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Capital and Regulatory Matters - Actual Capital Amounts and Ratios (Details) $ in Thousands | Sep. 30, 2025 USD ($) | Dec. 31, 2024 USD ($)
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Origin Bancorp, Inc. |  |
Common Equity Tier 1 Capital to Risk-Weighted Assets |  |
Actual, amount | $ 1,113,214 | $ 1,085,860
Actual, ratio | 0.1359 | 0.1332
Minimum capital required, amount | $ 573,421 | $ 570,647
Minimum capital required, ratio | 0.0700 | 0.0700
Tier 1 Capital to Risk-Weighted Assets |  |
Actual, amount | $ 1,129,191 | $ 1,101,766
Actual, ratio | 0.1379 | 0.1352
Minimum capital required, amount | $ 696,192 | $ 692,929
Minimum capital required, ratio | 0.0850 | 0.0850
Total Capital to Risk-Weighted Assets |  |
Actual, amount | $ 1,302,509 | $ 1,339,735
Actual, ratio | 0.1590 | 0.1644
Minimum capital required, amount | $ 860,131 | $ 855,670
Minimum capital required, ratio | 0.1050 | 0.1050
Leverage Ratio |  |
Actual, amount | $ 1,129,191 | $ 1,101,766
Actual, ratio | 0.1169 | 0.1108
Minimum capital required, amount | $ 386,283 | $ 397,635
Minimum capital required, ratio | 0.0400 | 0.0400
Origin Bank | Origin Bank |  |
Common Equity Tier 1 Capital to Risk-Weighted Assets |  |
Actual, amount | $ 1,050,761 | $ 1,075,768
Actual, ratio | 0.1293 | 0.1329
Minimum capital required, amount | $ 568,888 | $ 566,620
Minimum capital required, ratio | 0.0700 | 0.0700
Well capitalized, amount | $ 528,253 | $ 526,147
Well capitalized, ratio | 6.50% | 6.50%
Tier 1 Capital to Risk-Weighted Assets |  |
Actual, amount | $ 1,050,761 | $ 1,075,768
Actual, ratio | 0.1293 | 0.1329
Minimum capital required, amount | $ 690,793 | $ 688,038
Minimum capital required, ratio | 0.0850 | 0.0850
To be well capitalized under prompt corrective action provisions, amount | $ 650,158 | $ 647,565
To be well capitalized under prompt corrective action provisions, ratio | 0.0800 | 0.0800
Total Capital to Risk-Weighted Assets |  |
Actual, amount | $ 1,150,884 | $ 1,239,644
Actual, ratio | 0.1416 | 0.1531
Minimum capital required, amount | $ 853,331 | $ 850,353
Minimum capital required, ratio | 0.1050 | 0.1050
To be well capitalized under prompt corrective action provisions, amount | $ 812,697 | $ 809,860
To be well capitalized under prompt corrective action provisions, ratio | 0.1000 | 0.1000
Leverage Ratio |  |
Actual, amount | $ 1,050,761 | $ 1,075,768
Actual, ratio | 0.1097 | 0.1089
Minimum capital required, amount | $ 383,154 | $ 395,154
Minimum capital required, ratio | 0.0400 | 0.0400
To be well capitalized under prompt corrective action provisions, amount | $ 478,942 | $ 493,943
To be well capitalized under prompt corrective action provisions, ratio | 0.0500 | 0.0500

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