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Award Timing Disclosure	12 Months Ended
Award Timing Disclosure	Dec. 31, 2025
Award Timing Disclosures [Line Items]
Award Timing MNPI Disclosure	The Compensation Committee approves and grants equity awards at approximately the same time each year, with awards typically granted each year at the February meeting. Outside of the annual grant cycle, we may also award equity compensation in connection with a new hire package, retention grant or severance package. We do not currently grant stock options as part of any of our compensation programs. If stock options were to be granted in the future, FHN would not grant such options in anticipation of the release of material nonpublic information, and the timing of the release of material non-public information would not be based on option grant dates.
Award Timing Method	The Compensation Committee approves and grants equity awards at approximately the same time each year, with awards typically granted each year at the February meeting. Outside of the annual grant cycle, we may also award equity compensation in connection with a new hire package, retention grant or severance package.
Award Timing Predetermined	true
Award Timing MNPI Considered	true
Award Timing, How MNPI Considered	If stock options were to be granted in the future, FHN would not grant such options in anticipation of the release of material nonpublic information, and the timing of the release of material non-public information would not be based on option grant dates.
MNPI Disclosure Timed for Compensation Value	false