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Securities
 3 Months Ended
Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract]  
Securities Securities
The following tables present the amortized cost, gross unrealized gains and losses and fair value by major categories of AFS and HTM debt securities as of March 31, 2024 and December 31, 2023:
March 31, 2024
($ in thousands)
Amortized Cost (1)
Gross Unrealized GainsGross Unrealized LossesFair Value
AFS debt securities:
U.S. Treasury securities$676,290 $— $(55,196)$621,094 
U.S. government agency and U.S. government-sponsored enterprise debt securities410,676 — (49,874)360,802 
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities (2):
Commercial mortgage-backed securities513,159 129 (57,669)455,619 
Residential mortgage-backed securities5,229,549 4,212 (241,362)4,992,399 
Municipal securities296,360 47 (37,912)258,495 
Non-agency mortgage-backed securities:
Commercial mortgage-backed securities373,834 — (39,838)333,996 
Residential mortgage-backed securities609,705 — (90,048)519,657 
Corporate debt securities653,501 — (150,854)502,647 
Foreign government bonds238,592 605 (12,001)227,196 
Asset-backed securities41,287 — (575)40,712 
CLOs89,000 — (1,149)87,851 
Total AFS debt securities9,131,953 4,993 (736,478)8,400,468 
HTM debt securities:
U.S. Treasury securities530,921 — (45,521)485,400 
U.S. government agency and U.S. government-sponsored enterprise debt securities1,002,697 — (196,898)805,799 
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities (3):
Commercial mortgage-backed securities491,842 — (93,850)397,992 
Residential mortgage-backed securities734,577 — (153,299)581,278 
Municipal securities188,605 — (44,596)144,009 
Total HTM debt securities2,948,642 — (534,164)2,414,478 
Total debt securities$12,080,595 $4,993 $(1,270,642)$10,814,946 
December 31, 2023
($ in thousands)
Amortized Cost (1)
Gross Unrealized GainsGross Unrealized LossesFair Value
AFS debt securities:
U.S. Treasury securities$1,112,587 $101 $(52,313)$1,060,375 
U.S. government agency and U.S. government-sponsored enterprise debt securities412,086 — (47,640)364,446 
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities (2):
Commercial mortgage-backed securities531,377 158 (63,276)468,259 
Residential mortgage-backed securities1,956,927 380 (229,713)1,727,594 
Municipal securities297,283 75 (36,342)261,016 
Non-agency mortgage-backed securities:
Commercial mortgage-backed securities409,578 — (42,062)367,516 
Residential mortgage-backed securities643,335 — (89,664)553,671 
Corporate debt securities653,501 — (151,076)502,425 
Foreign government bonds239,333 69 (11,528)227,874 
Asset-backed securities43,234 — (934)42,300 
CLOs617,250 — (4,389)612,861 
Total AFS debt securities 6,916,491 783 (728,937)6,188,337 
HTM debt securities:
U.S. Treasury securities529,548 — (40,997)488,551 
U.S. government agency and U.S. government-sponsored enterprise debt securities1,001,836 — (186,904)814,932 
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities (3):
Commercial mortgage-backed securities493,348 — (88,968)404,380 
Residential mortgage-backed securities742,436 — (142,119)600,317 
Municipal securities188,872 — (43,081)145,791 
Total HTM debt securities2,956,040 — (502,069)2,453,971 
Total debt securities$9,872,531 $783 $(1,231,006)$8,642,308 
(1)Amortized cost excludes accrued interest receivables which are presented within Other assets on the Consolidated Balance Sheet. As of March 31, 2024 and December 31, 2023, the accrued interest receivables were $40 million and $44 million, respectively. For the Company’s accounting policy related to debt securities’ accrued interest receivables, see Note 1 — Summary of Significant Accounting Policies — Significant Accounting Policies — Allowance for Credit Losses on Available-for-Sale Debt Securities and Allowance for Credit Losses on Held-to-Maturity Debt Securities to the Consolidated Financial Statements in the Company’s 2023 Form 10-K.
(2)Includes GNMA AFS debt securities totaling $4.5 billion of amortized cost and $4.4 billion of fair value as of March 31, 2024, and $1.3 billion of amortized cost and $1.2 billion of fair value as of December 31, 2023.
(3)Includes GNMA HTM debt securities totaling $91 million of amortized cost and $73 million of fair value as of March 31, 2024, and $92 million of amortized cost and $75 million of fair value of as of December 31, 2023.
Unrealized Losses of Available-for-Sale Debt Securities

The following tables present the fair value and the associated gross unrealized losses of the Company’s AFS debt securities, aggregated by investment category and the length of time that the securities have been in a continuous unrealized loss position as of March 31, 2024 and December 31, 2023.
March 31, 2024
Less Than 12 Months12 Months or MoreTotal
($ in thousands)Fair ValueGross Unrealized LossesFair ValueGross Unrealized LossesFair ValueGross Unrealized Losses
AFS debt securities:
U.S. Treasury securities$— $— $621,094 $(55,196)$621,094 $(55,196)
U.S. government agency and U.S. government sponsored enterprise debt securities— — 360,802 (49,874)360,802 (49,874)
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities:
Commercial mortgage-backed securities— — 450,965 (57,669)450,965 (57,669)
Residential mortgage-backed securities1,577,361 (4,504)1,642,455 (236,858)3,219,816 (241,362)
Municipal securities4,189 (6)252,268 (37,906)256,457 (37,912)
Non-agency mortgage-backed securities:
Commercial mortgage-backed securities— — 333,996 (39,838)333,996 (39,838)
Residential mortgage-backed securities— — 519,657 (90,048)519,657 (90,048)
Corporate debt securities— — 502,647 (150,854)502,647 (150,854)
Foreign government bonds18,567 (61)88,060 (11,940)106,627 (12,001)
Asset-backed securities— — 40,712 (575)40,712 (575)
CLOs— — 87,851 (1,149)87,851 (1,149)
Total AFS debt securities$1,600,117 $(4,571)$4,900,507 $(731,907)$6,500,624 $(736,478)
December 31, 2023
Less Than 12 Months12 Months or MoreTotal
($ in thousands)Fair ValueGross Unrealized LossesFair ValueGross Unrealized LossesFair ValueGross Unrealized Losses
AFS debt securities:
U.S. Treasury securities$— $— $623,978 $(52,313)$623,978 $(52,313)
U.S. government agency and U.S. government-sponsored enterprise debt securities— — 364,446 (47,640)364,446 (47,640)
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities:
Commercial mortgage-backed securities— — 463,572 (63,276)463,572 (63,276)
Residential mortgage-backed securities9,402 (558)1,661,112 (229,155)1,670,514 (229,713)
Municipal securities2,825 (15)254,773 (36,327)257,598 (36,342)
Non-agency mortgage-backed securities:
Commercial mortgage-backed securities2,742 (4)364,774 (42,058)367,516 (42,062)
Residential mortgage-backed securities— — 553,671 (89,664)553,671 (89,664)
Corporate debt securities— — 502,425 (151,076)502,425 (151,076)
Foreign government bonds110,955 (144)88,616 (11,384)199,571 (11,528)
Asset-backed securities— — 42,300 (934)42,300 (934)
CLOs— — 612,861 (4,389)612,861 (4,389)
Total AFS debt securities$125,924 $(721)$5,532,528 $(728,216)$5,658,452 $(728,937)
As of March 31, 2024, the Company had 560 AFS debt securities in a gross unrealized loss position with no credit impairment, primarily consisting of 288 U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities, 66 corporate debt securities, and 95 non-agency mortgage-backed securities. In comparison, as of December 31, 2023, the Company had 547 AFS debt securities in a gross unrealized loss position with no credit impairment, primarily consisting of 255 U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities, 66 corporate debt securities, and 99 non-agency mortgage-backed securities.

Allowance for Credit Losses on Available-for-Sale Debt Securities

The Company evaluates each AFS debt security where the fair value declines below amortized cost. For a discussion of the factors and criteria the Company uses in analyzing securities for impairment related to credit losses, see Note 1 — Summary of Significant Accounting Policies — Significant Accounting Policies — Allowance for Credit Losses on Available-for-Sale Debt Securities to the Consolidated Financial Statements in the Company’s 2023 Form 10-K.

The gross unrealized losses presented in the preceding tables were primarily attributable to interest rate movement and the widening of liquidity and/or credit spreads. U.S. Treasury, U.S. government agency, U.S. government-sponsored agency, and U.S. government-sponsored enterprise debt and mortgage-backed securities are issued, guaranteed, or otherwise supported by the U.S. government and have a zero credit loss assumption. The remaining securities that were in an unrealized loss position as of March 31, 2024 were mainly comprised of the following:

•Corporate debt securities — The market value decline as of March 31, 2024 was primarily due to interest rate movement and spread widening. A portion of the corporate debt securities is comprised of subordinated debt securities issued by U.S. banks. Despite the reduction of the market value of these securities after the banking sector disruption in 2023, these securities are nearly all rated investment grade by nationally recognized statistical rating organizations (“NRSROs”) or issued by well-capitalized financial institutions with strong profitability. The contractual payments from these corporate debt securities have been and are expected to be received on time. The Company will continue to monitor the market developments in the banking sector and the credit performance of these securities.
•Non-agency mortgage-backed securities — The market value decline as of March 31, 2024 was primarily due to interest rate movement and spread widening. Since these securities are rated investment grade by NRSROs, or have high priority in the cash flow waterfall within the securitization structure, and the contractual payments have historically been on time, the Company believes the risk of credit losses on these securities is low.

As of both March 31, 2024 and December 31, 2023, the Company intended to hold the AFS debt securities with unrealized losses through the anticipated recovery period and it was more-likely-than-not that the Company would not have to sell these securities before the recovery of their amortized cost. The issuers of these securities have not, to the Company’s knowledge, established any cause for default on these securities. As a result, the Company expects to recover the entire amortized cost basis of these securities. Accordingly, there was no allowance for credit losses provided against these securities as of both March 31, 2024 and December 31, 2023. In addition, there was no provision for credit losses recognized for the three months ended March 31, 2024 and 2023.

Allowance for Credit Losses on Held-to-Maturity Debt Securities

The Company separately evaluates its HTM debt securities for any credit losses using an expected loss model, similar to the methodology used for loans. For additional information on the Company’s credit loss methodology, refer to Note 1 — Summary of Significant Accounting Policies — Significant Accounting Policies — Allowance for Credit Losses on Held-to-Maturity Debt Securities to the Consolidated Financial Statements in the Company’s 2023 Form 10-K.

The Company monitors the credit quality of the HTM debt securities using external credit ratings. As of March 31, 2024, all HTM securities were rated investment grade by NRSROs and issued, guaranteed, or supported by U.S. government entities and agencies. Accordingly, the Company applied a zero credit loss assumption and no allowance for credit losses was recorded as of both March 31, 2024 and December 31, 2023. Overall, the Company believes that the credit support levels of the debt securities are strong, and based on current assessments and macroeconomic forecasts, expects that full contractual cash flows will be received.
Realized Gains and Losses

The following table presents the gross realized gains from the sales and impairment write-off of AFS debt securities and the related tax expense (benefit) included in earnings for the three months ended March 31, 2024 and 2023:
Three Months Ended March 31,
($ in thousands)20242023
Gross realized gains from sales
$49 $— 
Impairment write-off (1)
$— $(10,000)
Related tax expense (benefit)
$14 $(2,956)
(1)During the first quarter of 2023, the Company recognized a $10 million impairment write-off on a subordinated debt security as a component of noninterest income in the Company’s Consolidated Statement of Income.

Interest Income

The following table presents the composition of interest income on debt securities for the three months ended March 31, 2024 and 2023:
Three Months Ended March 31,
($ in thousands)20242023
Taxable interest$70,328 $61,049 
Nontaxable interest5,064 4,882 
Total interest income on debt securities$75,392 $65,931 
Contractual Maturities of Available-for-Sale and Held-to-Maturity Debt Securities

The following tables present the contractual maturities, amortized cost, fair value and weighted-average yields of AFS and HTM debt securities as of March 31, 2024. Expected maturities will differ from contractual maturities on certain securities as the issuers and borrowers of the underlying collateral may have the right to call or prepay obligations with or without prepayment penalties.
($ in thousands)Within One Year
After One Year through Five Years
After Five Years through Ten Years After Ten Years Total
AFS debt securities:
U.S. Treasury securities
Amortized cost$34,901 $641,389 $— $— $676,290 
Fair value33,920 587,174 — — 621,094 
Weighted-average yield (1)
1.83 %1.17 %— %— %1.20 %
U.S. government agency and U.S. government-sponsored enterprise debt securities
Amortized cost51,238 94,159 127,833 137,446 410,676 
Fair value51,163 90,935 106,727 111,977 360,802 
Weighted-average yield (1)
4.94 %3.16 %1.60 %2.33 %2.62 %
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities
Amortized cost3,219 36,135 137,555 5,565,799 5,742,708 
Fair value3,130 34,513 125,890 5,284,485 5,448,018 
Weighted-average yield (1) (2)
2.68 %3.15 %2.73 %5.32 %5.24 %
Municipal securities
Amortized cost2,240 34,998 9,621 249,501 296,360 
Fair value2,219 32,747 8,885 214,644 258,495 
Weighted-average yield (1) (2)
3.39 %2.23 %3.22 %2.23 %2.27 %
Non-agency mortgage-backed securities
Amortized cost82,941 46,116 — 854,482 983,539 
Fair value82,055 45,322 — 726,276 853,653 
Weighted-average yield (1)
3.67 %3.70 %— %2.54 %2.69 %
Corporate debt securities
Amortized cost— — 349,501 304,000 653,501 
Fair value— — 294,845 207,802 502,647 
Weighted-average yield (1)
— %— %3.50 %1.97 %2.79 %
Foreign government bonds
Amortized cost32,724 105,868 50,000 50,000 238,592 
Fair value32,665 106,471 49,640 38,420 227,196 
Weighted-average yield (1)
3.01 %2.28 %5.72 %1.50 %2.94 %
Asset-backed securities
Amortized cost— — — 41,287 41,287 
Fair value— — — 40,712 40,712 
Weighted-average yield (1)
— %— %— %6.06 %6.06 %
CLOs
Amortized cost— — 69,000 20,000 89,000 
Fair value— — 67,924 19,927 87,851 
Weighted-average yield (1)
— %— %7.10 %6.84 %7.04 %
Total AFS debt securities
Amortized cost$207,263 $958,665 $743,510 $7,222,515 $9,131,953 
Fair value$205,152 $897,162 $653,911 $6,644,243 $8,400,468 
Weighted-average yield (1)
3.55 %1.72 %3.51 %4.67 %4.24 %
($ in thousands)Within One Year
After One Year through Five Years
After Five Years through Ten YearsAfter Ten YearsTotal
HTM debt securities:
U.S. Treasury securities
Amortized cost$—$530,921$—$—$530,921
Fair value—485,400——485,400
Weighted-average yield (1)
— %1.05 %— %— %1.05 %
U.S. government agency and U.S. government-sponsored enterprise debt securities
Amortized cost——343,666659,0311,002,697
Fair value——291,586514,213805,799
Weighted-average yield (1)
— %— %1.90 %1.89 %1.90 %
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities
Amortized cost—4,85294,5361,127,0311,226,419
Fair value—4,40179,571895,298979,270
Weighted-average yield (1) (2)
— %1.40 %1.59 %1.69 %1.68 %
Municipal securities
Amortized cost———188,605188,605
Fair value———144,009144,009
Weighted-average yield (1) (2)
— %— %— %1.99 %1.99 %
Total HTM debt securities
Amortized cost$—$535,773$438,202$1,974,667$2,948,642
Fair value$—$489,801$371,157$1,553,520$2,414,478
Weighted-average yield (1)
— %1.05 %1.83 %1.79 %1.66 %
(1)Weighted-average yields are computed based on amortized cost balances.
(2)Yields on tax-exempt securities are not presented on a tax-equivalent basis.

As of March 31, 2024 and December 31, 2023, AFS and HTM debt securities with carrying values of $5.8 billion and $7.0 billion, respectively, were pledged to secure borrowings, public deposits and for other purposes required or permitted by law.

Restricted Equity Securities

The following table presents the restricted equity securities included in Other assets on the Consolidated Balance Sheet as of March 31, 2024 and December 31, 2023:
($ in thousands)March 31, 2024December 31, 2023
Federal Reserve Bank of San Francisco (“FRBSF”) stock
$62,858 $62,561 
FHLB stock101,544 17,250 
Total restricted equity securities$164,402 $79,811