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Investment Securities (Tables)
6 Months Ended
Jun. 30, 2022
Marketable Securities [Abstract]  
Schedule of FHN's Investment Securities
The following tables summarize FHN’s investment securities as of June 30, 2022 and December 31, 2021:
INVESTMENT SECURITIES AT JUNE 30, 2022
 June 30, 2022
(Dollars in millions)Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair
Value
Securities available for sale:
Government agency issued MBS$5,268 $$(491)$4,779 
Government agency issued CMO2,867 — (241)2,626 
Other U.S. government agencies1,071 (98)974 
States and municipalities623 — (61)562 
Total securities available for sale (a)$9,829 $3 $(891)$8,941 
Securities held to maturity:
Government agency issued MBS486 — (62)424 
Government agency issued CMO201 — (24)177 
Total securities held to maturity$687 $ $(86)$601 
(a)Includes $6.5 billion of securities pledged to secure public deposits, securities sold under agreements to repurchase, and for other purposes.
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 $6.5 billion of securities pledged to secure public deposits, securities sold under agreements to repurchase, and for other purposes.
Schedule of Amortized Cost And Fair Value By Contractual Maturity
The amortized cost and fair value by contractual maturity for the debt securities portfolio as of June 30, 2022 is provided below:
DEBT SECURITIES PORTFOLIO MATURITIES
 Held to MaturityAvailable for Sale
(Dollars in millions)Amortized
Cost
Fair
Value
Amortized
Cost
Fair
Value
Within 1 year$— $— $50 $50 
After 1 year through 5 years— — 122 117 
After 5 years through 10 years— — 347 319 
After 10 years— — 1,176 1,050 
Subtotal— — 1,695 1,536 
Government agency issued MBS and CMO (a)687 601 8,135 7,405 
Total$687 $601 $9,830 $8,941 
(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, 2022 and December 31, 2021:
AFS INVESTMENT SECURITIES WITH UNREALIZED LOSSES
 As of June 30, 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$3,887 $(362)$787 $(129)$4,674 $(491)
Government agency issued CMO1,695 (115)819 (126)2,514 (241)
Other U.S. government agencies664 (65)203 (33)867 (98)
States and municipalities 510 (59)(2)517 (61)
Total$6,756 $(601)$1,816 $(290)$8,572 $(891)
 
 As of December 31, 2021
 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$2,973 $(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 municipalities 68 (1)— — 68 (1)
Total$4,936 $(90)$522 $(22)$5,458 $(112)