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Investment Securities (Tables)
6 Months Ended
Jun. 30, 2023
Marketable Securities [Abstract]  
Schedule of FHN's Investment Securities
The following tables summarize FHN’s investment securities as of June 30, 2023 and December 31, 2022:
INVESTMENT SECURITIES AT JUNE 30, 2023
 June 30, 2023
(Dollars in millions)Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair
Value
Securities available for sale:
Government agency issued MBS$5,287 $— $(684)$4,603 
Government agency issued CMO2,585 — (375)2,210 
Other U.S. government agencies1,359 (165)1,195 
States and municipalities645 (54)592 
Total securities available for sale (a)$9,876 $2 $(1,278)$8,600 
Securities held to maturity:
Government agency issued MBS$877 $— $(108)$769 
Government agency issued CMO472 — (66)406 
Total securities held to maturity$1,349 $ $(174)$1,175 
(a)Includes $8.7 billion of securities pledged to secure public deposits, securities sold under agreements to repurchase, and for other purposes.
INVESTMENT SECURITIES AT YE 2022
 December 31, 2022
(Dollars in millions)Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair
Value
Securities available for sale:
Government agency issued MBS$5,457 $$(695)$4,763 
Government agency issued CMO2,682 — (369)2,313 
Other U.S. government agencies1,325 — (162)1,163 
States and municipalities658 (62)597 
Total securities available for sale (a)$10,122 $$(1,288)$8,836 
Securities held to maturity:
Government agency issued MBS$897 $— $(109)$788 
Government agency issued CMO474 — (53)421 
Total securities held to maturity$1,371 $— $(162)$1,209 
(a)Includes $6.5 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 June 30, 2023 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$— $— $14 $14 
After 1 year through 5 years— — 125 119 
After 5 years through 10 years— — 399 358 
After 10 years— — 1,466 1,296 
Subtotal— — 2,004 1,787 
Government agency issued MBS and CMO (a)1,349 1,175 7,872 6,813 
Total$1,349 $1,175 $9,876 $8,600 
(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 June 30, 2023 and December 31, 2022:
AFS INVESTMENT SECURITIES WITH UNREALIZED LOSSES
 As of June 30, 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$690 $(29)$3,911 $(655)$4,601 $(684)
Government agency issued CMO166 (9)2,045 (366)2,211 (375)
Other U.S. government agencies326 (15)714 (150)1,040 (165)
States and municipalities 53 — 475 (54)528 (54)
Total$1,235 $(53)$7,145 $(1,225)$8,380 $(1,278)
 
 As of December 31, 2022
 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$2,314 $(249)$2,350 $(446)$4,664 $(695)
Government agency issued CMO1,104 (123)1,209 (246)2,313 (369)
Other U.S. government agencies643 (67)424 (95)1,067 (162)
States and municipalities 493 (48)54 (14)547 (62)
Total$4,554 $(487)$4,037 $(801)$8,591 $(1,288)