| Cover | 12 Months Ended |
| Dec. 31, 2022 | |
| Cover [Abstract] | |
| Document Type | DEF 14A |
| Entity Registrant Name | Origin Bancorp, Inc. |
| Entity Central Index Key | 0001516912 |
| Amendment Flag | false |
| 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] | (1) (2) (3) (3) Value of Initial Fixed (3) Year Summary Compensation (1) Average Average (2) TSR TSR Net Income ROAA 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 | |||
| Company Selected Measure Name | ROAA | |||
| Peer Group Issuers, Footnote [Text Block] | Cumulative TSR assumes an initial investment of $100 at the market close on December 31, 2019, in OBNK common stock and in the common stock of companies within our peer group. TSR for OBNK stock was (25.47)% in 2020, 56.45% in 2021 and (13.30)% in 2022, for a cumulative three-year TSR of 1.09%. A $100 investment in OBNK stock on December 31, 2019, would be valued at $101.09 at December 31, 2022, which slightly underperformed our peers as measured by the Nasdaq OMX ABA Community Bank. The peer group used for this purpose is the Nasdaq OMX ABA Community Bank. | |||
| PEO Total Compensation Amount | $ 10,218,272 | $ 2,079,384 | $ 1,563,690 | |
| PEO Actually Paid Compensation Amount | [1] | 10,110,197 | 5,251,965 | (167,745) |
| Non-PEO NEO Average Total Compensation Amount | 1,168,452 | 780,066 | 695,203 | |
| Non-PEO NEO Average Compensation Actually Paid Amount | [2] | $ 1,084,150 | 850,215 | 674,913 |
| Adjustment to Non-PEO NEO Compensation Footnote [Text Block] | The Named Executive Officers for each of the years presented in the table were as follows: 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] | Value of Initial Fixed $100 Investment Year Compensation Actually Average Compensation TSR TSR 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 Average Compensation Net Income 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 Average Compensation ROAA 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 2022 Compensation Actually Paid ROAA ROAE Nonperforming asset ratio, as defined in the STIP Net charge-off ratio, as defined in the STIP | |||
| Total Shareholder Return Amount | [3] | $ 101.09 | 116.60 | 74.53 |
| Peer Group Total Shareholder Return Amount | [3] | 111.12 | 121.03 | 89.64 |
| Net Income (Loss) | $ 87,715,000 | $ 108,546,000 | $ 36,357,000 | |
| Company Selected Measure Amount | 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, as defined in the STIP | |||
| PEO [Member] | Change in the actuarial present values reported under column Change in Pension Value and Nonqualified Deferred Compensation Earnings of SCT | ||||
| Pay vs Performance Disclosure [Table] | ||||
| Adjustment to Compensation Amount | $ (126,437) | $ (122,705) | $ (119,082) | |
| PEO [Member] | Service cost for pension plans | ||||
| Pay vs Performance Disclosure [Table] | ||||
| Adjustment to Compensation Amount | 197,558 | 191,728 | 186,065 | |
| PEO [Member] | Stock awards reported in SCT | ||||
| Pay vs Performance Disclosure [Table] | ||||
| Adjustment to Compensation Amount | (8,642,860) | (500,031) | ||
| PEO [Member] | Fair value at fiscal year-end of unvested stock awards granted during covered fiscal year | ||||
| Pay vs Performance Disclosure [Table] | ||||
| Adjustment to Compensation Amount | [4] | 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 | ||||
| Pay vs Performance Disclosure [Table] | ||||
| Adjustment to Compensation Amount | (85,469) | 166,302 | (165,803) | |
| PEO [Member] | Change in fair value at vesting date of stock awards granted in any prior fiscal year | ||||
| Pay vs Performance Disclosure [Table] | ||||
| Adjustment to Compensation Amount | 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 | ||||
| Pay vs Performance Disclosure [Table] | ||||
| Adjustment to Compensation Amount | [5] | (1,568,350) | ||
| PEO [Member] | Change in fair value at exercising date of stock options granted in any prior fiscal year | ||||
| Pay vs Performance Disclosure [Table] | ||||
| Adjustment to Compensation Amount | 2,798,556 | |||
| PEO [Member] | Dividends paid on stock awards not included in total compensation | ||||
| Pay vs Performance Disclosure [Table] | ||||
| Adjustment to Compensation Amount | 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 SCT | ||||
| Pay vs Performance Disclosure [Table] | ||||
| Adjustment to Compensation Amount | (37,634) | (19,736) | (27,833) | |
| Non-PEO NEO [Member] | Service cost for pension plans | ||||
| Pay vs Performance Disclosure [Table] | ||||
| Adjustment to Compensation Amount | 35,192 | 42,405 | 58,172 | |
| Non-PEO NEO [Member] | Stock awards reported in SCT | ||||
| Pay vs Performance Disclosure [Table] | ||||
| Adjustment to Compensation Amount | (387,956) | (93,768) | ||
| Non-PEO NEO [Member] | Fair value at fiscal year-end of unvested stock awards granted during covered fiscal year | ||||
| Pay vs Performance Disclosure [Table] | ||||
| Adjustment to Compensation Amount | [6] | 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 | ||||
| Pay vs Performance Disclosure [Table] | ||||
| Adjustment to Compensation Amount | (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 | ||||
| Pay vs Performance Disclosure [Table] | ||||
| Adjustment to Compensation Amount | 413 | 16,603 | (27,905) | |
| Non-PEO NEO [Member] | Dividends paid on stock awards not included in total compensation | ||||
| Pay vs Performance Disclosure [Table] | ||||
| Adjustment to Compensation Amount | $ 1,162 | $ 815 | $ 1,190 | |
| [1] Drake Mills The Named Executive Officers for each of the years presented in the table were as follows: 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; Cumulative TSR assumes an initial investment of $100 at the market close on December 31, 2019, in OBNK common stock and in the common stock of companies within our peer group. TSR for OBNK stock was (25.47)% in 2020, 56.45% in 2021 and (13.30)% in 2022, for a cumulative three-year TSR of 1.09%. A $100 investment in OBNK stock on December 31, 2019, would be valued at $101.09 at December 31, 2022, which slightly underperformed our peers as measured by the Nasdaq OMX ABA Community Bank. The peer group used for this purpose is the Nasdaq OMX ABA Community Bank. | ||||
