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Investment Securities (Tables)
3 Months Ended
Mar. 31, 2025
Marketable Securities [Abstract]  
Schedule of FHN's Investment Securities
The following tables summarize FHN’s investment securities as of March 31, 2025 and December 31, 2024:
INVESTMENT SECURITIES AT MARCH 31, 2025
 March 31, 2025
(Dollars in millions)Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair
Value
Securities available for sale:
Government agency issued MBS$4,183 $$(436)$3,750 
Government agency issued CMO3,192 (280)2,913 
Other U.S. government agencies1,200 (129)1,073 
States and municipalities381 — (42)339 
Total securities available for sale (a)$8,956 $6 $(887)$8,075 
Securities held to maturity:
Government agency issued MBS$793 $— $(95)$698 
Government agency issued CMO465 — (71)394 
Total securities held to maturity (a)$1,258 $ $(166)$1,092 
(a)Includes $7.0 billion of securities available for sale and $1.2 billion of securities held to maturity pledged to secure public deposits, securities sold under agreements to repurchase, and for other purposes.
INVESTMENT SECURITIES AT DECEMBER 31, 2024
 December 31, 2024
(Dollars in millions)Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair
Value
Securities available for sale:
Government agency issued MBS$4,223 $$(522)$3,702 
Government agency issued CMO3,079 — (312)2,767 
Other U.S. government agencies1,234 — (161)1,073 
States and municipalities394 — (40)354 
Total securities available for sale (a)$8,930 $$(1,035)$7,896 
Securities held to maturity:
Government agency issued MBS$804 $— $(109)$695 
Government agency issued CMO466 — (78)388 
Total securities held to maturity (a)$1,270 $— $(187)$1,083 
(a)Includes $6.9 billion of securities available for sale and $1.3 billion of securities held to maturity pledged to secure public deposits, securities sold under agreements to repurchase, and for other purposes.
Schedule of Amortized Cost and Fair Value by Contractual Maturity
The amortized cost and fair value by contractual maturity for the debt securities portfolio as of March 31, 2025 is provided below:

DEBT SECURITIES PORTFOLIO MATURITIES
 Held to MaturityAvailable for Sale
(Dollars in millions)Amortized
Cost
Fair
Value
Amortized
Cost
Fair
Value
Within 1 year$— $— $11 $11 
After 1 year through 5 years— — 98 92 
After 5 years through 10 years— — 265 237 
After 10 years— — 1,207 1,072 
Subtotal— — 1,581 1,412 
Government agency issued MBS and CMO (a)1,258 1,092 7,375 6,663 
Total$1,258 $1,092 $8,956 $8,075 
(a)Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
Schedule of Investments within the Available for Sale Portfolio that had Unrealized Losses
The following tables provide information on investments within the available-for-sale portfolio that had unrealized losses as of March 31, 2025 and December 31, 2024:
AFS INVESTMENT SECURITIES WITH UNREALIZED LOSSES
 As of March 31, 2025
 Less than 12 months12 months or longerTotal
(Dollars in millions)Fair
Value
Unrealized
Losses
Fair
Value
Unrealized
Losses
Fair
Value
Unrealized
Losses
Government agency issued MBS$348 $(1)$2,996 $(435)$3,344 $(436)
Government agency issued CMO656 (1)1,722 (279)2,378 (280)
Other U.S. government agencies71 — 859 (129)930 (129)
States and municipalities 76 (1)242 (41)318 (42)
Total$1,151 $(3)$5,819 $(884)$6,970 $(887)
 
 As of December 31, 2024
 Less than 12 months12 months or longerTotal
(Dollars in millions)Fair
Value
Unrealized
Losses
Fair
Value
Unrealized
Losses
Fair
Value
Unrealized
Losses
Government agency issued MBS$663 $(9)$2,992 $(513)$3,655 $(522)
Government agency issued CMO675 (2)1,744 (310)2,419 (312)
Other U.S. government agencies210 (6)863 (155)1,073 (161)
States and municipalities 66 (1)256 (39)322 (40)
Total$1,614 $(18)$5,855 $(1,017)$7,469 $(1,035)