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Investment Securities (Tables)
12 Months Ended
Dec. 31, 2021
Marketable Securities [Abstract]  
Schedule of FHN's Investment Securities
The following tables summarize FHN’s investment securities as of December 31, 2021 and 2020:
Table 8.3.1a
INVESTMENT SECURITIES AT YE 2021
 December 31, 2021
(Dollars in millions)Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair
Value
Securities available for sale:
Government agency issued MBS$5,062 $42 $(49)$5,055 
Government agency issued CMO2,296 (47)2,257 
Other U.S. government agencies861 (15)850 
States and municipalities535 11 (1)545 
Total securities available for sale (a)$8,754 $65 $(112)$8,707 
Securities held to maturity:
Government agency issued MBS$509 $— $(5)$504 
Government agency issued CMO203 — (2)201 
Total securities held to maturity$712 $ $(7)$705 
(a)Includes $6.5 billion of securities pledged to secure public deposits, securities sold under agreements to repurchase, and for other purposes.

Table 8.3.1b
INVESTMENT SECURITIES AT YE 2020
 December 31, 2020
(Dollars in millions)Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair
Value
Securities available for sale:
U.S. treasuries$613 $— $— $613 
Government agency issued MBS3,722 92 (2)3,812 
Government agency issued CMO2,380 29 (3)2,406 
Other U.S. government agencies672 12 — 684 
Corporate and other debt40 (1)40 
States and municipalities445 15 — 460 
$7,872 $149 $(6)8,015 
AFS securities recorded at fair value through earnings:
SBA interest-only strips (a)32 
Total securities available for sale (b)$8,047 
Securities held to maturity:
Corporate and other debt$10 $— $— $10 
Total securities held to maturity $10 $— $— $10 
(a)SBA interest-only strips were recorded at elected fair value. See Note 24 - Fair Value of Assets and Liabilities for additional information.
(b)Includes $6.4 billion of securities pledged to secure public deposits, securities sold under agreements to repurchase, and for other purposes.
Schedule of Amortized Cost And Fair Value By Contractual Maturity
The amortized cost and fair value by contractual maturity for the debt securities portfolio as of December 31, 2021 is provided below:
Table 8.3.2
DEBT SECURITIES PORTFOLIO MATURITIES 
 Held to MaturityAvailable for Sale
(Dollars in millions)Amortized
Cost
Fair
Value
Amortized
Cost
Fair
Value
Within 1 year$— $— $17 $18 
After 1 year through 5 years— — 149 149 
After 5 years through 10 years— — 351 349 
After 10 years— — 879 879 
Subtotal— — 1,396 1,395 
Government agency issued MBS and CMO (a)712 705 7,358 7,312 
Total$712 $705 $8,754 $8,707 
(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 December 31, 2021 and 2020:
Table 8.3.3a
AFS INVESTMENT SECURITIES WITH UNREALIZED LOSSES AT YE 2021 
 As of December 31, 2021
 Less than 12 months12 months or longerTotal
(Dollars in millions)Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
Government agency issued MBS$2,973 $(41)$184 $(8)$3,157 $(49)
Government agency issued CMO1,436 (37)248 (10)1,684 (47)
Other U.S. government agencies459 (11)90 (4)549 (15)
States and municipalities68 (1)— — 68 (1)
Total$4,936 $(90)$522 $(22)$5,458 $(112)
Table 8.3.3b
AFS INVESTMENT SECURITIES WITH UNREALIZED LOSSES AT YE 2020 
 As of December 31, 2020
 Less than 12 months12 months or longerTotal
(Dollars in millions)Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
U.S. treasuries$307 $— $— $— $307 $— 
Government agency issued MBS426 (2)— — 426 (2)
Government agency issued CMO586 (3)— — 586 (3)
Other U.S. government agencies80 (1)— — 80 (1)
States and municipalities — — — — 
Total$1,400 $(6)$— $— $1,400 $(6)