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Investment Securities (Tables)
3 Months Ended
Mar. 31, 2024
Marketable Securities [Abstract]  
Schedule of FHN's Investment Securities
The following tables summarize FHN’s investment securities as of March 31, 2024 and December 31, 2023:
INVESTMENT SECURITIES AT MARCH 31, 2024
 March 31, 2024
(Dollars in millions)Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair
Value
Securities available for sale:
Government agency issued MBS$4,972 $$(622)$4,351 
Government agency issued CMO2,435 — (350)2,085 
Other U.S. government agencies1,295 — (162)1,133 
States and municipalities624 (47)579 
Total securities available for sale (a)$9,326 $3 $(1,181)$8,148 
Securities held to maturity:
Government agency issued MBS$841 $— $(110)$731 
Government agency issued CMO470 — (70)400 
Total securities held to maturity$1,311 $ $(180)$1,131 
(a)Includes $8.3 billion of securities pledged to secure public deposits, securities sold under agreements to repurchase, and for other purposes.
INVESTMENT SECURITIES AT DECEMBER 31, 2023
 December 31, 2023
(Dollars in millions)Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair
Value
Securities available for sale:
Government agency issued MBS$5,061 $$(579)$4,484 
Government agency issued CMO2,487 — (341)2,146 
Other U.S. government agencies1,321 (151)1,172 
States and municipalities627 (41)589 
Total securities available for sale (a)$9,496 $$(1,112)$8,391 
Securities held to maturity:
Government agency issued MBS$852 $— $(96)$756 
Government agency issued CMO471 — (66)405 
Total securities held to maturity$1,323 $— $(162)$1,161 
(a)Includes $8.9 billion of securities 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, 2024 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$— $— $49 $48 
After 1 year through 5 years— — 129 120 
After 5 years through 10 years— — 372 339 
After 10 years— — 1,369 1,205 
Subtotal— — 1,919 1,712 
Government agency issued MBS and CMO (a)1,311 1,131 7,407 6,436 
Total$1,311 $1,131 $9,326 $8,148 
(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, 2024 and December 31, 2023:
AFS INVESTMENT SECURITIES WITH UNREALIZED LOSSES
 As of March 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$59 $(1)$4,224 $(621)$4,283 $(622)
Government agency issued CMO11 — 2,057 (350)2,068 (350)
Other U.S. government agencies216 (4)874 (158)1,090 (162)
States and municipalities 34 — 460 (47)494 (47)
Total$320 $(5)$7,615 $(1,176)$7,935 $(1,181)
 
 As of December 31, 2023
 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$140 $(2)$4,231 $(577)$4,371 $(579)
Government agency issued CMO32 — 2,098 (341)2,130 (341)
Other U.S. government agencies114 (2)905 (149)1,019 (151)
States and municipalities 14 — 465 (41)479 (41)
Total$300 $(4)$7,699 $(1,108)$7,999 $(1,112)