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SECURITIES (Tables)
 12 Months Ended
Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]  
Schedule of Amortized Cost and Fair Value of Securities Available for Sale
The amortized cost and fair value of AFS debt securities are presented in the table below. There was no ACL associated with the AFS portfolio at December 31, 2023 and December 31, 2022. Accrued interest receivable on AFS debt securities totaled $9.6 million and $8.9 million at December 31, 2023 and 2022, respectively, and is excluded from the estimate of credit losses and assessed separately in other assets in the Consolidated Balance Sheets. Accordingly, we have excluded accrued interest receivable from both the fair value and the amortized cost basis of AFS debt securities.
TABLE 4.1
(in millions)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
Debt Securities AFS:
December 31, 2023
U.S. Treasury$422 $— $(2)$420 
U.S. government agencies78 1 — 79 
U.S. government-sponsored entities227 — (4)223 
Residential mortgage-backed securities:
Agency mortgage-backed securities814 — (62)752 
Agency collateralized mortgage obligations946 — (114)832 
Commercial mortgage-backed securities905 9 (30)884 
States of the U.S. and political subdivisions (municipals)30 — (3)27 
Other debt securities38 — (1)37 
Total debt securities AFS$3,460 $10 $(216)$3,254 
(in millions)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
 Value
Debt Securities AFS:
December 31, 2022
U.S. Treasury$278 $— $(21)$257 
U.S. government agencies107 1 — 108 
U.S. government-sponsored entities283 — (21)262 
Residential mortgage-backed securities:
Agency mortgage-backed securities1,360 — (128)1,232 
Agency collateralized mortgage obligations1,110 — (138)972 
Commercial mortgage-backed securities430 — (35)395 
States of the U.S. and political subdivisions (municipals)33 — (4)29 
Other debt securities21 — (1)20 
Total debt securities AFS$3,622 $1 $(348)$3,275 
Schedule of Amortized Cost and Fair Value of Securities Held to Maturity
The amortized cost and fair value of HTM debt securities are presented in the following table. The ACL for the HTM portfolio was $0.28 million and $0.23 million at December 31, 2023 and 2022, respectively. Accrued interest receivable on HTM debt securities totaled $14.7 million and $14.0 million at December 31, 2023 and 2022, respectively, and is excluded from the estimate of credit losses and assessed separately in other assets in the Consolidated Balance Sheets. Accordingly, we have excluded accrued interest receivable from both the fair value and the amortized cost basis of HTM debt securities.
TABLE 4.2
(in millions)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
 Value
Debt Securities HTM:
December 31, 2023
U.S. government agencies$1 $— $— $1 
U.S. government-sponsored entities68 — — 68 
Residential mortgage-backed securities:
Agency mortgage-backed securities1,057 2 (101)958 
Agency collateralized mortgage obligations824 — (104)720 
Commercial mortgage-backed securities929 4 (43)890 
States of the U.S. and political subdivisions (municipals)1,017 2 (77)942 
Other debt securities15 — (1)14 
Total debt securities HTM$3,911 $8 $(326)$3,593 
(in millions)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
 Value
Debt Securities HTM:
December 31, 2022
U.S. government agencies$1 $— $— $1 
U.S. government-sponsored entities52 — — 52 
Residential mortgage-backed securities:
Agency mortgage-backed securities1,178 — (125)1,053 
Agency collateralized mortgage obligations953 — (120)833 
Commercial mortgage-backed securities866 2 (50)818 
States of the U.S. and political subdivisions (municipals)1,025 1 (107)919 
Other debt securities12 — (1)11 
Total debt securities HTM$4,087 $3 $(403)$3,687 
Schedule of Amortized Cost and Fair Value of Securities, by Contractual Maturities
As of December 31, 2023, the amortized cost and fair value of debt securities, by contractual maturities, were as follows:
TABLE 4.3
Available for SaleHeld to Maturity
(in millions)Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
Due in one year or less$357 $358 $2 $2 
Due after one year but within five years363 355 125 122 
Due after five years but within ten years41 40 217 206 
Due after ten years34 33 757 695 
795 786 1,101 1,025 
Residential mortgage-backed securities:
Agency mortgage-backed securities814 752 1,057 958 
Agency collateralized mortgage obligations946 832 824 720 
Commercial mortgage-backed securities905 884 929 890 
Total debt securities$3,460 $3,254 $3,911 $3,593 
Schedule of Securities Pledged as Collateral
Following is information relating to securities pledged:
TABLE 4.4
December 3120232022
(dollars in millions)
Securities pledged (carrying value):
To secure public deposits, trust deposits and for other purposes as required by law$6,190 $6,403 
As collateral for short-term borrowings250 348 
Securities pledged as a percent of total securities89.9 %91.7 %
Schedule of Fair Values and Unrealized Losses of Impaired Securities, Segregated by Length of Impairment
Following are summaries of the fair values of AFS debt securities in an unrealized loss position for which an ACL has not been recorded, segregated by security type and length of time in a continuous loss position:
TABLE 4.5
Less than 12 Months12 Months or MoreTotal
(dollars in millions)#Fair
Value		Unrealized
Losses		#Fair
Value		Unrealized
Losses		#Fair
Value		Unrealized
Losses
Debt Securities AFS
December 31, 2023
U.S. Treasury— $— $— 2 $73 $(2)2 $73 $(2)
U.S. government agencies2 4 — 12 36 — 14 40 — 
U.S. government-sponsored entities1 25 — 7 123 (4)8 148 (4)
Residential mortgage-backed securities:
Agency mortgage-backed securities— — — 104 750 (62)104 750 (62)
Agency collateralized mortgage obligations— — — 71 832 (114)71 832 (114)
Commercial mortgage-backed securities1 32 — 20 377 (30)21 409 (30)
States of the U.S. and political subdivisions (municipals)— — — 13 27 (3)13 27 (3)
Other debt securities2 9 — 7 17 (1)9 26 (1)
Total 6 $70 $— 236 $2,235 $(216)242 $2,305 $(216)
Less than 12 Months12 Months or MoreTotal
(dollars in millions)#Fair
 Value		Unrealized
Losses		#Fair
 Value		Unrealized
Losses		#Fair
 Value		Unrealized
Losses
Debt Securities AFS
December 31, 2022
U.S. Treasury3 $120 $(7)3 $137 $(14)6 $257 $(21)
U.S. government agencies6 46 — 8 4 — 14 50 — 
U.S. government-sponsored entities9 150 (8)4 112 (13)13 262 (21)
Residential mortgage-backed securities:
Agency mortgage-backed securities104 773 (58)13 455 (70)117 1,228 (128)
Agency collateralized mortgage obligations49 455 (42)23 517 (96)72 972 (138)
Commercial mortgage-backed securities16 302 (21)5 94 (14)21 396 (35)
States of the U.S. and political subdivisions (municipals)4 7 (1)10 22 (3)14 29 (4)
Other debt securities7 15 (1)1 2 — 8 17 (1)
Total198 $1,868 $(138)67 $1,343 $(210)265 $3,211 $(348)