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SECURITIES
 3 Months Ended
Mar. 31, 2022
Investments, Debt and Equity Securities [Abstract]  
SECURITIES SECURITIES
The amortized cost and fair value of AFS debt securities are presented in the table below. There was no ACL in the AFS portfolio at March 31, 2022 and December 31, 2021. Accrued interest receivable on AFS debt securities totaled $6.9 million and $7.3 million at March 31, 2022 and December 31, 2021, 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:
March 31, 2022
U.S. Treasury$205 $— $(11)$194 
U.S. government agencies140 1 — 141 
U.S. government-sponsored entities214 — (10)204 
Residential mortgage-backed securities:
Agency mortgage-backed securities1,440 1 (54)1,387 
Agency collateralized mortgage obligations1,236 — (67)1,169 
Commercial mortgage-backed securities320 — (12)308 
States of the U.S. and political subdivisions (municipals)33 — (2)31 
Other debt securities12 — — 12 
Total debt securities AFS$3,600 $2 $(156)$3,446 
(in millions)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
 Value
Debt Securities AFS:
December 31, 2021
U.S. Treasury$205 $— $(1)$204 
U.S. government agencies154 1 — 155 
U.S. government-sponsored entities194 — (2)192 
Residential mortgage-backed securities:
Agency mortgage-backed securities1,342 19 (4)1,357 
Agency collateralized mortgage obligations1,192 11 (17)1,186 
Commercial mortgage-backed securities294 5 (2)297 
States of the U.S. and political subdivisions (municipals)33 — — 33 
Other debt securities2 — — 2 
Total debt securities AFS$3,416 $36 $(26)$3,426 
The amortized cost and fair value of HTM debt securities are presented in the table below. The ACL for the HTM municipal bond portfolio was $0.12 million and $0.05 million at March 31, 2022 and December 31, 2021, respectively. Accrued interest receivable on HTM debt securities totaled $11.1 million and $12.3 million at March 31, 2022 and December 31, 2021, 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:
March 31, 2022
U.S. Treasury$1 $— $— $1 
U.S. government agencies1 — — 1 
Residential mortgage-backed securities:
Agency mortgage-backed securities1,261 1 (53)1,209 
Agency collateralized mortgage obligations943 — (55)888 
Commercial mortgage-backed securities328 — (16)312 
States of the U.S. and political subdivisions (municipals)974 4 (30)948 
Other debt securities5 — — 5 
Total debt securities HTM$3,513 $5 $(154)$3,364 
(in millions)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
 Value
Debt Securities HTM:
December 31, 2021
U.S. Treasury$1 $— $— $1 
U.S. government agencies1 — — 1 
Residential mortgage-backed securities:
Agency mortgage-backed securities1,191 15 (5)1,201 
Agency collateralized mortgage obligations930 5 (12)923 
Commercial mortgage-backed securities323 3 (2)324 
States of the U.S. and political subdivisions (municipals)1,017 39 — 1,056 
Total debt securities HTM$3,463 $62 $(19)$3,506 
There were no significant gross gains or gross losses realized on securities during the three months ended March 31, 2022 or 2021.
As of March 31, 2022, 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$9 $9 $1 $1 
Due after one year but within five years434 412 23 23 
Due after five years but within ten years106 105 141 137 
Due after ten years55 56 816 794 
604 582 981 955 
Residential mortgage-backed securities:
Agency mortgage-backed securities1,440 1,387 1,261 1,209 
Agency collateralized mortgage obligations1,236 1,169 943 888 
Commercial mortgage-backed securities320 308 328 312 
Total debt securities$3,600 $3,446 $3,513 $3,364 
Actual maturities may differ from contractual terms because security issuers may have the right to call or prepay obligations with or without penalties. Periodic principal payments are received on residential mortgage-backed securities based on the payment patterns of the underlying collateral.
Following is information relating to securities pledged:
TABLE 4.4
(dollars in millions)March 31,
2022		December 31,
2021
Securities pledged (carrying value):
To secure public deposits, trust deposits and for other purposes as required by law$5,712 $5,660 
As collateral for short-term borrowings403 392 
Securities pledged as a percent of total securities87.9 %87.9 %
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 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
March 31, 2022
U.S. Treasury4 $194 $(11)— $— $— 4 $194 $(11)
U.S. government agencies6 50 — 9 7 — 15 57 — 
U.S. government-sponsored entities11 181 (8)1 23 (2)12 204 (10)
Residential mortgage-backed securities:
Agency mortgage-backed securities101 1,346 (54)— — — 101 1,346 (54)
Agency collateralized mortgage obligations60 952 (49)7 196 (18)67 1,148 (67)
Commercial mortgage-backed securities11 250 (10)2 31 (2)13 281 (12)
States of the U.S. and political subdivisions (municipals)12 27 (1)1 3 (1)13 30 (2)
Other debt securities5 6 — 1 2 — 6 8 — 
Total 210 $3,006 $(133)21 $262 $(23)231 $3,268 $(156)
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, 2021
U.S. Treasury3 $151 $(1)— $— $— 3 $151 $(1)
U.S. government agencies3 22 — 9 8 — 12 30 — 
U.S. government-sponsored entities3 99 (1)1 24 (1)4 123 (2)
Residential mortgage-backed securities:
Agency mortgage-backed securities13 599 (4)— — — 13 599 (4)
Agency collateralized mortgage obligations23 659 (15)3 68 (2)26 727 (17)
Commercial mortgage-backed securities5 125 (2)— — — 5 125 (2)
States of the U.S. and political subdivisions10 24 — — — — 10 24 — 
Other debt securities— — — 1 2 — 1 2 — 
Total60 $1,679 $(23)14 $102 $(3)74 $1,781 $(26)
We evaluated the AFS debt securities that were in an unrealized loss position at March 31, 2022. Based on the credit ratings and implied government guarantee for these securities, we concluded the loss position is temporary and caused by the movement of interest rates and does not reflect any expected credit losses. We do not intend to sell the AFS debt securities and it is not more likely than not that we will be required to sell the securities before the recovery of their amortized cost basis.
Credit Quality Indicators
We use credit ratings and the most recent financial information to help evaluate the credit quality of our credit-related AFS and HTM securities portfolios. Management reviews the credit profile of each issuer on an annual basis, and more frequently as needed. Based on the nature of the issuers and current conditions, we have determined that securities backed by the UST, Fannie Mae, Freddie Mac, FHLB, Ginnie Mae, and the SBA have zero expected credit loss.
Our municipal bond portfolio, with a carrying amount of $1.0 billion as of March 31, 2022 is highly rated with an average rating of AA and 100% of the portfolio having an A or better rating. All of the securities in the municipal portfolio are general obligation bonds. Geographically, municipal bonds support our primary footprint as 61% of the securities are from municipalities located in the primary states within which we conduct business. The average holding size of the securities in the municipal bond portfolio is $3.5 million. In addition to the strong stand-alone ratings, 60% of the municipal bonds have some formal credit enhancement (e.g., insurance) that strengthens the creditworthiness of the bond.
The ACL on the HTM municipal bond portfolio is calculated on each bond using:
•The bond’s underlying credit rating, time to maturity and exposure amount;
•Credit enhancements that improve the bond’s credit rating (e.g., insurance); and
•Moody’s U.S. Bond Defaults and Recoveries, 1970-2020 study.
By using these components, we derive the expected credit loss on the HTM general obligation municipal bond portfolio. We further refine the expected credit loss by factoring in economic forecast data using our Commercial and Industrial Non-Manufacturing loan portfolio forecast adjustment as derived through our assessment of the loan portfolio as a proxy for our municipal bond portfolio.
Our corporate bond portfolio, with a carrying amount of $16.9 million as of March 31, 2022 primarily consists of subordinated debentures of banks within our footprint. The average holding size of the securities in the corporate bond portfolio is $1.7 million.
The ACL on the HTM corporate bond portfolio is calculated using:
•The bond’s credit rating, time to maturity and exposure amount;
•Moody’s Annual Default Study, 02/08/2022; and
•Most recent financial statements.
By using these components, we derive the expected credit loss on the HTM corporate bond portfolio. We further refine the expected credit loss by factoring in economic forecast data using our bank-wide loan portfolio forecast adjustment as derived through our assessment of the Bank's loan portfolio as a proxy for our corporate bond portfolio.
For the year-to-date periods ending March 31, 2022 and 2021, we had no significant provision expense and no charge-offs or recoveries. The ACL on the HTM portfolio was $0.12 million and $0.05 million as of March 31, 2022 and December 31, 2021, respectively. No other securities portfolios had an ACL. At March 31, 2022 and December 31, 2021, there were no securities that were past due or on non-accrual.