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Master Netting and Similar Agreements – Repurchase, Reverse Repurchase, and Securities Borrowing Transactions (Tables)
 3 Months Ended
Mar. 31, 2026
Offsetting [Abstract]  
Schedule of Securities Purchased under Agreements to Resell and Collateral Pledged by Counterparties
The following table provides details of securities purchased under agreements to resell and collateral pledged by counterparties as of March 31, 2026 and December 31, 2025.
SECURITIES PURCHASED UNDER AGREEMENTS TO RESELL
    Gross amounts not offset in the
Balance Sheets		 
(Dollars in millions)Gross amounts
of recognized
assets		Gross amounts
offset in the
Balance Sheets		Net amounts of
assets presented
in the Balance Sheets		Offsetting
securities sold
under agreements
to repurchase		Securities collateral
(not recognized on
FHN’s Balance Sheets)		Net amount
Securities purchased under agreements to resell:
March 31, 2026$746 $— $746 $(18)$(724)$4 
December 31, 2025613 — 613 (5)(604)4 
Schedule of Securities Sold under Agreements to Repurchase and Collateral Pledged by Company
The following table provides details of securities sold under agreements to repurchase and collateral pledged by FHN as of March 31, 2026 and December 31, 2025.
SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE
    Gross amounts not offset in the
Balance Sheets		 
(Dollars in millions)Gross amounts
of recognized
liabilities		Gross amounts
offset in the
Balance Sheets		Net amounts of
liabilities presented
in the Balance Sheets		Offsetting
securities
purchased under
agreements to resell		Securities/
government
guaranteed loans
collateral		Net amount
Securities sold under agreements to repurchase:
March 31, 2026$1,400 $— $1,400 $(18)$(1,382)$— 
December 31, 20251,973 — 1,973 (5)(1,968)— 
Schedule of the Remaining Contractual Maturity by Collateral Type of Securities Sold under Agreements to Repurchase
The following table provides details, by collateral type, of the remaining contractual maturity of securities sold under agreements to repurchase as of March 31, 2026 and December 31, 2025.
MATURITIES OF SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE
 March 31, 2026
(Dollars in millions)Overnight and
Continuous		Up to 30 DaysTotal
Securities sold under agreements to repurchase:
U.S. treasuries$18 $— $18 
Government agency issued MBS972 — 972 
Government agency issued CMO410 — 410 
Total securities sold under agreements to repurchase$1,400 $— $1,400 
December 31, 2025
(Dollars in millions)Overnight and
Continuous		Up to 30 DaysTotal
Securities sold under agreements to repurchase:
U.S. treasuries$5 $— $5 
Government agency issued MBS1,558 — 1,558 
Government agency issued CMO386 — 386 
Other U.S. government agencies24 — 24 
Total securities sold under agreements to repurchase$1,973 $— $1,973