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Debt Securities
6 Months Ended
Jun. 30, 2024
Investments, Debt and Equity Securities [Abstract]  
Securities
NOTE 3. DEBT SECURITIES
The amortized cost, gross unrealized gains and losses, and estimated fair value of debt securities held to maturity and debt securities available for sale are as follows:
 June 30, 2024
Recognized in OCI (1)
Not recognized in OCI
 Amortized
Cost
Gross Unrealized GainsGross Unrealized LossesCarrying ValueGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
 (In millions)
Debt securities held to maturity:
Mortgage-backed securities:
Residential agency$228 $— $(8)$220 $— $(20)$200 
Commercial agency513 — — 513 — (23)490 
$741 $— $(8)$733 $— $(43)$690 
Debt securities available for sale:
U.S. Treasury securities$1,486 $$(97)$1,390 $1,390 
Federal agency securities530 (20)512 512 
Obligations of states and political subdivisions— — 
Mortgage-backed securities:
Residential agency22,263 21 (2,452)19,832 19,832 
Commercial agency6,289 (490)5,800 5,800 
Commercial non-agency92 — (11)81 81 
Corporate and other debt securities950 (32)920 920 
$31,612 $27 $(3,102)$28,537 $28,537 
 
 
December 31, 2023
Recognized in OCI (1)
Not recognized in OCI
 Amortized
Cost
Gross Unrealized GainsGross Unrealized LossesCarrying ValueGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
 (In millions)
Debt securities held to maturity:
Mortgage-backed securities:
Residential agency$247 $— $(8)$239 $— $(16)$223 
Commercial agency516 — (1)515 — (22)493 
$763 $— $(9)$754 $— $(38)$716 
Debt securities available for sale:
U.S. Treasury securities$1,322 $— $(99)$1,223 $1,223 
Federal agency securities1,085 (46)1,043 1,043 
Obligations of states and political subdivisions— — 
Mortgage-backed securities:
Residential agency19,450 52 (2,130)17,372 17,372 
Commercial agency7,807 (502)7,307 7,307 
Commercial non-agency93 — (10)83 83 
Corporate and other debt securities1,105 (35)1,074 1,074 
$30,864 $62 $(2,822)$28,104 $28,104 
_________
(1)The gross unrealized losses recognized in OCI on securities held to maturity resulted from a transfer of securities available for sale to held to maturity in the second quarter of 2013.
Debt securities with carrying values of $18.1 billion and $24.0 billion at June 30, 2024 and December 31, 2023, respectively, were pledged to secure public funds, trust deposits and other borrowing arrangements.
The amortized cost and estimated fair value of debt securities held to maturity and debt securities available for sale at June 30, 2024, by contractual maturity, are shown below. 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.
Amortized CostEstimated Fair Value
 (In millions)
Debt securities held to maturity:
Mortgage-backed securities:
Residential agency$228 $200 
Commercial agency513 490 
$741 $690 
Debt securities available for sale:
Due in one year or less$329 $323 
Due after one year through five years2,051 1,938 
Due after five years through ten years438 429 
Due after ten years150 134 
Mortgage-backed securities:
Residential agency22,263 19,832 
Commercial agency6,289 5,800 
Commercial non-agency92 81 
$31,612 $28,537 
The following tables present gross unrealized losses and the related estimated fair value of debt securities held to maturity and debt securities available for sale at June 30, 2024 and December 31, 2023. For debt securities transferred to held to maturity from available for sale, the analysis in the tables below compares the securities' original amortized cost to its current estimated fair value. All securities in an unrealized position are segregated between investments that have been in a continuous unrealized loss position for less than twelve months and for twelve months or more.
 June 30, 2024
 Less Than Twelve MonthsTwelve Months or MoreTotal
 Estimated
Fair
Value
Gross
Unrealized
Losses
Estimated
Fair
Value
Gross
Unrealized
Losses
Estimated
Fair
Value
Gross
Unrealized
Losses
 (In millions)
Debt securities held to maturity:
Mortgage-backed securities:
Residential agency$— $— $200 $(27)$200 $(27)
Commercial agency— — 490 (24)490 (24)
$— $— $690 $(51)$690 $(51)
Debt securities available for sale:
U.S Treasury securities$137 $— $1,095 $(97)$1,232 $(97)
Federal agency securities117 (1)296 (19)413 (20)
Mortgage-backed securities:
Residential agency3,703 (46)14,133 (2,406)17,836 (2,452)
Commercial agency139 (2)5,632 (488)5,771 (490)
Commercial non-agency— — 81 (11)81 (11)
Corporate and other debt securities105 (1)689 (31)794 (32)
$4,201 $(50)$21,926 $(3,052)$26,127 $(3,102)
 
 December 31, 2023
 Less Than Twelve MonthsTwelve Months or MoreTotal
 Estimated
Fair
Value
Gross
Unrealized
Losses
Estimated
Fair
Value
Gross
Unrealized
Losses
Estimated
Fair
Value
Gross
Unrealized
Losses
 (In millions)
Debt securities held to maturity:
Mortgage-backed securities:
Residential agency$— $— $223 $(23)$223 $(23)
Commercial agency— — 493 (23)493 (23)
$— $— $716 $(46)$716 $(46)
Debt securities available for sale:
U.S. Treasury securities$$— $1,201 $(99)$1,207 $(99)
Federal agency securities237 (5)666 (41)903 (46)
Mortgage-backed securities:
Residential agency241 (3)15,144 (2,127)15,385 (2,130)
Commercial agency612 (7)6,583 (495)7,195 (502)
Commercial non-agency— — 82 (10)82 (10)
Corporate and other debt securities23 — 879 (35)902 (35)
$1,119 $(15)$24,555 $(2,807)$25,674 $(2,822)
The number of individual debt positions in an unrealized loss position in the tables above increased to 1,752 at June 30, 2024 from 1,703 at December 31, 2023. The increase in the total amount of unrealized losses was impacted by changes in market interest rates. In instances where an unrealized loss existed, there was no indication of an adverse change in credit on the underlying positions in the tables above. As it relates to these positions, management believes no individual unrealized loss represented credit impairment as of those dates. At June 30, 2024, the Company does not intend to sell, and it is not more likely than not that the Company will be required to sell, the positions before the recovery of their amortized cost bases, which may be at maturity.
Gross realized losses on sales of debt securities available for sale for the three and six months ended June 30, 2024 totaled $50 million and $100 million, respectively, and gross realized gains for both the three and six months ended June 30, 2024 were zero. Gross realized gains and losses on sales of debt securities were immaterial for three and six months ended June 30, 2023. The cost of securities sold is based on the specific identification method. As part of the Company's normal process for evaluating impairment, including credit-related impairment, impairment identified by management was immaterial for the three and six months ended June 30, 2024 and 2023.