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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 [Table] |  |  |  |  |  |
Disclosure - Pay vs Performance Disclosure |  |
|  |  |  |  | Value of Initial Fixed $100 Investment(3) based on: |  |
Year | Summary Compensation Table (“SCT”) Total for CEO $ | Compensation Actually Paid to CEO(1) $ | Average SCT Total Compensation for Non-CEO NEOs $ | Average Compensation Actually Paid to Non-CEO NEOs(2) $ | TSR For OBK $ | TSR For Peer Group $ | Net Income $ | ROAA %
2024 | 2,544,663 | 2,210,474 | 1,005,488 | 1,066,999 | 95.23 | 125.60 | 76,492,000 | 0.77
2023 | 1,722,491 | 1,107,614 | 976,775 | 799,804 | 99.86 | 108.99 | 83,800,000 | 0.84
2022 | 10,218,272 | 10,110,197 | 1,168,452 | 1,084,150 | 101.09 | 111.12 | 87,715,000 | 1.01
2021 | 2,079,384 | 5,251,965 | 780,066 | 850,215 | 116.60 | 121.03 | 108,546,000 | 1.45
2020 | 1,563,690 | (167,745) | 695,203 | 674,913 | 74.53 | 89.64 | 36,357,000 | 0.56
Named Executive Officers, Footnote [Text Block] |  | Drake Mills served as CEO & President of Origin Bancorp, Inc. for each of the years presented in the table. |  |  |  |
Peer Group Issuers, Footnote [Text Block] |  | Cumulative TSR assumes an initial investment of $100 at the market close on December 31, 2019, in OBK common stock and in the common stock of companies within our peer group. TSR for OBK stock was (25.47)% in 2020, 56.45% in 2021, (13.30)% in 2022, (1.22)% in 2023, and (4.64)% in 2024, for a cumulative five-year TSR of (4.77)%. A $100 investment in OBK stock on December 31, 2019, would be valued at $95.23 at December 31, 2024, which underperformed our peers as measured by the Nasdaq OMX ABA Community Bank, the peer group used for this purpose. |  |  |  |
Total Compensation in SCT |  | $ 2,544,663 | $ 1,722,491 | $ 10,218,272 | $ 2,079,384 | $ 1,563,690
PEO Actually Paid Compensation Amount | [1] | 2,210,474 | 1,107,614 | 10,110,197 | 5,251,965 | (167,745)
Total Compensation in SCT |  | 1,005,488 | 976,775 | 1,168,452 | 780,066 | 695,203
Non-PEO NEO Average Compensation Actually Paid Amount | [2] | $ 1,066,999 | 799,804 | 1,084,150 | 850,215 | 674,913
Adjustment to Non-PEO NEO Compensation Footnote [Text Block] |  | The NEOs for each of the years presented in the table were as follows: for 2024 and 2023, William Wallace, IV, M. Lance Hall, Derek McGee and Preston Moore; for 2022, William Wallace, IV, M. Lance Hall, Stephen Brolly, Derek McGee and Preston Moore; for 2021, Stephen Brolly, M. Lance Hall, Jim Crotwell and Preston Moore; for 2020, Stephen Brolly, M. Lance Hall, Cary Davis and Preston Moore; |  |  |  |
Compensation Actually Paid vs. Total Shareholder Return [Text Block] |  |
|  |  |  |  | 2025 Proxy Statement | 87
|  | EXECUTIVE COMPENSATION |  |  |  |  |
|  |  |  | Value of Initial Fixed $100 Investment based on:
Year | Compensation Actually Paid to CEO $ | Average Compensation Actually Paid to Non-CEO NEOs $ | TSR For OBK $ | TSR For Peer Group $
2024 | 2,210,474 |  | 1,066,999 |  | 95.23 |  | 125.60 |
2023 | 1,107,614 |  | 799,804 |  | 99.86 |  | 108.99 |
2022 | 10,110,197 |  | 1,084,150 |  | 101.09 |  | 111.12 |
2021 | 5,251,965 |  | 850,215 |  | 116.60 |  | 121.03 |
2020 | (167,745 | ) | 674,913 |  | 74.53 |  | 89.64 |
Compensation Actually Paid vs. Net Income [Text Block] |  | The graph below describes the relationship between compensation actually paid to our CEO and to our Non-CEO NEOs (as calculated above) and our Net Income for the indicated years.
Year | Compensation Actually Paid to CEO $ | Average Compensation Actually Paid to the Non-CEO NEOs $ | Net Income $
2024 | 2,210,474 |  | 1,066,999 |  | 76,492,000 |
2023 | 1,107,614 |  | 799,804 |  | 83,800,000 |
2022 | 10,110,197 |  | 1,084,150 |  | 87,715,000 |
2021 | 5,251,965 |  | 850,215 |  | 108,546,000 |
2020 | (167,745 | ) | 674,913 |  | 36,357,000 |
Compensation Actually Paid vs. Company Selected Measure [Text Block] |  | The graph below describes the relationship between compensation actually paid to our CEO and to our non-CEO NEOs (as calculated above) and our ROAA for the indicated years.
Year | Compensation Actually Paid to CEO $ | Average Compensation Actually Paid to the Non-CEO NEOs $ | ROAA %
2024 | 2,210,474 |  | 1,066,999 |  | 0.77 |
2023 | 1,107,614 |  | 799,804 |  | 0.84 |
2022 | 10,110,197 |  | 1,084,150 |  | 1.01 |
2021 | 5,251,965 |  | 850,215 |  | 1.45 |
2020 | (167,745 | ) | 674,913 |  | 0.56 |
Tabular List [Table Text Block] |  | Most Important Measures to Determine 2024 Compensation Actually Paid ROAA ROAE Nonperforming asset ratio, as defined in the STIP Net charge-off ratio |  |  |  |
Total Shareholder Return Amount |  | $ 95.23 | 99.86 | 101.09 | 116.60 | 74.53
Peer Group Total Shareholder Return Amount | [3] | 125.60 | 108.99 | 111.12 | 121.03 | 89.64
Net Income (Loss) Attributable to Parent |  | $ 76,492,000 | $ 83,800,000 | $ 87,715,000 | $ 108,546,000 | $ 36,357,000
Company Selected Measure Amount |  | 0.0077 | 0.0084 | 0.0101 | 0.0145 | 0.0056
PEO Name |  | Drake Mills |  |  |  |
Measure [Axis]: 1 |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
Measure Name |  | ROAA |  |  |  |
Measure [Axis]: 2 |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
Measure Name |  | ROAE |  |  |  |
Measure [Axis]: 3 |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
Measure Name |  | Nonperforming asset ratio, as defined in the STIP |  |  |  |
Measure [Axis]: 4 |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
Measure Name |  | Net charge-off ratio |  |  |  |
PEO [Member] | Change In The Actuarial Present Values Reported Under Column Change In Pension Value And Nonqualified Deferred Compensation Earnings Of S C T [Member] |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
Plus: dividends paid on stock awards not included in total compensation |  | $ (4,899) |  | $ (126,437) | $ (122,705) | $ (119,082)
PEO [Member] | Service Cost For Pension Plans [Member] |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
Plus: dividends paid on stock awards not included in total compensation |  | 173,422 | 173,663 | 197,558 | 191,728 | 186,065
PEO [Member] | Stock Awards Reported In S C T [Member] |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
Plus: dividends paid on stock awards not included in total compensation |  | (1,002,988) | (417,884) | (8,642,860) | (500,031) |
PEO [Member] | Fair Value At Fiscal Year End Of Unvested Stock Awards Granted During Covered Fiscal Year [Member] |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
Plus: dividends paid on stock awards not included in total compensation | [4] | 1,170,909 | 187,489 | 8,533,441 | 531,221 |
PEO [Member] | Change In Fair Value At Fiscal Year End Of Unvested Stock Awards Granted In Any Prior Fiscal Year [Member] |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
Plus: dividends paid on stock awards not included in total compensation | [5] | (646,624) | (526,929) | (85,469) | 166,302 | (165,803)
PEO [Member] | Change In Fair Value At Vesting Date Of Stock Awards Granted In Any Prior Fiscal Year [Member] |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
Plus: dividends paid on stock awards not included in total compensation |  | (34,729) | (49,438) | 4,175 | 101,912 | (67,338)
PEO [Member] | Change In Fair Value At Fiscal Year End Of Unexercised Stock Options Granted In Any Prior Fiscal Year [Member] |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
Plus: dividends paid on stock awards not included in total compensation | [6] |  |  |  |  | (1,568,350)
PEO [Member] | Change In Fair Value At Exercising Date Of Stock Options Granted In Any Prior Fiscal Year [Member] |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
Plus: dividends paid on stock awards not included in total compensation |  |  |  |  | 2,798,556 |
PEO [Member] | Dividends Paid On Stock Awards Not Included In Total Compensation [Member] |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
Plus: dividends paid on stock awards not included in total compensation |  | 10,720 | 18,222 | 11,517 | 5,598 | 3,073
Non-PEO NEO [Member] | Change In The Actuarial Present Values Reported Under Column Change In Pension Value And Nonqualified Deferred Compensation Earnings Of S C T [Member] |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
Plus: dividends paid on stock awards not included in total compensation |  |  |  | (37,634) | (19,736) | (27,833)
Non-PEO NEO [Member] | Service Cost For Pension Plans [Member] |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
Plus: dividends paid on stock awards not included in total compensation |  | 10,610 | 11,127 | 35,192 | 42,405 | 58,172
Non-PEO NEO [Member] | Stock Awards Reported In S C T [Member] |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
Plus: dividends paid on stock awards not included in total compensation |  | (229,426) | (229,337) | (387,956) | (93,768) |
Non-PEO NEO [Member] | Fair Value At Fiscal Year End Of Unvested Stock Awards Granted During Covered Fiscal Year [Member] |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
Plus: dividends paid on stock awards not included in total compensation | [7] | 267,810 | 102,895 | 313,110 | 99,617 |
Non-PEO NEO [Member] | Change In Fair Value At Fiscal Year End Of Unvested Stock Awards Granted In Any Prior Fiscal Year [Member] |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
Plus: dividends paid on stock awards not included in total compensation | [8] | 24,168 | (59,002) | (8,589) | 24,213 | (23,914)
Non-PEO NEO [Member] | Change In Fair Value At Vesting Date Of Stock Awards Granted In Any Prior Fiscal Year [Member] |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
Plus: dividends paid on stock awards not included in total compensation |  | (15,248) | (5,386) | 413 | 16,603 | (27,905)
Non-PEO NEO [Member] | Dividends Paid On Stock Awards Not Included In Total Compensation [Member] |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |
Plus: dividends paid on stock awards not included in total compensation |  | $ 3,597 | $ 2,732 | $ 1,162 | $ 815 | $ 1,190
[1] | Drake Mills served as CEO & President of Origin Bancorp, Inc. for each of the years presented in the table.
[2] | The NEOs for each of the years presented in the table were as follows: for 2024 and 2023, William Wallace, IV, M. Lance Hall, Derek McGee and Preston Moore; for 2022, William Wallace, IV, M. Lance Hall, Stephen Brolly, Derek McGee and Preston Moore; for 2021, Stephen Brolly, M. Lance Hall, Jim Crotwell and Preston Moore; for 2020, Stephen Brolly, M. Lance Hall, Cary Davis and Preston Moore;
[3] | Cumulative TSR assumes an initial investment of $100 at the market close on December 31, 2019, in OBK common stock and in the common stock of companies within our peer group. TSR for OBK stock was (25.47)% in 2020, 56.45% in 2021, (13.30)% in 2022, (1.22)% in 2023, and (4.64)% in 2024, for a cumulative five-year TSR of (4.77)%. A $100 investment in OBK stock on December 31, 2019, would be valued at $95.23 at December 31, 2024, which underperformed our peers as measured by the Nasdaq OMX ABA Community Bank, the peer group used for this purpose.
[4] | We measure the fair value of the RSUs and RSAs at each fiscal year end by multiplying the closing market price of our common stock on the last trading day of the year by the number of shares or units that have not vested. We measure the fair value of the PSUs awarded under the LTIP, which are subject to performance conditions as dictated by the award agreements, based on actual performance at fiscal year end. We measure the fair value of the 129,735 CEO One-Time PSU Award granted on December 13, 2022, using a Monte-Carlo Simulation valuation performed at fiscal year end.
[5] | We remeasure the fair value of the RSUs and RSAs at each fiscal year end by multiplying the closing market price of our common stock on the last trading day of the year by the number of shares or units that have not vested minus the prior fiscal year end fair value of identical awards. We remeasure the fair value of the PSUs awarded, but not yet vested, under the LTIP based on actual performance attained at each fiscal year end minus the fair value of identical awards at the prior fiscal year end. Please see the LTIP PSU table below for actual performance at each fiscal year end by grant date. We remeasured the fair value of the 129,735 CEO One-Time PSU Award granted on December 13, 2022, using a Monte-Carlo Simulation valuation performed at each fiscal year end. The assumptions used in calculating the fair value of the one time PSUs and the final fair value are shown below in the Monte-Carlo Simulation Valuation Inputs and Results table.
[6] | The fair value of the stock options was determined using the Black-Scholes model. The assumptions used in calculating the fair value of the stock options were shown below:
[7] | We measure the fair value of the RSUs and RSAs at each fiscal year end by multiplying the closing market price of our common stock on the last trading day of the year by the number of shares or units that have not vested. We measure the fair value of the PSUs awarded under the LTIP, which are subject to performance conditions as dictated by the award agreements, based on actual performance at fiscal year end.
[8] | We remeasure the fair value of the RSUs and RSAs at each fiscal year end by multiplying the closing market price of our common stock on the last trading day of the year by the number of shares or units that have not vested minus the prior fiscal year end fair value of identical awards. We remeasure the fair value of the PSUs awarded, but not yet vested, under the LTIP based on actual performance attained at each fiscal year end minus the fair value of identical awards at the prior fiscal year end. Please see the LTIP PSU table above for the actual performance at each fiscal year end by grant date.

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