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Investment Securities (Tables)
9 Months Ended
Sep. 30, 2020
Marketable Securities [Abstract]  
Schedule of FHN's Investment Securities
The following tables summarize FHN’s investment securities on September 30, 2020 and December 31, 2019:
 September 30, 2020
(Dollars in thousands)Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair
Value
Securities available for sale:
U.S. treasuries$300,037 $— $(3)$300,034 
Government agency issued mortgage-backed securities (“MBS”)3,731,490 97,734 (2,158)3,827,066 
Government agency issued collateralized mortgage obligations (“CMO”)2,675,192 31,694 (1,439)2,705,447 
Other U.S. government agencies644,328 13,942 (4)658,266 
Corporates and other debt39,936 74 — 40,010 
States and municipalities421,754 10,342 (6)432,090 
$7,812,737 $153,786 $(3,610)7,962,913 
AFS debt securities recorded at fair value through earnings:
SBA-interest only strips (a)32,959 
Total securities available for sale (b)$7,995,872 
 
(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 $5.7 billion of securities pledged to secure public deposits, securities sold under agreements to repurchase, and for other purposes.
 December 31, 2019
(Dollars in thousands)Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair
Value
Securities available for sale:
U.S. treasuries$100 $— $— $100 
Government agency issued MBS2,316,381 34,692 (2,556)2,348,517 
Government agency issued CMO1,667,773 9,916 (7,197)1,670,492 
Other U.S. government agencies303,463 3,750 (1,121)306,092 
Corporates and other debt40,054 486 — 40,540 
States and municipalities57,232 3,324 (30)60,526 
$4,385,003 $52,168 $(10,904)4,426,267 
AFS debt securities recorded at fair value through earnings:
SBA-interest only strips (a)19,136 
Total securities available for sale (b)$4,445,403 
 
(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 $3.8 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 portfolios on September 30, 2020 are provided below:
 Available-for-Sale
(Dollars in thousands)Amortized
Cost
Fair
Value
Within 1 year$453,324 $455,069 
After 1 year; within 5 years192,172 196,096 
After 5 years; within 10 years152,870 160,078 
After 10 years607,689 619,157 
Subtotal1,406,055 1,430,400 
Government agency issued MBS and CMO (a)6,406,682 6,532,513 
Total$7,812,737 $7,962,913 
 
(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 Gross Gains And Losses On Sale From Available For Sale Portfolio
The table below provides information on gross gains and gross losses from debt investment securities for the three and nine months ended September 30, 2020 and 2019.
 
 Three Months Ended
September 30,
Nine Months Ended
September 30,
(Dollars in thousands)2020201920202019
Gross gains on sales of debt securities$1,442 $— $1,442 $— 
Gross (losses) on sales of debt securities(2,765)— (2,765)(267)
Net gains (losses) on sales of debt securities (a)$(1,323)$— $(1,323)$(267)
 
(a)Cash proceeds for the three and nine months ended September 30, 2020 were not material. Cash proceeds for the three months ended September 30, 2019, were not material. Cash proceeds for the nine months ended September 30, 2019 were $182.8 million.
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 September 30, 2020 and December 31, 2019:

 As of September 30, 2020
 Less than 12 months12 months or longerTotal
(Dollars in thousands)Fair
Value
Unrealized
Losses
Fair
Value
Unrealized
Losses
Fair
Value
Unrealized
Losses
U.S. treasuries$299,934 $(3)$— $— $299,934 $(3)
Government agency issued MBS568,733 (2,158)— — 568,733 (2,158)
Government agency issued CMO636,386 (1,439)— — 636,386 (1,439)
Other U.S. government agencies30,896 (4)$— $— 30,896 (4)
States and municipalities 5,191 (6)— — 5,191 (6)
Total temporarily impaired securities$1,541,140 $(3,610)$ $ $1,541,140 $(3,610)
 
 As of December 31, 2019
 Less than 12 months12 months or longerTotal
(Dollars in thousands)Fair
Value
Unrealized
Losses
Fair
Value
Unrealized
Losses
Fair
Value
Unrealized
Losses
U.S. treasuries$— $— $100 $— $100 $— 
Government agency issued MBS174,983 (495)192,755 (2,061)367,738 (2,556)
Government agency issued CMO378,815 (1,970)361,124 (5,227)739,939 (7,197)
Other U.S. government agencies98,471 (1,121)— — 98,471 (1,121)
States and municipalities 3,551 (30)— — 3,551 (30)
Total temporarily impaired securities$655,820 $(3,616)$553,979 $(7,288)$1,209,799 $(10,904)