Investment Securities (Tables)

6 Months Ended

Jun. 30, 2021

Marketable Securities [Abstract]

Schedule of FHN's Investment Securities

The following tables summarize FHN’s investment securities on June 30, 2021 and December 31, 2020:

	June 30, 2021
(Dollars in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Securities available for sale:
U.S. treasuries	$	607	$	—	$	—	$	607
Government agency issued MBS	4,120		66		(19)		4,167
Government agency issued CMO	2,330		18		(25)		2,323
Other U.S. government agencies	737		10		(4)		743
States and municipalities	506		12		—		518
	$	8,300	$	106	$	(48)	8,358
AFS securities recorded at fair value through earnings:
SBA-interest only strips (a)							30
Total securities available for sale (b)							$	8,388

(a)SBA-interest only strips are recorded at elected fair value. See Note 17 - Fair Value of Assets and Liabilities for additional information.

(b)Includes $7.1 billion of securities pledged to secure public deposits, securities sold under agreements to repurchase, and for other purposes.

	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 MBS	3,722		92		(2)		3,812
Government agency issued CMO	2,380		29		(3)		2,406
Other U.S. government agencies	672		12		—		684
Corporate and other debt	40		1		(1)		40
States and municipalities	445		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

(a)SBA-interest only strips are recorded at elected fair value. See Note 17 - 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 available-for-sale debt securities portfolio on June 30, 2021 is provided below:

	Available for Sale
(Dollars in millions)	Amortized Cost		Fair Value
Within 1 year	$	680	$	681
After 1 year through 5 years	148		150
After 5 years through 10 years	346		355
After 10 years	676		712
Subtotal	1,850		1,898
Government agency issued MBS and CMO (a)	6,450		6,490
Total	$	8,300	$	8,388

(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, 2021 and December 31, 2020:

	As of June 30, 2021
	Less than 12 months				12 months or longer				Total
(Dollars in millions)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Government agency issued MBS	$	1,618	$	(19)	$	—	$	—	$	1,618	$	(19)
Government agency issued CMO	1,332		(25)		—		—		1,332		(25)
Other U.S. government agencies	281		(4)		—		—		281		(4)
States and municipalities	41		—		—		—		41		—
Total	$	3,272	$	(48)	$	—	$	—	$	3,272	$	(48)

	As of December 31, 2020
	Less than 12 months				12 months or longer				Total
(Dollars in millions)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
U.S. treasuries	$	307	$	—	$	—	$	—	$	307	$	—
Government agency issued MBS	426		(2)		—		—		426		(2)
Government agency issued CMO	586		(3)		—		—		586		(3)
Other U.S. government agencies	80		(1)		—		—		80		(1)
States and municipalities	1		—		—		—		1		—
Total	$	1,400	$	(6)	$	—	$	—	$	1,400	$	(6)