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Debt Securities
12 Months Ended
Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]  
Securities mortized 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:
 December 31, 2022
Recognized in OCI (1)
Not recognized in OCI
 Amortized
Cost
Gross Unrealized GainsGross Unrealized LossesCarrying ValueGross
Unrealized
Gains
Gross
Unrealized
Losses
Estimated
Fair
Value
 (In millions)
Debt securities held to maturity:
Mortgage-backed securities:
Residential agency$289 $— $(10)$279 $— $(21)$258 
Commercial agency523 — (1)522 — (29)493 
$812 $— $(11)$801 $— $(50)$751 
Debt securities available for sale:
U.S. Treasury securities$1,310 $— $(123)$1,187 $1,187 
Federal agency securities898 — (62)836 836 
Obligations of states and political subdivisions— — 
Mortgage-backed securities:
Residential agency19,477 — (2,523)16,954 16,954 
Residential non-agency— — 
Commercial agency8,262 — (649)7,613 7,613 
Commercial non-agency198 — (12)186 186 
Corporate and other debt securities1,219 (66)1,154 1,154 
$31,367 $$(3,435)$27,933 $27,933 
 
 December 31, 2021
Recognized in OCI (1)
Not recognized in OCI
 Amortized
Cost
Gross Unrealized GainsGross Unrealized LossesCarrying ValueGross
Unrealized
Gains
Gross
Unrealized
Losses
Estimated
Fair
Value
 (In millions)
Debt securities held to maturity:
Mortgage-backed securities:
Residential agency$370 $— $(13)$357 $20 $— $377 
Commercial agency543 — (1)542 31 — 573 
$913 $— $(14)$899 $51 $— $950 
Debt securities available for sale:
U.S. Treasury securities$1,137 $$(7)$1,132 $1,132 
Federal agency securities94 (3)92 92 
Obligations of states and political subdivisions— — 
Mortgage-backed securities:
Residential agency18,873 287 (198)18,962 18,962 
Residential non-agency— — 
Commercial agency6,271 163 (61)6,373 6,373 
Commercial non-agency532 — 536 536 
Corporate and other debt securities1,351 36 (6)1,381 1,381 
$28,263 $493 $(275)$28,481 $28,481 
_________
(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 $8.8 billion and $9.2 billion at December 31, 2022 and 2021, 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 December 31, 2022, 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
Cost
Estimated
Fair Value
 (In millions)
Debt securities held to maturity:
Mortgage-backed securities:
Residential agency$289 $258 
Commercial agency523 493 
$812 $751 
Debt securities available for sale:
Due in one year or less$165 $164 
Due after one year through five years2,276 2,134 
Due after five years through ten years841 753 
Due after ten years147 128 
Mortgage-backed securities:
Residential agency19,477 16,954 
Residential non-agency
Commercial agency8,262 7,613 
Commercial non-agency198 186 
$31,367 $27,933 
The following tables present gross unrealized losses and the related estimated fair value of debt securities held to maturity at December 31, 2022 and debt securities available for sale are presented at December 31, 2022 and 2021. 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; there were no unrealized losses on debt securities held to maturity using this analysis at December 31, 2021. All securities in an unrealized loss 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.
 December 31, 2022
 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$251 $(29)$$(1)$258 $(30)
Commercial agency469 (26)24 (4)493 (30)
$720 $(55)$31 $(5)$751 $(60)
Debt securities available for sale:
U.S Treasury securities$276 $(8)$903 $(115)$1,179 $(123)
Federal agency securities766 (50)53 (12)819 (62)
Mortgage-backed securities:
Residential agency9,350 (1,005)7,578 (1,518)16,928 (2,523)
Commercial agency6,110 (400)1,503 (249)7,613 (649)
Commercial non-agency141 (8)45 (4)186 (12)
Corporate and other debt securities736 (36)354 (30)1,090 (66)
$17,379 $(1,507)$10,436 $(1,928)$27,815 $(3,435)
 
 December 31, 2021
 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 available for sale:
U.S. Treasury securities$1,010 $(7)$— $— $1,010 $(7)
Federal agency securities63 (3)— — 63 (3)
Mortgage-backed securities:
Residential agency9,528 (171)686 (27)10,214 (198)
Commercial agency1,333 (29)760 (32)2,093 (61)
Corporate and other debt securities444 (6)— — 444 (6)
$12,378 $(216)$1,446 $(59)$13,824 $(275)
The number of individual debt positions in an unrealized loss position in the tables above increased from 479 at December 31, 2021 to 1,806 at December 31, 2022. The increase in the number of securities and the total amount of unrealized losses from year-end 2021 was primarily due to 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. 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 basis, which may be at maturity.
Gross realized gains and gross realized losses on sales of debt securities available for sale were immaterial for 2022. 2021 and 2020. The cost of securities sold is based on the specific identification method. As part of the Company's normal process for evaluating impairment, management did not identify any positions where impairment was believed to exist in 2022 or 2021 or 2020.