percentage of awards based on performance type |  |  | 33.00% |  | 40.00% | 40.00%
Performance stock units | NBH Holdings Corp. 2023 Omnibus Incentive Plan | ROTA target |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Percentage of awards based on performance type |  |  | 33.00% |  |  |
Employee Stock | Employee Stock Purchase Plan 2014 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Maximum stock purchases by employees, value |  |  | $ 25,000 |  |  |
Maximum stock purchases by employees (in shares) |  |  | 2,000 |  |  |
Discount on purchase of common stock (as a percent) |  |  | 90.00% |  |  |
Offering period for employee stock purchases |  |  | 6 months |  |  |
Number of shares authorized | 400,000 |  | 400,000 |  |  |
Shares available for issuance | 224,299 |  | 224,299 |  |  |
Employees purchased shares (in shares) |  |  | 11,620 | 9,741 |  |
Minimum | Employee Stock Option |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  | 1 year |  |  |
Minimum | Restricted Stock | NBH Holdings Corp. 2023 Omnibus Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  | 1 year |  |  |
Minimum | Performance stock units | NBH Holdings Corp. 2023 Omnibus Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Percentage of initial target awards |  |  | 0.00% |  |  |
Maximum | Employee Stock Option |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  | 3 years |  |  |
Maximum | Restricted Stock | NBH Holdings Corp. 2023 Omnibus Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  | 3 years |  |  |
Maximum | Performance stock units | NBH Holdings Corp. 2023 Omnibus Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Percentage of initial target awards |  |  | 150.00% |  |  |
2Unifi LLC | Class B Units | Share-based payment arrangement | 2023 Equity Unit Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options granted in period |  |  | 122,000 |  | 112,000 |
Vesting period |  |  | 5 years |  |  |
Unrecognized compensation expense | $ 100,000 |  | $ 100,000 |  |  |
2Unifi LLC | Class B Units | Share-based payment arrangement | 2023 Equity Unit Incentive Plan | EPS target |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award Vesting Rights, Percentage |  |  | 50.00% |  |  |
2Unifi LLC | Class B Units | Share-based payment arrangement | 2023 Equity Unit Incentive Plan | TSR target |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award Vesting Rights, Percentage |  |  | 25.00% |  |  |
2Unifi LLC | Class B Units | Maximum | Share-based payment arrangement | 2023 Equity Unit Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options granted in period |  |  |  |  | 200,000 |

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