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Regulatory Capital - Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations (Details) $ in Thousands | Sep. 30, 2025 USD ($) | Dec. 31, 2024 USD ($)
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Banking Regulation, Risk-Based Information [Abstract] |  |
Capital ($) | $ 988,094 | $ 935,189
Capital to RWA (%) | 0.1599 | 0.1537
Capital Required for Capital Adequacy ($) | $ 648,977 | $ 639,015
Capital Required for Capital Adequacy to RWA (%) | 0.105 | 0.105
Tier One Risk Based Capital ($) | $ 836,042 | $ 780,096
Tier One Risk Based Capital to RWA (%) | 0.1353 | 0.1282
Tier One Risk Based Capital Required for Capital Adequacy ($) | $ 525,362 | $ 517,298
Tier One Risk Based Capital Required for Capital Adequacy to RWA (%) | 0.085 | 0.085
Common Equity Tier One Risk Based Capital ($) | $ 811,623 | $ 755,816
Common Equity Tier One Risk Based Capital To RWA (%) | 0.1313 | 0.1242
Common Equity Tier One Risk Based Capital Required For Capital Adequacy ($) | $ 432,651 | $ 426,010
Common Equity Tier One Risk Based Capital Required for Capital Adequacy to RWA (%) | 0.07 | 0.07
Tier One Leverage Capital to Average Assets | $ 836,042 | $ 780,096
Tier One Leverage Capital to Average Assets (%) | 0.1092 | 0.1033
Tier One Leverage Capital Required for Capital Adequacy ($) | $ 306,377 | $ 301,976
Tier One Leverage Capital Required for Capital Adequacy to Average Assets (%) | 0.04 | 0.04
First Mid Bank |  |
Banking Regulation, Risk-Based Information [Abstract] |  |
Capital ($) | $ 905,926 | $ 880,621
Capital to RWA (%) | 0.1472 | 0.1451
Capital Required for Capital Adequacy ($) | $ 646,397 | $ 637,089
Capital Required for Capital Adequacy to RWA (%) | 0.105 | 0.105
Capital Required to be Well Capitalized ($) | $ 615,616 | $ 606,752
Capital Required to be Well Capitalized to RWA (%) | 0.10 | 0.10
Tier One Risk Based Capital ($) | $ 833,519 | $ 813,000
Tier One Risk Based Capital to RWA (%) | 0.1354 | 0.134
Tier One Risk Based Capital Required for Capital Adequacy with Capital Buffer ($) | $ 523,273 | $ 515,739
Tier One Risk Based Capital Required for Capital Adequacy with Capital Buffer to RWA (%) | 0.085 | 0.085
Tier One Risk Based Capital Required to be Well Capitalized ($) | $ 492,493 | $ 485,401
Tier One Risk Based Capital Required to be Well Capitalized to RWA (%) | 0.08 | 0.08
Common Equity Tier One Risk Based Capital ($) | $ 833,519 | $ 813,000
Common Equity Tier One Risk Based Capital To RWA (%) | 0.1354 | 0.134
Common Equity Tier One Risk Based Capital Required For Capital Adequacy ($) | $ 430,931 | $ 424,726
Common Equity Tier One Risk Based Capital Required for Capital Adequacy to RWA (%) | 0.07 | 0.07
Common Equity Tier One Risk Based Capital Required to Be Well Capitalized ($) | $ 400,150 | $ 394,389
Common Equity Tier One Risk Based Capital Required To Be Well Capitalized to RiWA (%) | 0.065 | 0.065
Tier One Leverage Capital to Average Assets | $ 833,519 | $ 813,000
Tier One Leverage Capital to Average Assets (%) | 0.1094 | 0.1082
Tier One Leverage Capital Required for Capital Adequacy ($) | $ 304,845 | $ 300,596
Tier One Leverage Capital Required for Capital Adequacy to Average Assets (%) | 0.04 | 0.04
Tier One Leverage Capital Required to be Well Capitalized ($) | $ 381,056 | $ 375,745
Tier One Leverage Capital Required to be Well Capitalized to Average Assets (%) | 0.05 | 0.05

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