10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the quarterly period ended March 31, 2024

or

☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the transition period from__________ to __________

Commission file number: 001-32550 

WESTERN ALLIANCE BANCORPORATION

(Exact name of registrant as specified in its charter)

Delaware	88-0365922
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

One E. Washington Street, Suite 1400	Phoenix	Arizona	85004
(Address of principal executive offices)			(Zip Code)

(602) 389-3500

(Registrant’s telephone number, including area code) 

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Stock, $0.0001 Par Value	WAL	New York Stock Exchange
Depositary Shares, Each Representing a 1/400th Interest in a Share of 4.250% Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock, Series A	WAL PrA	New York Stock Exchange

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  ý    No  ¨

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).    Yes  ý    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” "accelerated filer," "smaller reporting company," and "emerging growth company" in Rule 12b-2 of the Exchange Act.

Large accelerated filer	☒	Accelerated filer	☐
Non accelerated filer	☐	Smaller reporting company	☐
		Emerging growth company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨ 

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ☐    No  ☒

As of April 26, 2024, Western Alliance Bancorporation had 110,110,512 shares of common stock outstanding.

INDEX

		Page
PART I. FINANCIAL INFORMATION
Item 1.	Glossary of Entities and Terms	3
	Financial Statements (Unaudited)
	Consolidated Balance Sheets	4
	Consolidated Income Statements	4
	Consolidated Statements of Comprehensive Income	6
	Consolidated Statements of Stockholders’ Equity	7
	Consolidated Statements of Cash Flows	8
	Notes to Unaudited Consolidated Financial Statements	10
Item 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	53
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	77
Item 4.	Controls and Procedures	79
PART II. OTHER INFORMATION
Item 1.	Legal Proceedings	79
Item 1A.	Risk Factors	80
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	80
Item 5.	Other Information	80
Item 6.	Exhibits	81
SIGNATURES		82

2

PART I

GLOSSARY OF ENTITIES AND TERMS

The acronyms and abbreviations identified below are used in various sections of this Form 10-Q, including "Management's Discussion and Analysis of Financial Condition and Results of Operations," in Item 2 and the Consolidated Financial Statements and the Notes to Unaudited Consolidated Financial Statements in Item 1 of this Form 10-Q.

ENTITIES / DIVISIONS:
ABA	Alliance Bank of Arizona	FIB	First Independent Bank
AmeriHome	AmeriHome Mortgage Company, LLC	TPB	Torrey Pines Bank
BON	Bank of Nevada	WA PWI	Western Alliance Public Welfare Investments, LLC
Bridge	Bridge Bank	WAB or Bank	Western Alliance Bank
Company	Western Alliance Bancorporation and subsidiaries	WABT	Western Alliance Business Trust
CSI	CS Insurance Company	WAL or Parent	Western Alliance Bancorporation
DST	Digital Settlement Technologies LLC	WATC	Western Alliance Trust Company, N.A.
TERMS:
ACL	Allowance for Credit Losses	FOMC	Federal Open Market Committee
AFS	Available-for-Sale	FRB	Federal Reserve Bank
ALCO	Asset and Liability Management Committee	FVO	Fair Value Option
AOCI	Accumulated Other Comprehensive Income	GAAP	U.S. Generally Accepted Accounting Principles
ASC	Accounting Standards Codification	GNMA	Government National Mortgage Association
ASU	Accounting Standards Update	GSE	Government-Sponsored Enterprise
Basel III	Banking Supervision's December 2010 final capital framework	HFI	Held for Investment
BOD	Board of Directors	HFS	Held for Sale
Capital Rules	The FRB, the OCC, and the FDIC 2013 Approved Final Rules	HTM	Held-to-Maturity
CDARS	Certificate Deposit Account Registry Service	HUD	U.S. Department of Housing and Urban Development
CECL	Current Expected Credit Losses	ICS	Insured Cash Sweep Service
CEO	Chief Executive Officer	IRLC	Interest Rate Lock Commitment
CET1	Common Equity Tier 1	ISDA	International Swaps and Derivatives Association
CFO	Chief Financial Officer	LIBOR	London Interbank Offered Rate
CLO	Collateralized Loan Obligation	LIHTC	Low-Income Housing Tax Credit
COVID-19	Coronavirus Disease 2019	MBS	Mortgage-Backed Securities
CRA	Community Reinvestment Act	MSR	Mortgage Servicing Right
CRE	Commercial Real Estate	NPV	Net Present Value
DTA	Deferred Tax Asset	OCI	Other Comprehensive Income
EBO	Early buyout	PPNR	Pre-Provision Net Revenue
ECR	Earnings credit rates	SEC	Securities and Exchange Commission
EPS	Earnings per share	SERP	Supplemental Executive Retirement Plan
ESG	Environmental, Social, and Governance	SOFR	Secured Overnight Financing Rate
EVE	Economic Value of Equity	TDR	Troubled Debt Restructuring
Exchange Act	Securities Exchange Act of 1934, as amended	TEB	Tax Equivalent Basis
FASB	Financial Accounting Standards Board	TSR	Total Shareholder Return
FDIC	Federal Deposit Insurance Corporation	UPB	Unpaid Principal Balance
FHA	Federal Housing Administration	USDA	United States Department of Agriculture
FHLB	Federal Home Loan Bank	VA	Veterans Affairs
FHLMC	Federal Home Loan Mortgage Corporation	VIE	Variable Interest Entity
FNMA	Federal National Mortgage Association	XBRL	eXtensible Business Reporting Language

3

Item 1.Financial Statements

WESTERN ALLIANCE BANCORPORATION AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

	March 31, 2024		December 31, 2023
	(Unaudited)
	(in millions, except shares and per share amounts)
Assets:
Cash and due from banks	$	264	$	276
Interest-bearing deposits in other financial institutions	3,286		1,300
Cash and cash equivalents	3,550		1,576
Investment securities - AFS, at fair value; amortized cost of $15,251 at March 31, 2024 and $11,849 at December 31, 2023 (ACL of $1 at March 31, 2024 and December 31, 2023)	14,509		11,165
Investment securities - HTM, at amortized cost and net of ACL of $8 (fair value of $1,253 and $1,251) at March 31, 2024 and December 31, 2023, respectively	1,453		1,421
Investment securities - equity	130		126
Investments in restricted stock, at cost	248		281
Loans HFS	1,841		1,402
Loans HFI, net of deferred fees and costs	50,700		50,297
Less: allowance for credit losses	(340)		(337)
Net loans held for investment	50,360		49,960
Mortgage servicing rights	1,178		1,124
Premises and equipment, net	344		339
Operating lease right of use asset	139		145
Bank owned life insurance	187		186
Goodwill and intangible assets, net	666		669
Deferred tax assets, net	300		287
Investments in LIHTC and renewable energy	553		573
Other assets	1,531		1,608
Total assets	$	76,989	$	70,862
Liabilities:
Deposits:
Non-interest-bearing demand	$	18,399	$	14,520
Interest-bearing	43,829		40,813
Total deposits	62,228		55,333
Other borrowings	6,221		7,230
Qualifying debt	896		895
Operating lease liability	172		179
Other liabilities	1,300		1,147
Total liabilities	70,817		64,784
Commitments and contingencies (Note 14)
Stockholders’ equity:
Preferred stock (par value $0.0001 and liquidation value per share of $25; 20,000,000 authorized; 12,000,000 depositary shares issued and outstanding at March 31, 2024 and December 31, 2023)	295		295
Common stock (par value $0.0001; 200,000,000 authorized; 113,005,772 shares issued at March 31, 2024 and 112,169,523 at December 31, 2023) and additional paid in capital	2,211		2,197
Treasury stock, at cost (2,825,815 shares at March 31, 2024 and 2,703,218 shares at December 31, 2023)	(124)		(116)
Accumulated other comprehensive loss	(558)		(513)
Retained earnings	4,348		4,215
Total stockholders’ equity	6,172		6,078
Total liabilities and stockholders’ equity	$	76,989	$	70,862

See accompanying Notes to Unaudited Consolidated Financial Statements.

4

WESTERN ALLIANCE BANCORPORATION AND SUBSIDIARIES

CONSOLIDATED INCOME STATEMENTS

	Three Months Ended March 31,
	2024		2023
	(in millions, except per share amounts)
Interest income:
Loans, including fees	$	871.9	$	832.7
Investment securities	142.4		94.3
Dividends and other	40.7		41.9
Total interest income	1,055.0		968.9
Interest expense:
Deposits	380.6		231.6
Qualifying debt	9.5		9.3
Other borrowings	66.0		118.1
Total interest expense	456.1		359.0
Net interest income	598.9		609.9
Provision for credit losses	15.2		19.4
Net interest income after provision for credit losses	583.7		590.5
Non-interest income:
Net loan servicing revenue	46.4		41.9
Net gain on loan origination and sale activities	45.3		31.4
Income from equity investments	17.1		1.4
Service charges and fees	9.9		9.5
Commercial banking related income	6.5		6.2
Fair value gain (loss) adjustments, net	0.3		(147.8)
(Loss) gain on recovery from credit guarantees	(0.5)		3.3
Loss on sales of investment securities	(0.9)		(12.5)
Other income	5.8		8.6
Total non-interest income	129.9		(58.0)
Non-interest expense:
Salaries and employee benefits	154.9		148.9
Deposit costs	137.0		86.9
Insurance	58.9		15.7
Data processing	36.0		26.4
Legal, professional, and directors' fees	30.1		23.1
Occupancy	17.5		16.5
Loan servicing expenses	15.0		13.8
Business development and marketing	5.5		5.2
Loan acquisition and origination expenses	4.8		4.4
Gain on extinguishment of debt	—		(12.7)
Other expense	22.1		19.7
Total non-interest expense	481.8		347.9
Income before provision for income taxes	231.8		184.6
Income tax expense	54.4		42.4
Net income	177.4		142.2
Dividends on preferred stock	3.2		3.2
Net income available to common stockholders	$	174.2	$	139.0
Earnings per share:
Basic	$	1.61	$	1.29
Diluted	1.60		1.28
Weighted average number of common shares outstanding:
Basic	108.5		108.1
Diluted	109.0		108.3
Dividends declared per common share	$	0.37	$	0.36

See accompanying Notes to Unaudited Consolidated Financial Statements.

5

WESTERN ALLIANCE BANCORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

	Three Months Ended March 31,
	2024		2023
	(in millions)
Net income	$	177.4	$	142.2
Other comprehensive (loss) income, net:
Unrealized (loss) gain on AFS securities, net of tax effect of $14.8 and $(20.7) respectively	(44.9)		60.1
Unrealized loss on junior subordinated debt, net of tax effect of $0.2 and $0.4 respectively	(0.5)		(1.1)
Realized loss on sale of AFS securities included in income, net of tax effect of $(0.2) and $(3.2) respectively	0.7		9.3
Realized loss on impairment of AFS securities included in income, net of tax effect of $— and $(0.4) respectively	—		1.2
Net other comprehensive (loss) income	(44.7)		69.5
Comprehensive income	$	132.7	$	211.7

See accompanying Notes to Unaudited Consolidated Financial Statements.

6

WESTERN ALLIANCE BANCORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

	Three Months Ended March 31,
	Preferred Stock			Common Stock			Additional Paid in Capital		Treasury Stock		Accumulated Other Comprehensive Income (Loss)		Retained Earnings		Total Stockholders’ Equity
	Shares	Amount		Shares	Amount
	(in millions)
Balance, December 31, 2022	12.0	$	294.5	108.9	$	—	$	2,163.7	$	(105.3)	$	(661.0)	$	3,664.1	$	5,356.0
Net income	—	—		—	—		—		—		—		142.2		142.2
Restricted stock, performance stock units, and other grants, net	—	—		0.7	—		6.1		—		—		—		6.1
Restricted stock surrendered (1)	—	—		(0.1)	—		—		(10.7)		—		—		(10.7)
Dividends paid to preferred stockholders	—	—		—	—		—		—		—		(3.2)		(3.2)
Dividends paid to common stockholders	—	—		—	—		—		—		—		(39.4)		(39.4)
Other comprehensive income, net	—	—		—	—		—		—		69.5		—		69.5
Balance, March 31, 2023	12.0	$	294.5	109.5	$	—	$	2,169.8	$	(116.0)	$	(591.5)	$	3,763.7	$	5,520.5
Balance, December 31, 2023	12.0	$	294.5	109.4	$	—	$	2,198.1	$	(116.3)	$	(512.9)	$	4,215.0	$	6,078.4
Net income	—	—		—	—		—		—		—		177.4		177.4
Restricted stock, performance stock units, and other grants, net	—	—		0.9	—		13.1		—		—		—		13.1
Restricted stock surrendered (1)	—	—		(0.1)	—		(0.2)		(7.6)		—		—		(7.8)
Dividends paid to preferred stockholders	—	—		—	—		—		—		—		(3.2)		(3.2)
Dividends paid to common stockholders	—	—		—	—		—		—		—		(40.7)		(40.7)
Other comprehensive loss, net	—	—		—	—		—		—		(44.7)		—		(44.7)
Balance, March 31, 2024	12.0	$	294.5	110.2	$	—	$	2,211.0	$	(123.9)	$	(557.6)	$	4,348.5	$	6,172.5

(1)Share amounts represent Treasury Shares.    

See accompanying Notes to Unaudited Consolidated Financial Statements.

7

WESTERN ALLIANCE BANCORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS

	Three Months Ended March 31,
	2024		2023
	(in millions)
Cash flows from operating activities:
Net income	$	177.4	$	142.2
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Provision for credit losses	15.2		19.4
Depreciation and amortization	20.8		16.5
Stock-based compensation	13.1		6.1
Deferred income taxes	2.7		(5.5)
Amortization of net (discounts) premiums for investment securities	(56.5)		2.0
Amortization of tax credit investments	18.6		11.3
Amortization of operating lease right of use asset	6.0		6.0
Amortization of net deferred loan fees and net purchase premiums	(20.9)		(22.6)
Purchases and originations of loans HFS	(9,984.5)		(8,067.2)
Proceeds from sales and payments on loans HFS	9,432.8		8,265.4
Mortgage servicing rights capitalized upon sale of mortgage loans	(188.7)		(142.4)
Net (gains) losses on:
Change in fair value of loans HFS, mortgage servicing rights, and related derivatives	(28.5)		43.5
Fair value adjustments	0.7		149.8
Sale of investment securities	0.9		12.5
Extinguishment of debt	—		(12.7)
Other	(3.0)		(3.6)
Other assets and liabilities, net	287.4		(63.4)
Net cash (used in) provided by operating activities	$	(306.5)	$	357.3
Cash flows from investing activities:
Investment securities - AFS
Purchases	$	(5,938.0)	$	(931.3)
Principal pay downs and maturities	1,285.6		61.1
Proceeds from sales	1,403.2		429.3
Investment securities - HTM
Purchases	(36.9)		(44.0)
Principal pay downs and maturities	4.2		7.7
Equity securities carried at fair value
Purchases	(0.2)		(0.5)
Proceeds from sale of mortgage servicing rights and related holdbacks, net	162.3		335.2
Sale (purchase) of other investments	16.6		(172.6)
Net increase in loans HFI	(525.7)		(1,003.5)
Purchase of premises, equipment, and other assets, net	(18.8)		(28.5)
Net cash used in investing activities	$	(3,647.7)	$	(1,347.1)

8

	Three Months Ended March 31,
	2024		2023
	(in millions)
Cash flows from financing activities:
Net increase (decrease) in deposits	$	6,895.7	$	(6,056.6)
Payments on long-term debt	(5.4)		(257.3)
Net (decrease) increase in short-term borrowings	(910.6)		9,952.9
Cash paid for tax withholding on vested restricted stock and other	(7.8)		(10.7)
Cash dividends paid on common stock and preferred stock	(43.9)		(42.6)
Net cash provided by financing activities	$	5,928.0	$	3,585.7
Net increase in cash and cash equivalents	1,973.8		2,595.9
Cash, cash equivalents, and restricted cash at beginning of period	1,576.1		1,043.4
Cash, cash equivalents, and restricted cash at end of period	$	3,549.9	$	3,639.3
Supplemental disclosure:
Cash paid during the period for:
Interest	$	439.0	$	329.5
Income taxes, net	(145.2)		(7.5)
Non-cash activities:
Transfers of mortgage-backed securities in settlement of secured borrowings	95.4		125.2
Transfers of securitized loans HFS to AFS securities	60.6		43.9
Transfers of loans HFI to HFS, net of fair value loss adjustment (1)	142.1		5,910.4

(1)Activity for the three months ended March 31, 2024 and 2023 excludes $89.1 million and $294.4 million, respectively, of loans transferred with an original designation of HFS, which sales activity was classified as operating cash flows.    

See accompanying Notes to Unaudited Consolidated Financial Statements.

9

WESTERN ALLIANCE BANCORPORATION AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Nature of operations

WAL is a bank holding company headquartered in Phoenix, Arizona, incorporated under the laws of the state of Delaware. WAL provides a full spectrum of customized loan, deposit, and treasury management capabilities, including 24/7 funds transfer and other digital payment offerings through its wholly-owned banking subsidiary, WAB.

WAB operates the following full-service banking divisions: ABA, BON, FIB, Bridge, and TPB. The Company also serves business customers through a national platform of specialized financial services, including mortgage banking services through AmeriHome, and digital payment services for the class action legal industry. In addition, the Company has the following non-bank subsidiaries: CSI, a captive insurance company formed and licensed under the laws of the State of Arizona and established as part of the Company's overall enterprise risk management strategy, and WATC, which provides corporate trust services and levered loan administration solutions.

Basis of presentation

The accompanying Unaudited Consolidated Financial Statements as of March 31, 2024 and for the three months ended March 31, 2024 and 2023 have been prepared in accordance with GAAP for interim financial information and Article 10 of Regulation S-X and, therefore, do not include all of the information and footnotes required by GAAP for complete financial statements. Accordingly, these statements should be read in conjunction with the Company's audited Consolidated Financial Statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2023. The accounts of the Company and its consolidated subsidiaries are included in the Consolidated Financial Statements.

The information furnished in these interim statements reflects all adjustments that are, in the opinion of management, necessary for a fair statement of the results for each respective period presented. Such adjustments are of a normal, recurring nature. The results of operations in the interim statements are not necessarily indicative of the results that may be expected for any other quarter or for the full year.

Recent accounting pronouncements

Improvements to Income Tax Disclosures

In December 2023, the FASB issued guidance within ASU 2023-09, Income Taxes (Topic 740). The amendments in this update are intended to increase visibility into various income tax components that affect the reconciliation of the effective tax rate to the statutory rate, as well as the qualitative and quantitative aspects of those components. Public business entities will be required to disclose on an annual basis, specific categories in the rate reconciliation and provide additional information for reconciling items that meet or exceed a five percent threshold (computed by multiplying pretax income by the applicable statutory income tax rate) and include disclosure of state and local jurisdictions that make up the majority of the state and local income tax category in the rate reconciliation. Additional disclosure items include disaggregation of income taxes paid to and income tax expense from federal, state, and foreign jurisdictions as well as disaggregation of income taxes paid to individual jurisdictions in which income taxes paid are equal to or greater than five percent of total income taxes paid.

The amendments in this update are effective for fiscal years beginning after December 15, 2024 and interim periods within fiscal years beginning after December 15, 2025 and may be applied on a prospective or retrospective basis. The Company is currently evaluating the impact these amendments will have on its Consolidated Financial Statements.

Accounting for and Disclosure of Crypto Assets

In December 2023, the FASB issued guidance within ASU 2023-08, Intangibles — Goodwill and Other — Crypto Assets (Topic 350). The amendments in this update require entities that hold certain crypto assets to measure such assets at fair value and recognize any changes in fair value in net income in each reporting period. Entities will also be required to present crypto assets measured at fair value separately from other intangible assets on the balance sheet and changes from the remeasurement of crypto assets separately from changes in the carrying amounts of other intangible assets in the income statement. Other disclosure items include the name, cost basis, fair value, and number of units for each significant crypto asset holding and the aggregate fair values and cost bases of crypto asset holdings that are not individually significant along with a rollforward of activity in the reporting period and disclosure of the method for determining the cost basis of the crypto assets.

10

The amendments in this update are effective for fiscal years beginning after December 15, 2024, including interim periods within those fiscal years and are applied through a cumulative-effect adjustment to the opening balance of retained earnings (as of the beginning of the annual reporting period of adoption). As the Company does not currently hold any crypto assets meeting the criteria outlined in the update, the adoption of this guidance is not expected to have an impact on the Company's Consolidated Financial Statements.

Improvements to Reportable Segment Disclosures

In November 2023, the FASB issued guidance within ASU 2023-07, Segment Reporting (Topic 280). The amendments in this update are intended to improve reportable segment disclosure requirements, primarily through enhanced disclosures related to significant segment expenses. The amendments do not change how an entity identifies its operating segments, aggregates those operating segments, or applies the quantitative thresholds to determine its reportable segments and all existing segment disclosure requirements in ASC 280 and other Codification topics remain unchanged. The amendments in this update are incremental and require public entities that report segment information to disclose, on an annual and interim basis, significant segment expenses that are regularly provided to the chief operating decision maker and included within each reported measure of segment profit or loss as well as other segment items. Annual disclosure of the title and position of the chief operating decision maker and how the reported measures of segment profit or loss are used to assess performance and allocation of resources is also required.

The amendments in this update are effective for fiscal years beginning after December 15, 2023 and interim periods within fiscal years beginning after December 15, 2024 and are applied on a retrospective basis. The Company is currently evaluating the impact these amendments will have on its Consolidated Financial Statements.

Recently adopted accounting guidance

Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method

In March 2023, the FASB issued guidance within ASU 2023-02, Investments — Equity Method and Joint Ventures (Topic 323). The amendments in this update permit entities to elect to account for tax equity investments, regardless of the tax credit program from which the income tax credits are received, using the proportional amortization method if certain conditions are met. Previously this option was only permitted for LIHTC investments. Additionally, the amendments in this update require that all tax equity investments accounted for using the proportional amortization method apply the delayed equity contribution guidance in Subtopic 323-740 and disclosure of the nature of an entity's tax equity investments and their effect on an entity's financial position and results of operations.

The Company adopted this accounting guidance prospectively on January 1, 2024. The adoption of this guidance did not have a material impact on the Company's Consolidated Financial Statements.

Use of estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Management's estimates and judgments are ongoing and are based on experience, current and expected future conditions, third-party evaluations and various other assumptions that management believes are reasonable under the circumstances. The results of these estimates form the basis for making judgments about the carrying values of assets and liabilities, as well as identifying and assessing the accounting treatment with respect to commitments and contingencies. Actual results may differ from those estimates and assumptions used in the Consolidated Financial Statements and related notes. Material estimates that are susceptible to significant changes in the near term relate to: 1) the determination of the ACL; 2) certain assets and liabilities carried at or evaluated using fair value measurements; 3) goodwill impairment; and 4) accounting for income taxes.

Principles of consolidation

As of March 31, 2024, WAL has the following significant wholly-owned subsidiaries: WAB and eight unconsolidated subsidiaries used as business trusts in connection with the issuance of trust-preferred securities.

WAB has the following significant wholly-owned subsidiaries: 1) WABT, which holds certain investment securities, municipal and nonprofit loans, and leases; 2) WA PWI, which holds interests in certain limited partnerships invested primarily in low income housing tax credits and small business investment corporations; 3) Helios Prime, which holds interests in certain limited partnerships invested in renewable energy projects; 4) BW Real Estate, Inc., which operates as a real estate investment trust and holds certain of WAB's real estate loans and related securities; and 5) Western Finance Company, which purchases and originates equipment finance leases and provides mortgage banking services through its wholly-owned subsidiary, AmeriHome.

11

The Company does not have any other significant entities that should be consolidated. All significant intercompany balances and transactions have been eliminated in consolidation.

Reclassifications

Certain amounts in the Consolidated Income Statements for the prior periods have been reclassified to conform to the current presentation. The reclassifications had no effect on net income or stockholders’ equity as previously reported.

12

2. INVESTMENT SECURITIES

The carrying amounts and fair values of investment securities are summarized as follows:

	March 31, 2024
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)		Fair Value
	(in millions)
Held-to-maturity
Tax-exempt	$	1,278	$	—	$	(169)	$	1,109
Private label residential MBS	183		—		(39)		144
Total HTM securities	$	1,461	$	—	$	(208)	$	1,253
Available-for-sale debt securities
U.S. Treasury securities	$	7,019	$	—	$	(8)	$	7,011
Residential MBS issued by GSEs	4,928		3		(395)		4,536
Private label residential MBS	1,301		1		(211)		1,091
Tax-exempt	927		—		(78)		849
Commercial MBS issued by GSEs	591		5		(10)		586
Corporate debt securities	411		—		(44)		367
Other	74		3		(8)		69
Total AFS debt securities	$	15,251	$	12	$	(754)	$	14,509

	December 31, 2023
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)		Fair Value
	(in millions)
Held-to-maturity
Tax-exempt	$	1,243	$	1	$	(140)	$	1,104
Private label residential MBS	186		—		(39)		147
Total HTM securities	$	1,429	$	1	$	(179)	$	1,251
Available-for-sale debt securities
U.S. Treasury securities	$	4,853	$	1	$	(1)	$	4,853
Residential MBS issued by GSEs	2,328		3		(359)		1,972
CLO	1,407		1		(9)		1,399
Private label residential MBS	1,320		1		(204)		1,117
Tax-exempt	925		—		(67)		858
Commercial MBS issued by GSEs	531		8		(9)		530
Corporate debt securities	411		—		(44)		367
Other	74		4		(9)		69
Total AFS debt securities	$	11,849	$	18	$	(702)	$	11,165

In addition, the Company held equity securities, which primarily consisted of preferred stock and CRA investments, with a fair value of $130 million and $126 million at March 31, 2024 and December 31, 2023, respectively. Unrealized gains on equity securities of $3.9 million and losses of $8.5 million for the three months ended March 31, 2024 and 2023, respectively, were recognized in earnings as a component of Fair value gain (loss) adjustments, net.

Securities with carrying amounts of approximately $8.0 billion and $7.7 billion at March 31, 2024 and December 31, 2023, respectively, were pledged for various purposes as required or permitted by law.

13

The following tables summarize the Company's AFS debt securities in an unrealized loss position, aggregated by major security type and length of time in a continuous unrealized loss position: 

	March 31, 2024
	Less Than Twelve Months				More Than Twelve Months				Total
	Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value
	(in millions)
Available-for-sale debt securities
U.S. Treasury securities	$	8	$	6,338	$	—	$	—	$	8	$	6,338
Residential MBS issued by GSEs	5		1,125		390		1,570		395		2,695
Private label residential MBS	—		—		211		997		211		997
Tax-exempt	1		33		77		815		78		848
Commercial MBS issued by GSEs	1		137		9		52		10		189
Corporate debt securities (1)	—		—		44		360		44		360
Other	—		—		8		55		8		55
Total AFS securities	$	15	$	7,633	$	739	$	3,849	$	754	$	11,482

(1)Includes securities with an ACL that have a fair value of $22 million and unrealized losses of $6 million.

	December 31, 2023
	Less Than Twelve Months				More Than Twelve Months				Total
	Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value
	(in millions)
Available-for-sale debt securities
U.S. Treasury securities	$	1	$	2,208	$	—	$	—	$	1	$	2,208
Residential MBS issued by GSEs	3		174		356		1,551		359		1,725
Private label residential MBS	—		—		204		1,020		204		1,020
CLO	—		—		9		845		9		845
Tax-exempt	3		67		64		773		67		840
Corporate debt securities (1)	—		—		44		359		44		359
Commercial MBS issued by GSEs	—		—		9		53		9		53
Other	—		—		9		54		9		54
Total AFS securities	$	7	$	2,449	$	695	$	4,655	$	702	$	7,104

(1)Includes securities with an ACL that have a fair value of $54 million and unrealized losses of $8 million.

The total number of AFS debt securities in an unrealized loss position at March 31, 2024 was 770, compared to 708 at December 31, 2023.

On a quarterly basis, the Company performs an impairment analysis on its AFS debt securities in an unrealized loss position at the end of the period to determine whether credit losses should be recognized on these securities.

Qualitative considerations made by the Company in its impairment analysis are further discussed below.

Government Issued Securities

U.S. Treasury securities and commercial and residential MBS are issued by either government agencies or GSEs. These securities are either explicitly or implicitly guaranteed by the U.S. government and are highly rated by major rating agencies. Further, principal and interest payments on these securities continue to be made on a timely basis.

14

Non-Government Issued Securities

Qualitative factors used in the Company's credit loss assessment of its securities that are not issued and guaranteed by the U.S. government include consideration of any adverse conditions related to a specific security, industry, or geographic region of its securities, any credit ratings below investment grade, the payment structure of the security and the likelihood of the issuer to be able to make payments that increase in the future, and failure of the issuer to make any scheduled principal or interest payments.

For the Company's corporate debt and tax-exempt securities, the Company also considers various metrics of the issuer including days of cash on hand, the ratio of long-term debt to total assets, the net change in cash between reporting periods, and consideration of any breach in covenant requirements. The Company's corporate debt securities are primarily investment grade, issuers continue to make timely principal and interest payments, and the unrealized losses on these security portfolios primarily relate to changes in interest rates and other market conditions not considered to be credit-related issues. The Company continues to receive timely principal and interest payments on its tax-exempt securities and the majority of these issuers have revenues pledged for payment of debt service prior to payment of other types of expenses.

In consideration of the continued effects from the bank failures in 2023, the Company performed a targeted impairment analysis on its AFS debt securities issued by regional banks held in its corporate debt securities portfolio. The Company considered the issuers' credit ratings, probability of default, and other factors. As a result of the analysis, a $0.1 million recovery and $19.3 million provision for credit losses were recognized during the three months ended March 31, 2024 and 2023, respectively. The provision for credit losses for the three months ended March 31, 2023 included recognition of a $17.1 million charge-off for one debt security issued by a regional bank that was sold. The Company does not intend to sell and it is more likely than not the Company will not be required to sell the remainder of these regional bank debt securities prior to their anticipated recovery, therefore, no additional credit losses on the Company's remaining portfolio have been recognized during the three months ended March 31, 2024.

For the Company's private label residential MBS, which consist of non-agency collateralized mortgage obligations secured by pools of residential mortgage loans, the Company also considers metrics such as securitization risk weight factor, current credit support, whether there were any mortgage principal losses resulting from defaults in payments on the underlying mortgage collateral, and the credit default rate over the last twelve months. These securities primarily carry investment grade credit ratings, principal and interest payments on these securities continue to be made on a timely basis, and credit support for these securities is considered adequate.

The Company's CLO portfolio consisted of highly rated securitization tranches, containing pools of medium to large-sized corporate, high yield loans. These were variable rate securities that had an investment grade rating of Single-A or better. Unrealized losses on these securities were primarily a function of the differential from the offer price and the valuation mid-market price as well as changes in interest rates.

Unrealized losses on the Company's other securities portfolio relate to taxable municipal and trust preferred securities. The Company is continuing to receive timely principal and interest payments on its taxable municipal securities, these securities continue to be highly rated and the number of days of cash on hand is strong. The Company's trust preferred securities are investment grade and the issuers continue to make timely principal and interest payments.

The following table presents a rollforward by major security type of the ACL on the Company's AFS debt securities:

	Three Months Ended March 31, 2024
	Balance, December 31, 2023		Recovery of Credit Losses		Charge-offs		Recoveries		Balance, March 31, 2024
	(in millions)
Available for sale securities
Corporate debt securities	$	1.4	$	(0.1)	$	—	$	—	$	1.3

	Three Months Ended March 31, 2023
	Balance, December 31, 2022		Provision for Credit Losses		Charge-offs		Recoveries		Balance March 31, 2023
	(in millions)
Available for sale securities
Corporate debt securities	$	—	$	19.3	$	(17.1)	$	—	$	2.2

15

The credit loss model under ASC 326-20, applicable to HTM debt securities, requires recognition of lifetime expected credit losses through an allowance account at the time the security is purchased.

The following table presents a rollforward by major security type of the ACL on the Company's HTM debt securities:

	Three Months Ended March 31, 2024
	Balance, December 31, 2023		Provision for Credit Losses		Charge-offs		Recoveries		Balance, March 31, 2024
	(in millions)
Held-to-maturity debt securities
Tax-exempt	$	7.8	$	0.4	$	—	$	—	$	8.2

	Three Months Ended March 31, 2023
	Balance, December 31, 2022		Provision for Credit Losses		Charge-offs		Recoveries		Balance March 31, 2023
	(in millions)
Held-to-maturity debt securities
Tax-exempt	$	5.2	$	1.3	$	—	$	—	$	6.5

No allowance has been recognized on the Company's HTM private label residential MBS as losses are not expected due to the Company holding a senior position in these securities.

Accrued interest receivable on HTM securities totaled $5 million at March 31, 2024 and December 31, 2023, and is excluded from the estimate of expected credit losses.

The following tables summarize the carrying amount of the Company’s investment ratings position, which are updated quarterly and used to monitor the credit quality of the Company's securities: 

	March 31, 2024
	AAA		Split-rated AAA/AA+		AA+ to AA-		A+ to A-		BBB+ to BBB-		BB+ and below		Unrated		Totals
	(in millions)
Held-to-maturity
Tax-exempt	$	—	$	—	$	—	$	—	$	—	$	—	$	1,278	$	1,278
Private label residential MBS	—		—		—		—		—		—		183		183
Total HTM securities (1)	$	—	$	—	$	—	$	—	$	—	$	—	$	1,461	$	1,461
Available-for-sale debt securities
U.S. Treasury securities	$	—	$	7,011	$	—	$	—	$	—	$	—	$	—	$	7,011
Residential MBS issued by GSEs	—		4,536		—		—		—		—		—		4,536
Private label residential MBS	1,064		—		26		—		—		1		—		1,091
Tax-exempt	9		15		356		380		—		—		89		849
Commercial MBS issued by GSEs	—		586		—		—		—		—		—		586
Corporate debt securities	—		—		—		76		242		49		—		367
Other	—		—		9		11		29		3		17		69
Total AFS securities (1)	$	1,073	$	12,148	$	391	$	467	$	271	$	53	$	106	$	14,509
Equity securities
Preferred stock	$	—	$	—	$	—	$	—	$	55	$	38	$	12	$	105
CRA investments	—		25		—		—		—		—		—		25
Total equity securities (1)	$	—	$	25	$	—	$	—	$	55	$	38	$	12	$	130

(1)For rated securities, if ratings differ, the Company uses an average of the available ratings by major credit agencies.

16

	December 31, 2023
	AAA		Split-rated AAA/AA+		AA+ to AA-		A+ to A-		BBB+ to BBB-		BB+ and below		Unrated		Totals
	(in millions)
Held-to-maturity
Tax-exempt	$	—	$	—	$	—	$	—	$	—	$	—	$	1,243	$	1,243
Private label residential MBS	—		—		—		—		—		—		186		186
Total HTM securities (1)	$	—	$	—	$	—	$	—	$	—	$	—	$	1,429	$	1,429
Available-for-sale debt securities
U.S. Treasury securities	$	—	$	4,853	$	—	$	—	$	—	$	—	$	—	$	4,853
Residential MBS issued by GSEs	—		1,972		—		—		—		—		—		1,972
CLO	79		—		1,265		55		—		—		—		1,399
Private label residential MBS	1,090		—		26		—		—		1		—		1,117
Tax-exempt	9		16		361		386		—		—		86		858
Commercial MBS issued by GSEs	—		530		—		—		—		—		—		530
Corporate debt securities	—		—		—		76		211		80		—		367
Other	—		—		9		11		28		4		17		69
Total AFS securities (1)	$	1,178	$	7,371	$	1,661	$	528	$	239	$	85	$	103	$	11,165
Equity securities
Preferred stock	$	—	$	—	$	—	$	—	$	54	$	35	$	11	$	100
CRA investments	—		26		—		—		—		—		—		26
Total equity securities (1)	$	—	$	26	$	—	$	—	$	54	$	35	$	11	$	126

(1)For rated securities, if ratings differ, the Company uses an average of the available ratings by major credit agencies.

A security is considered to be past due once it is 30 days contractually past due under the terms of the agreement. As of March 31, 2024, the Company did not have a significant amount of investment securities that were past due or on nonaccrual status.

The amortized cost and fair value of the Company's debt securities as of March 31, 2024, by contractual maturities are shown below. MBS are shown separately as individual MBS are comprised of pools of loans with varying maturities. Therefore, these securities are listed separately in the maturity summary.

	March 31, 2024
	Amortized Cost		Estimated Fair Value
	(in millions)
Held-to-maturity
Due in one year or less	$	29	$	29
After one year through five years	8		8
After five years through ten years	86		74
After ten years	1,155		998
Mortgage-backed securities	183		144
Total HTM securities	$	1,461	$	1,253
Available-for-sale
Due in one year or less	$	6,540	$	6,535
After one year through five years	646		634
After five years through ten years	278		242
After ten years	967		885
Mortgage-backed securities	6,820		6,213
Total AFS securities	$	15,251	$	14,509

17

The following table presents gross gains and losses on sales of investment securities:

	Three Months Ended March 31,
	2024		2023
	(in millions)
Available-for-sale securities
Gross gains	$	0.9	$	3.4
Gross losses	(1.8)		(15.9)
Net losses on AFS securities	$	(0.9)	$	(12.5)

During the three months ended March 31, 2024, the Company sold AFS securities with a carrying value of $1.4 billion and recognized a net loss of $0.9 million. CLOs were sold as part of the Company's efforts to shift the investment portfolio mix toward high quality liquid assets. During the three months ended March 31, 2023, the Company sold securities with a carrying value of $459 million and recognized a net loss of $12.5 million. Sales of CLOs were executed as part of the Company's balance sheet repositioning strategy and resulted in gross AFS securities losses for the three months ended March 31, 2023. Sales of MBS and tax-exempt municipal securities were completed to secure gains.

3. LOANS HELD FOR SALE

The Company purchases and originates residential mortgage loans through its AmeriHome mortgage banking business channel that are held for sale or securitization.

The following is a summary of loans HFS by type:

	March 31, 2024		December 31, 2023
	(in millions)
Government-insured or guaranteed:
EBO (1)	$	—	$	2
Non-EBO	764		498
Total government-insured or guaranteed	764		500
Agency-conforming	1,067		899
Non-agency	10		3
Total loans HFS	$	1,841	$	1,402

(1)    EBO loans are delinquent FHA, VA, or USDA loans purchased from GNMA pools under the terms of the GNMA MBS program that can be repooled when loans are brought current either through the borrower's reperformance or through completion of a loan modification.

The following is a summary of the net gain on loan purchase, origination, and sale activities on residential mortgage loans to be sold or securitized:

	Three Months Ended March 31,
	2024		2023
	(in millions)
Mortgage servicing rights capitalized upon sale of loans	$	188.7	$	142.4
Net proceeds from sale of loans (1)	(160.7)		(107.4)
Provision for and change in estimate of liability for losses under representations and warranties, net	3.2		2.4
Change in fair value	(6.7)		6.6
Change in fair value of derivatives:
Unrealized gain (loss) on derivatives	15.3		(22.2)
Realized gain on derivatives	(8.1)		(2.4)
Total change in fair value of derivatives	7.2		(24.6)
Net gain on residential mortgage loans HFS	$	31.7	$	19.4
Loan acquisition and origination fees	13.6		12.0
Net gain on loan origination and sale activities	$	45.3	$	31.4

(1)     Represents the difference between cash proceeds received upon settlement and loan basis.

18

4. LOANS, LEASES AND ALLOWANCE FOR CREDIT LOSSES

The composition of the Company's HFI loan portfolio is as follows:

	March 31, 2024		December 31, 2023
	(in millions)
Warehouse lending	$	6,915	$	6,618
Municipal & nonprofit	1,622		1,554
Tech & innovation	2,941		2,808
Equity fund resources	695		845
Other commercial and industrial	7,754		7,452
CRE - owner occupied	1,707		1,658
Hotel franchise finance	3,556		3,855
Other CRE - non-owner occupied	6,365		5,974
Residential	13,078		13,287
Residential - EBO	1,171		1,223
Construction and land development	4,746		4,862
Other	150		161
Total loans HFI	50,700		50,297
Allowance for credit losses	(340)		(337)
Total loans HFI, net of allowance	$	50,360	$	49,960

Loans classified as HFI are stated at the amount of unpaid principal, adjusted for net deferred fees and costs, premiums and discounts on acquired and purchased loans, and an ACL. Net deferred fees of $102 million and $108 million reduced the carrying value of loans as of March 31, 2024 and December 31, 2023, respectively. Net unamortized purchase premiums on acquired and purchased loans of $175 million and $177 million increased the carrying value of loans as of March 31, 2024 and December 31, 2023, respectively.

Nonaccrual and Past Due Loans

Loans are placed on nonaccrual status when management determines that the full repayment of principal and collection of interest according to contractual terms is no longer likely, generally when the loan becomes 90 days or more past due.

The following tables present nonperforming loan balances by loan portfolio segment:

	March 31, 2024
	Nonaccrual with No Allowance for Credit Loss		Nonaccrual with an Allowance for Credit Loss		Total Nonaccrual		Loans Past Due 90 Days or More and Still Accruing
	(in millions)
Municipal & nonprofit	$	—	$	5	$	5	$	—
Tech & innovation	34		28		62		—
Other commercial and industrial	15		20		35		6
CRE - owner occupied	8		2		10		—
Hotel franchise finance	—		12		12		—
Other CRE - non-owner occupied	174		1		175		—
Residential	—		79		79		—
Residential - EBO	—		—		—		349
Construction and land development	19		1		20		—
Other	1		—		1		—
Total	$	251	$	148	$	399	$	355

Loans contractually delinquent by 90 days or more and still accruing totaled $355 million at March 31, 2024 and primarily consisted of government guaranteed EBO residential loans.

19

	December 31, 2023
	Nonaccrual with No Allowance for Credit Loss		Nonaccrual with an Allowance for Credit Loss		Total Nonaccrual		Loans Past Due 90 Days or More and Still Accruing
	(in millions)
Municipal & nonprofit	$	—	$	6	$	6	$	—
Tech & innovation	23		10		33		—
Other commercial and industrial	19		34		53		—
CRE - owner occupied	8		1		9		—
Other CRE - non-owner occupied	82		1		83		—
Residential	—		70		70		—
Residential - EBO	—		—		—		399
Construction and land development	19		—		19		42
Total	$	151	$	122	$	273	$	441

Loans contractually delinquent by 90 days or more and still accruing totaled $441 million at December 31, 2023 and consisted of government guaranteed EBO residential loans and construction and land development loans.

The reduction in interest income associated with loans on nonaccrual status was approximately $4.9 million and $0.8 million for the three months ended March 31, 2024 and 2023.

The following table presents an aging analysis of past due loans by loan portfolio segment:

	March 31, 2024
	Current		30-59 Days Past Due		60-89 Days Past Due		Over 90 days Past Due		Total Past Due		Total
	(in millions)
Warehouse lending	$	6,915	$	—	$	—	$	—	$	—	$	6,915
Municipal & nonprofit	1,622		—		—		—		—		1,622
Tech & innovation	2,941		—		—		—		—		2,941
Equity fund resources	695		—		—		—		—		695
Other commercial and industrial	7,743		5		—		6		11		7,754
CRE - owner occupied	1,706		—		1		—		1		1,707
Hotel franchise finance	3,556		—		—		—		—		3,556
Other CRE - non-owner occupied	6,339		26		—		—		26		6,365
Residential	13,002		66		10		—		76		13,078
Residential - EBO	598		138		86		349		573		1,171
Construction and land development	4,741		5		—		—		5		4,746
Other	147		3		—		—		3		150
Total loans	$	50,005	$	243	$	97	$	355	$	695	$	50,700

	December 31, 2023
	Current		30-59 Days Past Due		60-89 Days Past Due		Over 90 days Past Due		Total Past Due		Total
	(in millions)
Warehouse lending	$	6,618	$	—	$	—	$	—	$	—	$	6,618
Municipal & nonprofit	1,554		—		—		—		—		1,554
Tech & innovation	2,808		—		—		—		—		2,808
Equity fund resources	845		—		—		—		—		845
Other commercial and industrial	7,439		13		—		—		13		7,452
CRE - owner occupied	1,627		—		31		—		31		1,658
Hotel franchise finance	3,824		15		16		—		31		3,855
Other CRE - non-owner occupied	5,974		—		—		—		—		5,974
Residential	13,199		68		20		—		88		13,287
Residential - EBO	545		173		106		399		678		1,223
Construction and land development	4,820		—		—		42		42		4,862
Other	160		1		—		—		1		161
Total loans	$	49,413	$	270	$	173	$	441	$	884	$	50,297

20

Credit Quality Indicators

The Company categorizes loans into risk categories based on relevant information about the ability of borrowers to service their debt such as current financial information, historical payment experience, credit documentation, public information, and current economic trends, among other factors. The Company analyzes loans individually to classify the loans as to credit risk. This analysis is performed on a quarterly basis. The following tables present risk ratings by loan portfolio segment and origination year. The origination year is the year of origination or renewal.

	Term Loan Amortized Cost Basis by Origination Year												Revolving Loans Amortized Cost Basis		Total
As of and for the three months ended March 31, 2024	2024		2023		2022		2021		2020		Prior
	(in millions)
Warehouse lending
Pass	$	17	$	550	$	338	$	7	$	285	$	—	$	5,695	$	6,892
Special mention	—		—		23		—		—		—		—		23
Classified	—		—		—		—		—		—		—		—
Total	$	17	$	550	$	361	$	7	$	285	$	—	$	5,695	$	6,915
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Municipal & nonprofit
Pass	$	59	$	113	$	200	$	166	$	168	$	893	$	—	$	1,599
Special mention	—		—		7		—		11		—		—		18
Classified	—		—		—		—		—		5		—		5
Total	$	59	$	113	$	207	$	166	$	179	$	898	$	—	$	1,622
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Tech & innovation
Pass	$	256	$	756	$	650	$	171	$	25	$	101	$	815	$	2,774
Special mention	—		9		30		10		—		—		8		57
Classified	—		13		50		1		5		—		41		110
Total	$	256	$	778	$	730	$	182	$	30	$	101	$	864	$	2,941
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Equity fund resources
Pass	$	19	$	78	$	92	$	40	$	2	$	—	$	463	$	694
Special mention	—		—		—		—		—		—		—		—
Classified	—		—		—		—		1		—		—		1
Total	$	19	$	78	$	92	$	40	$	3	$	—	$	463	$	695
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Other commercial and industrial
Pass	$	570	$	1,533	$	1,348	$	503	$	153	$	236	$	3,242	$	7,585
Special mention	—		—		1		—		—		1		—		2
Classified	1		88		24		48		1		4		1		167
Total	$	571	$	1,621	$	1,373	$	551	$	154	$	241	$	3,243	$	7,754
Current period gross charge-offs	$	—	$	—	$	0.1	$	2.0	$	—	$	0.1	$	0.1	$	2.3
CRE - owner occupied
Pass	$	35	$	180	$	377	$	320	$	155	$	551	$	40	$	1,658
Special mention	—		—		2		—		—		—		—		2
Classified	—		2		1		4		1		39		—		47
Total	$	35	$	182	$	380	$	324	$	156	$	590	$	40	$	1,707
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Hotel franchise finance
Pass	$	97	$	563	$	1,449	$	474	$	94	$	571	$	132	$	3,380
Special mention	—		34		—		67		—		—		—		101
Classified	—		—		—		20		—		55		—		75
Total	$	97	$	597	$	1,449	$	561	$	94	$	626	$	132	$	3,556
Current period gross charge-offs	$	—	$	—	$	—	$	1.4	$	—	$	1.5	$	—	$	2.9

21

	Term Loan Amortized Cost Basis by Origination Year												Revolving Loans Amortized Cost Basis		Total
As of and for the three months ended March 31, 2024	2024		2023		2022		2021		2020		Prior
	(in millions)
Other CRE - non-owner occupied
Pass	$	452	$	1,678	$	1,862	$	780	$	413	$	346	$	446	$	5,977
Special mention	—		94		49		—		40		—		—		183
Classified	—		98		—		93		1		13		—		205
Total	$	452	$	1,870	$	1,911	$	873	$	454	$	359	$	446	$	6,365
Current period gross charge-offs	$	—	$	—	$	—	$	5.0	$	—	$	—	$	—	$	5.0
Residential
Pass	$	78	$	278	$	3,513	$	7,890	$	805	$	458	$	23	$	13,045
Special mention	—		—		—		—		—		—		—		—
Classified	—		—		32		35		5		7		—		79
Cumulative fair value hedging adjustment	—		—		—		—		—		—		—		(46)
Total	$	78	$	278	$	3,545	$	7,925	$	810	$	465	$	23	$	13,078
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Residential - EBO
Pass	$	—	$	11	$	17	$	220	$	513	$	410	$	—	$	1,171
Special mention	—		—		—		—		—		—		—		—
Classified	—		—		—		—		—		—		—		—
Total	$	—	$	11	$	17	$	220	$	513	$	410	$	—	$	1,171
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Construction and land development
Pass	$	68	$	906	$	2,085	$	325	$	11	$	—	$	1,276	$	4,671
Special mention	—		—		5		—		—		—		—		5
Classified	—		—		19		—		51		—		—		70
Total	$	68	$	906	$	2,109	$	325	$	62	$	—	$	1,276	$	4,746
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Other
Pass	$	2	$	1	$	10	$	2	$	11	$	68	$	52	$	146
Special mention	—		—		—		—		—		3		—		3
Classified	—		—		—		—		—		1		—		1
Total	$	2	$	1	$	10	$	2	$	11	$	72	$	52	$	150
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Total by Risk Category
Pass	$	1,653	$	6,647	$	11,941	$	10,898	$	2,635	$	3,634	$	12,184	$	49,592
Special mention	—		137		117		77		51		4		8		394
Classified	1		201		126		201		65		124		42		760
Cumulative fair value hedging adjustment	—		—		—		—		—		—		—		(46)
Total	$	1,654	$	6,985	$	12,184	$	11,176	$	2,751	$	3,762	$	12,234	$	50,700
Current period gross charge-offs	$	—	$	—	$	0.1	$	8.4	$	—	$	1.6	$	0.1	$	10.2

22

	Term Loan Amortized Cost Basis by Origination Year												Revolving Loans Amortized Cost Basis		Total
As of December 31, 2023 and gross charge-offs for the three months ended March 31, 2023	2023		2022		2021		2020		2019		Prior
	(in millions)
Warehouse lending
Pass	$	582	$	323	$	7	$	289	$	—	$	—	$	5,391	$	6,592
Special mention	—		—		—		—		—		—		26		26
Classified	—		—		—		—		—		—		—		—
Total	$	582	$	323	$	7	$	289	$	—	$	—	$	5,417	$	6,618
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Municipal & nonprofit
Pass	$	102	$	167	$	176	$	169	$	68	$	848	$	—	$	1,530
Special mention	—		7		—		11		—		—		—		18
Classified	—		—		—		—		6		—		—		6
Total	$	102	$	174	$	176	$	180	$	74	$	848	$	—	$	1,554
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Tech & innovation
Pass	$	758	$	774	$	206	$	22	$	66	$	38	$	816	$	2,680
Special mention	5		30		12		—		—		—		1		48
Classified	15		52		1		5		—		—		7		80
Total	$	778	$	856	$	219	$	27	$	66	$	38	$	824	$	2,808
Current period gross charge-offs	$	1.8	$	—	$	—	$	—	$	—	$	—	$	—	$	1.8
Equity fund resources
Pass	$	154	$	62	$	21	$	3	$	1	$	—	$	604	$	845
Special mention	—		—		—		—		—		—		—		—
Classified	—		—		—		—		—		—		—		—
Total	$	154	$	62	$	21	$	3	$	1	$	—	$	604	$	845
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Other commercial and industrial
Pass	$	1,610	$	1,454	$	559	$	185	$	77	$	196	$	3,186	$	7,267
Special mention	90		1		1		—		—		—		1		93
Classified	1		25		59		2		4		—		1		92
Total	$	1,701	$	1,480	$	619	$	187	$	81	$	196	$	3,188	$	7,452
Current period gross charge-offs	$	—	$	—	$	5.9	$	1.2	$	—	$	0.1	$	0.1	$	7.3
CRE - owner occupied
Pass	$	165	$	344	$	322	$	163	$	132	$	444	$	40	$	1,610
Special mention	—		—		—		—		—		1		—		1
Classified	2		1		4		1		1		38		—		47
Total	$	167	$	345	$	326	$	164	$	133	$	483	$	40	$	1,658
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Hotel franchise finance
Pass	$	593	$	1,535	$	566	$	95	$	419	$	165	$	132	$	3,505
Special mention	34		—		66		—		35		68		—		203
Classified	24		8		48		—		43		24		—		147
Total	$	651	$	1,543	$	680	$	95	$	497	$	257	$	132	$	3,855
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Other CRE - non-owner occupied
Pass	$	1,832	$	1,784	$	754	$	457	$	166	$	206	$	387	$	5,586
Special mention	164		—		16		43		28		—		—		251
Classified	28		—		93		1		14		1		—		137
Total	$	2,024	$	1,784	$	863	$	501	$	208	$	207	$	387	$	5,974
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—

23

	Term Loan Amortized Cost Basis by Origination Year												Revolving Loans Amortized Cost Basis		Total
As of December 31, 2023 and gross charge-offs for the three months ended March 31, 2023	2023		2022		2021		2020		2019		Prior
	(in millions)
Residential
Pass	$	324	$	3,573	$	7,985	$	819	$	270	$	207	$	20	$	13,198
Special mention	—		—		—		—		—		—		—		—
Classified	1		26		33		4		4		2		—		70
Cumulative fair value hedging adjustment	—		—		—		—		—		—		—		19
Total	$	325	$	3,599	$	8,018	$	823	$	274	$	209	$	20	$	13,287
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Residential - EBO
Pass	$	2	$	8	$	227	$	534	$	231	$	221	$	—	$	1,223
Special mention	—		—		—		—		—		—		—		—
Classified	—		—		—		—		—		—		—		—
Total	$	2	$	8	$	227	$	534	$	231	$	221	$	—	$	1,223
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Construction and land development
Pass	$	1,013	$	2,231	$	385	$	10	$	—	$	—	$	1,151	$	4,790
Special mention	—		—		—		—		—		—		—		—
Classified	1		19		—		52		—		—		—		72
Total	$	1,014	$	2,250	$	385	$	62	$	—	$	—	$	1,151	$	4,862
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Other
Pass	$	4	$	10	$	3	$	11	$	3	$	62	$	66	$	159
Special mention	—		—		—		—		—		1		—		1
Classified	—		—		—		—		—		1		—		1
Total	$	4	$	10	$	3	$	11	$	3	$	64	$	66	$	161
Current period gross charge-offs	$	—	$	0.1	$	—	$	—	$	—	$	—	$	—	$	0.1
Total by Risk Category
Pass	$	7,139	$	12,265	$	11,211	$	2,757	$	1,433	$	2,387	$	11,793	$	48,985
Special mention	293		38		95		54		63		70		28		641
Classified	72		131		238		65		72		66		8		652
Cumulative fair value hedging adjustment	—		—		—		—		—		—		—		19
Total	$	7,504	$	12,434	$	11,544	$	2,876	$	1,568	$	2,523	$	11,829	$	50,297
Current period gross charge-offs	$	1.8	$	0.1	$	5.9	$	1.2	$	—	$	0.1	$	0.1	$	9.2

Restructurings for Borrowers Experiencing Financial Difficulty

The following tables present loan modifications during the period to borrowers experiencing financial difficulty:

	Amortized Cost Basis at March 31, 2024
	Payment Delay and Term Extension		Term Extension		Payment Delay		Total		% of Total Class of Financing Receivable
Three Months Ended	(dollars in millions)
Tech & innovation	$	—	$	—	$	30	$	30	1.0	%
Other commercial and industrial	—		8		—		8		0.1
CRE - owner occupied	—		31		—		31		1.8
Construction and land development	—		39		—		39		0.8
Total	$	—	$	78	$	30	$	108	0.2	%

24

	Amortized Cost Basis at March 31, 2023
	Payment Delay and Term Extension		Term Extension		Payment Delay		Total		% of Total Class of Financing Receivable
Three Months Ended	(dollars in millions)
Tech & innovation	$	2	$	—	$	5	$	7	0.3	%
Hotel franchise finance	—		18		—		18		0.5	%
Residential	—		—		1		1		0.0	%
Total	$	2	$	18	$	6	$	26	0.1	%

The performance of these modified loans is monitored for 12 months following the modification. As of March 31, 2024, modified loans of $129 million were current with contractual payments and $129 million were on nonaccrual status. As of December 31, 2023, modified loans of $95 million were current with contractual payments and $111 million were on nonaccrual status.

In the normal course of business, the Company also modifies EBO loans, which are delinquent FHA, VA, or USDA insured or guaranteed loans repurchased under the terms of the GNMA MBS program and can be repooled or resold when loans are brought current. During the three months ended March 31, 2024 and 2023, the Company completed modifications of EBO loans with an amortized cost of $90 million and $57 million, respectively. These modifications were largely payment delays and term extensions. Certain of these loans were repooled or resold after modification and are no longer included in the pool of loan modifications being monitored for future performance. As of March 31, 2024, modified EBO loans consisted of $38 million in loans that were current to 89 days delinquent and $12 million in loans greater than 90 days delinquent. As of December 31, 2023, modified EBO loans consisted of $26 million in loans that were current to 89 days delinquent and $12 million in loans greater than 90 days delinquent.

Collateral-Dependent Loans

The following table presents the amortized cost basis of collateral-dependent loans by loan portfolio segment:

	March 31, 2024						December 31, 2023
	Real Estate Collateral		Other Collateral		Total		Real Estate Collateral		Other Collateral		Total
	(in millions)
Municipal & nonprofit	$	—	$	5	$	5	$	—	$	6	$	6
Tech & innovation	—		35		35		—		—		—
Other commercial and industrial	—		26		26		—		29		29
CRE - owner occupied	42		—		42		43		—		43
Hotel franchise finance	63		—		63		104		—		104
Other CRE - non-owner occupied	204		—		204		136		—		136
Construction and land development	69		—		69		71		—		71
Total	$	378	$	66	$	444	$	354	$	35	$	389

The Company did not identify any significant changes in the extent to which collateral secures its collateral dependent loans, whether in the form of general deterioration or from other factors during the period ended March 31, 2024.

25

Allowance for Credit Losses

The ACL consists of the ACL on funded loans HFI and an ACL on unfunded loan commitments. The ACL on HTM securities is estimated separately from loans, see "Note 2. Investment Securities" of these Notes to Unaudited Consolidated Financial Statements for further discussion. Management considers the level of ACL to be a reasonable and supportable estimate of expected credit losses inherent within the Company's HFI loan portfolio as of March 31, 2024.

The below tables reflect the activity in the ACL on loans HFI by loan portfolio segment, which includes an estimate of future recoveries:

	Three Months Ended March 31, 2024
	Balance, December 31, 2023		Provision for (Recovery of) Credit Losses		Charge-offs		Recoveries		Balance, March 31, 2024
	(in millions)
Warehouse lending	$	5.8	$	1.5	$	—	$	—	$	7.3
Municipal & nonprofit	14.7		(0.8)		—		—		13.9
Tech & innovation	42.1		5.9		—		—		48.0
Equity fund resources	1.3		(0.1)		—		—		1.2
Other commercial and industrial	81.4		(12.4)		2.3		(0.4)		67.1
CRE - owner occupied	6.0		0.2		—		—		6.2
Hotel franchise finance	33.4		5.3		2.9		—		35.8
Other CRE - non-owner occupied	96.0		13.7		5.0		—		104.7
Residential	23.1		(1.0)		—		—		22.1
Residential - EBO	—		—		—		—		—
Construction and land development	30.4		1.5		—		—		31.9
Other	2.5		(0.4)		—		—		2.1
Total	$	336.7	$	13.4	$	10.2	$	(0.4)	$	340.3

	Three Months Ended March 31, 2023
	Balance, December 31, 2022		Provision for (Recovery of) Credit Losses		Charge-offs		Recoveries		Balance, March 31, 2023
	(in millions)
Warehouse lending	$	8.4	$	(1.8)	$	—	$	—	$	6.6
Municipal & nonprofit	15.9		2.5		—		—		18.4
Tech & innovation	30.8		7.4		1.8		—		36.4
Equity fund resources	6.4		(3.1)		—		—		3.3
Other commercial and industrial	85.9		(30.7)		7.3		(3.2)		51.1
CRE - owner occupied	7.1		1.5		—		—		8.6
Hotel franchise finance	46.9		0.8		—		—		47.7
Other CRE - non-owner occupied	47.4		19.0		—		—		66.4
Residential	30.4		1.3		—		—		31.7
Residential - EBO	—		—		—		—		—
Construction and land development	27.4		4.1		—		—		31.5
Other	3.1		—		0.1		—		3.0
Total	$	309.7	$	1.0	$	9.2	$	(3.2)	$	304.7

Accrued interest receivable of $278 million and $281 million at March 31, 2024 and December 31, 2023, respectively, was excluded from the estimate of credit losses. Whereas, accrued interest receivable related to the Company's Residential-EBO loan portfolio segment was included in the estimate of credit losses and had an allowance of $3 million and $4 million as of March 31, 2024 and December 31, 2023, respectively. Accrued interest receivable, net of any allowance, is included in Other assets on the Consolidated Balance Sheet.

26

In addition to the ACL on funded loans HFI, the Company maintains a separate ACL related to off-balance sheet credit exposures, including unfunded loan commitments. This allowance is included in Other liabilities on the Consolidated Balance Sheet.

The below table reflects the activity in the ACL on unfunded loan commitments:

	Three Months Ended March 31,
	2024		2023
	(in millions)
Balance, beginning of period	$	31.6	$	47.0
Provision for (Recovery of) credit losses	1.5		(2.2)
Balance, end of period	$	33.1	$	44.8

The following tables disaggregate the Company's ACL on funded loans HFI and loan balances by measurement methodology:

	March 31, 2024
	Loans						Allowance
	Collectively Evaluated for Credit Loss		Individually Evaluated for Credit Loss		Total		Collectively Evaluated for Credit Loss		Individually Evaluated for Credit Loss		Total
	(in millions)
Warehouse lending	$	6,915	$	—	$	6,915	$	7.3	$	—	$	7.3
Municipal & nonprofit	1,617		5		1,622		13.2		0.7		13.9
Tech & innovation	2,832		109		2,941		40.8		7.2		48.0
Equity fund resources	695		—		695		1.2		—		1.2
Other commercial and industrial	7,591		163		7,754		62.5		4.6		67.1
CRE - owner occupied	1,664		43		1,707		6.2		—		6.2
Hotel franchise finance	3,481		75		3,556		35.4		0.4		35.8
Other CRE - non-owner occupied	6,161		204		6,365		104.7		—		104.7
Residential	13,078		—		13,078		22.1		—		22.1
Residential EBO	1,171		—		1,171		—		—		—
Construction and land development	4,676		70		4,746		31.9		—		31.9
Other	149		1		150		2.1		—		2.1
Total	$	50,030	$	670	$	50,700	$	327.4	$	12.9	$	340.3

	December 31, 2023
	Loans						Allowance
	Collectively Evaluated for Credit Loss		Individually Evaluated for Credit Loss		Total		Collectively Evaluated for Credit Loss		Individually Evaluated for Credit Loss		Total
	(in millions)
Warehouse lending	$	6,618	$	—	$	6,618	$	5.8	$	—	$	5.8
Municipal & nonprofit	1,548		6		1,554		13.7		1.0		14.7
Tech & innovation	2,729		79		2,808		38.3		3.8		42.1
Equity fund resources	845		—		845		1.3		—		1.3
Other commercial and industrial	7,362		90		7,452		64.6		16.8		81.4
CRE - owner occupied	1,613		45		1,658		6.0		—		6.0
Hotel franchise finance	3,708		147		3,855		33.4		—		33.4
Other CRE - non-owner occupied	5,838		136		5,974		96.0		—		96.0
Residential	13,287		—		13,287		23.1		—		23.1
Residential EBO	1,223		—		1,223		—		—		—
Construction and land development	4,791		71		4,862		30.4		—		30.4
Other	161		—		161		2.5		—		2.5
Total	$	49,723	$	574	$	50,297	$	315.1	$	21.6	$	336.7

27

Loan Purchases and Sales

During the three months ended March 31, 2024 and 2023, loan purchases totaled $389 million and $511 million, respectively, and consisted primarily of commercial and industrial and residential loans. There were no loans purchased with more-than-insignificant deterioration in credit quality during the three months ended March 31, 2024 and 2023.

During the three months ended March 31, 2024, the Company sold loans with a carrying value of approximately $148 million and recognized a charge-off of $1.4 million and a net loss of $4.9 million on these loan sales. During the three months ended March 31, 2023, the Company transferred $6.9 billion of loans HFI (primarily commercial and industrial loans) to HFS and sold $915 million of those loans. The Company recognized a net loss of $140.8 million on these loan transfers and sales during the three months ended March 31, 2023.

5. MORTGAGE SERVICING RIGHTS

The following table presents the changes in fair value of the Company's MSR portfolio related to its mortgage banking business and other information related to its servicing portfolio:

	Three Months Ended March 31,
	2024		2023
	(in millions)
Balance, beginning of period	$	1,124	$	1,148
Additions from loans sold with servicing rights retained	189		142
Carrying value of MSRs sold	(156)		(350)
Change in fair value	60		(8)
Mark to market adjustments	—		3
Realization of cash flows	(39)		(25)
Balance, end of period	$	1,178	$	910
Unpaid principal balance of mortgage loans serviced for others	$	65,620	$	58,466

Changes in the fair value of MSRs are recorded as Net loan servicing revenue in the Consolidated Income Statement. Due to the regulatory capital impact of MSRs on capital ratios, the Company sells certain MSRs and related servicing advances in the normal course of business. The Company may also sell excess servicing spread related to certain mortgage loans serviced by the Company. During the three months ended March 31, 2024, MSR sales had an aggregate net sales price of $156 million and the UPB of loans underlying these sales totaled $10.8 billion. During the three months ended March 31, 2023, MSR sales had an aggregate net sales price of $350 million and the UPB of loans underlying these sales totaled $19.5 billion. As of March 31, 2024 and December 31, 2023, the Company had a remaining receivable balance of $34 million and $41 million, respectively, related to holdbacks on MSR sales for servicing transfers, which are recorded in Other assets on the Consolidated Balance Sheet.

The Company receives loan servicing fees, net of subservicing costs, based on the UPB of the underlying loans. Loan servicing fees are collected from payments made by borrowers. The Company may receive other remuneration from rights to various borrower contracted fees, such as late charges, collateral reconveyance charges, and non-sufficient funds fees. Contractually specified servicing fees, late fees, and ancillary income associated with the Company's MSR portfolio totaled $67.0 million for the three months ended March 31, 2024 and $62.9 million for the three months ended March 31, 2023, which are recorded as Net loan servicing revenue in the Consolidated Income Statement.

In accordance with its contractual loan servicing obligations, the Company is required to advance funds to or on behalf of investors when borrowers do not make payments. The Company advances property taxes and insurance premiums for borrowers who have insufficient funds in escrow accounts, plus any other costs to preserve real estate properties. The Company may also advance funds to maintain, repair, and market foreclosed real estate properties. The Company is entitled to recover all or a portion of the advances from borrowers of reinstated and performing loans, from the proceeds of liquidated properties or from the government agency or GSE guarantor of charged-off loans. Servicing advances are charged-off when they are deemed to be uncollectible. As of March 31, 2024 and December 31, 2023, net servicing advances totaled $67 million and $87 million, respectively, which are recorded as Other assets on the Consolidated Balance Sheet.

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The following table presents the effect of hypothetical changes in the fair value of MSRs caused by assumed immediate changes in interest rates, discount rates, and prepayment speeds that are used to determine fair value:

	March 31, 2024
	(in millions)
Fair value of mortgage servicing rights	$	1,178
Increase (decrease) in fair value resulting from:
Interest rate change of 50 basis points
Adverse change	(65)
Favorable change	57
Discount rate change of 50 basis points
Increase	(23)
Decrease	24
Conditional prepayment rate change of 1%
Increase	(33)
Decrease	36
Cost to service change of 10%
Increase	(14)
Decrease	14

Sensitivities are hypothetical changes in fair value and cannot be extrapolated because the relationship of changes in assumptions to changes in fair value may not be linear. In addition, the offsetting effect of hedging activities are not contemplated in these results and further, the effect of a variation in a particular assumption is calculated without changing any other assumptions, whereas a change in one factor may result in changes to another. Accordingly, no assurance can be given that actual results would be consistent with the results of these estimates. As a result, actual future changes in MSR values may differ significantly from those reported.

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6. DEPOSITS

The table below summarizes deposits by type:

	March 31, 2024		December 31, 2023
	(in millions)
Non-interest-bearing demand deposits	$	18,399	$	14,520
Interest-bearing transaction accounts	16,965		15,916
Savings and money market accounts	16,194		14,791
Time certificates of deposit ($250,000 or more)	1,683		1,478
Other time deposits (1)	8,987		8,628
Total deposits	$	62,228	$	55,333

(1)    Retail brokered time deposits over $250,000 of $5.7 billion and $5.8 billion as of March 31, 2024 and December 31, 2023, respectively, are included within Other time deposits as these deposits are generally participated out by brokers in shares below the FDIC insurance limit.

A summary of the contractual maturities for all time deposits as of March 31, 2024 is as follows: 

	(in millions)
2024	$	8,311
2025	2,328
2026	26
2027	3
2028	1
Thereafter	1
Total	$	10,670

Brokered deposits provide an additional source of deposits and are placed with the Bank through third-party brokers. At March 31, 2024 and December 31, 2023, the Company held wholesale brokered deposits of $6.5 billion and $6.6 billion, respectively, excluding reciprocal deposits. In addition, WAB is a participant in the IntraFi Network, a network that offers deposit placement services such as CDARS and ICS, and other reciprocal deposit networks which offer products that qualify large deposits for FDIC insurance. At March 31, 2024, the Company had $14.5 billion of reciprocal deposits, compared to $13.3 billion at December 31, 2023.

In addition, deposits for which the Company provides account holders with earnings credits or referral fees totaled $22.2 billion and $17.8 billion at March 31, 2024 and December 31, 2023, respectively. The Company incurred $131.2 million and $85.6 million in deposit related costs on these deposits during the three months ended March 31, 2024 and 2023, respectively. These costs are reported as Deposit costs in non-interest expense.

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7. OTHER BORROWINGS

The following table summarizes the Company’s other borrowings by type: 

	March 31, 2024		December 31, 2023
	(in millions)
Short-Term:
Federal funds purchased	$	—	$	175
FHLB advances	5,750		6,200
Repurchase agreements	8		382
Secured borrowings	22		27
Total short-term borrowings	$	5,780	$	6,784
Long-Term:
Credit linked notes, net	441		446
Total long-term borrowings	$	441	$	446
Total other borrowings	$	6,221	$	7,230

Short-Term Borrowings

Federal Funds Lines of Credit

The Company maintains overnight federal fund lines of credit totaling $839 million as of March 31, 2024, which have rates comparable to the federal funds effective rate plus 0.10% to 0.20%.

FHLB and FRB Advances

The Company also maintains secured overnight lines of credit with the FHLB and the FRB. The Company’s borrowing capacity is determined based on collateral pledged, generally consisting of investment securities and loans, at the time of the borrowing. As of March 31, 2024 and December 31, 2023, the Company had additional available credit with the FHLB of approximately $8.0 billion and $6.1 billion respectively. The weighted average rate on FHLB advances was 5.66% and 5.67% as of March 31, 2024 and December 31, 2023, respectively.

Repurchase Agreements

Warehouse borrowing lines of credit are used to finance the acquisition of loans through the use of repurchase agreements. Repurchase agreements operate as financings under which the Company transfers loans to secure these borrowings. The borrowing amounts are based on the attributes of the collateralized loans and are defined in the repurchase agreement of each warehouse lender. The Company retains beneficial ownership of the transferred loans and will receive the loans from the lender upon full repayment of the borrowing. The repurchase agreements may require the Company to transfer additional assets to the lender in the event the estimated fair value of the existing transferred loans declines.

As of March 31, 2024, the Company had access to approximately $2.3 billion in uncommitted warehouse funding, of which no amounts were drawn. As of December 31, 2023, there were $376 million in warehouse borrowings outstanding at a weighted average borrowing rate of 6.72%.

Other repurchase facilities include EBO loan and customer repurchase agreements. The total carrying value of these repurchase agreements was $8 million and $6 million as of March 31, 2024 and December 31, 2023, respectively.

Secured Borrowings

Secured borrowings consist of transfers of loans HFS not qualifying for sales accounting treatment. The weighted average interest rate on secured borrowings was 6.58% and 6.10% as of March 31, 2024 and December 31, 2023, respectively.

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Long-Term Borrowings

Credit Linked Notes

The Company entered into credit linked note transactions that effectively transfer the risk of first losses on reference pools of the Company's loans purchased under its residential mortgage purchase program to the purchasers of the notes. The principal and interest payable on these notes may be reduced by a portion of the Company's loss on such loans if one of the following occurs with respect to a covered loan: (i) realized losses incurred by the Company on a loan following a liquidation of the loan or certain other events, or (ii) a modification of the loan resulting in a reduction in payments. The aggregate losses, if any, for each payment date will be allocated to reduce the class principal amount and (for modifications) the current interest of the notes in reverse order of class priority. Losses on residential mortgages have not generally been significant.

The Company's outstanding credit linked note issuances are detailed in the tables below:

March 31, 2024
Description	Issuance Date	Maturity Date	Interest Rate	Principal		Debt Issuance Costs
				(in millions)
Residential mortgage loans (1)	December 12, 2022	October 25, 2052	SOFR + 7.80%	$	89	$	2
Residential mortgage loans (2)	June 30, 2022	April 25, 2052	SOFR + 6.00%	177		3
Residential mortgage loans (3)	December 29, 2021	July 25, 2059	SOFR + 4.67%	189		2
Total				$	455	$	7

December 31, 2023
Description	Issuance Date	Maturity Date	Interest Rate	Principal		Debt Issuance Costs
				(in millions)
Residential mortgage loans (1)	December 12, 2022	October 25, 2052	SOFR + 7.80%	$	90	$	2
Residential mortgage loans (2)	June 30, 2022	April 25, 2052	SOFR + 6.00%	179		3
Residential mortgage loans (3)	December 29, 2021	July 25, 2059	SOFR + 4.67%	191		3
Total				$	460	$	8

(1)    There are multiple classes of these notes, each with an interest rate of SOFR plus a spread that ranges from 2.25% to 11.00% (or, a weighted average spread of 7.80%) on a reference pool balance of $1.8 billion as of March 31, 2024 and December 31, 2023.

(2)    There are multiple classes of these notes, each with an interest rate of SOFR plus a spread that ranges from 2.25% to 15.00% (or, a weighted average spread of 6.00%) on a reference pool balance of $3.5 billion and $3.6 billion as of March 31, 2024 and December 31, 2023, respectively.

(3)    There are six classes of these notes, each with an interest rate of SOFR plus a spread that ranges from 3.15% to 8.50% (or, a weighted average spread of 4.67%) on a reference pool balance of $3.7 billion and $3.8 billion as of March 31, 2024 and December 31, 2023, respectively.

During the three months ended March 31, 2023, the Company recognized a gain on extinguishment of debt of $12.7 million related to the payoff or paydown of credit linked notes on its warehouse and equity fund resource loans.

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8. QUALIFYING DEBT

Subordinated Debt

The Company's subordinated debt issuances are detailed in the tables below:

March 31, 2024
Description	Issuance Date	Maturity Date	Interest Rate		Principal		Debt Issuance Costs
					(in millions)
WAL fixed-to-variable-rate (1)	June 2021	June 15, 2031	3.00	%	$	600	$	6
WAB fixed-to-variable-rate (2)	May 2020	June 1, 2030	5.25	%	225		1
Total					$	825	$	7

December 31, 2023
Description	Issuance Date	Maturity Date	Interest Rate		Principal		Debt Issuance Costs
					(in millions)
WAL fixed-to-variable-rate (1)	June 2021	June 15, 2031	3.00	%	$	600	$	6
WAB fixed-to-variable-rate (2)	May 2020	June 1, 2030	5.25	%	225		1
Total					$	825	$	7

(1)    Notes are redeemable, in whole or in part, beginning on June 15, 2026 at their principal amount plus accrued and unpaid interest and has a fixed interest rate of 3.00%. The notes also convert to a variable rate of three-month SOFR plus 225 basis points on this date.

(2)    Debt is redeemable, in whole or in part, on or after June 1, 2025 at its principal amount plus accrued and unpaid interest and has a fixed interest rate of 5.25% through June 1, 2025 and then converts to a variable rate per annum equal to three-month SOFR plus 512 basis points.

The carrying value of all subordinated debt issuances totaled $818 million at March 31, 2024 and December 31, 2023.

Junior Subordinated Debt

The Company has formed or acquired through acquisition eight statutory business trusts, which exist for the exclusive purpose of issuing Cumulative Trust Preferred Securities.

With the exception of debt issued by Bridge Capital Trust I and Bridge Capital Trust II, junior subordinated debt is recorded at fair value at each reporting date due to the FVO election made by the Company under ASC 825. The Company did not make the FVO election for the junior subordinated debt acquired in the Bridge acquisition. Accordingly, the carrying value of these trusts does not reflect the current fair value of the debt and includes a fair market value adjustment established at acquisition that is being accreted over the remaining life of the trusts.

The carrying value of junior subordinated debt was $78 million and $77 million as of March 31, 2024 and December 31, 2023, respectively, with maturity dates ranging from 2033 through 2037. The weighted average interest rate of all junior subordinated debt as of March 31, 2024 and December 31, 2023 was 7.90% and 7.93%, respectively.

In the event of certain changes or amendments to regulatory requirements or federal tax rules, the debt is redeemable in whole. The obligations under these instruments are fully and unconditionally guaranteed by the Company and rank subordinate and junior in right of payment to all other liabilities of the Company. Based on guidance issued by the FRB, the Company's securities continue to qualify as Tier 1 Capital.

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9. STOCKHOLDERS' EQUITY

Stock-Based Compensation

Restricted Stock Awards

Restricted stock awards granted to employees generally vest over a 3-year period and stock grants made to non-employee WAL directors have generally vested over six months, with the 2024 grants vesting over 1 year. The Company estimates the compensation cost for stock grants based upon the grant date fair value. Stock compensation expense is recognized on a straight-line basis over the requisite service period for the entire award. The aggregate grant date fair value for the restricted stock awards granted during the three months ended March 31, 2024 and 2023 was $44.8 million and $44.5 million, respectively. Stock compensation expense related to restricted stock awards granted to employees is included in Salaries and employee benefits in the Consolidated Income Statement. For restricted stock awards granted to WAL directors, the related stock compensation expense is included in Legal, professional, and directors' fees. For the three months ended March 31, 2024, the Company recognized $12.1 million, in stock-based compensation expense related to employee and WAL director stock grants, compared to $8.5 million for the three months ended March 31, 2023.

Performance Stock Units

The Company grants performance stock units to members of its executive management that do not vest unless the Company achieves a specified cumulative EPS target and a TSR performance measure over a three-year performance period. The number of shares issued will vary based on the cumulative EPS target and relative TSR performance factor that is achieved. The Company estimates the cost of performance stock units based upon the grant date fair value and expected vesting percentage over the three-year performance period. During the three months ended March 31, 2024, the Company recognized stock-based compensation expense of $1.0 million, compared to a $2.5 million net reversal for such units during the three months ended March 31, 2023 due to revised performance expectations.

The three-year performance period for the 2021 grant ended on December 31, 2023, and based on the Company's cumulative EPS and TSR performance measure for the performance period, these shares vested at 168% of the target award under the terms of the grant. As a result, 129,942 shares became fully vested and were distributed to executive management in the first quarter of 2024.

The three-year performance period for the 2020 grant ended on December 31, 2022, and based on the Company's cumulative EPS and TSR performance measure for the performance period, these shares vested at 180% of the target award under the terms of the grant. As a result, 157,784 shares became fully vested and distributed to executive management in the first quarter of 2023.

Cash Settled Restricted Stock Units

In 2024, the Company began granting cash settled restricted stock units to members of its executive management that vest equally on a monthly basis over a three-year period. As the awards are settled in cash and are not dependent on the occurrence of a future event, these awards are classified as liabilities on the Consolidated Balance Sheet. At each vesting date, the Company settles the vested stock units in cash at the settlement date stock price. During the three months ended March 31, 2024, the Company recognized compensation expense of $0.1 million related to these awards. There were no such awards outstanding during the three months ended March 31, 2023.

Preferred Stock

The Company has 12,000,000 depositary shares outstanding, each representing a 1/400th ownership interest in a share of the Company’s 4.250% Fixed-Rate Reset Non-Cumulative Perpetual Preferred Shares, Series A, par value $0.0001 per share, with a liquidation preference of $25 per depositary share (equivalent to $10,000 per share of Series A preferred stock). During the three months ended March 31, 2024 and 2023, the Company declared and paid a quarterly cash dividend of $0.27 per depositary share, for a total dividend payment to preferred stockholders of $3.2 million.

Common Stock Issuances

Pursuant to ATM Distribution Agreement

During the three months ended March 31, 2024 and 2023, the Company had no sales under the ATM program. Sales under the ATM program are made pursuant to a prospectus dated May 14, 2021 and prospectus supplements filed with the SEC in an offering of shares from the Company's shelf registration statement on Form S-3 (No. 333-256120). As of March 31, 2024, the remaining number of shares that can be sold under this agreement totaled 1,107,769.

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Cash Dividend on Common Shares

During the three months ended March 31, 2024, the Company declared and paid a quarterly cash dividend of $0.37 per share, for a total dividend payment to stockholders of $40.7 million. During the three months ended March 31, 2023, the Company declared and paid a quarterly cash dividend of $0.36 per share for a total dividend payment to stockholders of $39.4 million.

Treasury Shares

Treasury share purchases represent shares surrendered to the Company equal in value to the statutory payroll tax withholding obligations arising from the vesting of employee restricted stock awards. During the three months ended March 31, 2024, the Company purchased treasury shares of 122,597 at a weighted average price of $61.55 per share. During the three months ended March 31, 2023, the Company purchased treasury shares of 143,404, at a weighted average price of $74.70 per share.

10. ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

The following table summarizes the changes in accumulated other comprehensive income (loss) by component, net of tax, for the periods indicated: 

	Three Months Ended March 31,
	Unrealized holding gains (losses) on AFS securities		Unrealized holding losses on SERP		Unrealized holding gains (losses) on junior subordinated debt		Impairment loss on securities		Total
	(in millions)
Balance, December 31, 2023	$	(516.6)	$	(0.3)	$	2.8	$	1.2	$	(512.9)
Other comprehensive loss before reclassifications	(44.9)		—		(0.5)		—		(45.4)
Amounts reclassified from AOCI	0.7		—		—		—		0.7
Net current-period other comprehensive loss	(44.2)		—		(0.5)		—		(44.7)
Balance, March 31, 2024	$	(560.8)	$	(0.3)	$	2.3	$	1.2	$	(557.6)
Balance, December 31, 2022	$	(663.7)	$	(0.3)	$	3.0	$	—	$	(661.0)
Other comprehensive income (loss) before reclassifications	60.1		—		(1.1)		—		59.0
Amounts reclassified from AOCI	9.3		—		—		1.2		10.5
Net current-period other comprehensive income (loss)	69.4		—		(1.1)		1.2		69.5
Balance, March 31, 2023	$	(594.3)	$	(0.3)	$	1.9	$	1.2	$	(591.5)

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11. DERIVATIVES AND HEDGING ACTIVITIES

The Company is a party to various derivative instruments. The primary types of derivatives the Company uses are interest rate contracts, forward purchase and sale commitments, and interest rate futures. Generally, these instruments are used to help manage the Company's exposure to interest rate risk related to IRLCs and its inventory of loans HFS and MSRs and also to meet client financing and hedging needs.

Derivatives are recorded at fair value on the Consolidated Balance Sheet, after taking into account the effects of bilateral collateral and master netting agreements. These agreements allow the Company to settle all derivative contracts held with the same counterparty on a net basis, and to offset net derivative positions with related cash collateral, where applicable.

Derivatives Designated in Hedge Relationships

The Company utilizes derivatives that have been designated as part of a hedge relationship in accordance with the applicable accounting guidance to minimize the exposure to changes in benchmark interest rates, which reduces asset sensitivity and volatility of net interest income and EVE to interest rate fluctuations, such that interest rate risk falls within Board approved limits. The primary derivative instruments used to manage interest rate risk are interest rate swaps, which convert the contractual interest rate index of agreed-upon amounts of assets and liabilities (i.e., notional amounts) from either a fixed rate to a variable rate, or from a variable rate to a fixed rate.

The Company has pay fixed/receive variable interest rate swaps designated as fair value hedges of certain fixed rate loans. As a result, the Company receives variable-rate interest payments in exchange for making fixed-rate payments over the lives of the contracts without exchanging the notional amounts. The variable-rate interest payments were based on LIBOR and were converted to SOFR plus a spread adjustment upon the discontinuation of LIBOR in June 2023.

The Company also has pay fixed/receive variable interest rate swaps, designated as fair value hedges using the portfolio layer method to manage the exposure to changes in fair value associated with pools of fixed rate loans, resulting from changes in the designated benchmark interest rate (federal funds rate). These portfolio layer hedges provide the Company the ability to execute a fair value hedge of the interest rate risk associated with a portfolio of similar prepayable assets, whereby the last dollar amount estimated to remain in the portfolio of assets was identified as the hedged item. Under these interest rate swap contracts, the Company received a variable rate and paid a fixed rate on the outstanding notional amount.

The Company also had pay fixed/receive variable interest rate swaps, designated as fair value hedges using the last-of-layer method. Upon termination of these last-of-layer hedges in 2022, the cumulative basis adjustment on these hedges was allocated across the remaining loan pool and is being amortized over the remaining term. At March 31, 2024, the remaining cumulative basis adjustment on the terminated last-of-layer hedges totaled $6 million.

Derivatives Not Designated in Hedge Relationships

Management enters into certain contracts and agreements, including foreign exchange derivative contracts, back-to-back interest rate contracts, risk participation agreements and equity warrants, which are not designated as accounting hedges. Foreign exchange derivative contracts include spot, forward, forward window, and swap contracts. The purpose of these derivative contracts is to mitigate foreign currency risk on transactions entered into, or on behalf of customers. The Company's back-to-back interest rate contracts are used to allow customers to manage long-term interest rate risk. Contracts with customers, along with the related derivative trades the Company places, are both remeasured at fair value, and are referred to as economic hedges since they economically offset the Company's exposure.

The Company also uses derivative financial instruments to manage exposure to interest rate risk within its mortgage banking business related to IRLCs and its inventory of loans HFS and MSRs. The Company economically hedges the changes in fair value associated with changes in interest rates generally by utilizing forward sale commitments, interest rate futures and interest rate swaps.

Risk participation agreements are entered into with lead banks in certain loan syndications to share in the risk of default on interest rate swaps on participated loans. Equity warrants represent the right to buy shares in a company at a specified price and are acquired by the Company primarily in connection with negotiating credit facilities and certain other services to private, venture-backed companies in the technology industry.

36

Fair Value Hedges

As of March 31, 2024 and December 31, 2023, the following amounts are reflected on the Consolidated Balance Sheet related to cumulative basis adjustments for outstanding fair value hedges:

	March 31, 2024				December 31, 2023
	Carrying Value of Hedged Assets/(Liabilities)		Cumulative Fair Value Hedging Adjustment (1)		Carrying Value of Hedged Assets/(Liabilities)		Cumulative Fair Value Hedging Adjustment (1)
	(in millions)
Loans HFI, net of deferred loan fees and costs (2)	$	3,857	$	66	$	3,875	$	(6)

(1)Included in the carrying value of the hedged assets/(liabilities).

(2)As of March 31, 2024, included portfolio layer method derivative instruments with $3.5 billion designated as the hedged amount (from a closed portfolio of prepayable fixed rate loans with a carrying value of $6.6 billion). The cumulative basis adjustment included in the carrying value of these hedged items totaled $(46) million.

For the Company's derivative instruments that are designated and qualify as fair value hedges, the gain or loss on the derivative instrument as well as the offsetting loss or gain on the hedged item attributable to the hedged risk are recognized in current period earnings. The loss or gain on the hedged item is recognized in the same line item as the offsetting loss or gain on the related interest rate swaps. For loans, the gain or loss on the hedged item is included in interest income, as shown in the table below.

	Three Months Ended March 31,
	2024				2023
Income Statement Classification	Gain/(Loss) on Swaps		Gain/(Loss) on Hedged Item		Gain/(Loss) on Swaps		Gain/(Loss) on Hedged Item
	(in millions)
Interest income	$	72.0	$	(72.5)	$	(4.3)	$	4.3

In addition to the gains and losses on the Company's outstanding fair value hedges presented in the above table, the Company recognized $3.0 million in interest income related to the amortization of the cumulative basis adjustment on its discontinued last-of-layer hedges during the three months ended March 31, 2024 and 2023.

37

Fair Values, Volume of Activity, and Gain/Loss Information Related to Derivative Instruments

The following table summarizes the fair value of the Company's derivative instruments on a gross basis as of March 31, 2024, December 31, 2023, and March 31, 2023. The change in the notional amounts of these derivatives from March 31, 2023 to March 31, 2024 indicates the volume of the Company's derivative transaction activity during these periods. The derivative asset and liability balances are presented on a gross basis, prior to the application of bilateral collateral and master netting agreements. Total derivative assets and liabilities are adjusted to take into account the impact of legally enforceable master netting agreements that allow the Company to settle all derivative contracts with the same counterparty on a net basis and to offset the net derivative position with the related cash collateral. Where master netting agreements are not in effect or are not enforceable under bankruptcy laws, the Company does not adjust those derivative amounts with counterparties.

	March 31, 2024						December 31, 2023						March 31, 2023
			Fair Value						Fair Value						Fair Value
	Notional Amount		Derivative Assets		Derivative Liabilities		Notional Amount		Derivative Assets		Derivative Liabilities		Notional Amount		Derivative Assets		Derivative Liabilities
	(in millions)
Derivatives designated as hedging instruments:
Fair value hedges
Interest rate contracts	$	3,884	$	67	$	—	$	3,895	$	19	$	24	$	470	$	14	$	1
Total	$	3,884	$	67	$	—	$	3,895	$	19	$	24	$	470	$	14	$	1
Derivatives not designated as hedging instruments:
Foreign currency contracts	$	165	$	1	$	1	$	135	$	1	$	1	$	189	$	2	$	1
Forward purchase contracts	5,590		13		2		5,544		26		—		7,814		34		5
Forward sales contracts	8,380		4		28		7,626		1		55		9,702		3		64
Futures purchase contracts (1), (2)	124		—		—		124		—		—		—		—		—
Futures sales contracts (1), (2)	9,996		—		—		10,906		—		—		9,710		—		—
Interest rate lock commitments	1,810		10		1		1,822		18		—		1,557		14		1
Interest rate contracts	3,890		20		21		3,628		19		20		1,983		5		6
Risk participation agreements	75		—		—		72		—		—		51		—		—
Equity warrants	57		18		—		55		4		—		50		3		—
Total	$	30,087	$	66	$	53	$	29,912	$	69	$	76	$	31,056	$	61	$	77
Margin			139		8				202		(9)				5		(14)
Total, including margin	$	30,087	$	205	$	61	$	29,912	$	271	$	67	$	31,056	$	66	$	63

(1)The Company enters into futures purchase and sales contracts that are subject to daily remargining and almost all of which are based on three-month SOFR to hedge against its MSR valuation exposure. The notional amount on these contracts is substantial as these contracts have a short duration and are intended to cover the longer duration of MSR hedges.

(2)The notional amounts previously reported for March 31, 2023 have been adjusted to account for the impact of offsetting contracts. To close a futures contract prior to settlement, the Company purchases an offsetting future with the same terms as the original contract and these contracts no longer require settlement.

38

The fair value of derivative contracts, after taking into account the effects of master netting agreements, is included in Other assets or Other liabilities on the Consolidated Balance Sheet, as summarized in the table below:

	March 31, 2024						December 31, 2023						March 31, 2023
	Gross amount of recognized assets (liabilities)		Gross offset		Net assets (liabilities)		Gross amount of recognized assets (liabilities)		Gross offset		Net assets (liabilities)		Gross amount of recognized assets (liabilities)		Gross offset		Net assets (liabilities)
	(in millions)
Derivatives subject to master netting arrangements:
Assets
Foreign currency contracts	$	1	$	—	$	1	$	—	$	—	$	—	$	—	$	—	$	—
Forward purchase contracts	13		—		13		26		—		26		30		—		30
Forward sales contracts	4		—		4		1		—		1		3		—		3
Interest rate contracts	84		—		84		31		—		31		14		—		14
Margin	139		—		139		202		—		202		5		—		5
Netting	—		(33)		(33)		—		(67)		(67)		—		(38)		(38)
	$	241	$	(33)	$	208	$	260	$	(67)	$	193	$	52	$	(38)	$	14
Liabilities
Foreign currency contracts	$	(1)	$	—	$	(1)	$	(1)	$	—	$	(1)	$	—	$	—	$	—
Forward purchase contracts	(2)		—		(2)		—		—		—		(4)		—		(4)
Forward sales contracts	(27)		—		(27)		(55)		—		(55)		(52)		—		(52)
Interest rate contracts	(2)		—		(2)		(31)		—		(31)		(1)		—		(1)
Margin	(8)		—		(8)		9		—		9		14		—		14
Netting	—		33		33		—		67		67		—		38		38
	$	(40)	$	33	$	(7)	$	(78)	$	67	$	(11)	$	(43)	$	38	$	(5)
Derivatives not subject to master netting arrangements:
Assets
Foreign currency contracts	$	—	$	—	$	—	$	1	$	—	$	1	$	2	$	—	$	2
Forward purchase contracts	—		—		—		—				—		4		—		4
Interest rate lock commitments	10		—		10		18		—		18		14		—		14
Interest rate contracts	3		—		3		7		—		7		5		—		5
Equity warrants	18		—		18		4		—		4		3		—		3
	$	31	$	—	$	31	$	30	$	—	$	30	$	28	$	—	$	28
Liabilities
Foreign currency contracts	$	—	$	—	$	—	$	—	$	—	$	—	$	(1)	$	—	$	(1)
Forward purchase contracts	—		—		—		—		—		—		(1)		—		(1)
Forward sales contracts	(1)		—		(1)		—		—		—		(12)		—		(12)
Interest rate lock commitments	(1)		—		(1)		—		—		—		(1)		—		(1)
Interest rate contracts	(19)		—		(19)		(13)		—		(13)		(6)		—		(6)
	$	(21)	$	—	$	(21)	$	(13)	$	—	$	(13)	$	(21)	$	—	$	(21)
Total derivatives and margin
Assets	$	272	$	(33)	$	239	$	290	$	(67)	$	223	$	80	$	(38)	$	42
Liabilities	$	(61)	$	33	$	(28)	$	(91)	$	67	$	(24)	$	(64)	$	38	$	(26)

39

The following table summarizes the net gain (loss) on derivatives included in income:

	Three Months Ended March 31,
	2024		2023
	(in millions)
Net gain (loss) on loan origination and sale activities:
Interest rate lock commitments	$	(8.1)	$	11.5
Forward contracts	16.7		(36.8)
Interest rate swaps	(2.2)		1.2
Other contracts	0.7		(0.5)
Total gain (loss)	$	7.1	$	(24.6)
Net loan servicing revenue:
Forward contracts	$	(16.3)	$	(1.6)
Futures contracts	10.7		(4.0)
Interest rate swaps	(36.3)		19.0
Total (loss) gain	$	(41.9)	$	13.4

Counterparty Credit Risk

Like other financial instruments, derivatives contain an element of credit risk. This risk is measured as the expected replacement value of the contracts. Management enters into bilateral collateral and master netting agreements that provide for the net settlement of all contracts with the same counterparty. Additionally, management monitors counterparty credit risk exposure on each contract to determine appropriate limits on the Company's total credit exposure across all product types, which may require the Company to post collateral to counterparties when these contracts are in a net liability position and conversely, for counterparties to post collateral to the Company when these contracts are in a net asset position. Management reviews the Company's collateral positions on a daily basis and exchanges collateral with counterparties in accordance with standard ISDA documentation and other related agreements. The Company generally posts or holds collateral in the form of cash deposits or highly rated securities issued by the U.S. Treasury or government-sponsored enterprises (FNMA and FHLMC), or guaranteed by GNMA. At March 31, 2024, December 31, 2023, and March 31, 2023 collateral pledged by the Company to counterparties for its derivatives totaled $146 million, $216 million, and $33 million, respectively.

12. EARNINGS PER SHARE

Diluted EPS is calculated using the weighted average outstanding common shares during the period, including common stock equivalents. Basic EPS is calculated using the weighted average outstanding common shares during the period.

The following table presents the calculation of basic and diluted EPS: 

	Three Months Ended March 31,
	2024		2023
	(in millions, except per share amounts)
Weighted average shares - basic	108.5		108.1
Dilutive effect of stock awards	0.5		0.2
Weighted average shares - diluted	109.0		108.3
Net income available to common stockholders	$	174.2	$	139.0
Earnings per Common Share:
Basic	$	1.61	$	1.29
Diluted	1.60		1.28

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13. INCOME TAXES

The Company's effective tax rate was 23.5% and 23.0% for the three months ended March 31, 2024 and 2023, respectively. The increase in the effective tax rate was primarily due to an increase in nondeductible insurance premiums and shortfalls from stock compensation expense in 2024.

As of March 31, 2024, the net DTA balance totaled $300 million, an increase of $13 million from $287 million at December 31, 2023. This overall increase in the net DTA was primarily the result of a decrease in the fair market value of AFS securities.

Although realization is not assured, the Company believes that the realization of the recognized deferred tax asset of $300 million at March 31, 2024 is more-likely-than-not based on expectations as to future taxable income and based on available tax planning strategies that could be implemented if necessary to prevent a carryover from expiring.

At March 31, 2024 and December 31, 2023, the Company had no deferred tax valuation allowance.

LIHTC and renewable energy projects

The Company holds ownership interests in limited partnerships and limited liability companies that invest in affordable housing and renewable energy projects. These investments are designed to generate a return primarily through the realization of federal tax credits and deductions.

Investments in LIHTC and renewable energy totaled $553 million and $573 million as of March 31, 2024 and December 31, 2023, respectively. Unfunded LIHTC and renewable energy obligations are included in Other liabilities on the Consolidated Balance Sheet and totaled $308 million and $322 million as of March 31, 2024 and December 31, 2023, respectively. For the three months ended March 31, 2024 and 2023, $18.6 million and $11.3 million, respectively, of amortization related to LIHTC investments was recognized as a component of income tax expense.

14. COMMITMENTS AND CONTINGENCIES

Unfunded Commitments and Letters of Credit

The Company is party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include commitments to extend credit and letters of credit. They involve, to varying degrees, elements of credit risk in excess of amounts recognized on the Consolidated Balance Sheet.

Lines of credit are obligations to lend money to a borrower. Credit risk arises when the borrower's current financial condition may indicate less ability to pay than when the commitment was originally made. In the case of letters of credit, the risk arises from the potential failure of the customer to perform according to the terms of a contract. In such a situation, the third party might draw on the letter of credit to pay for completion of the contract and the Company would look to its customer to repay these funds with interest. To minimize the risk, the Company uses the same credit policies in making commitments and conditional obligations as it would for a loan to that customer.

Letters of credit and financial guarantees are commitments issued by the Company to guarantee the performance of a customer to a third party in borrowing arrangements. The Company generally has recourse to recover from the customer any amounts paid under the guarantees. Typically, letters of credit issued have expiration dates within one year.

A summary of the contractual amounts for unfunded commitments and letters of credit are as follows: 

	March 31, 2024		December 31, 2023
	(in millions)
Commitments to extend credit, including unsecured loan commitments of $937 at March 31, 2024 and $989 at December 31, 2023	$	13,106	$	13,291
Credit card commitments and financial guarantees	427		418
Letters of credit, including unsecured letters of credit of $6 at March 31, 2024 and $4 at December 31, 2023	238		222
Total	$	13,771	$	13,931

Commitments to extend credit are agreements to lend to a customer provided that there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. The Company enters into credit arrangements that generally provide for the termination of advances in the event of a covenant violation or other event of default. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Company evaluates each customer’s creditworthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary by the Company

41

upon extension of credit, is based on management’s credit evaluation of the party. The commitments are collateralized by the same types of assets used as loan collateral.

The Company has exposure to credit losses from unfunded commitments and letters of credit. As funds have not been disbursed on these commitments, they are not reported as loans outstanding. Credit losses related to these commitments are included in Other liabilities as a separate loss contingency and are not included in the ACL reported in "Note 4. Loans, Leases and Allowance for Credit Losses" of these Notes to Unaudited Consolidated Financial Statements. This loss contingency for unfunded loan commitments and letters of credit was $33 million and $32 million as of March 31, 2024 and December 31, 2023, respectively. Changes to this liability are adjusted through the provision for credit losses in the Consolidated Income Statement.

Commitments to Invest in Renewable Energy Projects

The Company has off-balance sheet commitments to invest in renewable energy projects, as described in "Note 13. Income Taxes" of these Notes to Unaudited Consolidated Financial Statements, subject to the underlying project meeting certain milestones. These conditional commitments totaled $38 million and $32 million as of March 31, 2024 and December 31, 2023, respectively.

Concentrations of Lending Activities

The Company does not have a single external customer from which it derives 10% or more of its revenues. The Company monitors concentrations of lending activities at the product and borrower relationship level. Commercial and industrial loans made up 39% and 38% of the Company's HFI loan portfolio as of March 31, 2024 and December 31, 2023, respectively. The Company's loan portfolio includes significant credit exposure to the CRE market. As of March 31, 2024 and December 31, 2023, CRE related loans accounted for approximately 32% and 33% of total loans, respectively. Approximately 16% of CRE loans, excluding construction and land loans, were owner-occupied as of March 31, 2024 and December 31, 2023. No borrower relationships at both the commitment and funded loan level exceeded 5% of total loans HFI as of March 31, 2024 and December 31, 2023.

Contingencies

The Company is involved in various lawsuits of a routine nature that are being handled and defended in the ordinary course of the Company’s business. Expenses are being incurred in connection with these lawsuits, but in the opinion of management, based in part on consultation with outside legal counsel, the resolution of these lawsuits and associated defense costs will not have a material impact on the Company’s financial position, results of operations, or cash flows.

Lease Commitments

The Company has operating leases under which it leases its branch offices, corporate headquarters, and other offices. Operating lease costs totaled $7.0 million during the three months ended March 31, 2024, compared to $7.4 million for the three months ended March 31, 2023. Other lease costs, which include common area maintenance, parking, and taxes, and were included as occupancy expense, totaled $1.5 million during the three months ended March 31, 2024, compared to $1.3 million for the three months ended March 31, 2023.

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15. FAIR VALUE ACCOUNTING

The fair value of an asset or liability is the price that would be received to sell the asset or paid to transfer the liability in an orderly transaction occurring in the principal market (or most advantageous market in the absence of a principal market) for such asset or liability. In estimating fair value, the Company utilizes valuation techniques that are consistent with the market approach, the income approach, and/or the cost approach. Such valuation techniques are consistently applied. Inputs to valuation techniques include the assumptions market participants would use in pricing an asset or liability. ASC 825 establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements).

In general, fair value is based upon quoted market prices, where available. If such quoted market prices are not available, fair value is based upon internally-developed models that primarily use, as inputs, observable market-based parameters. Valuation adjustments may be made to ensure financial instruments are recorded at fair value. These adjustments may include amounts to reflect counterparty credit quality and the Company’s creditworthiness, among other things, as well as unobservable parameters. Any such valuation adjustments are applied consistently over time. The Company’s valuation methodologies may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. While management believes the Company’s valuation methodologies are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different estimate of fair value at the reporting date. A more detailed description of the valuation methodologies used for assets and liabilities measured at fair value is set forth below.

Under ASC 825, the Company elected the FVO treatment for junior subordinated debt issued by WAL. This election is irrevocable and results in the recognition of unrealized gains and losses on the debt at each reporting date. These unrealized gains and losses are recognized in OCI rather than earnings. The Company did not elect FVO treatment for the junior subordinated debt assumed in the Bridge Capital Holdings acquisition.

The following table presents unrealized gains and losses from fair value changes on junior subordinated debt:

	Three Months Ended March 31,
	2024		2023
	(in millions)
Unrealized losses	$	(0.7)	$	(1.5)
Changes included in OCI, net of tax	(0.5)		(1.1)

Fair value on a recurring basis

Financial assets and financial liabilities measured at fair value on a recurring basis include the following:

AFS debt securities: Securities classified as AFS are reported at fair value utilizing Level 1 and Level 2 inputs. For these securities, the Company obtains fair value measurements from an independent pricing service. The fair value measurements consider observable data that may include quoted prices in active markets, dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information, and the bond’s terms and conditions, among other things.

Equity securities: Preferred stock and CRA investments are reported at fair value utilizing Level 1 inputs.

Independent pricing service: The Company's independent pricing service provides pricing information on the majority of the Company's Level 1 and Level 2 AFS debt securities. For a small subset of securities, other pricing sources are used, including observed prices on publicly-traded securities and dealer quotes. Management independently evaluates the fair value measurements received from the Company's third-party pricing service through multiple review steps. First, management reviews what has transpired in the marketplace with respect to interest rates, credit spreads, volatility, and mortgage rates, among other things, and develops an expectation of changes to the securities' valuations from the previous quarter. Then, management selects a sample of investment securities and compares the values provided by its primary third-party pricing service to the market values obtained from secondary sources, including other pricing services and safekeeping statements, and evaluates those with notable variances. In instances where there are discrepancies in pricing from various sources and management expectations, management may manually price securities using currently observed market data to determine whether they can develop similar prices or may utilize bid information from broker dealers. Any remaining discrepancies between management’s review and the prices provided by the vendor are discussed with the vendor and/or the Company’s other valuation advisors.

43

Loans HFS: Government-insured or guaranteed and agency-conforming 1-4 family residential loans HFS are salable into active markets. Accordingly, the fair value of these loans is based primarily on quoted market or contracted selling prices or a market price equivalent, which are categorized as Level 2 in the fair value hierarchy.

Mortgage servicing rights: MSRs are measured based on valuation techniques using Level 3 inputs. The Company uses a discounted cash flow model that incorporates assumptions market participants would use in estimating the fair value of servicing rights, including, but not limited to, option adjusted spread, conditional prepayment rate, servicing fee rate, recapture rate, and cost to service.

Derivative financial instruments: Forward purchase and sales contracts are measured based on valuation techniques using Level 2 inputs, such as quoted market prices, contracted selling prices, or a market price equivalent. Interest rate and foreign currency contracts are reported at fair value utilizing Level 2 inputs. The Company obtains dealer quotations to value its interest rate contracts. IRLCs are measured based on valuation techniques that consider loan type, underlying loan amount, maturity date, note rate, loan program, and expected settlement date, with Level 3 inputs for the servicing release premium and pull-through rate. These measurements are adjusted at the loan level to consider the servicing release premium and loan pricing adjustment specific to each loan. The base value is then adjusted for estimated pull-through rates. The pull-through rate and servicing fee multiple are unobservable inputs based on historical experience. Equity warrants are measured using a Black-Scholes option pricing model based on contractual strike price, expected term, the risk-free interest rate, and volatility, adjusted for a lack of marketability. The volatility input is considered Level 3 as the underlying equity is not publicly traded and is determined using comparable publicly traded companies.

Junior subordinated debt: The Company estimates the fair value of its junior subordinated debt using a discounted cash flow model which incorporates the effect of the Company’s own credit risk in the fair value of the liabilities (Level 3). The Company’s cash flow assumptions are based on contractual cash flows as the Company anticipates it will pay the debt according to its contractual terms.

The fair value of assets and liabilities measured at fair value on a recurring basis was determined using the following inputs: 

	Fair Value Measurements at the End of the Reporting Period Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value
March 31, 2024	(in millions)
Assets:
Available-for-sale debt securities
U.S. Treasury securities	$	7,011	$	—	$	—	$	7,011
Residential MBS issued by GSEs	—		4,536		—		4,536
Private label residential MBS	—		1,091		—		1,091
Tax-exempt	—		849		—		849
Commercial MBS issued by GSEs	—		586		—		586
Corporate debt securities	—		367		—		367
Other	28		41		—		69
Total AFS debt securities	$	7,039	$	7,470	$	—	$	14,509
Equity securities
Preferred stock	$	105	$	—	$	—	$	105
CRA investments	25		—		—		25
Total equity securities	$	130	$	—	$	—	$	130
Loans HFS (2)	$	—	$	1,809	$	3	$	1,812
MSRs	—		—		1,178		1,178
Derivative assets (1)	—		105		28		133
Liabilities:
Junior subordinated debt (3)	$	—	$	—	$	64	$	64
Derivative liabilities (1)	—		52		1		53

(1)See "Note 11. Derivatives and Hedging Activities." In addition, the carrying value of loans is decreased by $66 million as of March 31, 2024 for the effective portion of the hedge, which relates to the fair value of the hedges put in place to mitigate against fluctuations in interest rates. Derivative assets and liabilities exclude margin of $139 million and $8 million, respectively.

(2)Includes only the portion of loans HFS that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.

(3)Includes only the portion of junior subordinated debt that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.

44

	Fair Value Measurements at the End of the Reporting Period Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value
December 31, 2023	(in millions)
Assets:
Available-for-sale debt securities
U.S. Treasury securities	$	4,853	$	—	$	—	$	4,853
Residential MBS issued by GSEs	—		1,972		—		1,972
CLO	—		1,399		—		1,399
Private label residential MBS	—		1,117		—		1,117
Tax-exempt	—		858		—		858
Commercial MBS issued by GSEs	—		530		—		530
Corporate debt securities	—		367		—		367
Other	28		41		—		69
Total AFS debt securities	$	4,881	$	6,284	$	—	$	11,165
Equity securities
Preferred stock	$	100	$	—	$	—	$	100
CRA investments	26		—		—		26
Total equity securities	$	126	$	—	$	—	$	126
Loans - HFS (2)	$	—	$	1,377	$	3	$	1,380
Mortgage servicing rights	—		—		1,124		1,124
Derivative assets (1)	—		66		22		88
Liabilities:
Junior subordinated debt (3)	$	—	$	—	$	63	$	63
Derivative liabilities (1)	—		100		—		100

(1)See "Note 11. Derivatives and Hedging Activities." In addition, the carrying value of loans is increased by $6 million as of December 31, 2023 for the effective portion of the hedge, which relates to the fair value of the hedges put in place to mitigate against fluctuations in interest rates. Derivative assets and liabilities exclude margin of $202 million and $(9) million, respectively.

(2)Includes only the portion of loans HFS that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.

(3)Includes only the portion of junior subordinated debt that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.

The change in Level 3 liabilities measured at fair value on a recurring basis included in OCI was as follows:

	Junior Subordinated Debt
	Three Months Ended March 31,
	2024		2023
	(in millions)
Beginning balance	$	(62.8)	$	(62.5)
Change in fair value (1)	(0.7)		(1.5)
Ending balance	$	(63.5)	$	(64.0)

(1)Unrealized losses attributable to changes in the fair value of junior subordinated debt are recorded in OCI, net of tax, and totaled $(0.5) million and $(1.1) million for three months ended March 31, 2024 and 2023, respectively.

The significant unobservable inputs used in the fair value measurements of these Level 3 liabilities were as follows:

	March 31, 2024		Valuation Technique	Significant Unobservable Inputs	Input Value
	(in millions)
Junior subordinated debt	$	64	Discounted cash flow	Implied credit rating of the Company	8.73	%

	December 31, 2023		Valuation Technique	Significant Unobservable Inputs	Input Value
	(in millions)
Junior subordinated debt	$	63	Discounted cash flow	Implied credit rating of the Company	8.92	%

The significant unobservable inputs used in the fair value measurement of the Company’s junior subordinated debt as of March 31, 2024 and December 31, 2023 was the implied credit risk for the Company. As of March 31, 2024 and December 31, 2023,

45

the implied credit risk spread was calculated as the difference between the average of the 10 and 15-year 'BB' rated financial indexes over the corresponding swap indexes.

As of March 31, 2024, the Company estimates the discount rate at 8.73%, which represents an implied credit spread of 3.43% plus three-month SOFR (5.30%). As of December 31, 2023, the Company estimated the discount rate at 8.92%, which was a 3.59% credit spread plus three-month SOFR (5.33%).

The change in Level 3 assets and liabilities measured at fair value on a recurring basis included in income was as follows:

	Three Months Ended March 31, 2024
	MSRs		IRLCs (1)
	(in millions)
Balance, beginning of period	$	1,124	$	18
Purchases and additions	189		4,060
Sales and payments	(156)		—
Settlement of IRLCs upon acquisition or origination of loans HFS	—		(4,067)
Change in fair value	60		(1)
Realization of cash flows	(39)		—
Balance, end of period	$	1,178	$	10
Changes in unrealized gains for the period (2)	$	46	$	10

	Three Months Ended March 31, 2023
	MSRs		IRLCs (1)
	(in millions)
Balance, beginning of period	$	1,148	$	2
Purchases and additions	142		2,946
Sales and payments	(350)		—
Settlement of IRLCs upon acquisition or origination of loans HFS	—		(2,935)
Change in fair value	(8)		1
Mark to market adjustments	3		—
Realization of cash flows	(25)		—
Balance, end of period	$	910	$	14
Changes in unrealized gains for the period (2)	$	(3)	$	14

(1)     IRLC asset and liability positions are presented net.

(2)    Amounts recognized as part of non-interest income.

The significant unobservable inputs used in the fair value measurements of these Level 3 assets and liabilities were as follows:

		March 31, 2024
Asset/liability	Key inputs	Range	Weighted average
MSRs:	Option adjusted spread (in basis points)	(43) - 297	213
	Conditional prepayment rate (1)	9.1% - 22.0%	16.1		%
	Recapture rate	20.0% - 20.0%	20		%
	Servicing fee rate (in basis points)	25.0 - 56.5	38.4
	Cost to service	$75 - $95	$	86
IRLCs:	Servicing fee multiple	3.5 - 5.7	4.6
	Pull-through rate	68% - 100%	86		%

		December 31, 2023
Asset/liability	Key inputs	Range	Weighted average
MSRs:	Option adjusted spread (in basis points)	29 - 253	213
	Conditional prepayment rate (1)	9.5% - 23.9%	17.4		%
	Recapture rate	20.0% - 20.0%	20.0		%
	Servicing fee rate (in basis points)	25.0 - 56.5	35.6
	Cost to service	$93 - $100	$	95
IRLCs:	Servicing fee multiple	3.2 - 5.4	4.3
	Pull-through rate	68% - 100%	89		%

(1)    Lifetime total prepayment speed annualized.

46

The following is a summary of the difference between the aggregate fair value and the aggregate UPB of loans HFS for which the FVO has been elected:

	March 31, 2024						December 31, 2023
	Fair value		UPB		Difference		Fair value		UPB		Difference
	(in millions)
Loans HFS:
Current through 89 days delinquent	$	1,812	$	1,755	$	57	$	1,379	$	1,319	$	60
90 days or more delinquent	—		—		—		1		2		(1)
Total	$	1,812	$	1,755	$	57	$	1,380	$	1,321	$	59

Fair value on a nonrecurring basis

Certain assets are measured at fair value on a nonrecurring basis. That is, the assets are not measured at fair value on an ongoing basis, but are subject to fair value adjustments in certain circumstances (for example, when there is evidence of credit deterioration). The following table presents such assets carried on the Consolidated Balance Sheet by caption and by level within the ASC 825 hierarchy:

	Fair Value Measurements at the End of the Reporting Period Using
	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Active Markets for Similar Assets (Level 2)		Unobservable Inputs (Level 3)
	(in millions)
As of March 31, 2024:
Loans HFI	$	441	$	—	$	—	$	441
Other assets acquired through foreclosure	8		—		—		8
As of December 31, 2023:
Loans HFI	$	379	$	—	$	—	$	379
Other assets acquired through foreclosure	8		—		—		8

For Level 3 assets measured at fair value on a nonrecurring basis as of period end, the significant unobservable inputs used in the fair value measurements were as follows:

	March 31, 2024		Valuation Technique(s)		Significant Unobservable Inputs	Range
	(in millions)
Loans HFI	$	441	Collateral method	Third party appraisal	Costs to sell	6.0% to 10.0%
			Discounted cash flow method	Discount rate	Contractual loan rate	3.0% to 8.0%
				Scheduled cash collections	Probability of default	0% to 20.0%
				Proceeds from non-real estate collateral	Loss given default	0% to 70.0%
Other assets acquired through foreclosure	8		Collateral method	Third party appraisal	Costs to sell	4.0% to 10.0%

	December 31, 2023		Valuation Technique(s)		Significant Unobservable Inputs	Range
	(in millions)
Loans HFI	$	379	Collateral method	Third party appraisal	Costs to sell	6.0% to 10.0%
			Discounted cash flow method	Discount rate	Contractual loan rate	3.0% to 8.0%
				Scheduled cash collections	Probability of default	0% to 20.0%
				Proceeds from non-real estate collateral	Loss given default	0% to 70.0%
Other assets acquired through foreclosure	8		Collateral method	Third party appraisal	Costs to sell	4.0% to 10.0%

47

Loans HFI: Loans measured at fair value on a nonrecurring basis include collateral dependent loans. The specific reserves for these loans are based on collateral value, net of estimated disposition costs and other identified quantitative inputs. Collateral value is determined based on independent third-party appraisals or internally-developed discounted cash flow analyses. Appraisals may utilize a single valuation approach or a combination of approaches, including comparable sales and the income approach. Fair value is determined, where possible, using market prices derived from an appraisal or evaluation, which are considered to be Level 2. However, certain assumptions and unobservable inputs are often used by the appraiser, therefore qualifying the assets as Level 3 in the fair value hierarchy. In addition, when adjustments are made to an appraised value to reflect various factors such as the age of the appraisal or known changes in the market or the collateral, such valuation inputs are considered unobservable and the fair value measurement is categorized as a Level 3 measurement. Internal discounted cash flow analyses are also utilized to estimate the fair value of these loans, which considers internally-developed, unobservable inputs such as discount rates, default rates, and loss severity.

Total Level 3 collateral dependent loans had an estimated fair value of $441 million and $379 million at March 31, 2024 and December 31, 2023, respectively, net of a specific ACL of $3 million and $10 million at March 31, 2024 and December 31, 2023, respectively.

Other assets acquired through foreclosure: Other assets acquired through foreclosure consist of properties acquired as a result of, or in-lieu-of, foreclosure. These assets are initially reported at the fair value determined by independent appraisals using appraised value less estimated cost to sell. Such properties are generally re-appraised every 12 months. Costs relating to the development or improvement of the assets are capitalized and costs relating to holding the assets are charged to expense.

Fair value is determined, where possible, using market prices derived from an appraisal or evaluation, which are considered to be Level 2. However, certain assumptions and unobservable inputs are often used by the appraiser, therefore qualifying the assets as Level 3 in the fair value hierarchy. When significant adjustments are based on unobservable inputs, such as when a current appraised value is not available or management determines the fair value of the collateral is further impaired below the appraised value and there is no observable market price, the resulting fair value measurement has been categorized as a Level 3 measurement. The Company had $8 million of such assets at March 31, 2024 and December 31, 2023.

Fair Value of Financial Instruments

The estimated fair value of the Company’s financial instruments is as follows:

	March 31, 2024
	Carrying Amount		Fair Value
			Level 1		Level 2		Level 3		Total
	(in millions)
Financial assets:
Investment securities:
HTM	$	1,461	$	—	$	1,253	$	—	$	1,253
AFS	14,509		7,039		7,470		—		14,509
Equity	130		130		—		—		130
Derivative assets (1)	133		—		105		28		133
Loans HFS	1,841		—		1,818		23		1,841
Loans HFI, net	50,360		—		—		47,245		47,245
Mortgage servicing rights	1,178		—		—		1,178		1,178
Accrued interest receivable	360		—		360		—		360
Financial liabilities:
Deposits	$	62,228	$	—	$	62,263	$	—	$	62,263
Other borrowings	6,221		—		6,184		—		6,184
Qualifying debt	896		—		734		77		811
Derivative liabilities (1)	53		—		52		1		53
Accrued interest payable	168		—		168		—		168

(1)    Derivative assets and liabilities exclude margin of $139 million and $8 million, respectively.

48

	December 31, 2023
	Carrying Amount		Fair Value
			Level 1		Level 2		Level 3		Total
	(in millions)
Financial assets:
Investment securities:
HTM	$	1,429	$	—	$	1,251	$	—	$	1,251
AFS	11,165		4,881		6,284		—		11,165
Equity securities	126		126		—		—		126
Derivative assets (1)	84		—		66		18		84
Loans HFS	1,402		—		1,379		23		1,402
Loans HFI, net	49,960		—		—		46,877		46,877
Mortgage servicing rights	1,124		—		—		1,124		1,124
Accrued interest receivable	370		—		370		—		370
Financial liabilities:
Deposits	$	55,333	$	—	$	55,379	$	—	$	55,379
Other borrowings	7,230		—		7,192		—		7,192
Qualifying debt	895		—		734		76		810
Derivative liabilities (1)	100		—		100		—		100
Accrued interest payable	151		—		151		—		151

(1)    Derivative assets and liabilities exclude margin of $202 million and $(9) million, respectively.

Interest rate risk

The Company assumes interest rate risk (the risk to the Company’s earnings and capital from changes in interest rate levels) as a result of its normal operations. As a result, the fair values of the Company’s financial instruments, as well as its future net interest income, will change when interest rate levels change and that change may be either favorable or unfavorable to the Company.

Interest rate risk exposure is measured using interest rate sensitivity analysis to determine the Company's change in EVE and net interest income resulting from hypothetical changes in interest rates. If potential changes to EVE and net interest income resulting from hypothetical interest rate changes are not within the limits established by the BOD, the BOD may direct management to adjust the asset and liability mix to bring interest rate risk within BOD-approved limits.

WAB has an ALCO charged with managing interest rate risk within the BOD-approved limits. Limits are structured to preclude an interest rate risk profile which does not conform to both management and BOD risk tolerances without BOD and ALCO approval. Interest rate risk is also evaluated at the Parent level, which is reported to the BOD and its Finance and Investment Committee.

Fair value of commitments

The estimated fair value of letters of credit outstanding at March 31, 2024 and December 31, 2023 approximates zero as there have been no significant changes in borrower creditworthiness. Loan commitments on which the committed interest rates are less than the current market rate are insignificant at March 31, 2024 and December 31, 2023.

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16. SEGMENTS

The Company's reportable segments are aggregated with a focus on products and services offered and consist of three reportable segments:

•Commercial: provides commercial banking and treasury management products and services to small and middle-market businesses, specialized banking services to sophisticated commercial institutions and investors within niche industries, as well as financial services to the real estate industry.

•Consumer Related: offers both commercial banking services to enterprises in consumer-related sectors and consumer banking services, such as residential mortgage banking.

•Corporate & Other: consists of the Company's investment portfolio, Corporate borrowings and other related items, income and expense items not allocated to other reportable segments, and inter-segment eliminations.

The Company's segment reporting process begins with the assignment of all loan and deposit accounts directly to the segments where these products are originated and/or serviced. Equity capital is assigned to each segment based on the risk profile of their assets and liabilities. With the exception of goodwill, which is assigned a 100% weighting, equity capital allocations ranged from 0% to 20% during the period. Any excess or deficient equity not allocated to segments based on risk is assigned to the Corporate & Other segment.

Net interest income, provision for credit losses, and non-interest expense amounts are recorded in their respective segments to the extent the amounts are directly attributable to those segments. Net interest income is recorded in each segment on a TEB with a corresponding increase in income tax expense, which is eliminated in the Corporate & Other segment.

Further, net interest income of a reportable segment includes a funds transfer pricing process that matches assets and liabilities with similar interest rate sensitivity and maturity characteristics. Using this funds transfer pricing methodology, liquidity is transferred between users and providers. A net user of funds has lending/investing in excess of deposits/borrowings and a net provider of funds has deposits/borrowings in excess of lending/investing. A segment that is a user of funds is charged for the use of funds, while a provider of funds is credited through funds transfer pricing, which is determined based on the average estimated life of the assets or liabilities in the portfolio. Residual funds transfer pricing mismatches are allocable to the Corporate & Other segment and presented in net interest income.

The net income amount for each reportable segment is further derived by the use of expense allocations. Certain expenses not directly attributable to a specific segment are allocated across all segments based on key metrics, such as number of employees, number of transactions processed for loans and deposits, and average loan and deposit balances. These types of expenses include information technology, operations, human resources, finance, risk management, credit administration, legal, and marketing.

Income taxes are applied to each segment based on estimated effective tax rates. Any difference in the corporate tax rate and the aggregate effective tax rates in the segments are adjusted in the Corporate & Other segment.

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The following is a summary of operating segment information for the periods indicated:

Balance Sheet:	Consolidated Company		Commercial		Consumer Related		Corporate & Other
At March 31, 2024:	(in millions)
Assets:
Cash, cash equivalents, and investments	$	19,890	$	12	$	—	$	19,878
Loans HFS	1,841		—		1,841		—
Loans HFI, net of deferred fees and costs	50,700		29,642		21,058		—
Less: allowance for credit losses	(340)		(287)		(53)		—
Net loans HFI	50,360		29,355		21,005		—
Other assets acquired through foreclosure, net	8		8		—		—
Goodwill and other intangible assets, net	666		291		375		—
Other assets	4,224		414		1,961		1,849
Total assets	$	76,989	$	30,080	$	25,182	$	21,727
Liabilities:
Deposits	$	62,228	$	25,146	$	30,481	$	6,601
Borrowings and qualifying debt	7,117		9		21		7,087
Other liabilities	1,472		139		421		912
Total liabilities	70,817		25,294		30,923		14,600
Allocated equity:	6,172		2,590		1,814		1,768
Total liabilities and stockholders' equity	$	76,989	$	27,884	$	32,737	$	16,368
Excess funds provided (used)	—		(2,196)		7,555		(5,359)
Income Statement:
Three Months Ended March 31, 2024:	(in millions)
Net interest income	$	598.9	$	288.8	$	292.6	$	17.5
Provision for (recovery of) credit losses	15.2		15.3		(0.4)		0.3
Net interest income after provision for credit losses	583.7		273.5		293.0		17.2
Non-interest income	129.9		26.1		95.7		8.1
Non-interest expense	481.8		156.0		295.9		29.9
Income before income taxes	231.8		143.6		92.8		(4.6)
Income tax expense (benefit)	54.4		33.7		21.8		(1.1)
Net income (loss)	$	177.4	$	109.9	$	71.0	$	(3.5)

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Balance Sheet:	Consolidated Company		Commercial		Consumer Related		Corporate
At December 31, 2023:	(in millions)
Assets:
Cash, cash equivalents, and investments	$	14,569	$	13	$	125	$	14,431
Loans held for sale	1,402		—		1,402		—
Loans, net of deferred fees and costs	50,297		29,136		21,161		—
Less: allowance for credit losses	(337)		(284)		(53)		—
Total loans	49,960		28,852		21,108		—
Other assets acquired through foreclosure, net	8		8		—		—
Goodwill and other intangible assets, net	669		292		377		—
Other assets	4,254		390		1,826		2,038
Total assets	$	70,862	$	29,555	$	24,838	$	16,469
Liabilities:
Deposits	$	55,333	$	23,897	$	24,925	$	6,511
Borrowings and qualifying debt	8,125		7		402		7,716
Other liabilities	1,326		109		338		879
Total liabilities	64,784		24,013		25,665		15,106
Allocated equity:	6,078		2,555		1,790		1,733
Total liabilities and stockholders' equity	$	70,862	$	26,568	$	27,455	$	16,839
Excess funds provided (used)	—		(2,987)		2,617		370
Income Statements:
Three Months Ended March 31, 2023:	(in millions)
Net interest income	$	609.9	$	389.4	$	199.3	$	21.2
Provision for (recovery of) credit losses	19.4		(2.7)		1.5		20.6
Net interest income after provision for credit losses	590.5		392.1		197.8		0.6
Non-interest income	(58.0)		(96.7)		51.0		(12.3)
Non-interest expense	347.9		136.0		192.0		19.9
Income (loss) before income taxes	184.6		159.4		56.8		(31.6)
Income tax expense (benefit)	42.4		38.5		12.8		(8.9)
Net income (loss)	$	142.2	$	120.9	$	44.0	$	(22.7)

17. REVENUE FROM CONTRACTS WITH CUSTOMERS

Revenue streams within the scope of ASC 606 include service charges and fees, interchange fees on credit and debit cards, success fees, and legal settlement service fees. These revenues totaled $13.5 million and $14.0 million for the three months ended March 31, 2024 and 2023, respectively. The Company had no material unsatisfied performance obligations as of March 31, 2024 or December 31, 2023.

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Item 2.Management's Discussion and Analysis of Financial Condition and Results of Operations.

This discussion is designed to provide insight into management's assessment of significant trends related to the Company's consolidated financial condition, results of operations, liquidity, capital resources, and interest rate sensitivity. This Quarterly Report on Form 10-Q should be read in conjunction with the Company's Annual Report on Form 10-K for the year ended December 31, 2023 and the interim Unaudited Consolidated Financial Statements and Notes to Unaudited Consolidated Financial Statements hereto and financial information appearing elsewhere in this report. Unless the context requires otherwise, the terms "Company," "we," and "our" refer to Western Alliance Bancorporation and its wholly-owned subsidiaries on a consolidated basis.

Forward-Looking Information

Certain statements contained in this Quarterly Report on Form 10-Q for the quarter ended March 31, 2024 are “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Exchange Act. The Company intends such forward-looking statements to be covered by the safe harbor provisions for forward-looking statements. All statements other than statements of historical fact are “forward-looking statements” for purposes of federal and state securities laws, including without limitation, statements regarding our expectations with respect to our business, financial and operating results, including our deposits, liquidity and funding, changes in economic conditions and the related impact on the Company's business, and statements that are related to or are dependent on estimates or assumptions relating to expectations, beliefs, projections, future plans and strategies, anticipated events or trends, and similar expressions concerning matters that are not historical facts.

The forward-looking statements contained in this Form 10-Q reflect the Company's current views about future events and financial performance and involve certain risks, uncertainties, assumptions, and changes in circumstances that may cause the Company's actual results to differ significantly from historical results and those expressed in any forward-looking statement. Risks and uncertainties include those set forth in the Company's filings with the SEC and the following factors that could cause actual results to differ materially from those presented: 1) adverse financial market and economic conditions, including the effects of any recession in the United States, the impact of the bank failures that occurred in 2023 and related adverse developments in the banking industry, the potential impact on borrowers of supply chain disruptions and the economic and market impacts of the military conflicts in Ukraine and the Middle East; 2) changes in interest rates and increased rate competition; 3) exposure of financial instruments to certain market risks that may increase the volatility of earnings and AOCI; 4) the inherent risk associated with accounting estimates, including the impact to the allowance, provision for credit losses, and capital levels; 5) exposure to natural and man-made disasters in markets that we operate and the impact of climate change and ESG practices on us and our customers; 6) the potential adverse effects of unusual and infrequently occurring events, such as weather-related disasters, terrorist acts, geopolitical conflicts or public health events (such as the COVID-19 pandemic), and of governmental and societal responses thereto; 7) dependency on real estate and events that negatively impact the real estate market; 8) concentrations in certain business lines or product types within our loan portfolio; 9) residual risk retained by us on reference pools covered by credit linked notes; 10) exposure to environmental liabilities related to the properties to which we acquire title; 11) ability to compete in a highly competitive market; 12) expansion strategies through acquisitions or implementation of new lines of business or new products and services that may not be successful; 13) uncertainty associated with digital payment initiatives; 14) ability to recruit and retain qualified employees and implement adequate succession planning to mitigate the loss of key members of our senior management team; 15) ability to meet capital adequacy and liquidity requirements; 16) dependence on low-cost deposits; 17) risks related to representations and warranties made on third-party loan sales; 18) ability to borrow from the FHLB or the FRB; 19) a change in our creditworthiness; 20) information security breaches; 21) reliance on third parties to provide key components of our infrastructure; 22) perpetration of fraud; 23) ability to implement and improve our controls and processes to keep pace with growth; 24) the discontinuation of or substantial changes to interest rate benchmarks utilized in our lending, borrowing and hedging activities; 25) risk of operating in a highly regulated industry and our ability to remain in compliance; 26) ability to adapt to technological change; 27) failure to comply with state and federal banking agency laws and regulations; 28) results of any tax audit findings, challenges to our tax positions, or adverse changes or interpretations of tax laws; and 29) risks related to ownership and price of our preferred and common stock; and 30) ability to continue to declare quarterly dividends.

For more information regarding risks that may cause the Company's actual results to differ materially from any forward-looking statements, see “Risk Factors” in Part I, Item 1A of the Company's Annual Report on Form 10-K for the year ended December 31, 2023 and “Risk Factors” in Part II, Item 1A of this Form 10-Q. All forward-looking statements that are made or attributable to us are expressly qualified in their entirety by this cautionary notice. The forward-looking statements included herein are only made as of the date of this Form 10-Q. We undertake no obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

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Recent Banking Industry and Market Developments

Banking Industry

In November 2023, the FDIC approved a final rule implementing a special assessment to recover losses to the Deposit Insurance Fund associated with protecting uninsured depositors following the closures of Silicon Valley Bank and Signature Bank. The assessment base is equal to an institution’s estimated uninsured deposits as of December 31, 2022, adjusted to exclude the first $5 billion of estimated uninsured deposits. The special assessment will be collected over an eight-quarter collection period, at a quarterly rate of 3.36 basis points, with the first quarterly assessment period beginning on January 1, 2024. The amount of the total special assessment is subject to adjustment and will not be finalized by the FDIC until after termination of the receiverships. The Company recognized a charge of $17.6 million during the three months ended March 31, 2024 due to an adjustment of the loss estimate.

Market Developments

The Company's loan portfolio includes significant credit exposure to the CRE market, with CRE related loans comprising approximately 32% and 33% of total loans at March 31, 2024 and December 31, 2023, respectively. Approximately 16% of CRE loans, excluding construction and land loans, were owner occupied at March 31, 2024 and December 31, 2023 and approximately 5% were non-owner occupied office loans at March 31, 2024 and December 31, 2023. As elevated focus on the evolving industry dynamics facing the CRE market have emerged over the past year, the Company has been proactive in establishing enhanced monitoring policies and procedures as it relates to its CRE loans and has undertaken actions to limit growth of its CRE portfolio, as further discussed in “Item 1. Business, Lending Activities – Asset Quality” in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023. While the Company has not incurred significant charge-offs on its CRE portfolio to date, CRE market conditions may worsen, which could result in deterioration of asset quality in this portfolio.

Financial Overview and Highlights

WAL is a bank holding company headquartered in Phoenix, Arizona, incorporated under the laws of the state of Delaware. WAL provides a full spectrum of customized loan, deposit and treasury management capabilities, including 24/7 funds transfer and other digital payment offerings through its wholly-owned banking subsidiary, WAB.

WAB operates the following full-service banking divisions: ABA, BON and FIB, Bridge, and TPB. The Company also provides an array of specialized financial services across the country, including mortgage banking services through AmeriHome and digital payment services for the class action legal industry.

Financial Results Highlights for the First Quarter of 2024

•Net income available to common stockholders of $174.2 million, compared to $139.0 million for the first quarter 2023

•Diluted earnings per share of $1.60, compared to $1.28 per share for the first quarter 2023

•Net revenue of $728.8 million, compared to $551.9 million for the first quarter 2023, with non-interest expense of $481.8 million, compared to $347.9 million for the first quarter 2023

•PPNR of $247.0 million, up 21.1% from $204.0 million in the first quarter 20231

•Total loans HFI of $50.7 billion, up $403 million, or 0.8%, from December 31, 2023

•Total deposits of $62.2 billion, up $6.9 billion, or 12.5%, from December 31, 2023

•Stockholders' equity of $6.2 billion, an increase of $94 million from December 31, 2023

•Nonperforming assets (nonaccrual loans and repossessed assets) increased to 0.53% of total assets compared to 0.17% at March 31, 2023

•Annualized net loan charge-offs to average loans outstanding of 0.08%, compared to 0.05% for the first quarter 2023

•Net interest margin of 3.60%, decreased from 3.79% in the first quarter 2023

•Tangible common equity ratio of 6.8%, an increase compared to 6.5% at March 31, 20231

•Book value per common share of $53.33, an increase of 11.8% from $47.72 at March 31, 2023

•Tangible book value per share, net of tax, of $47.30, an increase of $5.74, or 13.8%, from $41.56 at March 31, 20231

•Efficiency ratio of 65.2% in the first quarter 2024, compared to 62.0% in the first quarter 20231

The impact to the Company from these items, and others of both a positive and negative nature, are discussed in more detail below as they pertain to the Company’s overall comparative performance for the three months ended March 31, 2024.

54

1 See Non-GAAP Financial Measures section beginning on page 57.

As a bank holding company, management focuses on key ratios in evaluating the Company's financial condition and results of operations.

Results of Operations and Financial Condition

A summary of the Company's results of operations, financial condition, and selected metrics are included in the following tables: 

		Three Months Ended March 31,
		2024			2024 Adjusted (1)			2023
	(in millions, except per share amounts)
Net income		$	177.4		$	190.9		$	142.2
Net income available to common stockholders		174.2			187.7			139.0
Earnings per share - basic		1.61			1.73			1.29
Earnings per share - diluted		1.60			1.72			1.28
Return on average assets		0.98		%	1.06		%	0.81		%
Return on average equity		11.5			12.4			10.3
Return on average tangible common equity (1)		13.4			14.5			12.2
Net interest margin		3.60						3.79

(1) See Non-GAAP Financial Measures section beginning on page 57.

	March 31, 2024		December 31, 2023
	(in millions)
Total assets	$	76,989	$	70,862
Loans HFS	1,841		1,402
Loans HFI, net of deferred fees and costs	50,700		50,297
Investment securities	16,100		12,720
Total deposits	62,228		55,333
Other borrowings	6,221		7,230
Qualifying debt	896		895
Stockholders' equity	6,172		6,078
Tangible common equity, net of tax (1)	5,213		5,116

(1) See Non-GAAP Financial Measures section beginning on page 57.

For all banks and bank holding companies, asset quality plays a significant role in the overall financial condition of the institution and results of operations. The Company measures asset quality in terms of nonaccrual loans as a percentage of gross loans and net charge-offs as a percentage of average loans. Net charge-offs are calculated as the difference between charged-off loans and recovery payments received on previously charged-off loans. The following table summarizes the Company's key asset quality metrics for loans HFI: 

	March 31, 2024			December 31, 2023
	(dollars in millions)
Nonaccrual loans	$	399		$	273
Repossessed assets	8			8
Non-performing assets	542			418
Nonaccrual loans to funded loans	0.79		%	0.54		%
Nonaccrual and repossessed assets to total assets	0.53			0.40
Allowance for loan losses to funded loans	0.67			0.67
Allowance for credit losses to funded loans	0.74			0.73
Net charge-offs to average loans outstanding (1)	0.08			0.06

(1)Annualized on an actual/actual basis for the three months ended March 31, 2024. Actual year-to-date for the year ended December 31, 2023.

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Asset and Deposit Growth

The Company’s assets and liabilities are comprised primarily of loans and deposits. Therefore, the ability to originate new loans and attract new deposits is fundamental to the Company’s growth.

Total assets increased to $77.0 billion at March 31, 2024 from $70.9 billion at December 31, 2023. The increase in total assets of $6.1 billion, or 8.6%, was driven by an increase in deposits, which contributed to an increase in investment securities of $3.4 billion and an increase in cash of $2.0 billion. Loans HFI increased by $403 million, or 0.8%, to $50.7 billion as of March 31, 2024, compared to $50.3 billion as of December 31, 2023. By loan type, commercial and industrial loans increased $646 million from December 31, 2023, partially offset by decreases in residential real estate and construction and land development loans of $154 million and $108 million, respectively. Loans HFS increased $439 million from $1.4 billion as of December 31, 2023 due to an increase in non-EBO and agency conforming loans.

Total deposits increased $6.9 billion, or 12.5%, to $62.2 billion as of March 31, 2024 from $55.3 billion as of December 31, 2023. By type, the increase in deposits from December 31, 2023 was driven by an increase of $3.9 billion in non-interest bearing demand deposits, $1.4 billion in savings and money market accounts, $1.0 billion in interest bearing demand deposits, and $564 million in certificates of deposit.

RESULTS OF OPERATIONS

The following table sets forth a summary financial overview:

	Three Months Ended March 31,				Increase
	2024		2023		(Decrease)
	(in millions, except per share amounts)
Consolidated Income Statement Data:
Interest income	$	1,055.0	$	968.9	$	86.1
Interest expense	456.1		359.0		97.1
Net interest income	598.9		609.9		(11.0)
Provision for credit losses	15.2		19.4		(4.2)
Net interest income after provision for credit losses	583.7		590.5		(6.8)
Non-interest income	129.9		(58.0)		187.9
Non-interest expense	481.8		347.9		133.9
Income before provision for income taxes	231.8		184.6		47.2
Income tax expense	54.4		42.4		12.0
Net income	177.4		142.2		35.2
Dividends on preferred stock	3.2		3.2		—
Net income available to common stockholders	$	174.2	$	139.0	$	35.2
Earnings per share:
Basic	$	1.61	$	1.29	$	0.32
Diluted	1.60		1.28		0.32

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Non-GAAP Financial Measures

The following discussion and analysis contains financial information determined by methods other than those prescribed by GAAP. The Company's management uses these non-GAAP financial measures in their analysis of the Company's performance. Management believes presentation of these non-GAAP financial measures provides useful supplemental information that is essential to a complete understanding of the operating results of the Company. Since the presentation of these non-GAAP performance measures and their impact differ between companies, these non-GAAP disclosures should not be viewed as a substitute for operating results determined in accordance with GAAP, nor are they necessarily comparable to non-GAAP performance measures that may be presented by other companies.

Pre-Provision Net Revenue

Banking regulations define PPNR as the sum of net interest income and non-interest income less expenses before adjusting for loss provisions. Management believes that this is an important metric as it illustrates the underlying performance of the Company, it enables investors and others to assess the Company's ability to generate capital to cover credit losses through the credit cycle, and provides consistent reporting with a key metric used by bank regulatory agencies.

The following table shows the components used in the calculation of PPNR:

	Three Months Ended March 31,
	2024		2023
	(in millions)
Total non-interest income	$	129.9	$	(58.0)
Net interest income	598.9		609.9
Net revenue	$	728.8	$	551.9
Total non-interest expense	481.8		347.9
Pre-provision net revenue	$	247.0	$	204.0
Total non-interest expense	481.8		347.9
Adjusted for:
FDIC special assessment	17.6		—
Total non-interest expense, adjusted	$	464.2	$	347.9
Pre-provision net revenue, adjusted	$	264.6	$	204.0
Less:
Provision for credit losses	15.2		19.4
Income tax expense	54.4		42.4
FDIC Special Assessment	17.6		—
Net income	$	177.4	$	142.2

Efficiency Ratio

The following table shows the components used in the calculation of the efficiency ratio, which management uses as a metric for assessing cost efficiency:

	Three Months Ended March 31,
	2024			2023
	(dollars in millions)
Total non-interest expense	$	481.8		$	347.9
Total non-interest expense, adjusted	$	464.2		$	347.9
Divided by:
Total net interest income	598.9			609.9
Plus:
Tax equivalent interest adjustment	9.6			8.8
Total non-interest income	129.9			(58.0)
	$	738.4		$	560.7
Efficiency ratio - tax equivalent basis	65.2		%	62.0		%
Efficiency ratio - tax equivalent basis, adjusted	62.9			62.0

57

Net Income, Adjusted and Earnings Per Share, Adjusted

The following table shows the components used in the calculation of earnings per share for the three months ended March 31, 2024, adjusted to exclude the FDIC special assessment, which management believes is more comparable to historical earnings trends:

Three Months Ended March 31, 2024	(in millions, except per share amounts)
Net income	$	177.4
Adjusted for:
FDIC special assessment	17.6
Tax effect of adjustments	(4.1)
Net income, adjusted	$	190.9
Dividends on preferred stock	3.2
Net income available to common stockholders, adjusted	$	187.7
FDIC special assessment	(17.6)
Tax effect of adjustments	4.1
Net income available to common stockholders	$	174.2
Weighted average number of common shares outstanding:
Basic	108.5
Diluted	109.0
Earnings per share, adjusted:
Basic, adjusted	$	1.73
Diluted, adjusted	1.72

Return on Average Equity, Adjusted and Return on Average Assets, Adjusted

The following table shows the components used in the calculation of return on average equity and return on average assets for the three months ended March 31, 2024, adjusted to exclude the FDIC special assessment, which management believes is more comparable to historical earnings trends:

Three Months Ended March 31, 2024	(dollars in millions)
Net income available to common stockholders, adjusted	$	187.7
Divided by:
Average stockholders' equity	6,184
Return on average equity, adjusted	12.4		%

Three Months Ended March 31, 2024	(dollars in millions)
Net income, adjusted	$	190.9
Divided by:
Average assets	72,681
Return on average assets, adjusted	1.06		%

58

Tangible Common Equity and Return on Average Tangible Common Equity

The following tables present financial measures related to tangible common equity. Tangible common equity represents total stockholders' equity reduced by goodwill and intangible assets and preferred stock. Management believes that tangible common equity financial measures are useful in evaluating the Company's capital strength, financial condition, and ability to manage potential losses.

	March 31, 2024			December 31, 2023
	(dollars and shares in millions)
Total stockholders' equity	$	6,172		$	6,078
Less:
Goodwill and intangible assets	666			669
Preferred stock	295			295
Total tangible common stockholders' equity	5,211			5,114
Plus: deferred tax - attributed to intangible assets	2			2
Total tangible common equity, net of tax	$	5,213		$	5,116
Total assets	$	76,989		$	70,862
Less: goodwill and intangible assets, net	666			669
Tangible assets	76,323			70,193
Plus: deferred tax - attributed to intangible assets	2			2
Total tangible assets, net of tax	$	76,325		$	70,195
Tangible common equity ratio	6.8		%	7.3		%
Common shares outstanding	110.2			109.5
Book value per common share	$	53.33		$	52.81
Tangible book value per common share, net of tax	47.30			46.72

		Three Months Ended March 31,
		2024			2023
	(dollars in millions)
Net income available to common stockholders		$	174.2		$	139.0
Divided by:
Average stockholders' equity		6,184			5,588
Less:
Average goodwill and intangible assets		668			679
Average preferred stock		295			295
Average tangible common equity		5,221			4,614
Return on average tangible common equity		13.4		%	12.2		%
Net income available to common stockholders, adjusted		$	187.7		$	139.0
Average tangible common equity		5,221			4,614
Return on average tangible common equity, adjusted		14.5		%	12.2		%

59

Regulatory Capital

The following table presents certain financial measures related to regulatory capital under Basel III, which includes CET1 and total capital. The FRB and other banking regulators use CET1 and total capital as a basis for assessing a bank's capital adequacy; therefore, management believes it is useful to assess financial condition and capital adequacy using this same basis. Specifically, the total capital ratio takes into consideration the risk levels of assets and off-balance sheet financial instruments. In addition, management believes that the classified assets to CET1 plus allowance measure is an important regulatory metric for assessing asset quality.

As permitted by the regulatory capital rules, the Company elected the CECL transition option that delayed the estimated impact on regulatory capital resulting from the adoption of CECL over a five-year transition period ending December 31, 2024. Accordingly, beginning in 2024, capital ratios and amounts include a 25% capital benefit that resulted from the increased ACL related to the adoption of ASC 326.

	March 31, 2024			December 31, 2023
	(dollars in millions)
Common equity tier 1:
Common equity	$	5,890		$	5,807
Less:
Non-qualifying goodwill and intangibles	655			658
Disallowed deferred tax asset	6			3
AOCI related adjustments	(560)			(516)
Unrealized gain on changes in fair value liabilities	2			3
Common equity tier 1	$	5,787		$	5,659
Divided by: Risk-weighted assets	$	52,545		$	52,517
Common equity tier 1 ratio	11.0		%	10.8		%
Common equity tier 1	$	5,787		$	5,659
Plus: Preferred stock and trust preferred securities	376			376
Tier 1 capital	$	6,163		$	6,035
Divided by: Tangible average assets	$	72,766		$	70,295
Tier 1 leverage ratio	8.5		%	8.6		%
Total capital:
Tier 1 capital	$	6,163		$	6,035
Plus:
Subordinated debt	818			818
Adjusted allowances for credit losses	368			348
Tier 2 capital	1,186			1,166
Total capital	$	7,349		$	7,201
Total capital ratio	14.0		%	13.7		%
Classified assets to tier 1 capital plus allowance:
Classified assets	$	781		$	673
Divided by: Tier 1 capital	6,163			6,035
Plus: Adjusted allowances for credit losses	368			348
Total Tier 1 capital plus adjusted allowances for credit losses	$	6,531		$	6,383
Classified assets to tier 1 capital plus allowance	12.0		%	10.5		%

60

Net Interest Margin

The net interest margin is reported on a TEB. A tax equivalent adjustment is added to reflect interest earned on certain securities and loans that are exempt from federal and state income tax. The following tables set forth the average balances, interest income, interest expense, and average yield (on a fully TEB) for the periods indicated:

	Three Months Ended March 31,
	2024						2023
	Average Balance		Interest		Average Yield / Cost		Average Balance		Interest		Average Yield / Cost
	(dollars in millions)
Interest earning assets
Loans held for sale	$	2,416	$	39.1	6.51	%	$	2,153	$	31.3	5.90	%
Loans held for investment:
Commercial and industrial	18,745		345.7		7.48		20,481		368.2		7.35
CRE - non-owner-occupied	9,468		185.1		7.87		9,520		169.4		7.22
CRE - owner-occupied	1,808		26.8		6.06		1,809		24.6		5.62
Construction and land development	4,922		117.1		9.57		4,230		93.3		8.94
Residential real estate	14,722		157.0		4.29		15,839		144.7		3.71
Consumer	61		1.1		7.28		73		1.2		6.82
Total loans HFI (1), (2), (3)	49,726		832.8		6.77		51,952		801.4		6.28
Securities:
Securities - taxable	10,717		121.1		4.54		6,658		75.2		4.58
Securities - tax-exempt	2,205		22.9		5.24		2,117		20.9		5.00
Total securities (1)	12,922		144.0		4.66		8,775		96.1		4.68
Cash and other	2,953		39.1		5.33		3,331		40.1		4.88
Total interest earning assets	68,017		1,055.0		6.29		66,211		968.9		5.99
Non-interest earning assets
Cash and due from banks	285						265
Allowance for credit losses	(349)						(315)
Bank owned life insurance	186						182
Other assets	4,542						4,931
Total assets	$	72,681					$	71,274
Interest-bearing liabilities
Interest-bearing deposits:
Interest-bearing transaction accounts	$	16,348	$	122.0	3.00	%	$	10,534	$	68.2	2.63	%
Savings and money market accounts	15,247		129.9		3.43		18,066		115.5		2.59
Certificates of deposit	10,129		128.7		5.11		5,520		47.9		3.52
Total interest-bearing deposits	41,724		380.6		3.67		34,120		231.6		2.75
Short-term borrowings	3,715		53.8		5.82		7,288		87.5		4.87
Long-term debt	444		12.2		11.06		1,275		30.6		9.73
Qualifying debt	895		9.5		4.28		893		9.3		4.24
Total interest-bearing liabilities	46,778		456.1		3.92		43,576		359.0		3.34
Interest cost of funding earning assets					2.69						2.20
Non-interest-bearing liabilities
Non-interest-bearing demand deposits	18,183						20,521
Other liabilities	1,536						1,589
Stockholders’ equity	6,184						5,588
Total liabilities and stockholders' equity	$	72,681					$	71,274
Net interest income and margin (4)			$	598.9	3.60	%			$	609.9	3.79	%

(1)Yields on loans and securities have been adjusted to a TEB. The taxable-equivalent adjustment was $9.6 million and $8.8 million for the three months ended March 31, 2024 and 2023, respectively.

(2)Included in the yield computation are net loan fees of $33.1 million and $35.6 million for the three months ended March 31, 2024 and 2023, respectively.

(3)Includes non-accrual loans.

(4)Net interest margin is computed by dividing net interest income by total average earning assets, annualized on an actual/actual basis.

61

	Three Months Ended March 31,
	2024 versus 2023
	Increase (Decrease) Due to Changes in (1)
	Volume		Rate		Total
	(in millions)
Interest income:
Loans held for sale	$	4.3	$	3.5	$	7.8
Loans:
Commercial and industrial	(32.0)		9.5		(22.5)
CRE - non-owner occupied	(1.0)		16.7		15.7
CRE - owner-occupied	—		2.2		2.2
Construction and land development	16.5		7.3		23.8
Residential real estate	(11.9)		24.2		12.3
Consumer	(0.2)		0.1		(0.1)
Total loans HFI	(28.6)		60.0		31.4
Securities:
Securities - taxable	45.9		—		45.9
Securities - tax-exempt	0.9		1.1		2.0
Total securities	46.8		1.1		47.9
Cash and other	(5.0)		4.0		(1.0)
Total interest income	17.5		68.6		86.1
Interest expense:
Interest-bearing transaction accounts	43.4		10.4		53.8
Savings and money market accounts	(24.0)		38.4		14.4
Certificates of deposit	58.6		22.2		80.8
Total deposits	78.0		71.0		149.0
Short-term borrowings	(51.7)		18.0		(33.7)
Long-term debt	(22.8)		4.4		(18.4)
Qualifying debt	—		0.2		0.2
Total interest expense	3.5		93.6		97.1
Net change	$	14.0	$	(25.0)	$	(11.0)

(1)    Changes attributable to both volume and rate are designated as volume changes.

Comparison of interest income, interest expense and net interest margin

The Company's primary source of revenue is interest income. For the three months ended March 31, 2024, interest income was $1.1 billion, an increase of $86.1 million, or 8.9%, compared to $968.9 million for the three months ended March 31, 2023. This increase was primarily the result of a $47.9 million increase in interest income from investment securities due to an increase in the average investment balance of $4.1 billion and a $31.4 million increase in interest income from loans HFI that was driven primarily by higher yields and partially offset by lower average HFI loan balances of $2.2 billion.

For the three months ended March 31, 2024, interest expense was $456.1 million, an increase of $97.1 million, compared to $359.0 million for the three months ended March 31, 2023. The increase in interest expense was due to an increase in interest expense on deposits of $149.0 million driven by a $7.6 billion increase in the average interest-bearing deposit balance and increased interest rates, partially offset by a $52.1 million decrease in interest expense on borrowings resulting from a decrease in average borrowing balances of $4.4 billion.

For the three months ended March 31, 2024, net interest income was $598.9 million, a decrease of $11.0 million, or 1.8%, compared to $609.9 million for the three months ended March 31, 2023. The decrease in net interest income was driven by the higher rate environment and reflects a $3.2 billion increase in average interest-bearing liabilities, partially offset by an increase in yields on interest-earning assets. The decrease in net interest margin of 19 basis points to 3.60% is largely the result of an increase in both the rates and balances of deposits, partially offset by higher yields on HFI loans and a decrease in borrowings compared to the same period in 2023.

62

Provision for Credit Losses

The provision for credit losses in each period is reflected as a reduction in earnings for that period and includes amounts related to funded loans, unfunded loan commitments, and investment securities. The provision is equal to the amount required to maintain the ACL at a level that is adequate to absorb estimated lifetime credit losses inherent in the loan and investment securities portfolios based on remaining contractual maturity, adjusted for estimated prepayments as of each period end. The Company's CECL models incorporate historical experience, current conditions, and reasonable and supportable forecasts in measuring expected credit losses. For the three months ended March 31, 2024, the Company recorded a provision for credit losses of $15.2 million, compared to $19.4 million for the three months ended March 31, 2023. The provision for credit losses for the three months ended March 31, 2024 is primarily reflective of loan growth, net charge-offs of $9.8 million, and a stable economic outlook.

Non-interest Income

The following table presents a summary of non-interest income: 

	Three Months Ended March 31,				Increase (Decrease)
	2024		2023
	(in millions)
Net loan servicing revenue	$	46.4	$	41.9	$	4.5
Net gain on loan origination and sale activities	45.3		31.4		13.9
Income from equity investments	17.1		1.4		15.7
Service charges and fees	9.9		9.5		0.4
Commercial banking related income	6.5		6.2		0.3
Fair value gain (loss) adjustments, net	0.3		(147.8)		148.1
(Loss) gain on recovery from credit guarantees	(0.5)		3.3		(3.8)
Loss on sales of investment securities	(0.9)		(12.5)		11.6
Other income	5.8		8.6		(2.8)
Total non-interest income	$	129.9	$	(58.0)	$	187.9

Total non-interest income for the three months ended March 31, 2024 compared to the same period in 2023 increased $187.9 million. The increase in non-interest income from the three months ended March 31, 2023 was primarily driven by a net fair value loss adjustment of $147.8 million recognized during the three months ended March 31, 2023 due to the Company's balance sheet repositioning in the prior year that did not reoccur. Also contributing to the increase in non-interest income was an increase in income from equity investments of $15.7 million and a net increase in mortgage banking income as net gain on loan origination and sale activities increased $13.9 million from higher production volume and spreads.

63

Non-interest Expense

The following table presents a summary of non-interest expense:

		Three Months Ended March 31,				Increase (Decrease)
		2024		2023
	(in millions)
Salaries and employee benefits		$	154.9	$	148.9	$	6.0
Deposit costs		137.0		86.9		50.1
Insurance		58.9		15.7		43.2
Data processing		36.0		26.4		9.6
Legal, professional, and directors' fees		30.1		23.1		7.0
Occupancy		17.5		16.5		1.0
Loan servicing expenses		15.0		13.8		1.2
Business development and marketing		5.5		5.2		0.3
Loan acquisition and origination expenses		4.8		4.4		0.4
Gain on extinguishment of debt		—		(12.7)		12.7
Other expense		22.1		19.7		2.4
Total non-interest expense		$	481.8	$	347.9	$	133.9

Total non-interest expense for the three months ended March 31, 2024 increased $133.9 million compared to the same period in 2023. The increase in non-interest expense was primarily driven by an increase in deposit and insurance costs. The increase in deposit costs from the prior year relates primarily to higher average ECR balances and rates, while the increase in insurance costs is due to elevated insured and brokered deposit levels and a $17.6 million charge related to the FDIC special assessment.

Income Taxes

The Company's effective tax rate was 23.5% and 23.0% for the three months ended March 31, 2024 and 2023, respectively. The increase in the effective tax rate was primarily due to an increase in nondeductible insurance premiums and shortfalls from stock compensation expense in 2024.

64

Business Segment Results

The Company's reportable segments are aggregated with a focus on products and services offered and consist of three reportable segments:

•Commercial: provides commercial banking and treasury management products and services to small and middle-market businesses, specialized banking services to sophisticated commercial institutions and investors within niche industries, as well as financial services to the real estate industry.

•Consumer Related: offers consumer banking services, such as mortgage banking and commercial banking services to enterprises in consumer-related sectors.

•Corporate & Other: consists of the Company's investment portfolio, Corporate borrowings and other related items, income and expense items not allocated to other reportable segments, and inter-segment eliminations.

The following tables present selected reportable segment information:

	Consolidated Company		Commercial		Consumer Related		Corporate & Other
At March 31, 2024	(in millions)
Loans HFI, net of deferred loan fees and costs	$	50,700	$	29,642	$	21,058	$	—
Deposits	62,228		25,146		30,481		6,601
At December 31, 2023
Loans HFI, net of deferred loan fees and costs	$	50,297	$	29,136	$	21,161	$	—
Deposits	55,333		23,897		24,925		6,511

Three Months Ended March 31, 2024	(in millions)
Pre-tax income (loss)	$	231.8	$	143.6	$	92.8	$	(4.6)
Three Months Ended March 31, 2023
Pre-tax income (loss)	$	184.6	$	159.4	$	56.8	$	(31.6)

BALANCE SHEET ANALYSIS

Total assets increased $6.1 billion to $77.0 billion at March 31, 2024, compared to $70.9 billion at December 31, 2023. The increase in total assets was driven by an increase in investment securities of $3.4 billion as well an increase in cash of $2.0 billion. Loans HFI increased by $403 million, or 0.8%, to $50.7 billion as of March 31, 2024, compared to $50.3 billion as of December 31, 2023. The increase in loans HFI from December 31, 2023 was driven by a $646 million increase in commercial and industrial loans from December 31, 2023, partially offset by decreases in residential real estate and construction and land development loans of $154 million and $108 million, respectively. Loans HFS increased $439 million from $1.4 billion as of December 31, 2023 due to an increase in non-EBO and agency conforming loans.

Total liabilities increased $6.0 billion to $70.8 billion at March 31, 2024, compared to $64.8 billion at December 31, 2023. The increase in liabilities is due primarily to an increase in total deposits of $6.9 billion, or 12.5%, to $62.2 billion. By type, the increase in deposits from December 31, 2023 was driven by increases of $3.9 billion in non-interest bearing demand deposits, $1.4 billion in savings and money market accounts, $1.0 billion in interest bearing demand deposits, and $564 million in certificates of deposit. Other borrowings decreased $1.0 billion from December 31, 2023 primarily due to a decrease in short-term borrowings.

Total stockholders’ equity of $6.2 billion at March 31, 2024 increased by $94 million, or 1.5%, from December 31, 2023. The increase in stockholders' equity is primarily a function of net income, offset by quarterly dividends to common and preferred stockholders, and unrealized fair value losses on AFS securities, recorded net of tax in other comprehensive income.

Investment securities

Debt securities are classified at the time of acquisition as either HTM, AFS, or trading based upon various factors, including asset/liability management strategies, liquidity and profitability objectives, and regulatory requirements. HTM securities are carried at amortized cost, adjusted for amortization of premiums or accretion of discounts. AFS securities are debt securities that may be sold prior to maturity based upon asset/liability management decisions. Investment securities classified as AFS are carried at fair value with unrealized gains or losses on these securities recorded in AOCI in stockholders’ equity, net of tax.

65

Amortization of premiums or accretion of discounts on MBS is periodically adjusted for estimated prepayments. Trading securities are reported at fair value, with unrealized gains and losses on these securities included in current period earnings.

The Company's investment securities portfolio is utilized as collateral for borrowings, required collateral for public deposits and repurchase agreements, and to manage liquidity, capital, and interest rate risk.

The following table summarizes the carrying value of the Company's investment securities portfolio: 

	March 31, 2024		December 31, 2023		Increase (Decrease)
	(in millions)
Debt securities
U.S. Treasury securities	$	7,011	$	4,853	$	2,158
Residential MBS issued by GSEs	4,536		1,972		2,564
Tax-exempt	2,127		2,101		26
Private label residential MBS	1,274		1,303		(29)
Commercial MBS issued by GSEs	586		530		56
Corporate debt securities	367		367		—
CLO	—		1,399		(1,399)
Other	69		69		—
Total debt securities	$	15,970	$	12,594	$	3,376
Equity securities
Preferred stock	$	105	$	100	$	5
CRA investments	25		26		(1)
Total equity securities	$	130	$	126	$	4

Loans HFS

The Company purchases and originates residential mortgage loans through its AmeriHome mortgage banking business channel that are held for sale or securitization. As of March 31, 2024, loans HFS totaled $1.8 billion, compared to $1.4 billion at December 31, 2023, an increase of $439 million primarily related to an increase in non-EBO and agency-conforming loans.

Loans HFI

The table below summarizes the distribution of the Company’s held for investment loan portfolio: 

	March 31, 2024		December 31, 2023		Increase (Decrease)
	(in millions)
Warehouse lending	$	6,915	$	6,618	$	297
Municipal & nonprofit	1,622		1,554		68
Tech & innovation	2,941		2,808		133
Equity fund resources	695		845		(150)
Other commercial and industrial	7,754		7,452		302
CRE - owner occupied	1,707		1,658		49
Hotel franchise finance	3,556		3,855		(299)
Other CRE - non-owner occupied	6,365		5,974		391
Residential	13,078		13,287		(209)
Residential - EBO	1,171		1,223		(52)
Construction and land development	4,746		4,862		(116)
Other	150		161		(11)
Total loans HFI	50,700		50,297		403
Allowance for credit losses	(340)		(337)		(3)
Total loans HFI, net of allowance	$	50,360	$	49,960	$	400

Loans classified as HFI are stated at the amount of unpaid principal, adjusted for net deferred fees and costs, premiums and discounts on acquired and purchased loans, and an ACL. Net deferred loan fees of $102 million and $108 million reduced the carrying value of loans as of March 31, 2024 and December 31, 2023, respectively. Net unamortized purchase premiums on acquired and purchased loans of $175 million and $177 million increased the carrying value of loans as of March 31, 2024 and December 31, 2023, respectively.

66

Concentrations of Lending Activities

The Company monitors concentrations of lending activities at the product and borrower relationship level. As of March 31, 2024 and December 31, 2023, no borrower relationships at both the commitment and funded loan level exceeded 5% of total loans HFI.

Commercial and industrial loans made up 39% and 38% of total loans HFI as of March 31, 2024 and December 31, 2023, respectively.

In addition, the Company's loan portfolio includes significant credit exposure to the CRE market as CRE related loans accounted for approximately 32% and 33% of total loans at March 31, 2024 and December 31, 2023 respectively. Non-owner occupied CRE loans are CRE loans for which the primary source of repayment is rental income generated from the collateral property. Owner occupied CRE loans are loans secured by owner occupied non-farm nonresidential properties for which the primary source of repayment (more than 50%) is the cash flow from the ongoing operations and activities conducted by the borrower who owns the property. These CRE loans are secured by multi-family residential properties, professional offices, industrial facilities, retail centers, hotels, and other commercial properties.

The following tables present the composition by property type and weighted average LTV of the Company’s CRE non-owner occupied loans:

	March 31, 2024
	Amount		Percent of CRE-Non OO		Percent of Total HFI Loans		Weighted Average LTV (1)
	(dollars in millions)
Hotel	$	3,933	40.8	%	7.8	%	47.8	%
Office	2,488		25.8		4.9		59.2
Retail	744		7.7		1.5		58.2
Multifamily	652		6.8		1.3		48.3
Industrial	606		6.3		1.2		42.0
Time share	373		3.9		0.7		33.7
Senior care	131		1.4		0.3		40.9
Medical	128		1.3		0.3		51.8
Other	582		6.0		1.1		42.7
Total CRE - non-owner occupied	$	9,637	100.0	%	19.0	%	50.3	%

(1)    The weighted average LTVs in the above table are based on the most recent available information, if current appraisals are not available.

	December 31, 2023
	Amount		Percent of CRE-Non OO		Percent of Total HFI Loans		Weighted Average LTV (1)
	(dollars in millions)
Hotel	$	4,235	43.9	%	8.4	%	48.1	%
Office	2,358		24.4		4.7		58.8
Retail	753		7.8		1.5		61.0
Multifamily	566		5.9		1.1		49.7
Industrial	565		5.8		1.1		50.4
Time share	378		3.9		0.8		34.9
Senior care	160		1.7		0.3		41.8
Medical	124		1.3		0.2		51.2
Other	511		5.3		1.0		43.4
Total CRE - non-owner occupied	$	9,650	100.0	%	19.2	%	51.1	%

(1)    The weighted average LTVs in the above table are based on the most recent available information, if current appraisals are not available.

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The following table presents the Company’s CRE non-owner occupied loans by origination year as of March 31, 2024:

	(in millions)
2024	$	248
2023	915
2022	3,291
2021	1,808
2020	793
Prior	2,582
Total	$	9,637

The following table presents the scheduled maturities of the Company’s CRE non-owner occupied loans as of March 31, 2024:

	(in millions)
2024	$	1,616
2025	1,986
2026	2,132
2027	2,013
2028	850
Thereafter	1,040
Total	$	9,637

Approximately $2.5 billion, or 4.9%, of total loans HFI consisted of CRE non-owner occupied office loans as of March 31, 2024, compared to $2.4 billion, or 4.7%, as of December 31, 2023. Of the non-owner occupied office loan balance as of March 31, 2024, $266 million is scheduled to mature in the remainder of 2024. These office loans primarily consist of shorter-term bridge loans that enable borrowers to reposition or redevelop projects with more modern standards attractive to in-office employers in today’s environment, including enhanced on-site amenities. The vast majority of these projects are located in suburban locations in the Company's core footprint states (Arizona, California, and Nevada), with central business district and midtown exposure totaling approximately 2% and 10% of office loans as of March 31, 2024, respectively.

The office loan portfolio largely consists of value-add loans that require significant up-front cash equity contributions from institutional sponsors and large regional and national developers. The properties underlying these loans have stable business trends and low vacancy rates. To a large extent, the financing structures of these loans do not carry junior liens or mezzanine debt, which enables maximum flexibility when working with clients and sponsors. In addition to adhering to conservative underwriting standards, asset-specific credit risk is mitigated through continued sponsor support of projects by re-appraisal rights of the Company, re-margining requirements and ongoing debt service, and debt yield covenants.

As of March 31, 2024 and December 31, 2023, 16% of the Company's CRE loans, excluding construction and land loans, were owner occupied, with substantially all of these loans secured by first liens and had an initial loan-to-value ratio of generally not more than 75%.

Non-performing Assets

Total non-performing loans increased $124 million to $534 million at March 31, 2024, from $410 million at December 31, 2023.

	March 31, 2024			December 31, 2023
	(dollars in millions)
Total nonaccrual loans (1)	$	399		$	273
Loans past due 90 days or more on accrual status (2)	6			42
Accruing restructured loans	129			95
Total nonperforming loans	$	534		$	410
Other assets acquired through foreclosure, net	$	8		$	8
Nonaccrual loans to funded loans HFI	0.79		%	0.54		%
Loans past due 90 days or more on accrual status to funded loans HFI	0.01			0.08

(1)Includes loan modifications to borrowers experiencing financial difficulty of $129 million and $111 million at March 31, 2024 and December 31, 2023, respectively.

(2)Excludes government guaranteed residential mortgage loans of $349 million and $399 million at March 31, 2024 and December 31, 2023, respectively.

Interest income that would have been recorded under the original terms of nonaccrual loans was $4.9 million and $0.8 million for the three months ended March 31, 2024 and 2023, respectively.

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The composition of nonaccrual loans HFI by loan portfolio segment were as follows: 

	March 31, 2024
	Nonaccrual Balance		Percent of Nonaccrual Balance		Percent of Total Loans HFI
	(dollars in millions)
Municipal & nonprofit	$	5	1.3	%	0.01	%
Tech & innovation	62		15.5		0.12
Other commercial and industrial	35		8.8		0.07
CRE - owner occupied	10		2.5		0.02
Hotel franchise finance	12		3.0		0.02
Other CRE - non-owner occupied	175		43.8		0.35
Residential	79		19.8		0.16
Construction and land development	20		5.0		0.04
Other	1		0.3		0.00
Total non-accrual loans	$	399	100.0	%	0.79	%

	December 31, 2023
	Nonaccrual Balance		Percent of Nonaccrual Balance		Percent of Total Loans HFI
	(dollars in millions)
Municipal & nonprofit	$	6	2.2	%	0.01	%
Tech & innovation	33		12.1		0.06
Other commercial and industrial	53		19.4		0.11
CRE - owner occupied	9		3.3		0.02
Other CRE - non-owner occupied	83		30.4		0.16
Residential	70		25.6		0.14
Construction and land development	19		7.0		0.04
Total non-accrual loans	$	273	100.0	%	0.54	%

Restructurings for Borrowers Experiencing Financial Difficulty

The following tables present loan modifications during the period to borrowers experiencing financial difficulty:

	Amortized Cost Basis at March 31, 2024
	Payment Delay and Term Extension		Term Extension		Payment Delay		Total		% of Total Class of Financing Receivable
Three Months Ended	(in millions)
Tech & innovation	$	—	$	—	$	30	$	30	1.0	%
Other commercial and industrial	—		8		—		8		0.1
CRE - owner occupied	—		31		—		31		1.8
Construction and land development	—		39		—		39		0.8
Total	$	—	$	78	$	30	$	108	0.2	%

	Amortized Cost Basis at March 31, 2023
	Payment Delay and Term Extension		Term Extension		Payment Delay		Total		% of Total Class of Financing Receivable
Three Months Ended	(dollars in millions)
Tech & innovation	$	2	$	—	$	5	$	7	0.3	%
Hotel franchise finance	—		18		—		18		0.5
Residential	—		—		1		1		0.0
Total	$	2	$	18	$	6	$	26	0.1	%

The performance of these modified loans is monitored for 12 months following the modification. As of March 31, 2024, modified loans of $129 million were current with contractual payments and $129 million were on nonaccrual status. As of December 31, 2023, modified loans of $95 million were current with contractual payments and $111 million were on nonaccrual status.

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In the normal course of business, the Company also modifies EBO loans, which are delinquent FHA, VA, or USDA insured or guaranteed loans repurchased under the terms of the GNMA MBS program and can be repooled or resold when loans are brought current. During the three months ended March 31, 2024 and 2023, the Company completed modifications of EBO loans with an amortized cost of $90 million and $57 million, respectively. These modifications were largely payment delays and term extensions. Certain of these loans were repooled or resold after modification and are no longer included in the pool of loan modifications being monitored for future performance. As of March 31, 2024, modified EBO loans consisted of $38 million in loans that were current to 89 days delinquent and $12 million in loans greater than 90 days delinquent. As of December 31, 2023, modified EBO loans consisted of $26 million in loans that were current to 89 days delinquent and $12 million in loans greater than 90 days delinquent.

Allowance for Credit Losses on Loans HFI

The ACL consists of an ACL on loans and on unfunded loan commitments. The ACL on AFS and HTM securities is estimated separately from loans and is discussed within the Investment Securities section.

The following table summarizes the allocation of the ACL on loans HFI by loan portfolio segment:

	March 31, 2024						December 31, 2023
	Allowance for credit losses		Percent of total allowance for credit losses		Percent of loan type to total loans HFI		Allowance for credit losses		Percent of total allowance for credit losses		Percent of loan type to total loans HFI
	(dollars in millions)
Warehouse lending	$	7.3	2.1	%	13.6	%	$	5.8	1.7	%	13.2	%
Municipal & nonprofit	13.9		4.1		3.2		14.7		4.4		3.1
Tech & innovation	48.0		14.1		5.8		42.1		12.5		5.6
Equity fund resources	1.2		0.4		1.4		1.3		0.4		1.7
Other commercial and industrial	67.1		19.7		15.3		81.4		24.2		14.8
CRE - owner occupied	6.2		1.8		3.4		6.0		1.8		3.3
Hotel franchise finance	35.8		10.5		7.0		33.4		9.9		7.6
Other CRE - non-owner occupied	104.7		30.8		12.5		96.0		28.5		11.9
Residential	22.1		6.5		25.8		23.1		6.9		26.4
Residential - EBO	—		—		2.3		—		—		2.4
Construction and land development	31.9		9.4		9.4		30.4		9.0		9.6
Other	2.1		0.6		0.3		2.5		0.7		0.4
Total	$	340.3	100.0	%	100.0	%	$	336.7	100.0	%	100.0	%

During the three months ended March 31, 2024 and 2023, net loan charge-offs to average loans outstanding were 0.08% and 0.05%, respectively.

In addition to the ACL on funded loans HFI, the Company maintains a separate ACL related to off-balance sheet credit exposures, including unfunded loan commitments. This allowance balance totaled $33 million and $32 million at March 31, 2024 and December 31, 2023, respectively, and is included in Other liabilities on the Consolidated Balance Sheet.

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Problem Loans

The Company classifies loans consistent with federal banking regulations using a nine category grading system. The following table presents information regarding potential and actual problem loans, consisting of loans graded as Special Mention, Substandard, Doubtful, and Loss, but which are still performing: 

	March 31, 2024
	Number of Loans	Problem Loan Balance		Percent of Problem Loan Balance		Percent of Total Loans HFI
	(dollars in millions)
Warehouse lending	1	$	23	4.8	%	0.04	%
Municipal & nonprofit	2	18		3.7		0.04
Tech & innovation	18	58		12.0		0.11
Other commercial and industrial	49	4		0.8		0.01
CRE - owner occupied	10	5		1.0		0.01
Hotel franchise finance	7	100		20.7		0.20
Other CRE - non-owner occupied	9	184		38.1		0.36
Residential	141	81		16.8		0.16
Construction and land development	2	6		1.3		0.01
Other	24	4		0.8		0.01
Total	263	$	483	100.0	%	0.95	%

	December 31, 2023
	Number of Loans	Problem Loan Balance		Percent of Problem Loan Balance		Percent of Total Loans HFI
	(dollars in millions)
Warehouse lending	1	$	26	3.6	%	0.05	%
Municipal & nonprofit	2	18		2.5		0.04
Tech & innovation	14	49		6.8		0.10
Other commercial and industrial	50	95		13.2		0.19
CRE - owner occupied	9	3		0.4		0.01
Hotel franchise finance	9	203		28.3		0.40
Other CRE - non-owner occupied	15	251		35.0		0.50
Residential	143	72		10.0		0.14
Construction and land development	1	1		0.1		0.00
Other	20	1		0.1		0.00
Total	264	$	719	100.0	%	1.43	%

Mortgage Servicing Rights

The fair value of the Company's MSRs related to residential mortgage loans totaled $1.2 billion and $1.1 billion as of March 31, 2024 and December 31, 2023, respectively. The increase in MSRs is primarily related to new production of MSRs and valuation gains, partially offset by sales.

The following is a summary of the UPB of loans underlying the Company's MSR portfolio by type:

	March 31, 2024		December 31, 2023
	(in millions)
FNMA and FHLMC	$	41,157	$	46,840
GNMA	22,352		19,848
Non-agency	2,111		1,959
Total unpaid principal balance of loans	$	65,620	$	68,647

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Goodwill and Other Intangible Assets

Goodwill represents the excess consideration paid for net assets acquired in a business combination over their fair value. Goodwill and other intangible assets acquired in a business combination that are determined to have an indefinite useful life are not subject to amortization, but are subsequently evaluated for impairment at least annually. The Company has goodwill and intangible assets totaling $666 million and $669 million at March 31, 2024 and December 31, 2023, respectively.

The Company performs its annual goodwill and intangible assets impairment tests as of October 1 each year, or more often if events or circumstances indicate that the carrying value may not be recoverable. During the three months ended March 31, 2024 there were no events or circumstances that indicated an interim impairment test of goodwill or other intangible assets was necessary. For the three months ended March 31, 2023, the Company evaluated whether the effects from the bank failures in 2023 gave rise to a triggering event and elected to perform a Step 0 goodwill impairment assessment, which included assessing the financial performance of the Company and analyzing qualitative factors applicable to the Company. Based on this assessment, the Company determined that it was more likely than not the fair value of the Company and its reporting units exceeded their respective carrying values as of March 31, 2023.

Deferred Tax Assets

As of March 31, 2024, the net DTA balance totaled $300 million, an increase of $13 million from $287 million at December 31, 2023. This overall increase in the net DTA was primarily the result of a decrease in the fair market value of AFS securities.

Deposits

Deposits are the primary source for funding the Company's asset growth. Total deposits increased to $62.2 billion at March 31, 2024, from $55.3 billion at December 31, 2023, an increase of $6.9 billion, or 12.5%. By deposit type, the increase in deposits is attributable to increases of $3.9 billion in non-interest bearing demand deposits, $1.4 billion in savings and money market accounts, $1.0 billion in interest bearing demand deposits, and $564 million in certificates of deposit.

WAB is a participant in the IntraFi Network, a network that offers deposit placement services such as CDARS and ICS, which offer products that qualify large deposits for FDIC insurance. At March 31, 2024, the Company had $14.5 billion of these reciprocal deposits, compared to $13.3 billion at December 31, 2023. At March 31, 2024 and December 31, 2023, the Company also had wholesale brokered deposits of $6.5 billion and $6.6 billion, respectively.

In addition, deposits for which the Company provides account holders with earnings credits or referral fees totaled $22.2 billion and $17.8 billion at March 31, 2024 and December 31, 2023, respectively. The Company incurred $131.2 million and $85.6 million in deposit related costs on these deposits during the three months ended March 31, 2024 and 2023, respectively. These costs are reported as Deposit costs in non-interest expense. The increase in these costs from the prior year is due to an increase in earnings credit rates as well as an increase in average deposit balances eligible for earnings credits or referral fees.

The average balances and weighted average rates paid on deposits are presented below:

	Three Months Ended March 31,
	2024				2023
	Average Balance		Rate		Average Balance		Rate
	(dollars in millions)
Interest-bearing transaction accounts	$	16,348	3.00	%	$	10,534	2.63	%
Savings and money market accounts	15,247		3.43		18,066		2.59
Certificates of deposit	10,129		5.11		5,520		3.52
Total interest-bearing deposits	41,724		3.67		34,120		2.75
Non-interest-bearing demand deposits	18,183		—		20,521		—
Total deposits	$	59,907	2.56	%	$	54,641	1.72	%

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Other Borrowings

Short-Term Borrowings

The Company utilizes short-term borrowed funds to support short-term liquidity needs. The majority of these short-term borrowed funds consist of advances from the FHLB, repurchase agreements, and federal funds purchased from correspondent banks or the FHLB. The Company’s borrowing capacity with the FHLB is determined based on collateral pledged, generally consisting of securities and loans. In addition, the Company has repurchase facilities, collateralized by securities and EBO loans, including assets sold under agreements to repurchase, which are reflected at the amount of cash received in connection with the transaction, and may require additional collateral based on the fair value of the underlying assets. Total short-term borrowings decreased $1.0 billion to $5.8 billion at March 31, 2024 from $6.8 billion at December 31, 2023. The decrease was driven by decreases in FHLB advances of $450 million, repurchase agreements of $374 million, and federal funds purchased of $175 million.

Long-Term Borrowings

The Company's long-term borrowings consist of credit linked notes, inclusive of issuance costs. At March 31, 2024, the carrying value of long-term borrowings was $441 million, compared to $446 million at December 31, 2023.

Qualifying Debt

Qualifying debt consists of subordinated debt and junior subordinated debt, inclusive of issuance costs and fair market value adjustments. At March 31, 2024, the carrying value of qualifying debt was $896 million, compared to $895 million at December 31, 2023.

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Capital Resources

The Company and the Bank are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements could trigger certain mandatory or discretionary actions that, if undertaken, could have a direct material effect on the Company’s business and financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company and the Bank must meet specific capital guidelines that involve quantitative measures of their assets, liabilities, and certain off-balance sheet items (discussed in "Note 14. Commitments and Contingencies" to the Unaudited Consolidated Financial Statements) as calculated under regulatory accounting practices. The capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings, and other factors.

As permitted by the regulatory capital rules, the Company elected the CECL transition option that delayed the estimated impact on regulatory capital resulting from the adoption of CECL over a five-year transition period ending December 31, 2024. Accordingly, beginning in 2024, capital ratios and amounts include a 25% capital benefit that resulted from the increased ACL related to the adoption of ASC 326.

As of March 31, 2024 and December 31, 2023, the Company and the Bank exceeded the capital levels necessary to be classified as well-capitalized, as defined by the various banking agencies. The actual capital amounts and ratios for the Company and the Bank are presented in the following tables:

	Total Capital		Tier 1 Capital		Risk-Weighted Assets		Tangible Average Assets		Total Capital Ratio		Tier 1 Capital Ratio		Tier 1 Leverage Ratio		Common Equity Tier 1
	(dollars in millions)
March 31, 2024
WAL	$	7,349	$	6,163	$	52,545	$	72,766	14.0	%	11.7	%	8.5	%	11.0	%
WAB	6,915		6,323		52,524		72,748		13.2		12.0		8.7		12.0
Well-capitalized ratios									10.0		8.0		5.0		6.5
Minimum capital ratios									8.0		6.0		4.0		4.5
December 31, 2023
WAL	$	7,201	$	6,035	$	52,517	$	70,295	13.7	%	11.5	%	8.6	%	10.8	%
WAB	6,802		6,229		52,508		70,347		13.0		11.9		8.9		11.9
Well-capitalized ratios									10.0		8.0		5.0		6.5
Minimum capital ratios									8.0		6.0		4.0		4.5

The Company and the Bank are also subject to liquidity and other regulatory requirements as administered by the federal banking agencies. These agencies have broad powers and at their discretion, could limit or prohibit the Company's payment of dividends, payment of certain debt service and issuance of capital stock and debt as they deem appropriate and as such, actions by the agencies could have a direct material effect on the Company’s business and financial statements.

The Company is also required to maintain specified levels of capital to remain in good standing with certain federal government agencies, including FNMA, FHLMC, GNMA, and HUD. These capital requirements are generally tied to the unpaid balances of loans included in the Company's servicing portfolio or loan production volume. Noncompliance with these capital requirements can result in various remedial actions up to, and including, removing the Company's ability to sell loans to and service loans on behalf of the respective agency. The Company believes that it is in compliance with these requirements as of March 31, 2024.

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Critical Accounting Estimates

Critical accounting estimates are defined as those that are reflective of significant judgments and uncertainties and could potentially result in materially different results under different assumptions and conditions. The critical accounting estimates upon which the Company's financial condition and results of operations depend, and which involve the most complex subjective decisions or assessments, are included in the discussion entitled "Critical Accounting Policies" in "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations," in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2023, and all amendments thereto, as filed with the SEC. There were no material changes to the critical accounting policies disclosed in the Annual Report on Form 10-K.

Liquidity

Liquidity is the ongoing ability to accommodate liability maturities and deposit withdrawals, fund asset growth and business operations, and meet contractual obligations through unconstrained access to funding at reasonable market rates. Liquidity management involves forecasting funding requirements and maintaining sufficient capacity to meet the needs and accommodate fluctuations in asset and liability levels due to changes in the Company's business operations or unanticipated events.

The ability to have readily available funds sufficient to repay fully maturing liabilities is of primary importance to depositors, creditors, and regulators. The Company's liquidity, represented by cash and amounts due from banks, federal funds sold, loans HFS, and non-pledged marketable securities, is a result of the Company's operating, investing, and financing activities and related cash flows. The Company actively monitors and manages liquidity, and no less than quarterly will estimate probable liquidity needs on a 12-month horizon. Liquidity needs can also be met through short-term borrowings or the disposition of short-term assets.

The following table presents the available and outstanding balances on the Company's lines of credit:

	March 31, 2024
	Available Balance		Outstanding Balance
	(in millions)
Unsecured fed funds credit lines at correspondent banks	$	839	$	—

In addition to lines of credit, the Company has borrowing capacity with the FHLB and FRB from pledged loans and securities and warehouse borrowing lines of credit. The borrowing capacity, outstanding borrowings, and available credit are presented in the following table:

	March 31, 2024
	(in millions)
FHLB:
Borrowing capacity	$	13,823
Outstanding borrowings	5,750
Letters of credit	101
Total available credit	$	7,972
FRB:
Borrowing capacity	$	10,947
Outstanding borrowings	—
Total available credit	$	10,947
Warehouse borrowings:
Borrowing capacity	$	2,250
Outstanding borrowings	—
Total available credit	$	2,250

The Company has a formal liquidity policy and, in the opinion of management, its liquid assets are considered adequate to meet financial obligations and support client activity during normal and stressed operating conditions. At March 31, 2024, there were $12.0 billion in liquid assets, comprised of $2.8 billion in cash on deposit at the FRB and $9.2 billion in securities not currently used as collateral for borrowings or other purposes. At December 31, 2023, the Company maintained $6.9 billion in liquid assets, comprised of $785 million in cash on deposit at the FRB and $6.1 billion in liquid securities not currently used as collateral for borrowings or other purposes.

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The Parent maintains liquidity that would be sufficient to fund its operations and certain non-bank affiliate operations for an extended period should funding from normal sources be disrupted. In the Company's analysis of Parent liquidity, it is assumed the Parent is unable to generate funds from additional debt or equity issuances, receives no dividend income from subsidiaries and does not pay dividends to stockholders, while continuing to make non-discretionary payments needed to maintain operations and repayment of contractual principal and interest payments owed by the Parent and affiliated companies. Under this scenario, the amount of time the Parent and its non-bank subsidiary can operate and meet all obligations before the current liquid assets are exhausted is considered as part of the Parent liquidity analysis. Management believes the Parent maintains adequate liquidity capacity to operate without additional funding from new sources for over twelve months.

WAB maintains sufficient funding capacity to address large increases in funding requirements, such as deposit outflows. This capacity is comprised of liquidity derived from a reduction in asset levels and various secured funding sources. On a long-term basis, the Company’s liquidity will be met by changing the relative distribution of its asset portfolios (for example, by reducing investment or loan volumes, or selling or encumbering assets). Further, the Company can increase liquidity by soliciting higher levels of deposit accounts through promotional activities and/or borrowing from correspondent banks, the FHLB of San Francisco, and the FRB. At March 31, 2024, the Company's long-term liquidity needs primarily relate to funds required to support loan originations, commitments, and deposit withdrawals, which can be met by cash flows from investment payments and maturities, and investment sales, if necessary.

The Company’s liquidity is comprised of three primary classifications: 1) cash flows provided by operating activities; 2) cash flows used in investing activities; and 3) cash flows provided by financing activities. Net cash provided by or used in operating activities consists primarily of net income, adjusted for changes in certain other asset and liability accounts and certain non-cash income and expense items, such as the provision for credit losses, investment and other amortization and depreciation. For the three months ended March 31, 2024 and 2023, net cash (used in) provided by operating activities was $(306.5) million and $357.3 million, respectively.

The Company's primary investing activities are the origination of real estate and commercial loans, the collection of repayments of these loans, and the purchase and sale of securities. The Company's net cash used in investing activities has been primarily influenced by its loan and securities activities. During the three months ended March 31, 2024, the Company's cash balance decreased by $526 million as a result of a net increase in loans, compared to a reduction in cash of $1.0 billion during the three months ended March 31, 2023 from a net increase in loans. A net increase in investment securities of $3.3 billion and $478 million for the three months ended March 31, 2024 and 2023, respectively, partially offset the increase to the Company's cash balance during the three months ended March 31, 2024 and March 31, 2023.

Net cash provided by financing activities has been impacted significantly by deposit levels. During the three months ended March 31, 2024, net deposits increased $6.9 billion, compared to a decrease in net deposits of $6.1 billion during the three months ended March 31, 2023.

Fluctuations in core deposit levels may increase the Company's need for liquidity as certificates of deposit mature or are withdrawn before maturity, and as non-maturity deposits, such as checking and savings account balances, are withdrawn. Additionally, the Company is exposed to the risk that customers with large deposit balances will withdraw all or a portion of such deposits, due in part to the FDIC limitations on the amount of insurance coverage provided to depositors. To mitigate the uninsured deposit risk, the Company participates in the CDARS and ICS programs, which allow an individual customer to invest up to $50 million and $225 million, respectively, through one participating financial institution or, a combined total of $275 million per individual customer, with the entire amount being covered by FDIC insurance. As of March 31, 2024, the Company has $1.6 billion of CDARS and $11.2 billion of ICS deposits.

As of March 31, 2024, the Company has $6.5 billion of wholesale brokered deposits outstanding, Brokered deposits are generally considered to be deposits that have been received from a third party who is engaged in the business of placing deposits on behalf of others. A traditional deposit broker will direct deposits to the banking institution offering the highest interest rate available. Federal banking laws and regulations place restrictions on depository institutions regarding brokered deposits because of the general concern that these deposits are not relationship based and are at a greater risk of being withdrawn and placed on deposit at another institution offering a higher interest rate, thus posing liquidity risk for institutions that gather brokered deposits in significant amounts.

Federal and state banking regulations place certain restrictions on dividends paid. The total amount of dividends which may be paid at any date is generally limited to the retained earnings of the bank. Dividends paid by WAB to the Parent would be prohibited if the effect thereof would cause the Bank’s capital to be reduced below applicable minimum capital requirements. During the three months ended March 31, 2024, WAB paid dividends to the Parent of $60 million. Subsequent to March 31, 2024, WAB paid dividends to the Parent of $60 million.

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Item 3.Quantitative and Qualitative Disclosures about Market Risk.

Market risk is the risk of loss in a financial instrument arising from adverse changes in market prices and rates, foreign currency exchange rates, commodity prices, and equity prices. The Company's market risk arises primarily from interest rate risk inherent in its lending, investing, and deposit taking activities. To that end, management actively monitors and manages the Company's interest rate risk exposure. The Company generally manages its interest rate sensitivity by evaluating re-pricing opportunities on its earning assets to those on its funding liabilities.

Management uses various asset/liability strategies to manage the re-pricing characteristics of the Company's assets and liabilities, all of which are designed to ensure that exposure to interest rate fluctuations is within the Company's guidelines of acceptable levels of risk-taking. Hedging strategies, including the terms and pricing of loans and deposits and management of the deployment of its securities, are used to reduce mismatches in interest rate re-pricing opportunities of portfolio assets and their funding sources. Derivatives in a hedging relationship are also used to minimize the Company's exposure to changes in benchmark interest rates and volatility of net interest income and EVE to interest rate fluctuations, with their impact reflected in the model results discussed below.

Interest rate risk is addressed by ALCO, which includes members of executive management, finance, and operations. ALCO monitors interest rate risk by analyzing the potential impact on the net EVE and net interest income from potential changes in interest rates and considers the impact of alternative strategies or changes in balance sheet structure. The Company manages its balance sheet in part to keep the potential impact on EVE and net interest income within acceptable ranges despite changes in interest rates.

The Company's exposure to interest rate risk is reviewed at least quarterly by ALCO. Interest rate risk exposure is measured using interest rate sensitivity analysis to determine its change in both EVE and net interest income in the event of hypothetical changes in interest rates. If potential changes to EVE and net interest income resulting from hypothetical interest rate changes are not within the limits established by the BOD or, ALCO determines that interest rate exposures should be reduced, ALCO will either take hedging actions or adjust the asset and liability mix to bring interest rate risk within BOD-approved limits or in line with ALCO's proposed reduction. ALCO may also decide the best course of action for a limit breach is to accept the breach and present justification to the BOD. If the BOD does not agree to accept the limit breach, it will direct ALCO to remediate the breach. The Company's net interest income and EVE exposure limits are approved by the BOD on an annual basis, or more often if market conditions warrant. During the three months ended March 31, 2024, there have been no changes to the Company's exposure limits.

Net Interest Income Simulation. To measure interest rate risk at March 31, 2024, the Company used a simulation model to project changes in net interest income that result from forecasted changes in interest rates. This analysis calculates the difference between a baseline net interest income forecast using current yield curves, compared to forecasted net income resulting from an immediate parallel shift in rates upward or downward, along with other scenarios directed by ALCO. The income simulation model includes various assumptions regarding re-pricing relationships for each of the Company's products. Many of the Company's assets are variable rate loans, which are assumed to re-price at the next rate re-set period and, proportional to the change in market rates, depending on their contracted index, including the impact of caps or floors. Some loans and investments contain contractual prepayment features (embedded options) and, accordingly, the simulation model incorporates prepayment assumptions. The Company's non-term deposit products re-price with a certain beta to underlying market rate changes. The Company regularly conducts sensitivity analysis for this assumption to determine the impact on the interest rate risk position. These betas are derived separately by deposit product and are based on both observed and projected market rate and balance trends. Current product deposit beta assumptions range between 47% to 81%, depending on product, with an average interest bearing deposit beta of 61%, inclusive of ECR costs.

This analysis illustrates the impact of changes in net interest income for the given set of rate changes and assumptions. It does not account for all factors that could impact the Company's results, including changes by management to mitigate interest rate changes or secondary factors, such as changes to the Company's credit risk profile as interest rates change. The results will also be impacted by seasonality in the balance sheet. Furthermore, loan prepayment rate estimates and spread relationships change regularly. Interest rate changes impact actual loan prepayment speeds and these changes may result in differences in the market estimates incorporated in this analysis. These assumptions are inherently uncertain and as a result, actual results may differ from simulated results due to factors such as timing, magnitude and frequency of interest rate changes as well as changes in market conditions, customer behavior, management strategies, and changes that vary significantly from the modeled assumptions may have a significant effect on the Company's actual net interest income.

This simulation model assesses the changes in net interest income that would occur in response to an instantaneous and sustained increase or decrease (shock) in market interest rates based on a dynamic balance sheet. The Company’s NII sensitivity assumptions have been updated to include more granular deposit beta assumptions by line of business. The Company continues to evaluate the scenarios that are presented as interest rates change and will update these scenario disclosures as appropriate.

77

Sensitivity of Net Interest Income

	Down 200		Down 100		Up 100		Up 200
	(change in basis points from Base)
Parallel Shift Scenario	(14.1)	%	(6.9)	%	6.8	%	13.6	%

At March 31, 2024, our net interest income exposure for the next twelve months related to these hypothetical changes in market interest rates was within our current guidelines.

Economic Value of Equity. The Company measures the impact of market interest rate changes on the NPV of estimated cash flows from its assets, liabilities, and off-balance sheet items, defined as EVE, using a simulation model. The Company's simulation model focuses on parallel interest rate shocks and takes into account assumptions related to loan prepayment trends that are sourced using a combination of third-party prepayment models and internal historical experience, terminal maturity for non-maturity deposits, decay attrition, and pricing sensitivity derived from the Company's data and other internally-developed analysis and models. These assumptions are reviewed at least annually and are adjusted periodically to reflect changes in market conditions and the Company's balance sheet composition. As simulated model results are based on a number of assumptions outlined above, including forecasted market conditions, actual amounts may differ significantly from the projections set forth below should market conditions vary from the underlying assumptions.

This simulation model assesses the changes in the market value of interest rate sensitive financial instruments that would occur in response to an instantaneous and sustained increase or decrease (shock) in market interest rates. The Company's EVE model assumptions have also been updated to include more granular deposit beta and attrition assumptions by line of business. The Company continues to evaluate the scenarios that are presented as interest rates change and will update these scenario disclosures as appropriate.

The following table shows the Company's projected change in EVE for this set of rate shocks at March 31, 2024:

Economic Value of Equity 

	Interest Rate Scenario
	Down 200		Down 100		Up 100		Up 200
			(change in basis points from Base)
% Change	10.1	%	6.4	%	(6.4)	%	(11.6)	%

At March 31, 2024, the Company's EVE exposure related to these hypothetical changes in market interest rates was within the Company's current guidelines.

Derivative Contracts. In the normal course of business, the Company uses derivative instruments to meet the needs of its customers and manage exposure to fluctuations in interest rates. For additional discussion on how derivatives in a hedging relationship (fair value hedges) are used to manage the Company's interest rate risk, see "Note 11. Derivatives and Hedging Activities" to the Unaudited Consolidated Financial Statements.

78

Item 4.Controls and Procedures.

Evaluation of Disclosure Controls

Based on their evaluation as of the end of the period covered by this Quarterly Report on Form 10-Q, the CEO and CFO have concluded that the disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) of the Exchange Act) are effective to ensure that information required to be disclosed by the Company in reports that it files or submits under the Exchange Act, as amended, is recorded, processed, summarized and reported within the time periods specified in SEC rules and forms. Additionally, the Company's disclosure controls and procedures were also effective in ensuring that information required to be disclosed by the Company in the reports it files or is subject to under the Exchange Act is accumulated and communicated to the Company's management, including the CEO and CFO, to allow timely decisions regarding required disclosures.

Changes in Internal Control over Financial Reporting

There have not been any changes in the Company's internal control over financial reporting during the quarter ended March 31, 2024, which have materially affected, or are reasonably likely to materially affect, the Company's internal control over financial reporting.

PART II. OTHER INFORMATION

Item 1.Legal Proceedings.

There are no material pending legal proceedings to which the Company is a party or to which any of its properties are subject. There are no material proceedings known to the Company to be contemplated by any governmental authority. From time to time, the Company is involved in a variety of litigation matters in the ordinary course of its business and anticipates that it will become involved in new litigation matters in the future.

79

Item 1A.Risk Factors.

There have not been any material changes to the risk factors previously disclosed in Item 1A of the Company's Annual Report on Form 10-K for the year ended December 31, 2023.

Item 2.Unregistered Sales of Equity Securities and Use of Proceeds.

Issuer Purchases of Equity Securities

The following table provides information about the Company's purchases of equity securities that are registered by the Company pursuant to Section 12 of the Exchange Act for the periods indicated:

Period	Total Number of Shares Purchased (1)(2)	Average Price Paid Per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs (2)	Approximate Dollar Value of Shares That May Yet be Purchased Under the Plans or Programs
January 2024	73	$	62.21	—	$	—
February 2024	122,524	61.55		—	—
March 2024	—	—		—	—
Total	122,597	$	61.55	—	$	—

(1)    Shares purchased during the period were transferred to the Company from employees in satisfaction of minimum tax withholding obligations associated with the vesting of restricted stock awards during the period.

(2)    The Company currently does not have a common stock repurchase program.

Item 5.Other Information

Insider Adoption or Termination of Trading Arrangements

During the quarter ended March 31, 2024, none of our directors or officers informed us of the adoption or termination of any “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangement,” as those terms are defined in Item 408 of Regulation S-K.

80

Item 6.Exhibits

EXHIBITS

3.1	Amended and Restated Certificate of Incorporation, effective as of May 19, 2015 (incorporated by reference to Exhibit 3.1 of Western Alliance's Form 10-K filed with the SEC on March 1, 2019).
3.2	Certificate of Amendment designating the 4.250% Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock, Series A, effective September 22, 2021 (incorporated by reference to Exhibit 3.1 of Western Alliance's Form 8-K filed with the SEC on September 22, 2021).
3.3	Amended and Restated Bylaws of Western Alliance, effective as of June 14, 2022 (incorporated by reference to Exhibit 3.1 of Western Alliance's Form 8-K filed with the SEC on June 16, 2022).
3.4	Articles of Conversion, as filed with the Nevada Secretary of State on May 29, 2014 (incorporated by reference to Exhibit 3.1 of Western Alliance’s Form 8-K filed with the SEC on June 3, 2014).
3.5	Certificate of Conversion, as filed with the Delaware Secretary of State on May 29, 2014 (incorporated by reference to Exhibit 3.2 of Western Alliance’s Form 8-K filed with the SEC on June 3, 2014).
31.1*	CEO Certification Pursuant Rule 13a-14(a)/15d-14(a).
31.2*	CFO Certification Pursuant Rule 13a-14(a)/15d-14(a).
32**	CEO and CFO Certification Pursuant to 18 U.S.C. Section 1350, as adopted pursuant to section 906 of the Sarbanes Oxley Act of 2002.
101*	Interactive data files pursuant to Rule 405 of Regulation S-T: (i) the Consolidated Balance Sheets as of March 31, 2024 and December 31, 2023, (ii) the Consolidated Income Statements for the three months ended March 31, 2024 and 2023 and three months ended March 31, 2024 and 2023, (iii) the Consolidated Statements of Comprehensive Income for the three months ended March 31, 2024 and 2023 and three months ended March 31, 2024 and 2023, (iv) the Consolidated Statements of Stockholders’ Equity for the three months ended March 31, 2024 and 2023 and the three months March 31, 2024 and 2023, (v) the Consolidated Statements of Cash Flows for the three months ended March 31, 2024 and 2023, and (vi) the Notes to Unaudited Consolidated Financial Statements. (Pursuant to Rule 406T of Regulation S-T, this information is deemed furnished and not filed for purposes of Sections 11 and 12 of the Securities Act of 1933 and Section 18 of the Securities Exchange Act of 1934.).
104*	The cover page of Western Alliance Bancorporation’s Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2024, formatted in Inline XBRL (contained in Exhibit 101).

*    Filed herewith.

**     Furnished herewith.

81

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	WESTERN ALLIANCE BANCORPORATION
May 2, 2024	By:	/s/ Kenneth A. Vecchione
		Kenneth A. Vecchione
		President and Chief Executive Officer
May 2, 2024	By:	/s/ Dale Gibbons
		Dale Gibbons
		Vice Chairman and Chief Financial Officer
May 2, 2024	By:	/s/ J. Kelly Ardrey Jr.
		J. Kelly Ardrey Jr.
		Chief Accounting Officer

82

EX-31.1

Exhibit 31.1

CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER

Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

I, Kenneth A. Vecchione, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of Western Alliance Bancorporation;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

		/s/ Kenneth A. Vecchione
		Kenneth A. Vecchione
		President and Chief Executive Officer
Date:	May 2, 2024	Western Alliance Bancorporation

EX-31.2

Exhibit 31.2

CERTIFICATION OF PRINCIPAL FINANCIAL OFFICER

Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

I, Dale Gibbons, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of Western Alliance Bancorporation;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

		/s/ Dale Gibbons
		Dale Gibbons
		Vice Chairman and Chief Financial Officer
Date:	May 2, 2024	Western Alliance Bancorporation

EX-32

Exhibit 32

CERTIFICATION OF CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER

PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

This certification is given by the undersigned Chief Executive Officer and Chief Financial Officer of Western Alliance Bancorporation (the “Registrant”) pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. Each of the undersigned hereby certifies, with respect to the Registrant's quarterly report on Form 10-Q for the quarter ended March 31, 2024, as filed with the Securities and Exchange Commission on the date hereof (the "Report"), that, to each of their knowledge:

1.The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

2.The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant.

Date:	May 2, 2024	/s/ Kenneth A. Vecchione
		President and Chief Executive Officer
		Western Alliance Bancorporation
Date:	May 2, 2024	/s/ Dale Gibbons
		Vice Chairman and Chief Financial Officer
		Western Alliance Bancorporation

XML

Cover - shares	3 Months Ended
	Mar. 31, 2024	Apr. 26, 2024
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2024
Document Transition Report	false
Entity File Number	001-32550
Entity Registrant Name	WESTERN ALLIANCE BANCORPORATION
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	88-0365922
Entity Address, Address Line One	One E. Washington Street, Suite 1400
Entity Address, City or Town	Phoenix
Entity Address, State or Province	AZ
Entity Address, Postal Zip Code	85004
City Area Code	602
Local Phone Number	389-3500
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		110,110,512
Entity Central Index Key	0001212545
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Common Stock
Entity Information [Line Items]
Title of 12(b) Security	Common Stock, $0.0001 Par Value
Trading Symbol	WAL
Security Exchange Name	NYSE
Noncumulative Preferred Stock
Entity Information [Line Items]
Title of 12(b) Security	Depositary Shares, Each Representing a 1/400th Interest in a Share of 4.250% Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock, Series A
Trading Symbol	WAL PrA
Security Exchange Name	NYSE

XML

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Assets:
Cash and due from banks	$ 264.0	$ 276.0
Interest-bearing deposits in other financial institutions	3,286.0	1,300.0
Cash and cash equivalents	3,550.0	1,576.0
Fair value	14,509.0	11,165.0
Amortized cost	1,453.0	1,421.0
Investment securities - equity	130.0	126.0
Investments in restricted stock, at cost	248.0	281.0
Loans HFS	1,841.0	1,402.0
Loans:
Loans HFI, net of deferred fees and costs	50,700.0	50,297.0
Less: allowance for credit losses	(340.3)	(336.7)
Net loans HFI	50,360.0	49,960.0
Mortgage servicing rights	1,178.0	1,124.0
Premises and equipment, net	344.0	339.0
Operating lease right of use asset	139.0	145.0
Bank owned life insurance	187.0	186.0
Goodwill and intangible assets, net	666.0	669.0
Deferred tax assets, net	300.0	287.0
Investments in LIHTC and renewable energy	553.0	573.0
Other assets	1,531.0	1,608.0
Total assets	76,989.0	70,862.0
Deposits:
Non-interest-bearing demand	18,399.0	14,520.0
Interest-bearing	43,829.0	40,813.0
Total deposits	62,228.0	55,333.0
Other borrowings	6,221.0	7,230.0
Qualifying debt	896.0	895.0
Operating lease liability	172.0	179.0
Other liabilities	1,300.0	1,147.0
Total liabilities	70,817.0	64,784.0
Commitments and contingencies (Note 14)
Stockholders’ equity:
Preferred stock (par value $0.0001 and liquidation value per share of $25; 20,000,000 authorized; 12,000,000 depositary shares issued and outstanding at March 31, 2024 and December 31, 2023)	295.0	295.0
Common stock (par value $0.0001; 200,000,000 authorized; 113,005,772 shares issued at March 31, 2024 and 112,169,523 at December 31, 2023) and additional paid in capital	2,211.0	2,197.0
Treasury stock, at cost (2,825,815 shares at March 31, 2024 and 2,703,218 shares at December 31, 2023)	(124.0)	(116.0)
Accumulated other comprehensive loss	(558.0)	(513.0)
Retained earnings	4,348.0	4,215.0
Total stockholders’ equity	6,172.5	6,078.4
Total liabilities and stockholders’ equity	$ 76,989.0	$ 70,862.0

XML

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Amortized cost	$ 15,251.0	$ 11,849.0
Investment securities - AFS, ACL	1.3	1.4
Investment securities - HTM, allowance for credit losses	8.0	8.0
Investment securities - HTM, fair value	$ 1,253.0	$ 1,251.0
Preferred stock, par value (dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, liquidation value (dollars per share)	$ 25	$ 25
Preferred stock, shares authorized (shares)	20,000,000	20,000,000
Preferred stock, shares outstanding (shares)	12,000,000	12,000,000
Preferred stock, shares issued (shares)	12,000,000	12,000,000
Common stock, par value (dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (shares)	200,000,000	200,000,000
Common stock, shares issued (shares)	113,005,772	112,169,523
Treasury stock (shares)	2,825,815	2,703,218

XML

CONSOLIDATED INCOME STATEMENTS - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Interest income:
Loans, including fees	$ 871.9	$ 832.7
Investment securities	142.4	94.3
Dividends and other	40.7	41.9
Total interest income	1,055.0	968.9
Interest expense:
Deposits	380.6	231.6
Qualifying debt	9.5	9.3
Other borrowings	66.0	118.1
Total interest expense	456.1	359.0
Net interest income	598.9	609.9
Provision for credit losses	15.2	19.4
Net interest income after provision for credit losses	583.7	590.5
Non-interest income:
Net loan servicing revenue	46.4	41.9
Net gain on loan origination and sale activities	45.3	31.4
Income from equity investments	17.1	1.4
Service charges and fees	9.9	9.5
Commercial banking related income	6.5	6.2
Fair value gain (loss) adjustments, net	0.3	(147.8)
(Loss) gain on recovery from credit guarantees	(0.5)	3.3
Loss on sales of investment securities	(0.9)	(12.5)
Other income	5.8	8.6
Total non-interest income	129.9	(58.0)
Non-interest expense:
Salaries and employee benefits	154.9	148.9
Deposit costs	137.0	86.9
Insurance	58.9	15.7
Data processing	36.0	26.4
Legal, professional, and directors' fees	30.1	23.1
Occupancy	17.5	16.5
Loan servicing expenses	15.0	13.8
Business development and marketing	5.5	5.2
Loan acquisition and origination expenses	4.8	4.4
Gain on extinguishment of debt	0.0	(12.7)
Other expense	22.1	19.7
Total non-interest expense	481.8	347.9
Income before provision for income taxes	231.8	184.6
Income tax expense	54.4	42.4
Net income	177.4	142.2
Dividends on preferred stock	3.2	3.2
Net income available to common stockholders	$ 174.2	$ 139.0
Earnings per share:
Basic (dollars per share)	$ 1.61	$ 1.29
Diluted (dollars per share)	$ 1.60	$ 1.28
Weighted average number of common shares outstanding:
Basic (shares)	108.5	108.1
Diluted (shares)	109.0	108.3
Dividends declared per common share (dollars per share)	$ 0.37	$ 0.36

XML

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 177.4	$ 142.2
Other comprehensive (loss) income, net:
Unrealized (loss) gain on AFS securities, net of tax effect of $14.8 and $(20.7) respectively	(44.9)	60.1
Unrealized loss on junior subordinated debt, net of tax effect of $0.2 and $0.4 respectively	(0.5)	(1.1)
Realized loss on sale of AFS securities included in income, net of tax effect of $(0.2) and $(3.2) respectively	0.7	9.3
Realized loss on impairment of AFS securities included in income, net of tax effect of $— and $(0.4) respectively	0.0	1.2
Net other comprehensive (loss) income	(44.7)	69.5
Comprehensive income	$ 132.7	$ 211.7

XML

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Unrealized (loss) gain on AFS securities, tax effect	$ 14.8	$ (20.7)
Unrealized gain (loss) on junior subordinated debt, tax effect	0.2	0.4
Realized loss (gain) on sale of AFS securities included in income, tax effect	(0.2)	(3.2)
Realized loss on impairment of AFS securities included in income, tax effect	$ 0.0	$ (0.4)

XML

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Millions, $ in Millions		Total	Preferred Stock	Common Stock	Additional Paid in Capital	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Retained Earnings
Beginning balance (shares) at Dec. 31, 2022			12.0	108.9
Beginning balance at Dec. 31, 2022		$ 5,356.0	$ 294.5	$ 0.0	$ 2,163.7	$ (105.3)	$ (661.0)	$ 3,664.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		142.2						142.2
Restricted stock, performance stock units, and other grants, net (shares)				0.7
Restricted stock, performance stock units, and other grants, net		6.1			6.1
Restricted stock surrendered (shares)	[1]			(0.1)
Restricted stock surrendered	[1]	(10.7)				(10.7)
Dividends paid to preferred stockholders		(3.2)						(3.2)
Dividends paid to common stockholders		(39.4)						(39.4)
Other comprehensive income, net		69.5					69.5
Ending balance (shares) at Mar. 31, 2023			12.0	109.5
Ending balance at Mar. 31, 2023		5,520.5	$ 294.5	$ 0.0	2,169.8	(116.0)	(591.5)	3,763.7
Beginning balance (shares) at Dec. 31, 2023			12.0	109.4
Beginning balance at Dec. 31, 2023		6,078.4	$ 294.5	$ 0.0	2,198.1	(116.3)	(512.9)	4,215.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		177.4						177.4
Restricted stock, performance stock units, and other grants, net (shares)				0.9
Restricted stock, performance stock units, and other grants, net		13.1			13.1
Restricted stock surrendered (shares)	[1]			(0.1)
Restricted stock surrendered	[1]	(7.8)			(0.2)	(7.6)
Dividends paid to preferred stockholders		(3.2)						(3.2)
Dividends paid to common stockholders		(40.7)						(40.7)
Other comprehensive income, net		(44.7)					(44.7)
Ending balance (shares) at Mar. 31, 2024			12.0	110.2
Ending balance at Mar. 31, 2024		$ 6,172.5	$ 294.5	$ 0.0	$ 2,211.0	$ (123.9)	$ (557.6)	$ 4,348.5

[1] Share amounts represent Treasury Shares.

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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities:
Net income		$ 177.4	$ 142.2
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Provision for credit losses		15.2	19.4
Depreciation and amortization		20.8	16.5
Stock-based compensation		13.1	6.1
Deferred income taxes		2.7	(5.5)
Amortization of net (discounts) premiums for investment securities		(56.5)	2.0
Amortization of tax credit investments		18.6	11.3
Amortization of operating lease right of use asset		6.0	6.0
Amortization of net deferred loan fees and net purchase premiums		(20.9)	(22.6)
Purchases and originations of loans HFS		(9,984.5)	(8,067.2)
Proceeds from sales and payments on loans HFS		9,432.8	8,265.4
Mortgage servicing rights capitalized upon sale of mortgage loans		(188.7)	(142.4)
Net (gains) losses on:
Change in fair value of loans HFS, mortgage servicing rights, and related derivatives		(28.5)	43.5
Fair value adjustments		0.7	149.8
Sale of investment securities		0.9	12.5
Extinguishment of debt		0.0	(12.7)
Other		(3.0)	(3.6)
Other assets and liabilities, net		287.4	(63.4)
Net cash (used in) provided by operating activities		(306.5)	357.3
Investment securities - AFS
Purchases		(5,938.0)	(931.3)
Principal pay downs and maturities		1,285.6	61.1
Proceeds from sales		1,403.2	429.3
Investment securities - HTM
Purchases		(36.9)	(44.0)
Principal pay downs and maturities		4.2	7.7
Equity securities carried at fair value
Purchases		(0.2)	(0.5)
Proceeds from sale of mortgage servicing rights and related holdbacks, net		162.3	335.2
Sale (purchase) of other investments		16.6	(172.6)
Net increase in loans HFI		(525.7)	(1,003.5)
Purchase of premises, equipment, and other assets, net		(18.8)	(28.5)
Net cash used in investing activities		(3,647.7)	(1,347.1)
Cash flows from financing activities:
Net increase (decrease) in deposits		6,895.7	(6,056.6)
Payments on long-term debt		(5.4)	(257.3)
Net (decrease) increase in short-term borrowings		(910.6)	9,952.9
Cash paid for tax withholding on vested restricted stock and other		(7.8)	(10.7)
Cash dividends paid on common stock and preferred stock		(43.9)	(42.6)
Net cash provided by financing activities		5,928.0	3,585.7
Net increase in cash and cash equivalents		1,973.8	2,595.9
Cash, cash equivalents, and restricted cash at beginning of period		1,576.1	1,043.4
Cash, cash equivalents, and restricted cash at end of period		3,549.9	3,639.3
Cash paid during the period for:
Interest		439.0	329.5
Income taxes, net		(145.2)	(7.5)
Non-cash activities:
Transfers of mortgage-backed securities in settlement of secured borrowings		95.4	125.2
Transfers of securitized loans HFS to AFS securities		60.6	43.9
Transfers of loans HFI to HFS, net of fair value loss adjustment (1)	[1]	$ 142.1	$ 5,910.4

[1] (1)Activity for the three months ended March 31, 2024 and 2023 excludes $89.1 million and $294.4 million, respectively, of loans transferred with an original designation of HFS, which sales activity was classified as operating cash flows.

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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Cash Flows [Abstract]
Loans transferred with original designation of HFS, operating cash flows	$ 89.1	$ 294.4

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Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2024

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Nature of operations

WAL is a bank holding company headquartered in Phoenix, Arizona, incorporated under the laws of the state of Delaware. WAL provides a full spectrum of customized loan, deposit, and treasury management capabilities, including 24/7 funds transfer and other digital payment offerings through its wholly-owned banking subsidiary, WAB.

WAB operates the following full-service banking divisions: ABA, BON, FIB, Bridge, and TPB. The Company also serves business customers through a national platform of specialized financial services, including mortgage banking services through AmeriHome, and digital payment services for the class action legal industry. In addition, the Company has the following non-bank subsidiaries: CSI, a captive insurance company formed and licensed under the laws of the State of Arizona and established as part of the Company's overall enterprise risk management strategy, and WATC, which provides corporate trust services and levered loan administration solutions.

Basis of presentation

The accompanying Unaudited Consolidated Financial Statements as of March 31, 2024 and for the three months ended March 31, 2024 and 2023 have been prepared in accordance with GAAP for interim financial information and Article 10 of Regulation S-X and, therefore, do not include all of the information and footnotes required by GAAP for complete financial statements. Accordingly, these statements should be read in conjunction with the Company's audited Consolidated Financial Statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2023. The accounts of the Company and its consolidated subsidiaries are included in the Consolidated Financial Statements.

The information furnished in these interim statements reflects all adjustments that are, in the opinion of management, necessary for a fair statement of the results for each respective period presented. Such adjustments are of a normal, recurring nature. The results of operations in the interim statements are not necessarily indicative of the results that may be expected for any other quarter or for the full year.

Recent accounting pronouncements

Improvements to Income Tax Disclosures

In December 2023, the FASB issued guidance within ASU 2023-09, Income Taxes (Topic 740). The amendments in this update are intended to increase visibility into various income tax components that affect the reconciliation of the effective tax rate to the statutory rate, as well as the qualitative and quantitative aspects of those components. Public business entities will be required to disclose on an annual basis, specific categories in the rate reconciliation and provide additional information for reconciling items that meet or exceed a five percent threshold (computed by multiplying pretax income by the applicable statutory income tax rate) and include disclosure of state and local jurisdictions that make up the majority of the state and local income tax category in the rate reconciliation. Additional disclosure items include disaggregation of income taxes paid to and income tax expense from federal, state, and foreign jurisdictions as well as disaggregation of income taxes paid to individual jurisdictions in which income taxes paid are equal to or greater than five percent of total income taxes paid.

The amendments in this update are effective for fiscal years beginning after December 15, 2024 and interim periods within fiscal years beginning after December 15, 2025 and may be applied on a prospective or retrospective basis. The Company is currently evaluating the impact these amendments will have on its Consolidated Financial Statements.

Accounting for and Disclosure of Crypto Assets

In December 2023, the FASB issued guidance within ASU 2023-08, Intangibles — Goodwill and Other — Crypto Assets (Topic 350). The amendments in this update require entities that hold certain crypto assets to measure such assets at fair value and recognize any changes in fair value in net income in each reporting period. Entities will also be required to present crypto assets measured at fair value separately from other intangible assets on the balance sheet and changes from the remeasurement of crypto assets separately from changes in the carrying amounts of other intangible assets in the income statement. Other disclosure items include the name, cost basis, fair value, and number of units for each significant crypto asset holding and the aggregate fair values and cost bases of crypto asset holdings that are not individually significant along with a rollforward of activity in the reporting period and disclosure of the method for determining the cost basis of the crypto assets.

The amendments in this update are effective for fiscal years beginning after December 15, 2024, including interim periods within those fiscal years and are applied through a cumulative-effect adjustment to the opening balance of retained earnings (as of the beginning of the annual reporting period of adoption). As the Company does not currently hold any crypto assets meeting the criteria outlined in the update, the adoption of this guidance is not expected to have an impact on the Company's Consolidated Financial Statements.

Improvements to Reportable Segment Disclosures

In November 2023, the FASB issued guidance within ASU 2023-07, Segment Reporting (Topic 280). The amendments in this update are intended to improve reportable segment disclosure requirements, primarily through enhanced disclosures related to significant segment expenses. The amendments do not change how an entity identifies its operating segments, aggregates those operating segments, or applies the quantitative thresholds to determine its reportable segments and all existing segment disclosure requirements in ASC 280 and other Codification topics remain unchanged. The amendments in this update are incremental and require public entities that report segment information to disclose, on an annual and interim basis, significant segment expenses that are regularly provided to the chief operating decision maker and included within each reported measure of segment profit or loss as well as other segment items. Annual disclosure of the title and position of the chief operating decision maker and how the reported measures of segment profit or loss are used to assess performance and allocation of resources is also required.

The amendments in this update are effective for fiscal years beginning after December 15, 2023 and interim periods within fiscal years beginning after December 15, 2024 and are applied on a retrospective basis. The Company is currently evaluating the impact these amendments will have on its Consolidated Financial Statements.

Recently adopted accounting guidance

Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method

In March 2023, the FASB issued guidance within ASU 2023-02, Investments — Equity Method and Joint Ventures (Topic 323). The amendments in this update permit entities to elect to account for tax equity investments, regardless of the tax credit program from which the income tax credits are received, using the proportional amortization method if certain conditions are met. Previously this option was only permitted for LIHTC investments. Additionally, the amendments in this update require that all tax equity investments accounted for using the proportional amortization method apply the delayed equity contribution guidance in Subtopic 323-740 and disclosure of the nature of an entity's tax equity investments and their effect on an entity's financial position and results of operations.

The Company adopted this accounting guidance prospectively on January 1, 2024. The adoption of this guidance did not have a material impact on the Company's Consolidated Financial Statements.

Use of estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Management's estimates and judgments are ongoing and are based on experience, current and expected future conditions, third-party evaluations and various other assumptions that management believes are reasonable under the circumstances. The results of these estimates form the basis for making judgments about the carrying values of assets and liabilities, as well as identifying and assessing the accounting treatment with respect to commitments and contingencies. Actual results may differ from those estimates and assumptions used in the Consolidated Financial Statements and related notes. Material estimates that are susceptible to significant changes in the near term relate to: 1) the determination of the ACL; 2) certain assets and liabilities carried at or evaluated using fair value measurements; 3) goodwill impairment; and 4) accounting for income taxes.

Principles of consolidation

As of March 31, 2024, WAL has the following significant wholly-owned subsidiaries: WAB and eight unconsolidated subsidiaries used as business trusts in connection with the issuance of trust-preferred securities.

WAB has the following significant wholly-owned subsidiaries: 1) WABT, which holds certain investment securities, municipal and nonprofit loans, and leases; 2) WA PWI, which holds interests in certain limited partnerships invested primarily in low income housing tax credits and small business investment corporations; 3) Helios Prime, which holds interests in certain limited partnerships invested in renewable energy projects; 4) BW Real Estate, Inc., which operates as a real estate investment trust and holds certain of WAB's real estate loans and related securities; and 5) Western Finance Company, which purchases and originates equipment finance leases and provides mortgage banking services through its wholly-owned subsidiary, AmeriHome.

The Company does not have any other significant entities that should be consolidated. All significant intercompany balances and transactions have been eliminated in consolidation.

Reclassifications

Certain amounts in the Consolidated Income Statements for the prior periods have been reclassified to conform to the current presentation. The reclassifications had no effect on net income or stockholders’ equity as previously reported.

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Investment Securities

3 Months Ended

Mar. 31, 2024

Investments, Debt and Equity Securities [Abstract]

Investment Securities

2. INVESTMENT SECURITIES

The carrying amounts and fair values of investment securities are summarized as follows:

	March 31, 2024
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)		Fair Value
	(in millions)
Held-to-maturity
Tax-exempt	$	1,278	$	—	$	(169)	$	1,109
Private label residential MBS	183		—		(39)		144
Total HTM securities	$	1,461	$	—	$	(208)	$	1,253
Available-for-sale debt securities
U.S. Treasury securities	$	7,019	$	—	$	(8)	$	7,011
Residential MBS issued by GSEs	4,928		3		(395)		4,536
Private label residential MBS	1,301		1		(211)		1,091
Tax-exempt	927		—		(78)		849
Commercial MBS issued by GSEs	591		5		(10)		586
Corporate debt securities	411		—		(44)		367
Other	74		3		(8)		69
Total AFS debt securities	$	15,251	$	12	$	(754)	$	14,509

	December 31, 2023
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)		Fair Value
	(in millions)
Held-to-maturity
Tax-exempt	$	1,243	$	1	$	(140)	$	1,104
Private label residential MBS	186		—		(39)		147
Total HTM securities	$	1,429	$	1	$	(179)	$	1,251
Available-for-sale debt securities
U.S. Treasury securities	$	4,853	$	1	$	(1)	$	4,853
Residential MBS issued by GSEs	2,328		3		(359)		1,972
CLO	1,407		1		(9)		1,399
Private label residential MBS	1,320		1		(204)		1,117
Tax-exempt	925		—		(67)		858
Commercial MBS issued by GSEs	531		8		(9)		530
Corporate debt securities	411		—		(44)		367
Other	74		4		(9)		69
Total AFS debt securities	$	11,849	$	18	$	(702)	$	11,165

In addition, the Company held equity securities, which primarily consisted of preferred stock and CRA investments, with a fair value of $130 million and $126 million at March 31, 2024 and December 31, 2023, respectively. Unrealized gains on equity securities of $3.9 million and losses of $8.5 million for the three months ended March 31, 2024 and 2023, respectively, were recognized in earnings as a component of Fair value gain (loss) adjustments, net.

Securities with carrying amounts of approximately $8.0 billion and $7.7 billion at March 31, 2024 and December 31, 2023, respectively, were pledged for various purposes as required or permitted by law.

The following tables summarize the Company's AFS debt securities in an unrealized loss position, aggregated by major security type and length of time in a continuous unrealized loss position: 

	March 31, 2024
	Less Than Twelve Months				More Than Twelve Months				Total
	Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value
	(in millions)
Available-for-sale debt securities
U.S. Treasury securities	$	8	$	6,338	$	—	$	—	$	8	$	6,338
Residential MBS issued by GSEs	5		1,125		390		1,570		395		2,695
Private label residential MBS	—		—		211		997		211		997
Tax-exempt	1		33		77		815		78		848
Commercial MBS issued by GSEs	1		137		9		52		10		189
Corporate debt securities (1)	—		—		44		360		44		360
Other	—		—		8		55		8		55
Total AFS securities	$	15	$	7,633	$	739	$	3,849	$	754	$	11,482

(1)Includes securities with an ACL that have a fair value of $22 million and unrealized losses of $6 million.

	December 31, 2023
	Less Than Twelve Months				More Than Twelve Months				Total
	Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value
	(in millions)
Available-for-sale debt securities
U.S. Treasury securities	$	1	$	2,208	$	—	$	—	$	1	$	2,208
Residential MBS issued by GSEs	3		174		356		1,551		359		1,725
Private label residential MBS	—		—		204		1,020		204		1,020
CLO	—		—		9		845		9		845
Tax-exempt	3		67		64		773		67		840
Corporate debt securities (1)	—		—		44		359		44		359
Commercial MBS issued by GSEs	—		—		9		53		9		53
Other	—		—		9		54		9		54
Total AFS securities	$	7	$	2,449	$	695	$	4,655	$	702	$	7,104

(1)Includes securities with an ACL that have a fair value of $54 million and unrealized losses of $8 million.

The total number of AFS debt securities in an unrealized loss position at March 31, 2024 was 770, compared to 708 at December 31, 2023.

On a quarterly basis, the Company performs an impairment analysis on its AFS debt securities in an unrealized loss position at the end of the period to determine whether credit losses should be recognized on these securities.

Qualitative considerations made by the Company in its impairment analysis are further discussed below.

Government Issued Securities

U.S. Treasury securities and commercial and residential MBS are issued by either government agencies or GSEs. These securities are either explicitly or implicitly guaranteed by the U.S. government and are highly rated by major rating agencies. Further, principal and interest payments on these securities continue to be made on a timely basis.

Non-Government Issued Securities

Qualitative factors used in the Company's credit loss assessment of its securities that are not issued and guaranteed by the U.S. government include consideration of any adverse conditions related to a specific security, industry, or geographic region of its securities, any credit ratings below investment grade, the payment structure of the security and the likelihood of the issuer to be able to make payments that increase in the future, and failure of the issuer to make any scheduled principal or interest payments.

For the Company's corporate debt and tax-exempt securities, the Company also considers various metrics of the issuer including days of cash on hand, the ratio of long-term debt to total assets, the net change in cash between reporting periods, and consideration of any breach in covenant requirements. The Company's corporate debt securities are primarily investment grade, issuers continue to make timely principal and interest payments, and the unrealized losses on these security portfolios primarily relate to changes in interest rates and other market conditions not considered to be credit-related issues. The Company continues to receive timely principal and interest payments on its tax-exempt securities and the majority of these issuers have revenues pledged for payment of debt service prior to payment of other types of expenses.

In consideration of the continued effects from the bank failures in 2023, the Company performed a targeted impairment analysis on its AFS debt securities issued by regional banks held in its corporate debt securities portfolio. The Company considered the issuers' credit ratings, probability of default, and other factors. As a result of the analysis, a $0.1 million recovery and $19.3 million provision for credit losses were recognized during the three months ended March 31, 2024 and 2023, respectively. The provision for credit losses for the three months ended March 31, 2023 included recognition of a $17.1 million charge-off for one debt security issued by a regional bank that was sold. The Company does not intend to sell and it is more likely than not the Company will not be required to sell the remainder of these regional bank debt securities prior to their anticipated recovery, therefore, no additional credit losses on the Company's remaining portfolio have been recognized during the three months ended March 31, 2024.

For the Company's private label residential MBS, which consist of non-agency collateralized mortgage obligations secured by pools of residential mortgage loans, the Company also considers metrics such as securitization risk weight factor, current credit support, whether there were any mortgage principal losses resulting from defaults in payments on the underlying mortgage collateral, and the credit default rate over the last twelve months. These securities primarily carry investment grade credit ratings, principal and interest payments on these securities continue to be made on a timely basis, and credit support for these securities is considered adequate.

The Company's CLO portfolio consisted of highly rated securitization tranches, containing pools of medium to large-sized corporate, high yield loans. These were variable rate securities that had an investment grade rating of Single-A or better. Unrealized losses on these securities were primarily a function of the differential from the offer price and the valuation mid-market price as well as changes in interest rates.

Unrealized losses on the Company's other securities portfolio relate to taxable municipal and trust preferred securities. The Company is continuing to receive timely principal and interest payments on its taxable municipal securities, these securities continue to be highly rated and the number of days of cash on hand is strong. The Company's trust preferred securities are investment grade and the issuers continue to make timely principal and interest payments.

The following table presents a rollforward by major security type of the ACL on the Company's AFS debt securities:

	Three Months Ended March 31, 2024
	Balance, December 31, 2023		Recovery of Credit Losses		Charge-offs		Recoveries		Balance, March 31, 2024
	(in millions)
Available for sale securities
Corporate debt securities	$	1.4	$	(0.1)	$	—	$	—	$	1.3

	Three Months Ended March 31, 2023
	Balance, December 31, 2022		Provision for Credit Losses		Charge-offs		Recoveries		Balance March 31, 2023
	(in millions)
Available for sale securities
Corporate debt securities	$	—	$	19.3	$	(17.1)	$	—	$	2.2

The credit loss model under ASC 326-20, applicable to HTM debt securities, requires recognition of lifetime expected credit losses through an allowance account at the time the security is purchased.

The following table presents a rollforward by major security type of the ACL on the Company's HTM debt securities:

	Three Months Ended March 31, 2024
	Balance, December 31, 2023		Provision for Credit Losses		Charge-offs		Recoveries		Balance, March 31, 2024
	(in millions)
Held-to-maturity debt securities
Tax-exempt	$	7.8	$	0.4	$	—	$	—	$	8.2

	Three Months Ended March 31, 2023
	Balance, December 31, 2022		Provision for Credit Losses		Charge-offs		Recoveries		Balance March 31, 2023
	(in millions)
Held-to-maturity debt securities
Tax-exempt	$	5.2	$	1.3	$	—	$	—	$	6.5

No allowance has been recognized on the Company's HTM private label residential MBS as losses are not expected due to the Company holding a senior position in these securities.

Accrued interest receivable on HTM securities totaled $5 million at March 31, 2024 and December 31, 2023, and is excluded from the estimate of expected credit losses.

The following tables summarize the carrying amount of the Company’s investment ratings position, which are updated quarterly and used to monitor the credit quality of the Company's securities: 

	March 31, 2024
	AAA		Split-rated AAA/AA+		AA+ to AA-		A+ to A-		BBB+ to BBB-		BB+ and below		Unrated		Totals
	(in millions)
Held-to-maturity
Tax-exempt	$	—	$	—	$	—	$	—	$	—	$	—	$	1,278	$	1,278
Private label residential MBS	—		—		—		—		—		—		183		183
Total HTM securities (1)	$	—	$	—	$	—	$	—	$	—	$	—	$	1,461	$	1,461
Available-for-sale debt securities
U.S. Treasury securities	$	—	$	7,011	$	—	$	—	$	—	$	—	$	—	$	7,011
Residential MBS issued by GSEs	—		4,536		—		—		—		—		—		4,536
Private label residential MBS	1,064		—		26		—		—		1		—		1,091
Tax-exempt	9		15		356		380		—		—		89		849
Commercial MBS issued by GSEs	—		586		—		—		—		—		—		586
Corporate debt securities	—		—		—		76		242		49		—		367
Other	—		—		9		11		29		3		17		69
Total AFS securities (1)	$	1,073	$	12,148	$	391	$	467	$	271	$	53	$	106	$	14,509
Equity securities
Preferred stock	$	—	$	—	$	—	$	—	$	55	$	38	$	12	$	105
CRA investments	—		25		—		—		—		—		—		25
Total equity securities (1)	$	—	$	25	$	—	$	—	$	55	$	38	$	12	$	130

(1)For rated securities, if ratings differ, the Company uses an average of the available ratings by major credit agencies.

	December 31, 2023
	AAA		Split-rated AAA/AA+		AA+ to AA-		A+ to A-		BBB+ to BBB-		BB+ and below		Unrated		Totals
	(in millions)
Held-to-maturity
Tax-exempt	$	—	$	—	$	—	$	—	$	—	$	—	$	1,243	$	1,243
Private label residential MBS	—		—		—		—		—		—		186		186
Total HTM securities (1)	$	—	$	—	$	—	$	—	$	—	$	—	$	1,429	$	1,429
Available-for-sale debt securities
U.S. Treasury securities	$	—	$	4,853	$	—	$	—	$	—	$	—	$	—	$	4,853
Residential MBS issued by GSEs	—		1,972		—		—		—		—		—		1,972
CLO	79		—		1,265		55		—		—		—		1,399
Private label residential MBS	1,090		—		26		—		—		1		—		1,117
Tax-exempt	9		16		361		386		—		—		86		858
Commercial MBS issued by GSEs	—		530		—		—		—		—		—		530
Corporate debt securities	—		—		—		76		211		80		—		367
Other	—		—		9		11		28		4		17		69
Total AFS securities (1)	$	1,178	$	7,371	$	1,661	$	528	$	239	$	85	$	103	$	11,165
Equity securities
Preferred stock	$	—	$	—	$	—	$	—	$	54	$	35	$	11	$	100
CRA investments	—		26		—		—		—		—		—		26
Total equity securities (1)	$	—	$	26	$	—	$	—	$	54	$	35	$	11	$	126

(1)For rated securities, if ratings differ, the Company uses an average of the available ratings by major credit agencies.

A security is considered to be past due once it is 30 days contractually past due under the terms of the agreement. As of March 31, 2024, the Company did not have a significant amount of investment securities that were past due or on nonaccrual status.

The amortized cost and fair value of the Company's debt securities as of March 31, 2024, by contractual maturities are shown below. MBS are shown separately as individual MBS are comprised of pools of loans with varying maturities. Therefore, these securities are listed separately in the maturity summary.

	March 31, 2024
	Amortized Cost		Estimated Fair Value
	(in millions)
Held-to-maturity
Due in one year or less	$	29	$	29
After one year through five years	8		8
After five years through ten years	86		74
After ten years	1,155		998
Mortgage-backed securities	183		144
Total HTM securities	$	1,461	$	1,253
Available-for-sale
Due in one year or less	$	6,540	$	6,535
After one year through five years	646		634
After five years through ten years	278		242
After ten years	967		885
Mortgage-backed securities	6,820		6,213
Total AFS securities	$	15,251	$	14,509

The following table presents gross gains and losses on sales of investment securities:

	Three Months Ended March 31,
	2024		2023
	(in millions)
Available-for-sale securities
Gross gains	$	0.9	$	3.4
Gross losses	(1.8)		(15.9)
Net losses on AFS securities	$	(0.9)	$	(12.5)

During the three months ended March 31, 2024, the Company sold AFS securities with a carrying value of $1.4 billion and recognized a net loss of $0.9 million. CLOs were sold as part of the Company's efforts to shift the investment portfolio mix toward high quality liquid assets. During the three months ended March 31, 2023, the Company sold securities with a carrying value of $459 million and recognized a net loss of $12.5 million. Sales of CLOs were executed as part of the Company's balance sheet repositioning strategy and resulted in gross AFS securities losses for the three months ended March 31, 2023. Sales of MBS and tax-exempt municipal securities were completed to secure gains.

XML

Loans Held For Sale

3 Months Ended

Mar. 31, 2024

Receivables [Abstract]

Loans Held For Sale

3. LOANS HELD FOR SALE

The Company purchases and originates residential mortgage loans through its AmeriHome mortgage banking business channel that are held for sale or securitization.

The following is a summary of loans HFS by type:

	March 31, 2024		December 31, 2023
	(in millions)
Government-insured or guaranteed:
EBO (1)	$	—	$	2
Non-EBO	764		498
Total government-insured or guaranteed	764		500
Agency-conforming	1,067		899
Non-agency	10		3
Total loans HFS	$	1,841	$	1,402

(1)    EBO loans are delinquent FHA, VA, or USDA loans purchased from GNMA pools under the terms of the GNMA MBS program that can be repooled when loans are brought current either through the borrower's reperformance or through completion of a loan modification.

The following is a summary of the net gain on loan purchase, origination, and sale activities on residential mortgage loans to be sold or securitized:

	Three Months Ended March 31,
	2024		2023
	(in millions)
Mortgage servicing rights capitalized upon sale of loans	$	188.7	$	142.4
Net proceeds from sale of loans (1)	(160.7)		(107.4)
Provision for and change in estimate of liability for losses under representations and warranties, net	3.2		2.4
Change in fair value	(6.7)		6.6
Change in fair value of derivatives:
Unrealized gain (loss) on derivatives	15.3		(22.2)
Realized gain on derivatives	(8.1)		(2.4)
Total change in fair value of derivatives	7.2		(24.6)
Net gain on residential mortgage loans HFS	$	31.7	$	19.4
Loan acquisition and origination fees	13.6		12.0
Net gain on loan origination and sale activities	$	45.3	$	31.4

(1)     Represents the difference between cash proceeds received upon settlement and loan basis.

4. LOANS, LEASES AND ALLOWANCE FOR CREDIT LOSSES

The composition of the Company's HFI loan portfolio is as follows:

	March 31, 2024		December 31, 2023
	(in millions)
Warehouse lending	$	6,915	$	6,618
Municipal & nonprofit	1,622		1,554
Tech & innovation	2,941		2,808
Equity fund resources	695		845
Other commercial and industrial	7,754		7,452
CRE - owner occupied	1,707		1,658
Hotel franchise finance	3,556		3,855
Other CRE - non-owner occupied	6,365		5,974
Residential	13,078		13,287
Residential - EBO	1,171		1,223
Construction and land development	4,746		4,862
Other	150		161
Total loans HFI	50,700		50,297
Allowance for credit losses	(340)		(337)
Total loans HFI, net of allowance	$	50,360	$	49,960

Loans classified as HFI are stated at the amount of unpaid principal, adjusted for net deferred fees and costs, premiums and discounts on acquired and purchased loans, and an ACL. Net deferred fees of $102 million and $108 million reduced the carrying value of loans as of March 31, 2024 and December 31, 2023, respectively. Net unamortized purchase premiums on acquired and purchased loans of $175 million and $177 million increased the carrying value of loans as of March 31, 2024 and December 31, 2023, respectively.

Nonaccrual and Past Due Loans

Loans are placed on nonaccrual status when management determines that the full repayment of principal and collection of interest according to contractual terms is no longer likely, generally when the loan becomes 90 days or more past due.

The following tables present nonperforming loan balances by loan portfolio segment:

	March 31, 2024
	Nonaccrual with No Allowance for Credit Loss		Nonaccrual with an Allowance for Credit Loss		Total Nonaccrual		Loans Past Due 90 Days or More and Still Accruing
	(in millions)
Municipal & nonprofit	$	—	$	5	$	5	$	—
Tech & innovation	34		28		62		—
Other commercial and industrial	15		20		35		6
CRE - owner occupied	8		2		10		—
Hotel franchise finance	—		12		12		—
Other CRE - non-owner occupied	174		1		175		—
Residential	—		79		79		—
Residential - EBO	—		—		—		349
Construction and land development	19		1		20		—
Other	1		—		1		—
Total	$	251	$	148	$	399	$	355

Loans contractually delinquent by 90 days or more and still accruing totaled $355 million at March 31, 2024 and primarily consisted of government guaranteed EBO residential loans.

	December 31, 2023
	Nonaccrual with No Allowance for Credit Loss		Nonaccrual with an Allowance for Credit Loss		Total Nonaccrual		Loans Past Due 90 Days or More and Still Accruing
	(in millions)
Municipal & nonprofit	$	—	$	6	$	6	$	—
Tech & innovation	23		10		33		—
Other commercial and industrial	19		34		53		—
CRE - owner occupied	8		1		9		—
Other CRE - non-owner occupied	82		1		83		—
Residential	—		70		70		—
Residential - EBO	—		—		—		399
Construction and land development	19		—		19		42
Total	$	151	$	122	$	273	$	441

Loans contractually delinquent by 90 days or more and still accruing totaled $441 million at December 31, 2023 and consisted of government guaranteed EBO residential loans and construction and land development loans.

The reduction in interest income associated with loans on nonaccrual status was approximately $4.9 million and $0.8 million for the three months ended March 31, 2024 and 2023.

The following table presents an aging analysis of past due loans by loan portfolio segment:

	March 31, 2024
	Current		30-59 Days Past Due		60-89 Days Past Due		Over 90 days Past Due		Total Past Due		Total
	(in millions)
Warehouse lending	$	6,915	$	—	$	—	$	—	$	—	$	6,915
Municipal & nonprofit	1,622		—		—		—		—		1,622
Tech & innovation	2,941		—		—		—		—		2,941
Equity fund resources	695		—		—		—		—		695
Other commercial and industrial	7,743		5		—		6		11		7,754
CRE - owner occupied	1,706		—		1		—		1		1,707
Hotel franchise finance	3,556		—		—		—		—		3,556
Other CRE - non-owner occupied	6,339		26		—		—		26		6,365
Residential	13,002		66		10		—		76		13,078
Residential - EBO	598		138		86		349		573		1,171
Construction and land development	4,741		5		—		—		5		4,746
Other	147		3		—		—		3		150
Total loans	$	50,005	$	243	$	97	$	355	$	695	$	50,700

	December 31, 2023
	Current		30-59 Days Past Due		60-89 Days Past Due		Over 90 days Past Due		Total Past Due		Total
	(in millions)
Warehouse lending	$	6,618	$	—	$	—	$	—	$	—	$	6,618
Municipal & nonprofit	1,554		—		—		—		—		1,554
Tech & innovation	2,808		—		—		—		—		2,808
Equity fund resources	845		—		—		—		—		845
Other commercial and industrial	7,439		13		—		—		13		7,452
CRE - owner occupied	1,627		—		31		—		31		1,658
Hotel franchise finance	3,824		15		16		—		31		3,855
Other CRE - non-owner occupied	5,974		—		—		—		—		5,974
Residential	13,199		68		20		—		88		13,287
Residential - EBO	545		173		106		399		678		1,223
Construction and land development	4,820		—		—		42		42		4,862
Other	160		1		—		—		1		161
Total loans	$	49,413	$	270	$	173	$	441	$	884	$	50,297

Credit Quality Indicators

The Company categorizes loans into risk categories based on relevant information about the ability of borrowers to service their debt such as current financial information, historical payment experience, credit documentation, public information, and current economic trends, among other factors. The Company analyzes loans individually to classify the loans as to credit risk. This analysis is performed on a quarterly basis. The following tables present risk ratings by loan portfolio segment and origination year. The origination year is the year of origination or renewal.

	Term Loan Amortized Cost Basis by Origination Year												Revolving Loans Amortized Cost Basis		Total
As of and for the three months ended March 31, 2024	2024		2023		2022		2021		2020		Prior
	(in millions)
Warehouse lending
Pass	$	17	$	550	$	338	$	7	$	285	$	—	$	5,695	$	6,892
Special mention	—		—		23		—		—		—		—		23
Classified	—		—		—		—		—		—		—		—
Total	$	17	$	550	$	361	$	7	$	285	$	—	$	5,695	$	6,915
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Municipal & nonprofit
Pass	$	59	$	113	$	200	$	166	$	168	$	893	$	—	$	1,599
Special mention	—		—		7		—		11		—		—		18
Classified	—		—		—		—		—		5		—		5
Total	$	59	$	113	$	207	$	166	$	179	$	898	$	—	$	1,622
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Tech & innovation
Pass	$	256	$	756	$	650	$	171	$	25	$	101	$	815	$	2,774
Special mention	—		9		30		10		—		—		8		57
Classified	—		13		50		1		5		—		41		110
Total	$	256	$	778	$	730	$	182	$	30	$	101	$	864	$	2,941
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Equity fund resources
Pass	$	19	$	78	$	92	$	40	$	2	$	—	$	463	$	694
Special mention	—		—		—		—		—		—		—		—
Classified	—		—		—		—		1		—		—		1
Total	$	19	$	78	$	92	$	40	$	3	$	—	$	463	$	695
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Other commercial and industrial
Pass	$	570	$	1,533	$	1,348	$	503	$	153	$	236	$	3,242	$	7,585
Special mention	—		—		1		—		—		1		—		2
Classified	1		88		24		48		1		4		1		167
Total	$	571	$	1,621	$	1,373	$	551	$	154	$	241	$	3,243	$	7,754
Current period gross charge-offs	$	—	$	—	$	0.1	$	2.0	$	—	$	0.1	$	0.1	$	2.3
CRE - owner occupied
Pass	$	35	$	180	$	377	$	320	$	155	$	551	$	40	$	1,658
Special mention	—		—		2		—		—		—		—		2
Classified	—		2		1		4		1		39		—		47
Total	$	35	$	182	$	380	$	324	$	156	$	590	$	40	$	1,707
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Hotel franchise finance
Pass	$	97	$	563	$	1,449	$	474	$	94	$	571	$	132	$	3,380
Special mention	—		34		—		67		—		—		—		101
Classified	—		—		—		20		—		55		—		75
Total	$	97	$	597	$	1,449	$	561	$	94	$	626	$	132	$	3,556
Current period gross charge-offs	$	—	$	—	$	—	$	1.4	$	—	$	1.5	$	—	$	2.9

	Term Loan Amortized Cost Basis by Origination Year												Revolving Loans Amortized Cost Basis		Total
As of and for the three months ended March 31, 2024	2024		2023		2022		2021		2020		Prior
	(in millions)
Other CRE - non-owner occupied
Pass	$	452	$	1,678	$	1,862	$	780	$	413	$	346	$	446	$	5,977
Special mention	—		94		49		—		40		—		—		183
Classified	—		98		—		93		1		13		—		205
Total	$	452	$	1,870	$	1,911	$	873	$	454	$	359	$	446	$	6,365
Current period gross charge-offs	$	—	$	—	$	—	$	5.0	$	—	$	—	$	—	$	5.0
Residential
Pass	$	78	$	278	$	3,513	$	7,890	$	805	$	458	$	23	$	13,045
Special mention	—		—		—		—		—		—		—		—
Classified	—		—		32		35		5		7		—		79
Cumulative fair value hedging adjustment	—		—		—		—		—		—		—		(46)
Total	$	78	$	278	$	3,545	$	7,925	$	810	$	465	$	23	$	13,078
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Residential - EBO
Pass	$	—	$	11	$	17	$	220	$	513	$	410	$	—	$	1,171
Special mention	—		—		—		—		—		—		—		—
Classified	—		—		—		—		—		—		—		—
Total	$	—	$	11	$	17	$	220	$	513	$	410	$	—	$	1,171
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Construction and land development
Pass	$	68	$	906	$	2,085	$	325	$	11	$	—	$	1,276	$	4,671
Special mention	—		—		5		—		—		—		—		5
Classified	—		—		19		—		51		—		—		70
Total	$	68	$	906	$	2,109	$	325	$	62	$	—	$	1,276	$	4,746
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Other
Pass	$	2	$	1	$	10	$	2	$	11	$	68	$	52	$	146
Special mention	—		—		—		—		—		3		—		3
Classified	—		—		—		—		—		1		—		1
Total	$	2	$	1	$	10	$	2	$	11	$	72	$	52	$	150
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Total by Risk Category
Pass	$	1,653	$	6,647	$	11,941	$	10,898	$	2,635	$	3,634	$	12,184	$	49,592
Special mention	—		137		117		77		51		4		8		394
Classified	1		201		126		201		65		124		42		760
Cumulative fair value hedging adjustment	—		—		—		—		—		—		—		(46)
Total	$	1,654	$	6,985	$	12,184	$	11,176	$	2,751	$	3,762	$	12,234	$	50,700
Current period gross charge-offs	$	—	$	—	$	0.1	$	8.4	$	—	$	1.6	$	0.1	$	10.2

	Term Loan Amortized Cost Basis by Origination Year												Revolving Loans Amortized Cost Basis		Total
As of December 31, 2023 and gross charge-offs for the three months ended March 31, 2023	2023		2022		2021		2020		2019		Prior
	(in millions)
Warehouse lending
Pass	$	582	$	323	$	7	$	289	$	—	$	—	$	5,391	$	6,592
Special mention	—		—		—		—		—		—		26		26
Classified	—		—		—		—		—		—		—		—
Total	$	582	$	323	$	7	$	289	$	—	$	—	$	5,417	$	6,618
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Municipal & nonprofit
Pass	$	102	$	167	$	176	$	169	$	68	$	848	$	—	$	1,530
Special mention	—		7		—		11		—		—		—		18
Classified	—		—		—		—		6		—		—		6
Total	$	102	$	174	$	176	$	180	$	74	$	848	$	—	$	1,554
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Tech & innovation
Pass	$	758	$	774	$	206	$	22	$	66	$	38	$	816	$	2,680
Special mention	5		30		12		—		—		—		1		48
Classified	15		52		1		5		—		—		7		80
Total	$	778	$	856	$	219	$	27	$	66	$	38	$	824	$	2,808
Current period gross charge-offs	$	1.8	$	—	$	—	$	—	$	—	$	—	$	—	$	1.8
Equity fund resources
Pass	$	154	$	62	$	21	$	3	$	1	$	—	$	604	$	845
Special mention	—		—		—		—		—		—		—		—
Classified	—		—		—		—		—		—		—		—
Total	$	154	$	62	$	21	$	3	$	1	$	—	$	604	$	845
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Other commercial and industrial
Pass	$	1,610	$	1,454	$	559	$	185	$	77	$	196	$	3,186	$	7,267
Special mention	90		1		1		—		—		—		1		93
Classified	1		25		59		2		4		—		1		92
Total	$	1,701	$	1,480	$	619	$	187	$	81	$	196	$	3,188	$	7,452
Current period gross charge-offs	$	—	$	—	$	5.9	$	1.2	$	—	$	0.1	$	0.1	$	7.3
CRE - owner occupied
Pass	$	165	$	344	$	322	$	163	$	132	$	444	$	40	$	1,610
Special mention	—		—		—		—		—		1		—		1
Classified	2		1		4		1		1		38		—		47
Total	$	167	$	345	$	326	$	164	$	133	$	483	$	40	$	1,658
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Hotel franchise finance
Pass	$	593	$	1,535	$	566	$	95	$	419	$	165	$	132	$	3,505
Special mention	34		—		66		—		35		68		—		203
Classified	24		8		48		—		43		24		—		147
Total	$	651	$	1,543	$	680	$	95	$	497	$	257	$	132	$	3,855
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Other CRE - non-owner occupied
Pass	$	1,832	$	1,784	$	754	$	457	$	166	$	206	$	387	$	5,586
Special mention	164		—		16		43		28		—		—		251
Classified	28		—		93		1		14		1		—		137
Total	$	2,024	$	1,784	$	863	$	501	$	208	$	207	$	387	$	5,974
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—

	Term Loan Amortized Cost Basis by Origination Year												Revolving Loans Amortized Cost Basis		Total
As of December 31, 2023 and gross charge-offs for the three months ended March 31, 2023	2023		2022		2021		2020		2019		Prior
	(in millions)
Residential
Pass	$	324	$	3,573	$	7,985	$	819	$	270	$	207	$	20	$	13,198
Special mention	—		—		—		—		—		—		—		—
Classified	1		26		33		4		4		2		—		70
Cumulative fair value hedging adjustment	—		—		—		—		—		—		—		19
Total	$	325	$	3,599	$	8,018	$	823	$	274	$	209	$	20	$	13,287
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Residential - EBO
Pass	$	2	$	8	$	227	$	534	$	231	$	221	$	—	$	1,223
Special mention	—		—		—		—		—		—		—		—
Classified	—		—		—		—		—		—		—		—
Total	$	2	$	8	$	227	$	534	$	231	$	221	$	—	$	1,223
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Construction and land development
Pass	$	1,013	$	2,231	$	385	$	10	$	—	$	—	$	1,151	$	4,790
Special mention	—		—		—		—		—		—		—		—
Classified	1		19		—		52		—		—		—		72
Total	$	1,014	$	2,250	$	385	$	62	$	—	$	—	$	1,151	$	4,862
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Other
Pass	$	4	$	10	$	3	$	11	$	3	$	62	$	66	$	159
Special mention	—		—		—		—		—		1		—		1
Classified	—		—		—		—		—		1		—		1
Total	$	4	$	10	$	3	$	11	$	3	$	64	$	66	$	161
Current period gross charge-offs	$	—	$	0.1	$	—	$	—	$	—	$	—	$	—	$	0.1
Total by Risk Category
Pass	$	7,139	$	12,265	$	11,211	$	2,757	$	1,433	$	2,387	$	11,793	$	48,985
Special mention	293		38		95		54		63		70		28		641
Classified	72		131		238		65		72		66		8		652
Cumulative fair value hedging adjustment	—		—		—		—		—		—		—		19
Total	$	7,504	$	12,434	$	11,544	$	2,876	$	1,568	$	2,523	$	11,829	$	50,297
Current period gross charge-offs	$	1.8	$	0.1	$	5.9	$	1.2	$	—	$	0.1	$	0.1	$	9.2

Restructurings for Borrowers Experiencing Financial Difficulty

The following tables present loan modifications during the period to borrowers experiencing financial difficulty:

	Amortized Cost Basis at March 31, 2024
	Payment Delay and Term Extension		Term Extension		Payment Delay		Total		% of Total Class of Financing Receivable
Three Months Ended	(dollars in millions)
Tech & innovation	$	—	$	—	$	30	$	30	1.0	%
Other commercial and industrial	—		8		—		8		0.1
CRE - owner occupied	—		31		—		31		1.8
Construction and land development	—		39		—		39		0.8
Total	$	—	$	78	$	30	$	108	0.2	%

	Amortized Cost Basis at March 31, 2023
	Payment Delay and Term Extension		Term Extension		Payment Delay		Total		% of Total Class of Financing Receivable
Three Months Ended	(dollars in millions)
Tech & innovation	$	2	$	—	$	5	$	7	0.3	%
Hotel franchise finance	—		18		—		18		0.5	%
Residential	—		—		1		1		0.0	%
Total	$	2	$	18	$	6	$	26	0.1	%

The performance of these modified loans is monitored for 12 months following the modification. As of March 31, 2024, modified loans of $129 million were current with contractual payments and $129 million were on nonaccrual status. As of December 31, 2023, modified loans of $95 million were current with contractual payments and $111 million were on nonaccrual status.

In the normal course of business, the Company also modifies EBO loans, which are delinquent FHA, VA, or USDA insured or guaranteed loans repurchased under the terms of the GNMA MBS program and can be repooled or resold when loans are brought current. During the three months ended March 31, 2024 and 2023, the Company completed modifications of EBO loans with an amortized cost of $90 million and $57 million, respectively. These modifications were largely payment delays and term extensions. Certain of these loans were repooled or resold after modification and are no longer included in the pool of loan modifications being monitored for future performance. As of March 31, 2024, modified EBO loans consisted of $38 million in loans that were current to 89 days delinquent and $12 million in loans greater than 90 days delinquent. As of December 31, 2023, modified EBO loans consisted of $26 million in loans that were current to 89 days delinquent and $12 million in loans greater than 90 days delinquent.

Collateral-Dependent Loans

The following table presents the amortized cost basis of collateral-dependent loans by loan portfolio segment:

	March 31, 2024						December 31, 2023
	Real Estate Collateral		Other Collateral		Total		Real Estate Collateral		Other Collateral		Total
	(in millions)
Municipal & nonprofit	$	—	$	5	$	5	$	—	$	6	$	6
Tech & innovation	—		35		35		—		—		—
Other commercial and industrial	—		26		26		—		29		29
CRE - owner occupied	42		—		42		43		—		43
Hotel franchise finance	63		—		63		104		—		104
Other CRE - non-owner occupied	204		—		204		136		—		136
Construction and land development	69		—		69		71		—		71
Total	$	378	$	66	$	444	$	354	$	35	$	389

The Company did not identify any significant changes in the extent to which collateral secures its collateral dependent loans, whether in the form of general deterioration or from other factors during the period ended March 31, 2024.

Allowance for Credit Losses

The ACL consists of the ACL on funded loans HFI and an ACL on unfunded loan commitments. The ACL on HTM securities is estimated separately from loans, see "Note 2. Investment Securities" of these Notes to Unaudited Consolidated Financial Statements for further discussion. Management considers the level of ACL to be a reasonable and supportable estimate of expected credit losses inherent within the Company's HFI loan portfolio as of March 31, 2024.

The below tables reflect the activity in the ACL on loans HFI by loan portfolio segment, which includes an estimate of future recoveries:

	Three Months Ended March 31, 2024
	Balance, December 31, 2023		Provision for (Recovery of) Credit Losses		Charge-offs		Recoveries		Balance, March 31, 2024
	(in millions)
Warehouse lending	$	5.8	$	1.5	$	—	$	—	$	7.3
Municipal & nonprofit	14.7		(0.8)		—		—		13.9
Tech & innovation	42.1		5.9		—		—		48.0
Equity fund resources	1.3		(0.1)		—		—		1.2
Other commercial and industrial	81.4		(12.4)		2.3		(0.4)		67.1
CRE - owner occupied	6.0		0.2		—		—		6.2
Hotel franchise finance	33.4		5.3		2.9		—		35.8
Other CRE - non-owner occupied	96.0		13.7		5.0		—		104.7
Residential	23.1		(1.0)		—		—		22.1
Residential - EBO	—		—		—		—		—
Construction and land development	30.4		1.5		—		—		31.9
Other	2.5		(0.4)		—		—		2.1
Total	$	336.7	$	13.4	$	10.2	$	(0.4)	$	340.3

	Three Months Ended March 31, 2023
	Balance, December 31, 2022		Provision for (Recovery of) Credit Losses		Charge-offs		Recoveries		Balance, March 31, 2023
	(in millions)
Warehouse lending	$	8.4	$	(1.8)	$	—	$	—	$	6.6
Municipal & nonprofit	15.9		2.5		—		—		18.4
Tech & innovation	30.8		7.4		1.8		—		36.4
Equity fund resources	6.4		(3.1)		—		—		3.3
Other commercial and industrial	85.9		(30.7)		7.3		(3.2)		51.1
CRE - owner occupied	7.1		1.5		—		—		8.6
Hotel franchise finance	46.9		0.8		—		—		47.7
Other CRE - non-owner occupied	47.4		19.0		—		—		66.4
Residential	30.4		1.3		—		—		31.7
Residential - EBO	—		—		—		—		—
Construction and land development	27.4		4.1		—		—		31.5
Other	3.1		—		0.1		—		3.0
Total	$	309.7	$	1.0	$	9.2	$	(3.2)	$	304.7

Accrued interest receivable of $278 million and $281 million at March 31, 2024 and December 31, 2023, respectively, was excluded from the estimate of credit losses. Whereas, accrued interest receivable related to the Company's Residential-EBO loan portfolio segment was included in the estimate of credit losses and had an allowance of $3 million and $4 million as of March 31, 2024 and December 31, 2023, respectively. Accrued interest receivable, net of any allowance, is included in Other assets on the Consolidated Balance Sheet.

In addition to the ACL on funded loans HFI, the Company maintains a separate ACL related to off-balance sheet credit exposures, including unfunded loan commitments. This allowance is included in Other liabilities on the Consolidated Balance Sheet.

The below table reflects the activity in the ACL on unfunded loan commitments:

	Three Months Ended March 31,
	2024		2023
	(in millions)
Balance, beginning of period	$	31.6	$	47.0
Provision for (Recovery of) credit losses	1.5		(2.2)
Balance, end of period	$	33.1	$	44.8

The following tables disaggregate the Company's ACL on funded loans HFI and loan balances by measurement methodology:

	March 31, 2024
	Loans						Allowance
	Collectively Evaluated for Credit Loss		Individually Evaluated for Credit Loss		Total		Collectively Evaluated for Credit Loss		Individually Evaluated for Credit Loss		Total
	(in millions)
Warehouse lending	$	6,915	$	—	$	6,915	$	7.3	$	—	$	7.3
Municipal & nonprofit	1,617		5		1,622		13.2		0.7		13.9
Tech & innovation	2,832		109		2,941		40.8		7.2		48.0
Equity fund resources	695		—		695		1.2		—		1.2
Other commercial and industrial	7,591		163		7,754		62.5		4.6		67.1
CRE - owner occupied	1,664		43		1,707		6.2		—		6.2
Hotel franchise finance	3,481		75		3,556		35.4		0.4		35.8
Other CRE - non-owner occupied	6,161		204		6,365		104.7		—		104.7
Residential	13,078		—		13,078		22.1		—		22.1
Residential EBO	1,171		—		1,171		—		—		—
Construction and land development	4,676		70		4,746		31.9		—		31.9
Other	149		1		150		2.1		—		2.1
Total	$	50,030	$	670	$	50,700	$	327.4	$	12.9	$	340.3

	December 31, 2023
	Loans						Allowance
	Collectively Evaluated for Credit Loss		Individually Evaluated for Credit Loss		Total		Collectively Evaluated for Credit Loss		Individually Evaluated for Credit Loss		Total
	(in millions)
Warehouse lending	$	6,618	$	—	$	6,618	$	5.8	$	—	$	5.8
Municipal & nonprofit	1,548		6		1,554		13.7		1.0		14.7
Tech & innovation	2,729		79		2,808		38.3		3.8		42.1
Equity fund resources	845		—		845		1.3		—		1.3
Other commercial and industrial	7,362		90		7,452		64.6		16.8		81.4
CRE - owner occupied	1,613		45		1,658		6.0		—		6.0
Hotel franchise finance	3,708		147		3,855		33.4		—		33.4
Other CRE - non-owner occupied	5,838		136		5,974		96.0		—		96.0
Residential	13,287		—		13,287		23.1		—		23.1
Residential EBO	1,223		—		1,223		—		—		—
Construction and land development	4,791		71		4,862		30.4		—		30.4
Other	161		—		161		2.5		—		2.5
Total	$	49,723	$	574	$	50,297	$	315.1	$	21.6	$	336.7

Loan Purchases and Sales

During the three months ended March 31, 2024 and 2023, loan purchases totaled $389 million and $511 million, respectively, and consisted primarily of commercial and industrial and residential loans. There were no loans purchased with more-than-insignificant deterioration in credit quality during the three months ended March 31, 2024 and 2023.

During the three months ended March 31, 2024, the Company sold loans with a carrying value of approximately $148 million and recognized a charge-off of $1.4 million and a net loss of $4.9 million on these loan sales. During the three months ended March 31, 2023, the Company transferred $6.9 billion of loans HFI (primarily commercial and industrial loans) to HFS and sold $915 million of those loans. The Company recognized a net loss of $140.8 million on these loan transfers and sales during the three months ended March 31, 2023.

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Loans, Leases and Allowance for Credit Losses

3 Months Ended

Mar. 31, 2024

Receivables [Abstract]

Loans, Leases and Allowance for Credit Losses

3. LOANS HELD FOR SALE

The Company purchases and originates residential mortgage loans through its AmeriHome mortgage banking business channel that are held for sale or securitization.

The following is a summary of loans HFS by type:

	March 31, 2024		December 31, 2023
	(in millions)
Government-insured or guaranteed:
EBO (1)	$	—	$	2
Non-EBO	764		498
Total government-insured or guaranteed	764		500
Agency-conforming	1,067		899
Non-agency	10		3
Total loans HFS	$	1,841	$	1,402

(1)    EBO loans are delinquent FHA, VA, or USDA loans purchased from GNMA pools under the terms of the GNMA MBS program that can be repooled when loans are brought current either through the borrower's reperformance or through completion of a loan modification.

The following is a summary of the net gain on loan purchase, origination, and sale activities on residential mortgage loans to be sold or securitized:

	Three Months Ended March 31,
	2024		2023
	(in millions)
Mortgage servicing rights capitalized upon sale of loans	$	188.7	$	142.4
Net proceeds from sale of loans (1)	(160.7)		(107.4)
Provision for and change in estimate of liability for losses under representations and warranties, net	3.2		2.4
Change in fair value	(6.7)		6.6
Change in fair value of derivatives:
Unrealized gain (loss) on derivatives	15.3		(22.2)
Realized gain on derivatives	(8.1)		(2.4)
Total change in fair value of derivatives	7.2		(24.6)
Net gain on residential mortgage loans HFS	$	31.7	$	19.4
Loan acquisition and origination fees	13.6		12.0
Net gain on loan origination and sale activities	$	45.3	$	31.4

(1)     Represents the difference between cash proceeds received upon settlement and loan basis.

4. LOANS, LEASES AND ALLOWANCE FOR CREDIT LOSSES

The composition of the Company's HFI loan portfolio is as follows:

	March 31, 2024		December 31, 2023
	(in millions)
Warehouse lending	$	6,915	$	6,618
Municipal & nonprofit	1,622		1,554
Tech & innovation	2,941		2,808
Equity fund resources	695		845
Other commercial and industrial	7,754		7,452
CRE - owner occupied	1,707		1,658
Hotel franchise finance	3,556		3,855
Other CRE - non-owner occupied	6,365		5,974
Residential	13,078		13,287
Residential - EBO	1,171		1,223
Construction and land development	4,746		4,862
Other	150		161
Total loans HFI	50,700		50,297
Allowance for credit losses	(340)		(337)
Total loans HFI, net of allowance	$	50,360	$	49,960

Loans classified as HFI are stated at the amount of unpaid principal, adjusted for net deferred fees and costs, premiums and discounts on acquired and purchased loans, and an ACL. Net deferred fees of $102 million and $108 million reduced the carrying value of loans as of March 31, 2024 and December 31, 2023, respectively. Net unamortized purchase premiums on acquired and purchased loans of $175 million and $177 million increased the carrying value of loans as of March 31, 2024 and December 31, 2023, respectively.

Nonaccrual and Past Due Loans

Loans are placed on nonaccrual status when management determines that the full repayment of principal and collection of interest according to contractual terms is no longer likely, generally when the loan becomes 90 days or more past due.

The following tables present nonperforming loan balances by loan portfolio segment:

	March 31, 2024
	Nonaccrual with No Allowance for Credit Loss		Nonaccrual with an Allowance for Credit Loss		Total Nonaccrual		Loans Past Due 90 Days or More and Still Accruing
	(in millions)
Municipal & nonprofit	$	—	$	5	$	5	$	—
Tech & innovation	34		28		62		—
Other commercial and industrial	15		20		35		6
CRE - owner occupied	8		2		10		—
Hotel franchise finance	—		12		12		—
Other CRE - non-owner occupied	174		1		175		—
Residential	—		79		79		—
Residential - EBO	—		—		—		349
Construction and land development	19		1		20		—
Other	1		—		1		—
Total	$	251	$	148	$	399	$	355

Loans contractually delinquent by 90 days or more and still accruing totaled $355 million at March 31, 2024 and primarily consisted of government guaranteed EBO residential loans.

	December 31, 2023
	Nonaccrual with No Allowance for Credit Loss		Nonaccrual with an Allowance for Credit Loss		Total Nonaccrual		Loans Past Due 90 Days or More and Still Accruing
	(in millions)
Municipal & nonprofit	$	—	$	6	$	6	$	—
Tech & innovation	23		10		33		—
Other commercial and industrial	19		34		53		—
CRE - owner occupied	8		1		9		—
Other CRE - non-owner occupied	82		1		83		—
Residential	—		70		70		—
Residential - EBO	—		—		—		399
Construction and land development	19		—		19		42
Total	$	151	$	122	$	273	$	441

Loans contractually delinquent by 90 days or more and still accruing totaled $441 million at December 31, 2023 and consisted of government guaranteed EBO residential loans and construction and land development loans.

The reduction in interest income associated with loans on nonaccrual status was approximately $4.9 million and $0.8 million for the three months ended March 31, 2024 and 2023.

The following table presents an aging analysis of past due loans by loan portfolio segment:

	March 31, 2024
	Current		30-59 Days Past Due		60-89 Days Past Due		Over 90 days Past Due		Total Past Due		Total
	(in millions)
Warehouse lending	$	6,915	$	—	$	—	$	—	$	—	$	6,915
Municipal & nonprofit	1,622		—		—		—		—		1,622
Tech & innovation	2,941		—		—		—		—		2,941
Equity fund resources	695		—		—		—		—		695
Other commercial and industrial	7,743		5		—		6		11		7,754
CRE - owner occupied	1,706		—		1		—		1		1,707
Hotel franchise finance	3,556		—		—		—		—		3,556
Other CRE - non-owner occupied	6,339		26		—		—		26		6,365
Residential	13,002		66		10		—		76		13,078
Residential - EBO	598		138		86		349		573		1,171
Construction and land development	4,741		5		—		—		5		4,746
Other	147		3		—		—		3		150
Total loans	$	50,005	$	243	$	97	$	355	$	695	$	50,700

	December 31, 2023
	Current		30-59 Days Past Due		60-89 Days Past Due		Over 90 days Past Due		Total Past Due		Total
	(in millions)
Warehouse lending	$	6,618	$	—	$	—	$	—	$	—	$	6,618
Municipal & nonprofit	1,554		—		—		—		—		1,554
Tech & innovation	2,808		—		—		—		—		2,808
Equity fund resources	845		—		—		—		—		845
Other commercial and industrial	7,439		13		—		—		13		7,452
CRE - owner occupied	1,627		—		31		—		31		1,658
Hotel franchise finance	3,824		15		16		—		31		3,855
Other CRE - non-owner occupied	5,974		—		—		—		—		5,974
Residential	13,199		68		20		—		88		13,287
Residential - EBO	545		173		106		399		678		1,223
Construction and land development	4,820		—		—		42		42		4,862
Other	160		1		—		—		1		161
Total loans	$	49,413	$	270	$	173	$	441	$	884	$	50,297

Credit Quality Indicators

The Company categorizes loans into risk categories based on relevant information about the ability of borrowers to service their debt such as current financial information, historical payment experience, credit documentation, public information, and current economic trends, among other factors. The Company analyzes loans individually to classify the loans as to credit risk. This analysis is performed on a quarterly basis. The following tables present risk ratings by loan portfolio segment and origination year. The origination year is the year of origination or renewal.

	Term Loan Amortized Cost Basis by Origination Year												Revolving Loans Amortized Cost Basis		Total
As of and for the three months ended March 31, 2024	2024		2023		2022		2021		2020		Prior
	(in millions)
Warehouse lending
Pass	$	17	$	550	$	338	$	7	$	285	$	—	$	5,695	$	6,892
Special mention	—		—		23		—		—		—		—		23
Classified	—		—		—		—		—		—		—		—
Total	$	17	$	550	$	361	$	7	$	285	$	—	$	5,695	$	6,915
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Municipal & nonprofit
Pass	$	59	$	113	$	200	$	166	$	168	$	893	$	—	$	1,599
Special mention	—		—		7		—		11		—		—		18
Classified	—		—		—		—		—		5		—		5
Total	$	59	$	113	$	207	$	166	$	179	$	898	$	—	$	1,622
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Tech & innovation
Pass	$	256	$	756	$	650	$	171	$	25	$	101	$	815	$	2,774
Special mention	—		9		30		10		—		—		8		57
Classified	—		13		50		1		5		—		41		110
Total	$	256	$	778	$	730	$	182	$	30	$	101	$	864	$	2,941
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Equity fund resources
Pass	$	19	$	78	$	92	$	40	$	2	$	—	$	463	$	694
Special mention	—		—		—		—		—		—		—		—
Classified	—		—		—		—		1		—		—		1
Total	$	19	$	78	$	92	$	40	$	3	$	—	$	463	$	695
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Other commercial and industrial
Pass	$	570	$	1,533	$	1,348	$	503	$	153	$	236	$	3,242	$	7,585
Special mention	—		—		1		—		—		1		—		2
Classified	1		88		24		48		1		4		1		167
Total	$	571	$	1,621	$	1,373	$	551	$	154	$	241	$	3,243	$	7,754
Current period gross charge-offs	$	—	$	—	$	0.1	$	2.0	$	—	$	0.1	$	0.1	$	2.3
CRE - owner occupied
Pass	$	35	$	180	$	377	$	320	$	155	$	551	$	40	$	1,658
Special mention	—		—		2		—		—		—		—		2
Classified	—		2		1		4		1		39		—		47
Total	$	35	$	182	$	380	$	324	$	156	$	590	$	40	$	1,707
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Hotel franchise finance
Pass	$	97	$	563	$	1,449	$	474	$	94	$	571	$	132	$	3,380
Special mention	—		34		—		67		—		—		—		101
Classified	—		—		—		20		—		55		—		75
Total	$	97	$	597	$	1,449	$	561	$	94	$	626	$	132	$	3,556
Current period gross charge-offs	$	—	$	—	$	—	$	1.4	$	—	$	1.5	$	—	$	2.9

	Term Loan Amortized Cost Basis by Origination Year												Revolving Loans Amortized Cost Basis		Total
As of and for the three months ended March 31, 2024	2024		2023		2022		2021		2020		Prior
	(in millions)
Other CRE - non-owner occupied
Pass	$	452	$	1,678	$	1,862	$	780	$	413	$	346	$	446	$	5,977
Special mention	—		94		49		—		40		—		—		183
Classified	—		98		—		93		1		13		—		205
Total	$	452	$	1,870	$	1,911	$	873	$	454	$	359	$	446	$	6,365
Current period gross charge-offs	$	—	$	—	$	—	$	5.0	$	—	$	—	$	—	$	5.0
Residential
Pass	$	78	$	278	$	3,513	$	7,890	$	805	$	458	$	23	$	13,045
Special mention	—		—		—		—		—		—		—		—
Classified	—		—		32		35		5		7		—		79
Cumulative fair value hedging adjustment	—		—		—		—		—		—		—		(46)
Total	$	78	$	278	$	3,545	$	7,925	$	810	$	465	$	23	$	13,078
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Residential - EBO
Pass	$	—	$	11	$	17	$	220	$	513	$	410	$	—	$	1,171
Special mention	—		—		—		—		—		—		—		—
Classified	—		—		—		—		—		—		—		—
Total	$	—	$	11	$	17	$	220	$	513	$	410	$	—	$	1,171
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Construction and land development
Pass	$	68	$	906	$	2,085	$	325	$	11	$	—	$	1,276	$	4,671
Special mention	—		—		5		—		—		—		—		5
Classified	—		—		19		—		51		—		—		70
Total	$	68	$	906	$	2,109	$	325	$	62	$	—	$	1,276	$	4,746
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Other
Pass	$	2	$	1	$	10	$	2	$	11	$	68	$	52	$	146
Special mention	—		—		—		—		—		3		—		3
Classified	—		—		—		—		—		1		—		1
Total	$	2	$	1	$	10	$	2	$	11	$	72	$	52	$	150
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Total by Risk Category
Pass	$	1,653	$	6,647	$	11,941	$	10,898	$	2,635	$	3,634	$	12,184	$	49,592
Special mention	—		137		117		77		51		4		8		394
Classified	1		201		126		201		65		124		42		760
Cumulative fair value hedging adjustment	—		—		—		—		—		—		—		(46)
Total	$	1,654	$	6,985	$	12,184	$	11,176	$	2,751	$	3,762	$	12,234	$	50,700
Current period gross charge-offs	$	—	$	—	$	0.1	$	8.4	$	—	$	1.6	$	0.1	$	10.2

	Term Loan Amortized Cost Basis by Origination Year												Revolving Loans Amortized Cost Basis		Total
As of December 31, 2023 and gross charge-offs for the three months ended March 31, 2023	2023		2022		2021		2020		2019		Prior
	(in millions)
Warehouse lending
Pass	$	582	$	323	$	7	$	289	$	—	$	—	$	5,391	$	6,592
Special mention	—		—		—		—		—		—		26		26
Classified	—		—		—		—		—		—		—		—
Total	$	582	$	323	$	7	$	289	$	—	$	—	$	5,417	$	6,618
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Municipal & nonprofit
Pass	$	102	$	167	$	176	$	169	$	68	$	848	$	—	$	1,530
Special mention	—		7		—		11		—		—		—		18
Classified	—		—		—		—		6		—		—		6
Total	$	102	$	174	$	176	$	180	$	74	$	848	$	—	$	1,554
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Tech & innovation
Pass	$	758	$	774	$	206	$	22	$	66	$	38	$	816	$	2,680
Special mention	5		30		12		—		—		—		1		48
Classified	15		52		1		5		—		—		7		80
Total	$	778	$	856	$	219	$	27	$	66	$	38	$	824	$	2,808
Current period gross charge-offs	$	1.8	$	—	$	—	$	—	$	—	$	—	$	—	$	1.8
Equity fund resources
Pass	$	154	$	62	$	21	$	3	$	1	$	—	$	604	$	845
Special mention	—		—		—		—		—		—		—		—
Classified	—		—		—		—		—		—		—		—
Total	$	154	$	62	$	21	$	3	$	1	$	—	$	604	$	845
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Other commercial and industrial
Pass	$	1,610	$	1,454	$	559	$	185	$	77	$	196	$	3,186	$	7,267
Special mention	90		1		1		—		—		—		1		93
Classified	1		25		59		2		4		—		1		92
Total	$	1,701	$	1,480	$	619	$	187	$	81	$	196	$	3,188	$	7,452
Current period gross charge-offs	$	—	$	—	$	5.9	$	1.2	$	—	$	0.1	$	0.1	$	7.3
CRE - owner occupied
Pass	$	165	$	344	$	322	$	163	$	132	$	444	$	40	$	1,610
Special mention	—		—		—		—		—		1		—		1
Classified	2		1		4		1		1		38		—		47
Total	$	167	$	345	$	326	$	164	$	133	$	483	$	40	$	1,658
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Hotel franchise finance
Pass	$	593	$	1,535	$	566	$	95	$	419	$	165	$	132	$	3,505
Special mention	34		—		66		—		35		68		—		203
Classified	24		8		48		—		43		24		—		147
Total	$	651	$	1,543	$	680	$	95	$	497	$	257	$	132	$	3,855
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Other CRE - non-owner occupied
Pass	$	1,832	$	1,784	$	754	$	457	$	166	$	206	$	387	$	5,586
Special mention	164		—		16		43		28		—		—		251
Classified	28		—		93		1		14		1		—		137
Total	$	2,024	$	1,784	$	863	$	501	$	208	$	207	$	387	$	5,974
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—

	Term Loan Amortized Cost Basis by Origination Year												Revolving Loans Amortized Cost Basis		Total
As of December 31, 2023 and gross charge-offs for the three months ended March 31, 2023	2023		2022		2021		2020		2019		Prior
	(in millions)
Residential
Pass	$	324	$	3,573	$	7,985	$	819	$	270	$	207	$	20	$	13,198
Special mention	—		—		—		—		—		—		—		—
Classified	1		26		33		4		4		2		—		70
Cumulative fair value hedging adjustment	—		—		—		—		—		—		—		19
Total	$	325	$	3,599	$	8,018	$	823	$	274	$	209	$	20	$	13,287
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Residential - EBO
Pass	$	2	$	8	$	227	$	534	$	231	$	221	$	—	$	1,223
Special mention	—		—		—		—		—		—		—		—
Classified	—		—		—		—		—		—		—		—
Total	$	2	$	8	$	227	$	534	$	231	$	221	$	—	$	1,223
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Construction and land development
Pass	$	1,013	$	2,231	$	385	$	10	$	—	$	—	$	1,151	$	4,790
Special mention	—		—		—		—		—		—		—		—
Classified	1		19		—		52		—		—		—		72
Total	$	1,014	$	2,250	$	385	$	62	$	—	$	—	$	1,151	$	4,862
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Other
Pass	$	4	$	10	$	3	$	11	$	3	$	62	$	66	$	159
Special mention	—		—		—		—		—		1		—		1
Classified	—		—		—		—		—		1		—		1
Total	$	4	$	10	$	3	$	11	$	3	$	64	$	66	$	161
Current period gross charge-offs	$	—	$	0.1	$	—	$	—	$	—	$	—	$	—	$	0.1
Total by Risk Category
Pass	$	7,139	$	12,265	$	11,211	$	2,757	$	1,433	$	2,387	$	11,793	$	48,985
Special mention	293		38		95		54		63		70		28		641
Classified	72		131		238		65		72		66		8		652
Cumulative fair value hedging adjustment	—		—		—		—		—		—		—		19
Total	$	7,504	$	12,434	$	11,544	$	2,876	$	1,568	$	2,523	$	11,829	$	50,297
Current period gross charge-offs	$	1.8	$	0.1	$	5.9	$	1.2	$	—	$	0.1	$	0.1	$	9.2

Restructurings for Borrowers Experiencing Financial Difficulty

The following tables present loan modifications during the period to borrowers experiencing financial difficulty:

	Amortized Cost Basis at March 31, 2024
	Payment Delay and Term Extension		Term Extension		Payment Delay		Total		% of Total Class of Financing Receivable
Three Months Ended	(dollars in millions)
Tech & innovation	$	—	$	—	$	30	$	30	1.0	%
Other commercial and industrial	—		8		—		8		0.1
CRE - owner occupied	—		31		—		31		1.8
Construction and land development	—		39		—		39		0.8
Total	$	—	$	78	$	30	$	108	0.2	%

	Amortized Cost Basis at March 31, 2023
	Payment Delay and Term Extension		Term Extension		Payment Delay		Total		% of Total Class of Financing Receivable
Three Months Ended	(dollars in millions)
Tech & innovation	$	2	$	—	$	5	$	7	0.3	%
Hotel franchise finance	—		18		—		18		0.5	%
Residential	—		—		1		1		0.0	%
Total	$	2	$	18	$	6	$	26	0.1	%

The performance of these modified loans is monitored for 12 months following the modification. As of March 31, 2024, modified loans of $129 million were current with contractual payments and $129 million were on nonaccrual status. As of December 31, 2023, modified loans of $95 million were current with contractual payments and $111 million were on nonaccrual status.

In the normal course of business, the Company also modifies EBO loans, which are delinquent FHA, VA, or USDA insured or guaranteed loans repurchased under the terms of the GNMA MBS program and can be repooled or resold when loans are brought current. During the three months ended March 31, 2024 and 2023, the Company completed modifications of EBO loans with an amortized cost of $90 million and $57 million, respectively. These modifications were largely payment delays and term extensions. Certain of these loans were repooled or resold after modification and are no longer included in the pool of loan modifications being monitored for future performance. As of March 31, 2024, modified EBO loans consisted of $38 million in loans that were current to 89 days delinquent and $12 million in loans greater than 90 days delinquent. As of December 31, 2023, modified EBO loans consisted of $26 million in loans that were current to 89 days delinquent and $12 million in loans greater than 90 days delinquent.

Collateral-Dependent Loans

The following table presents the amortized cost basis of collateral-dependent loans by loan portfolio segment:

	March 31, 2024						December 31, 2023
	Real Estate Collateral		Other Collateral		Total		Real Estate Collateral		Other Collateral		Total
	(in millions)
Municipal & nonprofit	$	—	$	5	$	5	$	—	$	6	$	6
Tech & innovation	—		35		35		—		—		—
Other commercial and industrial	—		26		26		—		29		29
CRE - owner occupied	42		—		42		43		—		43
Hotel franchise finance	63		—		63		104		—		104
Other CRE - non-owner occupied	204		—		204		136		—		136
Construction and land development	69		—		69		71		—		71
Total	$	378	$	66	$	444	$	354	$	35	$	389

The Company did not identify any significant changes in the extent to which collateral secures its collateral dependent loans, whether in the form of general deterioration or from other factors during the period ended March 31, 2024.

Allowance for Credit Losses

The ACL consists of the ACL on funded loans HFI and an ACL on unfunded loan commitments. The ACL on HTM securities is estimated separately from loans, see "Note 2. Investment Securities" of these Notes to Unaudited Consolidated Financial Statements for further discussion. Management considers the level of ACL to be a reasonable and supportable estimate of expected credit losses inherent within the Company's HFI loan portfolio as of March 31, 2024.

The below tables reflect the activity in the ACL on loans HFI by loan portfolio segment, which includes an estimate of future recoveries:

	Three Months Ended March 31, 2024
	Balance, December 31, 2023		Provision for (Recovery of) Credit Losses		Charge-offs		Recoveries		Balance, March 31, 2024
	(in millions)
Warehouse lending	$	5.8	$	1.5	$	—	$	—	$	7.3
Municipal & nonprofit	14.7		(0.8)		—		—		13.9
Tech & innovation	42.1		5.9		—		—		48.0
Equity fund resources	1.3		(0.1)		—		—		1.2
Other commercial and industrial	81.4		(12.4)		2.3		(0.4)		67.1
CRE - owner occupied	6.0		0.2		—		—		6.2
Hotel franchise finance	33.4		5.3		2.9		—		35.8
Other CRE - non-owner occupied	96.0		13.7		5.0		—		104.7
Residential	23.1		(1.0)		—		—		22.1
Residential - EBO	—		—		—		—		—
Construction and land development	30.4		1.5		—		—		31.9
Other	2.5		(0.4)		—		—		2.1
Total	$	336.7	$	13.4	$	10.2	$	(0.4)	$	340.3

	Three Months Ended March 31, 2023
	Balance, December 31, 2022		Provision for (Recovery of) Credit Losses		Charge-offs		Recoveries		Balance, March 31, 2023
	(in millions)
Warehouse lending	$	8.4	$	(1.8)	$	—	$	—	$	6.6
Municipal & nonprofit	15.9		2.5		—		—		18.4
Tech & innovation	30.8		7.4		1.8		—		36.4
Equity fund resources	6.4		(3.1)		—		—		3.3
Other commercial and industrial	85.9		(30.7)		7.3		(3.2)		51.1
CRE - owner occupied	7.1		1.5		—		—		8.6
Hotel franchise finance	46.9		0.8		—		—		47.7
Other CRE - non-owner occupied	47.4		19.0		—		—		66.4
Residential	30.4		1.3		—		—		31.7
Residential - EBO	—		—		—		—		—
Construction and land development	27.4		4.1		—		—		31.5
Other	3.1		—		0.1		—		3.0
Total	$	309.7	$	1.0	$	9.2	$	(3.2)	$	304.7

Accrued interest receivable of $278 million and $281 million at March 31, 2024 and December 31, 2023, respectively, was excluded from the estimate of credit losses. Whereas, accrued interest receivable related to the Company's Residential-EBO loan portfolio segment was included in the estimate of credit losses and had an allowance of $3 million and $4 million as of March 31, 2024 and December 31, 2023, respectively. Accrued interest receivable, net of any allowance, is included in Other assets on the Consolidated Balance Sheet.

In addition to the ACL on funded loans HFI, the Company maintains a separate ACL related to off-balance sheet credit exposures, including unfunded loan commitments. This allowance is included in Other liabilities on the Consolidated Balance Sheet.

The below table reflects the activity in the ACL on unfunded loan commitments:

	Three Months Ended March 31,
	2024		2023
	(in millions)
Balance, beginning of period	$	31.6	$	47.0
Provision for (Recovery of) credit losses	1.5		(2.2)
Balance, end of period	$	33.1	$	44.8

The following tables disaggregate the Company's ACL on funded loans HFI and loan balances by measurement methodology:

	March 31, 2024
	Loans						Allowance
	Collectively Evaluated for Credit Loss		Individually Evaluated for Credit Loss		Total		Collectively Evaluated for Credit Loss		Individually Evaluated for Credit Loss		Total
	(in millions)
Warehouse lending	$	6,915	$	—	$	6,915	$	7.3	$	—	$	7.3
Municipal & nonprofit	1,617		5		1,622		13.2		0.7		13.9
Tech & innovation	2,832		109		2,941		40.8		7.2		48.0
Equity fund resources	695		—		695		1.2		—		1.2
Other commercial and industrial	7,591		163		7,754		62.5		4.6		67.1
CRE - owner occupied	1,664		43		1,707		6.2		—		6.2
Hotel franchise finance	3,481		75		3,556		35.4		0.4		35.8
Other CRE - non-owner occupied	6,161		204		6,365		104.7		—		104.7
Residential	13,078		—		13,078		22.1		—		22.1
Residential EBO	1,171		—		1,171		—		—		—
Construction and land development	4,676		70		4,746		31.9		—		31.9
Other	149		1		150		2.1		—		2.1
Total	$	50,030	$	670	$	50,700	$	327.4	$	12.9	$	340.3

	December 31, 2023
	Loans						Allowance
	Collectively Evaluated for Credit Loss		Individually Evaluated for Credit Loss		Total		Collectively Evaluated for Credit Loss		Individually Evaluated for Credit Loss		Total
	(in millions)
Warehouse lending	$	6,618	$	—	$	6,618	$	5.8	$	—	$	5.8
Municipal & nonprofit	1,548		6		1,554		13.7		1.0		14.7
Tech & innovation	2,729		79		2,808		38.3		3.8		42.1
Equity fund resources	845		—		845		1.3		—		1.3
Other commercial and industrial	7,362		90		7,452		64.6		16.8		81.4
CRE - owner occupied	1,613		45		1,658		6.0		—		6.0
Hotel franchise finance	3,708		147		3,855		33.4		—		33.4
Other CRE - non-owner occupied	5,838		136		5,974		96.0		—		96.0
Residential	13,287		—		13,287		23.1		—		23.1
Residential EBO	1,223		—		1,223		—		—		—
Construction and land development	4,791		71		4,862		30.4		—		30.4
Other	161		—		161		2.5		—		2.5
Total	$	49,723	$	574	$	50,297	$	315.1	$	21.6	$	336.7

Loan Purchases and Sales

During the three months ended March 31, 2024 and 2023, loan purchases totaled $389 million and $511 million, respectively, and consisted primarily of commercial and industrial and residential loans. There were no loans purchased with more-than-insignificant deterioration in credit quality during the three months ended March 31, 2024 and 2023.

During the three months ended March 31, 2024, the Company sold loans with a carrying value of approximately $148 million and recognized a charge-off of $1.4 million and a net loss of $4.9 million on these loan sales. During the three months ended March 31, 2023, the Company transferred $6.9 billion of loans HFI (primarily commercial and industrial loans) to HFS and sold $915 million of those loans. The Company recognized a net loss of $140.8 million on these loan transfers and sales during the three months ended March 31, 2023.

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Mortgage Servicing Rights

3 Months Ended

Mar. 31, 2024

Transfers and Servicing [Abstract]

Mortgage Servicing Rights

5. MORTGAGE SERVICING RIGHTS

The following table presents the changes in fair value of the Company's MSR portfolio related to its mortgage banking business and other information related to its servicing portfolio:

	Three Months Ended March 31,
	2024		2023
	(in millions)
Balance, beginning of period	$	1,124	$	1,148
Additions from loans sold with servicing rights retained	189		142
Carrying value of MSRs sold	(156)		(350)
Change in fair value	60		(8)
Mark to market adjustments	—		3
Realization of cash flows	(39)		(25)
Balance, end of period	$	1,178	$	910
Unpaid principal balance of mortgage loans serviced for others	$	65,620	$	58,466

Changes in the fair value of MSRs are recorded as Net loan servicing revenue in the Consolidated Income Statement. Due to the regulatory capital impact of MSRs on capital ratios, the Company sells certain MSRs and related servicing advances in the normal course of business. The Company may also sell excess servicing spread related to certain mortgage loans serviced by the Company. During the three months ended March 31, 2024, MSR sales had an aggregate net sales price of $156 million and the UPB of loans underlying these sales totaled $10.8 billion. During the three months ended March 31, 2023, MSR sales had an aggregate net sales price of $350 million and the UPB of loans underlying these sales totaled $19.5 billion. As of March 31, 2024 and December 31, 2023, the Company had a remaining receivable balance of $34 million and $41 million, respectively, related to holdbacks on MSR sales for servicing transfers, which are recorded in Other assets on the Consolidated Balance Sheet.

The Company receives loan servicing fees, net of subservicing costs, based on the UPB of the underlying loans. Loan servicing fees are collected from payments made by borrowers. The Company may receive other remuneration from rights to various borrower contracted fees, such as late charges, collateral reconveyance charges, and non-sufficient funds fees. Contractually specified servicing fees, late fees, and ancillary income associated with the Company's MSR portfolio totaled $67.0 million for the three months ended March 31, 2024 and $62.9 million for the three months ended March 31, 2023, which are recorded as Net loan servicing revenue in the Consolidated Income Statement.

In accordance with its contractual loan servicing obligations, the Company is required to advance funds to or on behalf of investors when borrowers do not make payments. The Company advances property taxes and insurance premiums for borrowers who have insufficient funds in escrow accounts, plus any other costs to preserve real estate properties. The Company may also advance funds to maintain, repair, and market foreclosed real estate properties. The Company is entitled to recover all or a portion of the advances from borrowers of reinstated and performing loans, from the proceeds of liquidated properties or from the government agency or GSE guarantor of charged-off loans. Servicing advances are charged-off when they are deemed to be uncollectible. As of March 31, 2024 and December 31, 2023, net servicing advances totaled $67 million and $87 million, respectively, which are recorded as Other assets on the Consolidated Balance Sheet.

The following table presents the effect of hypothetical changes in the fair value of MSRs caused by assumed immediate changes in interest rates, discount rates, and prepayment speeds that are used to determine fair value:

	March 31, 2024
	(in millions)
Fair value of mortgage servicing rights	$	1,178
Increase (decrease) in fair value resulting from:
Interest rate change of 50 basis points
Adverse change	(65)
Favorable change	57
Discount rate change of 50 basis points
Increase	(23)
Decrease	24
Conditional prepayment rate change of 1%
Increase	(33)
Decrease	36
Cost to service change of 10%
Increase	(14)
Decrease	14

Sensitivities are hypothetical changes in fair value and cannot be extrapolated because the relationship of changes in assumptions to changes in fair value may not be linear. In addition, the offsetting effect of hedging activities are not contemplated in these results and further, the effect of a variation in a particular assumption is calculated without changing any other assumptions, whereas a change in one factor may result in changes to another. Accordingly, no assurance can be given that actual results would be consistent with the results of these estimates. As a result, actual future changes in MSR values may differ significantly from those reported.

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Deposits

3 Months Ended

Mar. 31, 2024

Other Liabilities Disclosure [Abstract]

Deposits

6. DEPOSITS

The table below summarizes deposits by type:

	March 31, 2024		December 31, 2023
	(in millions)
Non-interest-bearing demand deposits	$	18,399	$	14,520
Interest-bearing transaction accounts	16,965		15,916
Savings and money market accounts	16,194		14,791
Time certificates of deposit ($250,000 or more)	1,683		1,478
Other time deposits (1)	8,987		8,628
Total deposits	$	62,228	$	55,333

(1)    Retail brokered time deposits over $250,000 of $5.7 billion and $5.8 billion as of March 31, 2024 and December 31, 2023, respectively, are included within Other time deposits as these deposits are generally participated out by brokers in shares below the FDIC insurance limit.

A summary of the contractual maturities for all time deposits as of March 31, 2024 is as follows: 

	(in millions)
2024	$	8,311
2025	2,328
2026	26
2027	3
2028	1
Thereafter	1
Total	$	10,670

Brokered deposits provide an additional source of deposits and are placed with the Bank through third-party brokers. At March 31, 2024 and December 31, 2023, the Company held wholesale brokered deposits of $6.5 billion and $6.6 billion, respectively, excluding reciprocal deposits. In addition, WAB is a participant in the IntraFi Network, a network that offers deposit placement services such as CDARS and ICS, and other reciprocal deposit networks which offer products that qualify large deposits for FDIC insurance. At March 31, 2024, the Company had $14.5 billion of reciprocal deposits, compared to $13.3 billion at December 31, 2023.

In addition, deposits for which the Company provides account holders with earnings credits or referral fees totaled $22.2 billion and $17.8 billion at March 31, 2024 and December 31, 2023, respectively. The Company incurred $131.2 million and $85.6 million in deposit related costs on these deposits during the three months ended March 31, 2024 and 2023, respectively. These costs are reported as Deposit costs in non-interest expense.

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Other Borrowings

3 Months Ended

Mar. 31, 2024

Debt Disclosure [Abstract]

Other Borrowings

7. OTHER BORROWINGS

The following table summarizes the Company’s other borrowings by type: 

	March 31, 2024		December 31, 2023
	(in millions)
Short-Term:
Federal funds purchased	$	—	$	175
FHLB advances	5,750		6,200
Repurchase agreements	8		382
Secured borrowings	22		27
Total short-term borrowings	$	5,780	$	6,784
Long-Term:
Credit linked notes, net	441		446
Total long-term borrowings	$	441	$	446
Total other borrowings	$	6,221	$	7,230

Short-Term Borrowings

Federal Funds Lines of Credit

The Company maintains overnight federal fund lines of credit totaling $839 million as of March 31, 2024, which have rates comparable to the federal funds effective rate plus 0.10% to 0.20%.

FHLB and FRB Advances

The Company also maintains secured overnight lines of credit with the FHLB and the FRB. The Company’s borrowing capacity is determined based on collateral pledged, generally consisting of investment securities and loans, at the time of the borrowing. As of March 31, 2024 and December 31, 2023, the Company had additional available credit with the FHLB of approximately $8.0 billion and $6.1 billion respectively. The weighted average rate on FHLB advances was 5.66% and 5.67% as of March 31, 2024 and December 31, 2023, respectively.

Repurchase Agreements

Warehouse borrowing lines of credit are used to finance the acquisition of loans through the use of repurchase agreements. Repurchase agreements operate as financings under which the Company transfers loans to secure these borrowings. The borrowing amounts are based on the attributes of the collateralized loans and are defined in the repurchase agreement of each warehouse lender. The Company retains beneficial ownership of the transferred loans and will receive the loans from the lender upon full repayment of the borrowing. The repurchase agreements may require the Company to transfer additional assets to the lender in the event the estimated fair value of the existing transferred loans declines.

As of March 31, 2024, the Company had access to approximately $2.3 billion in uncommitted warehouse funding, of which no amounts were drawn. As of December 31, 2023, there were $376 million in warehouse borrowings outstanding at a weighted average borrowing rate of 6.72%.

Other repurchase facilities include EBO loan and customer repurchase agreements. The total carrying value of these repurchase agreements was $8 million and $6 million as of March 31, 2024 and December 31, 2023, respectively.

Secured Borrowings

Secured borrowings consist of transfers of loans HFS not qualifying for sales accounting treatment. The weighted average interest rate on secured borrowings was 6.58% and 6.10% as of March 31, 2024 and December 31, 2023, respectively.

Long-Term Borrowings

Credit Linked Notes

The Company entered into credit linked note transactions that effectively transfer the risk of first losses on reference pools of the Company's loans purchased under its residential mortgage purchase program to the purchasers of the notes. The principal and interest payable on these notes may be reduced by a portion of the Company's loss on such loans if one of the following occurs with respect to a covered loan: (i) realized losses incurred by the Company on a loan following a liquidation of the loan or certain other events, or (ii) a modification of the loan resulting in a reduction in payments. The aggregate losses, if any, for each payment date will be allocated to reduce the class principal amount and (for modifications) the current interest of the notes in reverse order of class priority. Losses on residential mortgages have not generally been significant.

The Company's outstanding credit linked note issuances are detailed in the tables below:

March 31, 2024
Description	Issuance Date	Maturity Date	Interest Rate	Principal		Debt Issuance Costs
				(in millions)
Residential mortgage loans (1)	December 12, 2022	October 25, 2052	SOFR + 7.80%	$	89	$	2
Residential mortgage loans (2)	June 30, 2022	April 25, 2052	SOFR + 6.00%	177		3
Residential mortgage loans (3)	December 29, 2021	July 25, 2059	SOFR + 4.67%	189		2
Total				$	455	$	7

December 31, 2023
Description	Issuance Date	Maturity Date	Interest Rate	Principal		Debt Issuance Costs
				(in millions)
Residential mortgage loans (1)	December 12, 2022	October 25, 2052	SOFR + 7.80%	$	90	$	2
Residential mortgage loans (2)	June 30, 2022	April 25, 2052	SOFR + 6.00%	179		3
Residential mortgage loans (3)	December 29, 2021	July 25, 2059	SOFR + 4.67%	191		3
Total				$	460	$	8

(1)    There are multiple classes of these notes, each with an interest rate of SOFR plus a spread that ranges from 2.25% to 11.00% (or, a weighted average spread of 7.80%) on a reference pool balance of $1.8 billion as of March 31, 2024 and December 31, 2023.

(2)    There are multiple classes of these notes, each with an interest rate of SOFR plus a spread that ranges from 2.25% to 15.00% (or, a weighted average spread of 6.00%) on a reference pool balance of $3.5 billion and $3.6 billion as of March 31, 2024 and December 31, 2023, respectively.

(3)    There are six classes of these notes, each with an interest rate of SOFR plus a spread that ranges from 3.15% to 8.50% (or, a weighted average spread of 4.67%) on a reference pool balance of $3.7 billion and $3.8 billion as of March 31, 2024 and December 31, 2023, respectively.

During the three months ended March 31, 2023, the Company recognized a gain on extinguishment of debt of $12.7 million related to the payoff or paydown of credit linked notes on its warehouse and equity fund resource loans.

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Qualifying Debt

3 Months Ended

Mar. 31, 2024

Debt Disclosure [Abstract]

Qualifying Debt

8. QUALIFYING DEBT

Subordinated Debt

The Company's subordinated debt issuances are detailed in the tables below:

March 31, 2024
Description	Issuance Date	Maturity Date	Interest Rate		Principal		Debt Issuance Costs
					(in millions)
WAL fixed-to-variable-rate (1)	June 2021	June 15, 2031	3.00	%	$	600	$	6
WAB fixed-to-variable-rate (2)	May 2020	June 1, 2030	5.25	%	225		1
Total					$	825	$	7

December 31, 2023
Description	Issuance Date	Maturity Date	Interest Rate		Principal		Debt Issuance Costs
					(in millions)
WAL fixed-to-variable-rate (1)	June 2021	June 15, 2031	3.00	%	$	600	$	6
WAB fixed-to-variable-rate (2)	May 2020	June 1, 2030	5.25	%	225		1
Total					$	825	$	7

(1)    Notes are redeemable, in whole or in part, beginning on June 15, 2026 at their principal amount plus accrued and unpaid interest and has a fixed interest rate of 3.00%. The notes also convert to a variable rate of three-month SOFR plus 225 basis points on this date.

(2)    Debt is redeemable, in whole or in part, on or after June 1, 2025 at its principal amount plus accrued and unpaid interest and has a fixed interest rate of 5.25% through June 1, 2025 and then converts to a variable rate per annum equal to three-month SOFR plus 512 basis points.

The carrying value of all subordinated debt issuances totaled $818 million at March 31, 2024 and December 31, 2023.

Junior Subordinated Debt

The Company has formed or acquired through acquisition eight statutory business trusts, which exist for the exclusive purpose of issuing Cumulative Trust Preferred Securities.

With the exception of debt issued by Bridge Capital Trust I and Bridge Capital Trust II, junior subordinated debt is recorded at fair value at each reporting date due to the FVO election made by the Company under ASC 825. The Company did not make the FVO election for the junior subordinated debt acquired in the Bridge acquisition. Accordingly, the carrying value of these trusts does not reflect the current fair value of the debt and includes a fair market value adjustment established at acquisition that is being accreted over the remaining life of the trusts.

The carrying value of junior subordinated debt was $78 million and $77 million as of March 31, 2024 and December 31, 2023, respectively, with maturity dates ranging from 2033 through 2037. The weighted average interest rate of all junior subordinated debt as of March 31, 2024 and December 31, 2023 was 7.90% and 7.93%, respectively.

In the event of certain changes or amendments to regulatory requirements or federal tax rules, the debt is redeemable in whole. The obligations under these instruments are fully and unconditionally guaranteed by the Company and rank subordinate and junior in right of payment to all other liabilities of the Company. Based on guidance issued by the FRB, the Company's securities continue to qualify as Tier 1 Capital.

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Stockholders' Equity

3 Months Ended

Mar. 31, 2024

Stockholders' Equity Note [Abstract]

Stockholders' Equity

9. STOCKHOLDERS' EQUITY

Stock-Based Compensation

Restricted Stock Awards

Restricted stock awards granted to employees generally vest over a 3-year period and stock grants made to non-employee WAL directors have generally vested over six months, with the 2024 grants vesting over 1 year. The Company estimates the compensation cost for stock grants based upon the grant date fair value. Stock compensation expense is recognized on a straight-line basis over the requisite service period for the entire award. The aggregate grant date fair value for the restricted stock awards granted during the three months ended March 31, 2024 and 2023 was $44.8 million and $44.5 million, respectively. Stock compensation expense related to restricted stock awards granted to employees is included in Salaries and employee benefits in the Consolidated Income Statement. For restricted stock awards granted to WAL directors, the related stock compensation expense is included in Legal, professional, and directors' fees. For the three months ended March 31, 2024, the Company recognized $12.1 million, in stock-based compensation expense related to employee and WAL director stock grants, compared to $8.5 million for the three months ended March 31, 2023.

Performance Stock Units

The Company grants performance stock units to members of its executive management that do not vest unless the Company achieves a specified cumulative EPS target and a TSR performance measure over a three-year performance period. The number of shares issued will vary based on the cumulative EPS target and relative TSR performance factor that is achieved. The Company estimates the cost of performance stock units based upon the grant date fair value and expected vesting percentage over the three-year performance period. During the three months ended March 31, 2024, the Company recognized stock-based compensation expense of $1.0 million, compared to a $2.5 million net reversal for such units during the three months ended March 31, 2023 due to revised performance expectations.

The three-year performance period for the 2021 grant ended on December 31, 2023, and based on the Company's cumulative EPS and TSR performance measure for the performance period, these shares vested at 168% of the target award under the terms of the grant. As a result, 129,942 shares became fully vested and were distributed to executive management in the first quarter of 2024.

The three-year performance period for the 2020 grant ended on December 31, 2022, and based on the Company's cumulative EPS and TSR performance measure for the performance period, these shares vested at 180% of the target award under the terms of the grant. As a result, 157,784 shares became fully vested and distributed to executive management in the first quarter of 2023.

Cash Settled Restricted Stock Units

In 2024, the Company began granting cash settled restricted stock units to members of its executive management that vest equally on a monthly basis over a three-year period. As the awards are settled in cash and are not dependent on the occurrence of a future event, these awards are classified as liabilities on the Consolidated Balance Sheet. At each vesting date, the Company settles the vested stock units in cash at the settlement date stock price. During the three months ended March 31, 2024, the Company recognized compensation expense of $0.1 million related to these awards. There were no such awards outstanding during the three months ended March 31, 2023.

Preferred Stock

The Company has 12,000,000 depositary shares outstanding, each representing a 1/400th ownership interest in a share of the Company’s 4.250% Fixed-Rate Reset Non-Cumulative Perpetual Preferred Shares, Series A, par value $0.0001 per share, with a liquidation preference of $25 per depositary share (equivalent to $10,000 per share of Series A preferred stock). During the three months ended March 31, 2024 and 2023, the Company declared and paid a quarterly cash dividend of $0.27 per depositary share, for a total dividend payment to preferred stockholders of $3.2 million.

Common Stock Issuances

Pursuant to ATM Distribution Agreement

During the three months ended March 31, 2024 and 2023, the Company had no sales under the ATM program. Sales under the ATM program are made pursuant to a prospectus dated May 14, 2021 and prospectus supplements filed with the SEC in an offering of shares from the Company's shelf registration statement on Form S-3 (No. 333-256120). As of March 31, 2024, the remaining number of shares that can be sold under this agreement totaled 1,107,769.

Cash Dividend on Common Shares

During the three months ended March 31, 2024, the Company declared and paid a quarterly cash dividend of $0.37 per share, for a total dividend payment to stockholders of $40.7 million. During the three months ended March 31, 2023, the Company declared and paid a quarterly cash dividend of $0.36 per share for a total dividend payment to stockholders of $39.4 million.

Treasury Shares

Treasury share purchases represent shares surrendered to the Company equal in value to the statutory payroll tax withholding obligations arising from the vesting of employee restricted stock awards. During the three months ended March 31, 2024, the Company purchased treasury shares of 122,597 at a weighted average price of $61.55 per share. During the three months ended March 31, 2023, the Company purchased treasury shares of 143,404, at a weighted average price of $74.70 per share.

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Accumulated Other Comprehensive Income (Loss)

3 Months Ended

Mar. 31, 2024

Equity [Abstract]

Accumulated Other Comprehensive Income (Loss)

10. ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

The following table summarizes the changes in accumulated other comprehensive income (loss) by component, net of tax, for the periods indicated: 

	Three Months Ended March 31,
	Unrealized holding gains (losses) on AFS securities		Unrealized holding losses on SERP		Unrealized holding gains (losses) on junior subordinated debt		Impairment loss on securities		Total
	(in millions)
Balance, December 31, 2023	$	(516.6)	$	(0.3)	$	2.8	$	1.2	$	(512.9)
Other comprehensive loss before reclassifications	(44.9)		—		(0.5)		—		(45.4)
Amounts reclassified from AOCI	0.7		—		—		—		0.7
Net current-period other comprehensive loss	(44.2)		—		(0.5)		—		(44.7)
Balance, March 31, 2024	$	(560.8)	$	(0.3)	$	2.3	$	1.2	$	(557.6)
Balance, December 31, 2022	$	(663.7)	$	(0.3)	$	3.0	$	—	$	(661.0)
Other comprehensive income (loss) before reclassifications	60.1		—		(1.1)		—		59.0
Amounts reclassified from AOCI	9.3		—		—		1.2		10.5
Net current-period other comprehensive income (loss)	69.4		—		(1.1)		1.2		69.5
Balance, March 31, 2023	$	(594.3)	$	(0.3)	$	1.9	$	1.2	$	(591.5)

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Derivatives and Hedging Activities

3 Months Ended

Mar. 31, 2024

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivatives and Hedging Activities

11. DERIVATIVES AND HEDGING ACTIVITIES

The Company is a party to various derivative instruments. The primary types of derivatives the Company uses are interest rate contracts, forward purchase and sale commitments, and interest rate futures. Generally, these instruments are used to help manage the Company's exposure to interest rate risk related to IRLCs and its inventory of loans HFS and MSRs and also to meet client financing and hedging needs.

Derivatives are recorded at fair value on the Consolidated Balance Sheet, after taking into account the effects of bilateral collateral and master netting agreements. These agreements allow the Company to settle all derivative contracts held with the same counterparty on a net basis, and to offset net derivative positions with related cash collateral, where applicable.

Derivatives Designated in Hedge Relationships

The Company utilizes derivatives that have been designated as part of a hedge relationship in accordance with the applicable accounting guidance to minimize the exposure to changes in benchmark interest rates, which reduces asset sensitivity and volatility of net interest income and EVE to interest rate fluctuations, such that interest rate risk falls within Board approved limits. The primary derivative instruments used to manage interest rate risk are interest rate swaps, which convert the contractual interest rate index of agreed-upon amounts of assets and liabilities (i.e., notional amounts) from either a fixed rate to a variable rate, or from a variable rate to a fixed rate.

The Company has pay fixed/receive variable interest rate swaps designated as fair value hedges of certain fixed rate loans. As a result, the Company receives variable-rate interest payments in exchange for making fixed-rate payments over the lives of the contracts without exchanging the notional amounts. The variable-rate interest payments were based on LIBOR and were converted to SOFR plus a spread adjustment upon the discontinuation of LIBOR in June 2023.

The Company also has pay fixed/receive variable interest rate swaps, designated as fair value hedges using the portfolio layer method to manage the exposure to changes in fair value associated with pools of fixed rate loans, resulting from changes in the designated benchmark interest rate (federal funds rate). These portfolio layer hedges provide the Company the ability to execute a fair value hedge of the interest rate risk associated with a portfolio of similar prepayable assets, whereby the last dollar amount estimated to remain in the portfolio of assets was identified as the hedged item. Under these interest rate swap contracts, the Company received a variable rate and paid a fixed rate on the outstanding notional amount.

The Company also had pay fixed/receive variable interest rate swaps, designated as fair value hedges using the last-of-layer method. Upon termination of these last-of-layer hedges in 2022, the cumulative basis adjustment on these hedges was allocated across the remaining loan pool and is being amortized over the remaining term. At March 31, 2024, the remaining cumulative basis adjustment on the terminated last-of-layer hedges totaled $6 million.

Derivatives Not Designated in Hedge Relationships

Management enters into certain contracts and agreements, including foreign exchange derivative contracts, back-to-back interest rate contracts, risk participation agreements and equity warrants, which are not designated as accounting hedges. Foreign exchange derivative contracts include spot, forward, forward window, and swap contracts. The purpose of these derivative contracts is to mitigate foreign currency risk on transactions entered into, or on behalf of customers. The Company's back-to-back interest rate contracts are used to allow customers to manage long-term interest rate risk. Contracts with customers, along with the related derivative trades the Company places, are both remeasured at fair value, and are referred to as economic hedges since they economically offset the Company's exposure.

The Company also uses derivative financial instruments to manage exposure to interest rate risk within its mortgage banking business related to IRLCs and its inventory of loans HFS and MSRs. The Company economically hedges the changes in fair value associated with changes in interest rates generally by utilizing forward sale commitments, interest rate futures and interest rate swaps.

Risk participation agreements are entered into with lead banks in certain loan syndications to share in the risk of default on interest rate swaps on participated loans. Equity warrants represent the right to buy shares in a company at a specified price and are acquired by the Company primarily in connection with negotiating credit facilities and certain other services to private, venture-backed companies in the technology industry.

Fair Value Hedges

As of March 31, 2024 and December 31, 2023, the following amounts are reflected on the Consolidated Balance Sheet related to cumulative basis adjustments for outstanding fair value hedges:

	March 31, 2024				December 31, 2023
	Carrying Value of Hedged Assets/(Liabilities)		Cumulative Fair Value Hedging Adjustment (1)		Carrying Value of Hedged Assets/(Liabilities)		Cumulative Fair Value Hedging Adjustment (1)
	(in millions)
Loans HFI, net of deferred loan fees and costs (2)	$	3,857	$	66	$	3,875	$	(6)

(1)Included in the carrying value of the hedged assets/(liabilities).

(2)As of March 31, 2024, included portfolio layer method derivative instruments with $3.5 billion designated as the hedged amount (from a closed portfolio of prepayable fixed rate loans with a carrying value of $6.6 billion). The cumulative basis adjustment included in the carrying value of these hedged items totaled $(46) million.

For the Company's derivative instruments that are designated and qualify as fair value hedges, the gain or loss on the derivative instrument as well as the offsetting loss or gain on the hedged item attributable to the hedged risk are recognized in current period earnings. The loss or gain on the hedged item is recognized in the same line item as the offsetting loss or gain on the related interest rate swaps. For loans, the gain or loss on the hedged item is included in interest income, as shown in the table below.

	Three Months Ended March 31,
	2024				2023
Income Statement Classification	Gain/(Loss) on Swaps		Gain/(Loss) on Hedged Item		Gain/(Loss) on Swaps		Gain/(Loss) on Hedged Item
	(in millions)
Interest income	$	72.0	$	(72.5)	$	(4.3)	$	4.3

In addition to the gains and losses on the Company's outstanding fair value hedges presented in the above table, the Company recognized $3.0 million in interest income related to the amortization of the cumulative basis adjustment on its discontinued last-of-layer hedges during the three months ended March 31, 2024 and 2023.

Fair Values, Volume of Activity, and Gain/Loss Information Related to Derivative Instruments

The following table summarizes the fair value of the Company's derivative instruments on a gross basis as of March 31, 2024, December 31, 2023, and March 31, 2023. The change in the notional amounts of these derivatives from March 31, 2023 to March 31, 2024 indicates the volume of the Company's derivative transaction activity during these periods. The derivative asset and liability balances are presented on a gross basis, prior to the application of bilateral collateral and master netting agreements. Total derivative assets and liabilities are adjusted to take into account the impact of legally enforceable master netting agreements that allow the Company to settle all derivative contracts with the same counterparty on a net basis and to offset the net derivative position with the related cash collateral. Where master netting agreements are not in effect or are not enforceable under bankruptcy laws, the Company does not adjust those derivative amounts with counterparties.

	March 31, 2024						December 31, 2023						March 31, 2023
			Fair Value						Fair Value						Fair Value
	Notional Amount		Derivative Assets		Derivative Liabilities		Notional Amount		Derivative Assets		Derivative Liabilities		Notional Amount		Derivative Assets		Derivative Liabilities
	(in millions)
Derivatives designated as hedging instruments:
Fair value hedges
Interest rate contracts	$	3,884	$	67	$	—	$	3,895	$	19	$	24	$	470	$	14	$	1
Total	$	3,884	$	67	$	—	$	3,895	$	19	$	24	$	470	$	14	$	1
Derivatives not designated as hedging instruments:
Foreign currency contracts	$	165	$	1	$	1	$	135	$	1	$	1	$	189	$	2	$	1
Forward purchase contracts	5,590		13		2		5,544		26		—		7,814		34		5
Forward sales contracts	8,380		4		28		7,626		1		55		9,702		3		64
Futures purchase contracts (1), (2)	124		—		—		124		—		—		—		—		—
Futures sales contracts (1), (2)	9,996		—		—		10,906		—		—		9,710		—		—
Interest rate lock commitments	1,810		10		1		1,822		18		—		1,557		14		1
Interest rate contracts	3,890		20		21		3,628		19		20		1,983		5		6
Risk participation agreements	75		—		—		72		—		—		51		—		—
Equity warrants	57		18		—		55		4		—		50		3		—
Total	$	30,087	$	66	$	53	$	29,912	$	69	$	76	$	31,056	$	61	$	77
Margin			139		8				202		(9)				5		(14)
Total, including margin	$	30,087	$	205	$	61	$	29,912	$	271	$	67	$	31,056	$	66	$	63

(1)The Company enters into futures purchase and sales contracts that are subject to daily remargining and almost all of which are based on three-month SOFR to hedge against its MSR valuation exposure. The notional amount on these contracts is substantial as these contracts have a short duration and are intended to cover the longer duration of MSR hedges.

(2)The notional amounts previously reported for March 31, 2023 have been adjusted to account for the impact of offsetting contracts. To close a futures contract prior to settlement, the Company purchases an offsetting future with the same terms as the original contract and these contracts no longer require settlement.

The fair value of derivative contracts, after taking into account the effects of master netting agreements, is included in Other assets or Other liabilities on the Consolidated Balance Sheet, as summarized in the table below:

	March 31, 2024						December 31, 2023						March 31, 2023
	Gross amount of recognized assets (liabilities)		Gross offset		Net assets (liabilities)		Gross amount of recognized assets (liabilities)		Gross offset		Net assets (liabilities)		Gross amount of recognized assets (liabilities)		Gross offset		Net assets (liabilities)
	(in millions)
Derivatives subject to master netting arrangements:
Assets
Foreign currency contracts	$	1	$	—	$	1	$	—	$	—	$	—	$	—	$	—	$	—
Forward purchase contracts	13		—		13		26		—		26		30		—		30
Forward sales contracts	4		—		4		1		—		1		3		—		3
Interest rate contracts	84		—		84		31		—		31		14		—		14
Margin	139		—		139		202		—		202		5		—		5
Netting	—		(33)		(33)		—		(67)		(67)		—		(38)		(38)
	$	241	$	(33)	$	208	$	260	$	(67)	$	193	$	52	$	(38)	$	14
Liabilities
Foreign currency contracts	$	(1)	$	—	$	(1)	$	(1)	$	—	$	(1)	$	—	$	—	$	—
Forward purchase contracts	(2)		—		(2)		—		—		—		(4)		—		(4)
Forward sales contracts	(27)		—		(27)		(55)		—		(55)		(52)		—		(52)
Interest rate contracts	(2)		—		(2)		(31)		—		(31)		(1)		—		(1)
Margin	(8)		—		(8)		9		—		9		14		—		14
Netting	—		33		33		—		67		67		—		38		38
	$	(40)	$	33	$	(7)	$	(78)	$	67	$	(11)	$	(43)	$	38	$	(5)
Derivatives not subject to master netting arrangements:
Assets
Foreign currency contracts	$	—	$	—	$	—	$	1	$	—	$	1	$	2	$	—	$	2
Forward purchase contracts	—		—		—		—				—		4		—		4
Interest rate lock commitments	10		—		10		18		—		18		14		—		14
Interest rate contracts	3		—		3		7		—		7		5		—		5
Equity warrants	18		—		18		4		—		4		3		—		3
	$	31	$	—	$	31	$	30	$	—	$	30	$	28	$	—	$	28
Liabilities
Foreign currency contracts	$	—	$	—	$	—	$	—	$	—	$	—	$	(1)	$	—	$	(1)
Forward purchase contracts	—		—		—		—		—		—		(1)		—		(1)
Forward sales contracts	(1)		—		(1)		—		—		—		(12)		—		(12)
Interest rate lock commitments	(1)		—		(1)		—		—		—		(1)		—		(1)
Interest rate contracts	(19)		—		(19)		(13)		—		(13)		(6)		—		(6)
	$	(21)	$	—	$	(21)	$	(13)	$	—	$	(13)	$	(21)	$	—	$	(21)
Total derivatives and margin
Assets	$	272	$	(33)	$	239	$	290	$	(67)	$	223	$	80	$	(38)	$	42
Liabilities	$	(61)	$	33	$	(28)	$	(91)	$	67	$	(24)	$	(64)	$	38	$	(26)

The following table summarizes the net gain (loss) on derivatives included in income:

	Three Months Ended March 31,
	2024		2023
	(in millions)
Net gain (loss) on loan origination and sale activities:
Interest rate lock commitments	$	(8.1)	$	11.5
Forward contracts	16.7		(36.8)
Interest rate swaps	(2.2)		1.2
Other contracts	0.7		(0.5)
Total gain (loss)	$	7.1	$	(24.6)
Net loan servicing revenue:
Forward contracts	$	(16.3)	$	(1.6)
Futures contracts	10.7		(4.0)
Interest rate swaps	(36.3)		19.0
Total (loss) gain	$	(41.9)	$	13.4

Counterparty Credit Risk

Like other financial instruments, derivatives contain an element of credit risk. This risk is measured as the expected replacement value of the contracts. Management enters into bilateral collateral and master netting agreements that provide for the net settlement of all contracts with the same counterparty. Additionally, management monitors counterparty credit risk exposure on each contract to determine appropriate limits on the Company's total credit exposure across all product types, which may require the Company to post collateral to counterparties when these contracts are in a net liability position and conversely, for counterparties to post collateral to the Company when these contracts are in a net asset position. Management reviews the Company's collateral positions on a daily basis and exchanges collateral with counterparties in accordance with standard ISDA documentation and other related agreements. The Company generally posts or holds collateral in the form of cash deposits or highly rated securities issued by the U.S. Treasury or government-sponsored enterprises (FNMA and FHLMC), or guaranteed by GNMA. At March 31, 2024, December 31, 2023, and March 31, 2023 collateral pledged by the Company to counterparties for its derivatives totaled $146 million, $216 million, and $33 million, respectively.

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Earnings per Share

3 Months Ended

Mar. 31, 2024

Earnings Per Share [Abstract]

Earnings Per Share

12. EARNINGS PER SHARE

Diluted EPS is calculated using the weighted average outstanding common shares during the period, including common stock equivalents. Basic EPS is calculated using the weighted average outstanding common shares during the period.

The following table presents the calculation of basic and diluted EPS: 

	Three Months Ended March 31,
	2024		2023
	(in millions, except per share amounts)
Weighted average shares - basic	108.5		108.1
Dilutive effect of stock awards	0.5		0.2
Weighted average shares - diluted	109.0		108.3
Net income available to common stockholders	$	174.2	$	139.0
Earnings per Common Share:
Basic	$	1.61	$	1.29
Diluted	1.60		1.28

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Income Taxes

3 Months Ended

Mar. 31, 2024

Income Tax Disclosure [Abstract]

Income Taxes

13. INCOME TAXES

The Company's effective tax rate was 23.5% and 23.0% for the three months ended March 31, 2024 and 2023, respectively. The increase in the effective tax rate was primarily due to an increase in nondeductible insurance premiums and shortfalls from stock compensation expense in 2024.

As of March 31, 2024, the net DTA balance totaled $300 million, an increase of $13 million from $287 million at December 31, 2023. This overall increase in the net DTA was primarily the result of a decrease in the fair market value of AFS securities.

Although realization is not assured, the Company believes that the realization of the recognized deferred tax asset of $300 million at March 31, 2024 is more-likely-than-not based on expectations as to future taxable income and based on available tax planning strategies that could be implemented if necessary to prevent a carryover from expiring.

At March 31, 2024 and December 31, 2023, the Company had no deferred tax valuation allowance.

LIHTC and renewable energy projects

The Company holds ownership interests in limited partnerships and limited liability companies that invest in affordable housing and renewable energy projects. These investments are designed to generate a return primarily through the realization of federal tax credits and deductions.

Investments in LIHTC and renewable energy totaled $553 million and $573 million as of March 31, 2024 and December 31, 2023, respectively. Unfunded LIHTC and renewable energy obligations are included in Other liabilities on the Consolidated Balance Sheet and totaled $308 million and $322 million as of March 31, 2024 and December 31, 2023, respectively. For the three months ended March 31, 2024 and 2023, $18.6 million and $11.3 million, respectively, of amortization related to LIHTC investments was recognized as a component of income tax expense.

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Commitments and Contingencies

3 Months Ended

Mar. 31, 2024

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

14. COMMITMENTS AND CONTINGENCIES

Unfunded Commitments and Letters of Credit

The Company is party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include commitments to extend credit and letters of credit. They involve, to varying degrees, elements of credit risk in excess of amounts recognized on the Consolidated Balance Sheet.

Lines of credit are obligations to lend money to a borrower. Credit risk arises when the borrower's current financial condition may indicate less ability to pay than when the commitment was originally made. In the case of letters of credit, the risk arises from the potential failure of the customer to perform according to the terms of a contract. In such a situation, the third party might draw on the letter of credit to pay for completion of the contract and the Company would look to its customer to repay these funds with interest. To minimize the risk, the Company uses the same credit policies in making commitments and conditional obligations as it would for a loan to that customer.

Letters of credit and financial guarantees are commitments issued by the Company to guarantee the performance of a customer to a third party in borrowing arrangements. The Company generally has recourse to recover from the customer any amounts paid under the guarantees. Typically, letters of credit issued have expiration dates within one year.

A summary of the contractual amounts for unfunded commitments and letters of credit are as follows: 

	March 31, 2024		December 31, 2023
	(in millions)
Commitments to extend credit, including unsecured loan commitments of $937 at March 31, 2024 and $989 at December 31, 2023	$	13,106	$	13,291
Credit card commitments and financial guarantees	427		418
Letters of credit, including unsecured letters of credit of $6 at March 31, 2024 and $4 at December 31, 2023	238		222
Total	$	13,771	$	13,931

Commitments to extend credit are agreements to lend to a customer provided that there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. The Company enters into credit arrangements that generally provide for the termination of advances in the event of a covenant violation or other event of default. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Company evaluates each customer’s creditworthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary by the Company

upon extension of credit, is based on management’s credit evaluation of the party. The commitments are collateralized by the same types of assets used as loan collateral.

The Company has exposure to credit losses from unfunded commitments and letters of credit. As funds have not been disbursed on these commitments, they are not reported as loans outstanding. Credit losses related to these commitments are included in Other liabilities as a separate loss contingency and are not included in the ACL reported in "Note 4. Loans, Leases and Allowance for Credit Losses" of these Notes to Unaudited Consolidated Financial Statements. This loss contingency for unfunded loan commitments and letters of credit was $33 million and $32 million as of March 31, 2024 and December 31, 2023, respectively. Changes to this liability are adjusted through the provision for credit losses in the Consolidated Income Statement.

Commitments to Invest in Renewable Energy Projects

The Company has off-balance sheet commitments to invest in renewable energy projects, as described in "Note 13. Income Taxes" of these Notes to Unaudited Consolidated Financial Statements, subject to the underlying project meeting certain milestones. These conditional commitments totaled $38 million and $32 million as of March 31, 2024 and December 31, 2023, respectively.

Concentrations of Lending Activities

The Company does not have a single external customer from which it derives 10% or more of its revenues. The Company monitors concentrations of lending activities at the product and borrower relationship level. Commercial and industrial loans made up 39% and 38% of the Company's HFI loan portfolio as of March 31, 2024 and December 31, 2023, respectively. The Company's loan portfolio includes significant credit exposure to the CRE market. As of March 31, 2024 and December 31, 2023, CRE related loans accounted for approximately 32% and 33% of total loans, respectively. Approximately 16% of CRE loans, excluding construction and land loans, were owner-occupied as of March 31, 2024 and December 31, 2023. No borrower relationships at both the commitment and funded loan level exceeded 5% of total loans HFI as of March 31, 2024 and December 31, 2023.

Contingencies

The Company is involved in various lawsuits of a routine nature that are being handled and defended in the ordinary course of the Company’s business. Expenses are being incurred in connection with these lawsuits, but in the opinion of management, based in part on consultation with outside legal counsel, the resolution of these lawsuits and associated defense costs will not have a material impact on the Company’s financial position, results of operations, or cash flows.

Lease Commitments

The Company has operating leases under which it leases its branch offices, corporate headquarters, and other offices. Operating lease costs totaled $7.0 million during the three months ended March 31, 2024, compared to $7.4 million for the three months ended March 31, 2023. Other lease costs, which include common area maintenance, parking, and taxes, and were included as occupancy expense, totaled $1.5 million during the three months ended March 31, 2024, compared to $1.3 million for the three months ended March 31, 2023.

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Fair Value Accounting

3 Months Ended

Mar. 31, 2024

Fair Value Disclosures [Abstract]

Fair Value Accounting

15. FAIR VALUE ACCOUNTING

The fair value of an asset or liability is the price that would be received to sell the asset or paid to transfer the liability in an orderly transaction occurring in the principal market (or most advantageous market in the absence of a principal market) for such asset or liability. In estimating fair value, the Company utilizes valuation techniques that are consistent with the market approach, the income approach, and/or the cost approach. Such valuation techniques are consistently applied. Inputs to valuation techniques include the assumptions market participants would use in pricing an asset or liability. ASC 825 establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements).

In general, fair value is based upon quoted market prices, where available. If such quoted market prices are not available, fair value is based upon internally-developed models that primarily use, as inputs, observable market-based parameters. Valuation adjustments may be made to ensure financial instruments are recorded at fair value. These adjustments may include amounts to reflect counterparty credit quality and the Company’s creditworthiness, among other things, as well as unobservable parameters. Any such valuation adjustments are applied consistently over time. The Company’s valuation methodologies may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. While management believes the Company’s valuation methodologies are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different estimate of fair value at the reporting date. A more detailed description of the valuation methodologies used for assets and liabilities measured at fair value is set forth below.

Under ASC 825, the Company elected the FVO treatment for junior subordinated debt issued by WAL. This election is irrevocable and results in the recognition of unrealized gains and losses on the debt at each reporting date. These unrealized gains and losses are recognized in OCI rather than earnings. The Company did not elect FVO treatment for the junior subordinated debt assumed in the Bridge Capital Holdings acquisition.

The following table presents unrealized gains and losses from fair value changes on junior subordinated debt:

	Three Months Ended March 31,
	2024		2023
	(in millions)
Unrealized losses	$	(0.7)	$	(1.5)
Changes included in OCI, net of tax	(0.5)		(1.1)

Fair value on a recurring basis

Financial assets and financial liabilities measured at fair value on a recurring basis include the following:

AFS debt securities: Securities classified as AFS are reported at fair value utilizing Level 1 and Level 2 inputs. For these securities, the Company obtains fair value measurements from an independent pricing service. The fair value measurements consider observable data that may include quoted prices in active markets, dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information, and the bond’s terms and conditions, among other things.

Equity securities: Preferred stock and CRA investments are reported at fair value utilizing Level 1 inputs.

Independent pricing service: The Company's independent pricing service provides pricing information on the majority of the Company's Level 1 and Level 2 AFS debt securities. For a small subset of securities, other pricing sources are used, including observed prices on publicly-traded securities and dealer quotes. Management independently evaluates the fair value measurements received from the Company's third-party pricing service through multiple review steps. First, management reviews what has transpired in the marketplace with respect to interest rates, credit spreads, volatility, and mortgage rates, among other things, and develops an expectation of changes to the securities' valuations from the previous quarter. Then, management selects a sample of investment securities and compares the values provided by its primary third-party pricing service to the market values obtained from secondary sources, including other pricing services and safekeeping statements, and evaluates those with notable variances. In instances where there are discrepancies in pricing from various sources and management expectations, management may manually price securities using currently observed market data to determine whether they can develop similar prices or may utilize bid information from broker dealers. Any remaining discrepancies between management’s review and the prices provided by the vendor are discussed with the vendor and/or the Company’s other valuation advisors.

Loans HFS: Government-insured or guaranteed and agency-conforming 1-4 family residential loans HFS are salable into active markets. Accordingly, the fair value of these loans is based primarily on quoted market or contracted selling prices or a market price equivalent, which are categorized as Level 2 in the fair value hierarchy.

Mortgage servicing rights: MSRs are measured based on valuation techniques using Level 3 inputs. The Company uses a discounted cash flow model that incorporates assumptions market participants would use in estimating the fair value of servicing rights, including, but not limited to, option adjusted spread, conditional prepayment rate, servicing fee rate, recapture rate, and cost to service.

Derivative financial instruments: Forward purchase and sales contracts are measured based on valuation techniques using Level 2 inputs, such as quoted market prices, contracted selling prices, or a market price equivalent. Interest rate and foreign currency contracts are reported at fair value utilizing Level 2 inputs. The Company obtains dealer quotations to value its interest rate contracts. IRLCs are measured based on valuation techniques that consider loan type, underlying loan amount, maturity date, note rate, loan program, and expected settlement date, with Level 3 inputs for the servicing release premium and pull-through rate. These measurements are adjusted at the loan level to consider the servicing release premium and loan pricing adjustment specific to each loan. The base value is then adjusted for estimated pull-through rates. The pull-through rate and servicing fee multiple are unobservable inputs based on historical experience. Equity warrants are measured using a Black-Scholes option pricing model based on contractual strike price, expected term, the risk-free interest rate, and volatility, adjusted for a lack of marketability. The volatility input is considered Level 3 as the underlying equity is not publicly traded and is determined using comparable publicly traded companies.

Junior subordinated debt: The Company estimates the fair value of its junior subordinated debt using a discounted cash flow model which incorporates the effect of the Company’s own credit risk in the fair value of the liabilities (Level 3). The Company’s cash flow assumptions are based on contractual cash flows as the Company anticipates it will pay the debt according to its contractual terms.

The fair value of assets and liabilities measured at fair value on a recurring basis was determined using the following inputs: 

	Fair Value Measurements at the End of the Reporting Period Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value
March 31, 2024	(in millions)
Assets:
Available-for-sale debt securities
U.S. Treasury securities	$	7,011	$	—	$	—	$	7,011
Residential MBS issued by GSEs	—		4,536		—		4,536
Private label residential MBS	—		1,091		—		1,091
Tax-exempt	—		849		—		849
Commercial MBS issued by GSEs	—		586		—		586
Corporate debt securities	—		367		—		367
Other	28		41		—		69
Total AFS debt securities	$	7,039	$	7,470	$	—	$	14,509
Equity securities
Preferred stock	$	105	$	—	$	—	$	105
CRA investments	25		—		—		25
Total equity securities	$	130	$	—	$	—	$	130
Loans HFS (2)	$	—	$	1,809	$	3	$	1,812
MSRs	—		—		1,178		1,178
Derivative assets (1)	—		105		28		133
Liabilities:
Junior subordinated debt (3)	$	—	$	—	$	64	$	64
Derivative liabilities (1)	—		52		1		53

(1)See "Note 11. Derivatives and Hedging Activities." In addition, the carrying value of loans is decreased by $66 million as of March 31, 2024 for the effective portion of the hedge, which relates to the fair value of the hedges put in place to mitigate against fluctuations in interest rates. Derivative assets and liabilities exclude margin of $139 million and $8 million, respectively.

(2)Includes only the portion of loans HFS that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.

(3)Includes only the portion of junior subordinated debt that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.

	Fair Value Measurements at the End of the Reporting Period Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value
December 31, 2023	(in millions)
Assets:
Available-for-sale debt securities
U.S. Treasury securities	$	4,853	$	—	$	—	$	4,853
Residential MBS issued by GSEs	—		1,972		—		1,972
CLO	—		1,399		—		1,399
Private label residential MBS	—		1,117		—		1,117
Tax-exempt	—		858		—		858
Commercial MBS issued by GSEs	—		530		—		530
Corporate debt securities	—		367		—		367
Other	28		41		—		69
Total AFS debt securities	$	4,881	$	6,284	$	—	$	11,165
Equity securities
Preferred stock	$	100	$	—	$	—	$	100
CRA investments	26		—		—		26
Total equity securities	$	126	$	—	$	—	$	126
Loans - HFS (2)	$	—	$	1,377	$	3	$	1,380
Mortgage servicing rights	—		—		1,124		1,124
Derivative assets (1)	—		66		22		88
Liabilities:
Junior subordinated debt (3)	$	—	$	—	$	63	$	63
Derivative liabilities (1)	—		100		—		100

(1)See "Note 11. Derivatives and Hedging Activities." In addition, the carrying value of loans is increased by $6 million as of December 31, 2023 for the effective portion of the hedge, which relates to the fair value of the hedges put in place to mitigate against fluctuations in interest rates. Derivative assets and liabilities exclude margin of $202 million and $(9) million, respectively.

(2)Includes only the portion of loans HFS that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.

(3)Includes only the portion of junior subordinated debt that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.

The change in Level 3 liabilities measured at fair value on a recurring basis included in OCI was as follows:

	Junior Subordinated Debt
	Three Months Ended March 31,
	2024		2023
	(in millions)
Beginning balance	$	(62.8)	$	(62.5)
Change in fair value (1)	(0.7)		(1.5)
Ending balance	$	(63.5)	$	(64.0)

(1)Unrealized losses attributable to changes in the fair value of junior subordinated debt are recorded in OCI, net of tax, and totaled $(0.5) million and $(1.1) million for three months ended March 31, 2024 and 2023, respectively.

The significant unobservable inputs used in the fair value measurements of these Level 3 liabilities were as follows:

	March 31, 2024		Valuation Technique	Significant Unobservable Inputs	Input Value
	(in millions)
Junior subordinated debt	$	64	Discounted cash flow	Implied credit rating of the Company	8.73	%

	December 31, 2023		Valuation Technique	Significant Unobservable Inputs	Input Value
	(in millions)
Junior subordinated debt	$	63	Discounted cash flow	Implied credit rating of the Company	8.92	%

The significant unobservable inputs used in the fair value measurement of the Company’s junior subordinated debt as of March 31, 2024 and December 31, 2023 was the implied credit risk for the Company. As of March 31, 2024 and December 31, 2023,

the implied credit risk spread was calculated as the difference between the average of the 10 and 15-year 'BB' rated financial indexes over the corresponding swap indexes.

As of March 31, 2024, the Company estimates the discount rate at 8.73%, which represents an implied credit spread of 3.43% plus three-month SOFR (5.30%). As of December 31, 2023, the Company estimated the discount rate at 8.92%, which was a 3.59% credit spread plus three-month SOFR (5.33%).

The change in Level 3 assets and liabilities measured at fair value on a recurring basis included in income was as follows:

	Three Months Ended March 31, 2024
	MSRs		IRLCs (1)
	(in millions)
Balance, beginning of period	$	1,124	$	18
Purchases and additions	189		4,060
Sales and payments	(156)		—
Settlement of IRLCs upon acquisition or origination of loans HFS	—		(4,067)
Change in fair value	60		(1)
Realization of cash flows	(39)		—
Balance, end of period	$	1,178	$	10
Changes in unrealized gains for the period (2)	$	46	$	10

	Three Months Ended March 31, 2023
	MSRs		IRLCs (1)
	(in millions)
Balance, beginning of period	$	1,148	$	2
Purchases and additions	142		2,946
Sales and payments	(350)		—
Settlement of IRLCs upon acquisition or origination of loans HFS	—		(2,935)
Change in fair value	(8)		1
Mark to market adjustments	3		—
Realization of cash flows	(25)		—
Balance, end of period	$	910	$	14
Changes in unrealized gains for the period (2)	$	(3)	$	14

(1)     IRLC asset and liability positions are presented net.

(2)    Amounts recognized as part of non-interest income.

The significant unobservable inputs used in the fair value measurements of these Level 3 assets and liabilities were as follows:

		March 31, 2024
Asset/liability	Key inputs	Range	Weighted average
MSRs:	Option adjusted spread (in basis points)	(43) - 297	213
	Conditional prepayment rate (1)	9.1% - 22.0%	16.1		%
	Recapture rate	20.0% - 20.0%	20		%
	Servicing fee rate (in basis points)	25.0 - 56.5	38.4
	Cost to service	$75 - $95	$	86
IRLCs:	Servicing fee multiple	3.5 - 5.7	4.6
	Pull-through rate	68% - 100%	86		%

		December 31, 2023
Asset/liability	Key inputs	Range	Weighted average
MSRs:	Option adjusted spread (in basis points)	29 - 253	213
	Conditional prepayment rate (1)	9.5% - 23.9%	17.4		%
	Recapture rate	20.0% - 20.0%	20.0		%
	Servicing fee rate (in basis points)	25.0 - 56.5	35.6
	Cost to service	$93 - $100	$	95
IRLCs:	Servicing fee multiple	3.2 - 5.4	4.3
	Pull-through rate	68% - 100%	89		%

(1)    Lifetime total prepayment speed annualized.

The following is a summary of the difference between the aggregate fair value and the aggregate UPB of loans HFS for which the FVO has been elected:

	March 31, 2024						December 31, 2023
	Fair value		UPB		Difference		Fair value		UPB		Difference
	(in millions)
Loans HFS:
Current through 89 days delinquent	$	1,812	$	1,755	$	57	$	1,379	$	1,319	$	60
90 days or more delinquent	—		—		—		1		2		(1)
Total	$	1,812	$	1,755	$	57	$	1,380	$	1,321	$	59

Fair value on a nonrecurring basis

Certain assets are measured at fair value on a nonrecurring basis. That is, the assets are not measured at fair value on an ongoing basis, but are subject to fair value adjustments in certain circumstances (for example, when there is evidence of credit deterioration). The following table presents such assets carried on the Consolidated Balance Sheet by caption and by level within the ASC 825 hierarchy:

	Fair Value Measurements at the End of the Reporting Period Using
	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Active Markets for Similar Assets (Level 2)		Unobservable Inputs (Level 3)
	(in millions)
As of March 31, 2024:
Loans HFI	$	441	$	—	$	—	$	441
Other assets acquired through foreclosure	8		—		—		8
As of December 31, 2023:
Loans HFI	$	379	$	—	$	—	$	379
Other assets acquired through foreclosure	8		—		—		8

For Level 3 assets measured at fair value on a nonrecurring basis as of period end, the significant unobservable inputs used in the fair value measurements were as follows:

	March 31, 2024		Valuation Technique(s)		Significant Unobservable Inputs	Range
	(in millions)
Loans HFI	$	441	Collateral method	Third party appraisal	Costs to sell	6.0% to 10.0%
			Discounted cash flow method	Discount rate	Contractual loan rate	3.0% to 8.0%
				Scheduled cash collections	Probability of default	0% to 20.0%
				Proceeds from non-real estate collateral	Loss given default	0% to 70.0%
Other assets acquired through foreclosure	8		Collateral method	Third party appraisal	Costs to sell	4.0% to 10.0%

	December 31, 2023		Valuation Technique(s)		Significant Unobservable Inputs	Range
	(in millions)
Loans HFI	$	379	Collateral method	Third party appraisal	Costs to sell	6.0% to 10.0%
			Discounted cash flow method	Discount rate	Contractual loan rate	3.0% to 8.0%
				Scheduled cash collections	Probability of default	0% to 20.0%
				Proceeds from non-real estate collateral	Loss given default	0% to 70.0%
Other assets acquired through foreclosure	8		Collateral method	Third party appraisal	Costs to sell	4.0% to 10.0%

Loans HFI: Loans measured at fair value on a nonrecurring basis include collateral dependent loans. The specific reserves for these loans are based on collateral value, net of estimated disposition costs and other identified quantitative inputs. Collateral value is determined based on independent third-party appraisals or internally-developed discounted cash flow analyses. Appraisals may utilize a single valuation approach or a combination of approaches, including comparable sales and the income approach. Fair value is determined, where possible, using market prices derived from an appraisal or evaluation, which are considered to be Level 2. However, certain assumptions and unobservable inputs are often used by the appraiser, therefore qualifying the assets as Level 3 in the fair value hierarchy. In addition, when adjustments are made to an appraised value to reflect various factors such as the age of the appraisal or known changes in the market or the collateral, such valuation inputs are considered unobservable and the fair value measurement is categorized as a Level 3 measurement. Internal discounted cash flow analyses are also utilized to estimate the fair value of these loans, which considers internally-developed, unobservable inputs such as discount rates, default rates, and loss severity.

Total Level 3 collateral dependent loans had an estimated fair value of $441 million and $379 million at March 31, 2024 and December 31, 2023, respectively, net of a specific ACL of $3 million and $10 million at March 31, 2024 and December 31, 2023, respectively.

Other assets acquired through foreclosure: Other assets acquired through foreclosure consist of properties acquired as a result of, or in-lieu-of, foreclosure. These assets are initially reported at the fair value determined by independent appraisals using appraised value less estimated cost to sell. Such properties are generally re-appraised every 12 months. Costs relating to the development or improvement of the assets are capitalized and costs relating to holding the assets are charged to expense.

Fair value is determined, where possible, using market prices derived from an appraisal or evaluation, which are considered to be Level 2. However, certain assumptions and unobservable inputs are often used by the appraiser, therefore qualifying the assets as Level 3 in the fair value hierarchy. When significant adjustments are based on unobservable inputs, such as when a current appraised value is not available or management determines the fair value of the collateral is further impaired below the appraised value and there is no observable market price, the resulting fair value measurement has been categorized as a Level 3 measurement. The Company had $8 million of such assets at March 31, 2024 and December 31, 2023.

Fair Value of Financial Instruments

The estimated fair value of the Company’s financial instruments is as follows:

	March 31, 2024
	Carrying Amount		Fair Value
			Level 1		Level 2		Level 3		Total
	(in millions)
Financial assets:
Investment securities:
HTM	$	1,461	$	—	$	1,253	$	—	$	1,253
AFS	14,509		7,039		7,470		—		14,509
Equity	130		130		—		—		130
Derivative assets (1)	133		—		105		28		133
Loans HFS	1,841		—		1,818		23		1,841
Loans HFI, net	50,360		—		—		47,245		47,245
Mortgage servicing rights	1,178		—		—		1,178		1,178
Accrued interest receivable	360		—		360		—		360
Financial liabilities:
Deposits	$	62,228	$	—	$	62,263	$	—	$	62,263
Other borrowings	6,221		—		6,184		—		6,184
Qualifying debt	896		—		734		77		811
Derivative liabilities (1)	53		—		52		1		53
Accrued interest payable	168		—		168		—		168

(1)    Derivative assets and liabilities exclude margin of $139 million and $8 million, respectively.

	December 31, 2023
	Carrying Amount		Fair Value
			Level 1		Level 2		Level 3		Total
	(in millions)
Financial assets:
Investment securities:
HTM	$	1,429	$	—	$	1,251	$	—	$	1,251
AFS	11,165		4,881		6,284		—		11,165
Equity securities	126		126		—		—		126
Derivative assets (1)	84		—		66		18		84
Loans HFS	1,402		—		1,379		23		1,402
Loans HFI, net	49,960		—		—		46,877		46,877
Mortgage servicing rights	1,124		—		—		1,124		1,124
Accrued interest receivable	370		—		370		—		370
Financial liabilities:
Deposits	$	55,333	$	—	$	55,379	$	—	$	55,379
Other borrowings	7,230		—		7,192		—		7,192
Qualifying debt	895		—		734		76		810
Derivative liabilities (1)	100		—		100		—		100
Accrued interest payable	151		—		151		—		151

(1)    Derivative assets and liabilities exclude margin of $202 million and $(9) million, respectively.

Interest rate risk

The Company assumes interest rate risk (the risk to the Company’s earnings and capital from changes in interest rate levels) as a result of its normal operations. As a result, the fair values of the Company’s financial instruments, as well as its future net interest income, will change when interest rate levels change and that change may be either favorable or unfavorable to the Company.

Interest rate risk exposure is measured using interest rate sensitivity analysis to determine the Company's change in EVE and net interest income resulting from hypothetical changes in interest rates. If potential changes to EVE and net interest income resulting from hypothetical interest rate changes are not within the limits established by the BOD, the BOD may direct management to adjust the asset and liability mix to bring interest rate risk within BOD-approved limits.

WAB has an ALCO charged with managing interest rate risk within the BOD-approved limits. Limits are structured to preclude an interest rate risk profile which does not conform to both management and BOD risk tolerances without BOD and ALCO approval. Interest rate risk is also evaluated at the Parent level, which is reported to the BOD and its Finance and Investment Committee.

Fair value of commitments

The estimated fair value of letters of credit outstanding at March 31, 2024 and December 31, 2023 approximates zero as there have been no significant changes in borrower creditworthiness. Loan commitments on which the committed interest rates are less than the current market rate are insignificant at March 31, 2024 and December 31, 2023.

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Segments

3 Months Ended

Mar. 31, 2024

Segment Reporting [Abstract]

Segments

16. SEGMENTS

The Company's reportable segments are aggregated with a focus on products and services offered and consist of three reportable segments:

•Commercial: provides commercial banking and treasury management products and services to small and middle-market businesses, specialized banking services to sophisticated commercial institutions and investors within niche industries, as well as financial services to the real estate industry.

•Consumer Related: offers both commercial banking services to enterprises in consumer-related sectors and consumer banking services, such as residential mortgage banking.

•Corporate & Other: consists of the Company's investment portfolio, Corporate borrowings and other related items, income and expense items not allocated to other reportable segments, and inter-segment eliminations.

The Company's segment reporting process begins with the assignment of all loan and deposit accounts directly to the segments where these products are originated and/or serviced. Equity capital is assigned to each segment based on the risk profile of their assets and liabilities. With the exception of goodwill, which is assigned a 100% weighting, equity capital allocations ranged from 0% to 20% during the period. Any excess or deficient equity not allocated to segments based on risk is assigned to the Corporate & Other segment.

Net interest income, provision for credit losses, and non-interest expense amounts are recorded in their respective segments to the extent the amounts are directly attributable to those segments. Net interest income is recorded in each segment on a TEB with a corresponding increase in income tax expense, which is eliminated in the Corporate & Other segment.

Further, net interest income of a reportable segment includes a funds transfer pricing process that matches assets and liabilities with similar interest rate sensitivity and maturity characteristics. Using this funds transfer pricing methodology, liquidity is transferred between users and providers. A net user of funds has lending/investing in excess of deposits/borrowings and a net provider of funds has deposits/borrowings in excess of lending/investing. A segment that is a user of funds is charged for the use of funds, while a provider of funds is credited through funds transfer pricing, which is determined based on the average estimated life of the assets or liabilities in the portfolio. Residual funds transfer pricing mismatches are allocable to the Corporate & Other segment and presented in net interest income.

The net income amount for each reportable segment is further derived by the use of expense allocations. Certain expenses not directly attributable to a specific segment are allocated across all segments based on key metrics, such as number of employees, number of transactions processed for loans and deposits, and average loan and deposit balances. These types of expenses include information technology, operations, human resources, finance, risk management, credit administration, legal, and marketing.

Income taxes are applied to each segment based on estimated effective tax rates. Any difference in the corporate tax rate and the aggregate effective tax rates in the segments are adjusted in the Corporate & Other segment.

The following is a summary of operating segment information for the periods indicated:

Balance Sheet:	Consolidated Company		Commercial		Consumer Related		Corporate & Other
At March 31, 2024:	(in millions)
Assets:
Cash, cash equivalents, and investments	$	19,890	$	12	$	—	$	19,878
Loans HFS	1,841		—		1,841		—
Loans HFI, net of deferred fees and costs	50,700		29,642		21,058		—
Less: allowance for credit losses	(340)		(287)		(53)		—
Net loans HFI	50,360		29,355		21,005		—
Other assets acquired through foreclosure, net	8		8		—		—
Goodwill and other intangible assets, net	666		291		375		—
Other assets	4,224		414		1,961		1,849
Total assets	$	76,989	$	30,080	$	25,182	$	21,727
Liabilities:
Deposits	$	62,228	$	25,146	$	30,481	$	6,601
Borrowings and qualifying debt	7,117		9		21		7,087
Other liabilities	1,472		139		421		912
Total liabilities	70,817		25,294		30,923		14,600
Allocated equity:	6,172		2,590		1,814		1,768
Total liabilities and stockholders' equity	$	76,989	$	27,884	$	32,737	$	16,368
Excess funds provided (used)	—		(2,196)		7,555		(5,359)
Income Statement:
Three Months Ended March 31, 2024:	(in millions)
Net interest income	$	598.9	$	288.8	$	292.6	$	17.5
Provision for (recovery of) credit losses	15.2		15.3		(0.4)		0.3
Net interest income after provision for credit losses	583.7		273.5		293.0		17.2
Non-interest income	129.9		26.1		95.7		8.1
Non-interest expense	481.8		156.0		295.9		29.9
Income before income taxes	231.8		143.6		92.8		(4.6)
Income tax expense (benefit)	54.4		33.7		21.8		(1.1)
Net income (loss)	$	177.4	$	109.9	$	71.0	$	(3.5)

Balance Sheet:	Consolidated Company		Commercial		Consumer Related		Corporate
At December 31, 2023:	(in millions)
Assets:
Cash, cash equivalents, and investments	$	14,569	$	13	$	125	$	14,431
Loans held for sale	1,402		—		1,402		—
Loans, net of deferred fees and costs	50,297		29,136		21,161		—
Less: allowance for credit losses	(337)		(284)		(53)		—
Total loans	49,960		28,852		21,108		—
Other assets acquired through foreclosure, net	8		8		—		—
Goodwill and other intangible assets, net	669		292		377		—
Other assets	4,254		390		1,826		2,038
Total assets	$	70,862	$	29,555	$	24,838	$	16,469
Liabilities:
Deposits	$	55,333	$	23,897	$	24,925	$	6,511
Borrowings and qualifying debt	8,125		7		402		7,716
Other liabilities	1,326		109		338		879
Total liabilities	64,784		24,013		25,665		15,106
Allocated equity:	6,078		2,555		1,790		1,733
Total liabilities and stockholders' equity	$	70,862	$	26,568	$	27,455	$	16,839
Excess funds provided (used)	—		(2,987)		2,617		370
Income Statements:
Three Months Ended March 31, 2023:	(in millions)
Net interest income	$	609.9	$	389.4	$	199.3	$	21.2
Provision for (recovery of) credit losses	19.4		(2.7)		1.5		20.6
Net interest income after provision for credit losses	590.5		392.1		197.8		0.6
Non-interest income	(58.0)		(96.7)		51.0		(12.3)
Non-interest expense	347.9		136.0		192.0		19.9
Income (loss) before income taxes	184.6		159.4		56.8		(31.6)
Income tax expense (benefit)	42.4		38.5		12.8		(8.9)
Net income (loss)	$	142.2	$	120.9	$	44.0	$	(22.7)

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Revenue from Contracts with Customers

3 Months Ended

Mar. 31, 2024

Revenue from Contract with Customer [Abstract]

Revenue from Contracts with Customers

17. REVENUE FROM CONTRACTS WITH CUSTOMERS

Revenue streams within the scope of ASC 606 include service charges and fees, interchange fees on credit and debit cards, success fees, and legal settlement service fees. These revenues totaled $13.5 million and $14.0 million for the three months ended March 31, 2024 and 2023, respectively. The Company had no material unsatisfied performance obligations as of March 31, 2024 or December 31, 2023.

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Pay vs Performance Disclosure - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Pay vs Performance Disclosure
Net income	$ 177.4	$ 142.2

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Insider Trading Arrangements	3 Months Ended
	Mar. 31, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

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Summary of Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2024

Accounting Policies [Abstract]

Nature of operations

Nature of operations

WAL is a bank holding company headquartered in Phoenix, Arizona, incorporated under the laws of the state of Delaware. WAL provides a full spectrum of customized loan, deposit, and treasury management capabilities, including 24/7 funds transfer and other digital payment offerings through its wholly-owned banking subsidiary, WAB.

WAB operates the following full-service banking divisions: ABA, BON, FIB, Bridge, and TPB. The Company also serves business customers through a national platform of specialized financial services, including mortgage banking services through AmeriHome, and digital payment services for the class action legal industry. In addition, the Company has the following non-bank subsidiaries: CSI, a captive insurance company formed and licensed under the laws of the State of Arizona and established as part of the Company's overall enterprise risk management strategy, and WATC, which provides corporate trust services and levered loan administration solutions.

Basis of presentation

Basis of presentation

The accompanying Unaudited Consolidated Financial Statements as of March 31, 2024 and for the three months ended March 31, 2024 and 2023 have been prepared in accordance with GAAP for interim financial information and Article 10 of Regulation S-X and, therefore, do not include all of the information and footnotes required by GAAP for complete financial statements. Accordingly, these statements should be read in conjunction with the Company's audited Consolidated Financial Statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2023. The accounts of the Company and its consolidated subsidiaries are included in the Consolidated Financial Statements.

The information furnished in these interim statements reflects all adjustments that are, in the opinion of management, necessary for a fair statement of the results for each respective period presented. Such adjustments are of a normal, recurring nature. The results of operations in the interim statements are not necessarily indicative of the results that may be expected for any other quarter or for the full year.

Recent accounting pronouncements and Recently adopted accounting guidance

Recent accounting pronouncements

Improvements to Income Tax Disclosures

In December 2023, the FASB issued guidance within ASU 2023-09, Income Taxes (Topic 740). The amendments in this update are intended to increase visibility into various income tax components that affect the reconciliation of the effective tax rate to the statutory rate, as well as the qualitative and quantitative aspects of those components. Public business entities will be required to disclose on an annual basis, specific categories in the rate reconciliation and provide additional information for reconciling items that meet or exceed a five percent threshold (computed by multiplying pretax income by the applicable statutory income tax rate) and include disclosure of state and local jurisdictions that make up the majority of the state and local income tax category in the rate reconciliation. Additional disclosure items include disaggregation of income taxes paid to and income tax expense from federal, state, and foreign jurisdictions as well as disaggregation of income taxes paid to individual jurisdictions in which income taxes paid are equal to or greater than five percent of total income taxes paid.

The amendments in this update are effective for fiscal years beginning after December 15, 2024 and interim periods within fiscal years beginning after December 15, 2025 and may be applied on a prospective or retrospective basis. The Company is currently evaluating the impact these amendments will have on its Consolidated Financial Statements.

Accounting for and Disclosure of Crypto Assets

In December 2023, the FASB issued guidance within ASU 2023-08, Intangibles — Goodwill and Other — Crypto Assets (Topic 350). The amendments in this update require entities that hold certain crypto assets to measure such assets at fair value and recognize any changes in fair value in net income in each reporting period. Entities will also be required to present crypto assets measured at fair value separately from other intangible assets on the balance sheet and changes from the remeasurement of crypto assets separately from changes in the carrying amounts of other intangible assets in the income statement. Other disclosure items include the name, cost basis, fair value, and number of units for each significant crypto asset holding and the aggregate fair values and cost bases of crypto asset holdings that are not individually significant along with a rollforward of activity in the reporting period and disclosure of the method for determining the cost basis of the crypto assets.

The amendments in this update are effective for fiscal years beginning after December 15, 2024, including interim periods within those fiscal years and are applied through a cumulative-effect adjustment to the opening balance of retained earnings (as of the beginning of the annual reporting period of adoption). As the Company does not currently hold any crypto assets meeting the criteria outlined in the update, the adoption of this guidance is not expected to have an impact on the Company's Consolidated Financial Statements.

Improvements to Reportable Segment Disclosures

In November 2023, the FASB issued guidance within ASU 2023-07, Segment Reporting (Topic 280). The amendments in this update are intended to improve reportable segment disclosure requirements, primarily through enhanced disclosures related to significant segment expenses. The amendments do not change how an entity identifies its operating segments, aggregates those operating segments, or applies the quantitative thresholds to determine its reportable segments and all existing segment disclosure requirements in ASC 280 and other Codification topics remain unchanged. The amendments in this update are incremental and require public entities that report segment information to disclose, on an annual and interim basis, significant segment expenses that are regularly provided to the chief operating decision maker and included within each reported measure of segment profit or loss as well as other segment items. Annual disclosure of the title and position of the chief operating decision maker and how the reported measures of segment profit or loss are used to assess performance and allocation of resources is also required.

The amendments in this update are effective for fiscal years beginning after December 15, 2023 and interim periods within fiscal years beginning after December 15, 2024 and are applied on a retrospective basis. The Company is currently evaluating the impact these amendments will have on its Consolidated Financial Statements.

Recently adopted accounting guidance

Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method

In March 2023, the FASB issued guidance within ASU 2023-02, Investments — Equity Method and Joint Ventures (Topic 323). The amendments in this update permit entities to elect to account for tax equity investments, regardless of the tax credit program from which the income tax credits are received, using the proportional amortization method if certain conditions are met. Previously this option was only permitted for LIHTC investments. Additionally, the amendments in this update require that all tax equity investments accounted for using the proportional amortization method apply the delayed equity contribution guidance in Subtopic 323-740 and disclosure of the nature of an entity's tax equity investments and their effect on an entity's financial position and results of operations.

The Company adopted this accounting guidance prospectively on January 1, 2024. The adoption of this guidance did not have a material impact on the Company's Consolidated Financial Statements.

Use of estimates

Use of estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Management's estimates and judgments are ongoing and are based on experience, current and expected future conditions, third-party evaluations and various other assumptions that management believes are reasonable under the circumstances. The results of these estimates form the basis for making judgments about the carrying values of assets and liabilities, as well as identifying and assessing the accounting treatment with respect to commitments and contingencies. Actual results may differ from those estimates and assumptions used in the Consolidated Financial Statements and related notes. Material estimates that are susceptible to significant changes in the near term relate to: 1) the determination of the ACL; 2) certain assets and liabilities carried at or evaluated using fair value measurements; 3) goodwill impairment; and 4) accounting for income taxes.

Principles of consolidation

Principles of consolidation

As of March 31, 2024, WAL has the following significant wholly-owned subsidiaries: WAB and eight unconsolidated subsidiaries used as business trusts in connection with the issuance of trust-preferred securities.

WAB has the following significant wholly-owned subsidiaries: 1) WABT, which holds certain investment securities, municipal and nonprofit loans, and leases; 2) WA PWI, which holds interests in certain limited partnerships invested primarily in low income housing tax credits and small business investment corporations; 3) Helios Prime, which holds interests in certain limited partnerships invested in renewable energy projects; 4) BW Real Estate, Inc., which operates as a real estate investment trust and holds certain of WAB's real estate loans and related securities; and 5) Western Finance Company, which purchases and originates equipment finance leases and provides mortgage banking services through its wholly-owned subsidiary, AmeriHome.

The Company does not have any other significant entities that should be consolidated. All significant intercompany balances and transactions have been eliminated in consolidation.

Reclassifications

Reclassifications

Certain amounts in the Consolidated Income Statements for the prior periods have been reclassified to conform to the current presentation. The reclassifications had no effect on net income or stockholders’ equity as previously reported.

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Investment Securities (Tables)

3 Months Ended

Mar. 31, 2024

Investments, Debt and Equity Securities [Abstract]

Carrying Amounts and Fair Values of Investment Securities

The carrying amounts and fair values of investment securities are summarized as follows:

	March 31, 2024
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)		Fair Value
	(in millions)
Held-to-maturity
Tax-exempt	$	1,278	$	—	$	(169)	$	1,109
Private label residential MBS	183		—		(39)		144
Total HTM securities	$	1,461	$	—	$	(208)	$	1,253
Available-for-sale debt securities
U.S. Treasury securities	$	7,019	$	—	$	(8)	$	7,011
Residential MBS issued by GSEs	4,928		3		(395)		4,536
Private label residential MBS	1,301		1		(211)		1,091
Tax-exempt	927		—		(78)		849
Commercial MBS issued by GSEs	591		5		(10)		586
Corporate debt securities	411		—		(44)		367
Other	74		3		(8)		69
Total AFS debt securities	$	15,251	$	12	$	(754)	$	14,509

	December 31, 2023
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)		Fair Value
	(in millions)
Held-to-maturity
Tax-exempt	$	1,243	$	1	$	(140)	$	1,104
Private label residential MBS	186		—		(39)		147
Total HTM securities	$	1,429	$	1	$	(179)	$	1,251
Available-for-sale debt securities
U.S. Treasury securities	$	4,853	$	1	$	(1)	$	4,853
Residential MBS issued by GSEs	2,328		3		(359)		1,972
CLO	1,407		1		(9)		1,399
Private label residential MBS	1,320		1		(204)		1,117
Tax-exempt	925		—		(67)		858
Commercial MBS issued by GSEs	531		8		(9)		530
Corporate debt securities	411		—		(44)		367
Other	74		4		(9)		69
Total AFS debt securities	$	11,849	$	18	$	(702)	$	11,165

Unrealized Losses and Fair Value of Investment Securities in Continuous Unrealized Loss Position

The following tables summarize the Company's AFS debt securities in an unrealized loss position, aggregated by major security type and length of time in a continuous unrealized loss position: 

	March 31, 2024
	Less Than Twelve Months				More Than Twelve Months				Total
	Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value
	(in millions)
Available-for-sale debt securities
U.S. Treasury securities	$	8	$	6,338	$	—	$	—	$	8	$	6,338
Residential MBS issued by GSEs	5		1,125		390		1,570		395		2,695
Private label residential MBS	—		—		211		997		211		997
Tax-exempt	1		33		77		815		78		848
Commercial MBS issued by GSEs	1		137		9		52		10		189
Corporate debt securities (1)	—		—		44		360		44		360
Other	—		—		8		55		8		55
Total AFS securities	$	15	$	7,633	$	739	$	3,849	$	754	$	11,482

(1)Includes securities with an ACL that have a fair value of $22 million and unrealized losses of $6 million.

	December 31, 2023
	Less Than Twelve Months				More Than Twelve Months				Total
	Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value
	(in millions)
Available-for-sale debt securities
U.S. Treasury securities	$	1	$	2,208	$	—	$	—	$	1	$	2,208
Residential MBS issued by GSEs	3		174		356		1,551		359		1,725
Private label residential MBS	—		—		204		1,020		204		1,020
CLO	—		—		9		845		9		845
Tax-exempt	3		67		64		773		67		840
Corporate debt securities (1)	—		—		44		359		44		359
Commercial MBS issued by GSEs	—		—		9		53		9		53
Other	—		—		9		54		9		54
Total AFS securities	$	7	$	2,449	$	695	$	4,655	$	702	$	7,104

(1)Includes securities with an ACL that have a fair value of $54 million and unrealized losses of $8 million.

Rollforward by Major Security Type of the ACL on AFS Debt Securities

The following table presents a rollforward by major security type of the ACL on the Company's AFS debt securities:

	Three Months Ended March 31, 2024
	Balance, December 31, 2023		Recovery of Credit Losses		Charge-offs		Recoveries		Balance, March 31, 2024
	(in millions)
Available for sale securities
Corporate debt securities	$	1.4	$	(0.1)	$	—	$	—	$	1.3

	Three Months Ended March 31, 2023
	Balance, December 31, 2022		Provision for Credit Losses		Charge-offs		Recoveries		Balance March 31, 2023
	(in millions)
Available for sale securities
Corporate debt securities	$	—	$	19.3	$	(17.1)	$	—	$	2.2

Rollforward by Major Security Type of the ACL on HTM Debt Securities

The following table presents a rollforward by major security type of the ACL on the Company's HTM debt securities:

	Three Months Ended March 31, 2024
	Balance, December 31, 2023		Provision for Credit Losses		Charge-offs		Recoveries		Balance, March 31, 2024
	(in millions)
Held-to-maturity debt securities
Tax-exempt	$	7.8	$	0.4	$	—	$	—	$	8.2

	Three Months Ended March 31, 2023
	Balance, December 31, 2022		Provision for Credit Losses		Charge-offs		Recoveries		Balance March 31, 2023
	(in millions)
Held-to-maturity debt securities
Tax-exempt	$	5.2	$	1.3	$	—	$	—	$	6.5

Investment Securities by Credit Rating Type

The following tables summarize the carrying amount of the Company’s investment ratings position, which are updated quarterly and used to monitor the credit quality of the Company's securities: 

	March 31, 2024
	AAA		Split-rated AAA/AA+		AA+ to AA-		A+ to A-		BBB+ to BBB-		BB+ and below		Unrated		Totals
	(in millions)
Held-to-maturity
Tax-exempt	$	—	$	—	$	—	$	—	$	—	$	—	$	1,278	$	1,278
Private label residential MBS	—		—		—		—		—		—		183		183
Total HTM securities (1)	$	—	$	—	$	—	$	—	$	—	$	—	$	1,461	$	1,461
Available-for-sale debt securities
U.S. Treasury securities	$	—	$	7,011	$	—	$	—	$	—	$	—	$	—	$	7,011
Residential MBS issued by GSEs	—		4,536		—		—		—		—		—		4,536
Private label residential MBS	1,064		—		26		—		—		1		—		1,091
Tax-exempt	9		15		356		380		—		—		89		849
Commercial MBS issued by GSEs	—		586		—		—		—		—		—		586
Corporate debt securities	—		—		—		76		242		49		—		367
Other	—		—		9		11		29		3		17		69
Total AFS securities (1)	$	1,073	$	12,148	$	391	$	467	$	271	$	53	$	106	$	14,509
Equity securities
Preferred stock	$	—	$	—	$	—	$	—	$	55	$	38	$	12	$	105
CRA investments	—		25		—		—		—		—		—		25
Total equity securities (1)	$	—	$	25	$	—	$	—	$	55	$	38	$	12	$	130

(1)For rated securities, if ratings differ, the Company uses an average of the available ratings by major credit agencies.

	December 31, 2023
	AAA		Split-rated AAA/AA+		AA+ to AA-		A+ to A-		BBB+ to BBB-		BB+ and below		Unrated		Totals
	(in millions)
Held-to-maturity
Tax-exempt	$	—	$	—	$	—	$	—	$	—	$	—	$	1,243	$	1,243
Private label residential MBS	—		—		—		—		—		—		186		186
Total HTM securities (1)	$	—	$	—	$	—	$	—	$	—	$	—	$	1,429	$	1,429
Available-for-sale debt securities
U.S. Treasury securities	$	—	$	4,853	$	—	$	—	$	—	$	—	$	—	$	4,853
Residential MBS issued by GSEs	—		1,972		—		—		—		—		—		1,972
CLO	79		—		1,265		55		—		—		—		1,399
Private label residential MBS	1,090		—		26		—		—		1		—		1,117
Tax-exempt	9		16		361		386		—		—		86		858
Commercial MBS issued by GSEs	—		530		—		—		—		—		—		530
Corporate debt securities	—		—		—		76		211		80		—		367
Other	—		—		9		11		28		4		17		69
Total AFS securities (1)	$	1,178	$	7,371	$	1,661	$	528	$	239	$	85	$	103	$	11,165
Equity securities
Preferred stock	$	—	$	—	$	—	$	—	$	54	$	35	$	11	$	100
CRA investments	—		26		—		—		—		—		—		26
Total equity securities (1)	$	—	$	26	$	—	$	—	$	54	$	35	$	11	$	126

(1)For rated securities, if ratings differ, the Company uses an average of the available ratings by major credit agencies.

Amortized Cost and Fair Value of Investment Securities by Contractual Maturities

The amortized cost and fair value of the Company's debt securities as of March 31, 2024, by contractual maturities are shown below. MBS are shown separately as individual MBS are comprised of pools of loans with varying maturities. Therefore, these securities are listed separately in the maturity summary.

	March 31, 2024
	Amortized Cost		Estimated Fair Value
	(in millions)
Held-to-maturity
Due in one year or less	$	29	$	29
After one year through five years	8		8
After five years through ten years	86		74
After ten years	1,155		998
Mortgage-backed securities	183		144
Total HTM securities	$	1,461	$	1,253
Available-for-sale
Due in one year or less	$	6,540	$	6,535
After one year through five years	646		634
After five years through ten years	278		242
After ten years	967		885
Mortgage-backed securities	6,820		6,213
Total AFS securities	$	15,251	$	14,509

Gains and Losses on Sales of Investment Securities

The following table presents gross gains and losses on sales of investment securities:

	Three Months Ended March 31,
	2024		2023
	(in millions)
Available-for-sale securities
Gross gains	$	0.9	$	3.4
Gross losses	(1.8)		(15.9)
Net losses on AFS securities	$	(0.9)	$	(12.5)

XML

Loans Held For Sale (Tables)

3 Months Ended

Mar. 31, 2024

Receivables [Abstract]

Summary of Loans HFS by Type

The following is a summary of loans HFS by type:

	March 31, 2024		December 31, 2023
	(in millions)
Government-insured or guaranteed:
EBO (1)	$	—	$	2
Non-EBO	764		498
Total government-insured or guaranteed	764		500
Agency-conforming	1,067		899
Non-agency	10		3
Total loans HFS	$	1,841	$	1,402

(1)    EBO loans are delinquent FHA, VA, or USDA loans purchased from GNMA pools under the terms of the GNMA MBS program that can be repooled when loans are brought current either through the borrower's reperformance or through completion of a loan modification.

The following is a summary of the net gain on loan purchase, origination, and sale activities on residential mortgage loans to be sold or securitized:

	Three Months Ended March 31,
	2024		2023
	(in millions)
Mortgage servicing rights capitalized upon sale of loans	$	188.7	$	142.4
Net proceeds from sale of loans (1)	(160.7)		(107.4)
Provision for and change in estimate of liability for losses under representations and warranties, net	3.2		2.4
Change in fair value	(6.7)		6.6
Change in fair value of derivatives:
Unrealized gain (loss) on derivatives	15.3		(22.2)
Realized gain on derivatives	(8.1)		(2.4)
Total change in fair value of derivatives	7.2		(24.6)
Net gain on residential mortgage loans HFS	$	31.7	$	19.4
Loan acquisition and origination fees	13.6		12.0
Net gain on loan origination and sale activities	$	45.3	$	31.4

(1)     Represents the difference between cash proceeds received upon settlement and loan basis

Summary of Net Gain on Loan Purchase, Origination and Sale Activities on Residential Mortgage Loans

The following is a summary of loans HFS by type:

	March 31, 2024		December 31, 2023
	(in millions)
Government-insured or guaranteed:
EBO (1)	$	—	$	2
Non-EBO	764		498
Total government-insured or guaranteed	764		500
Agency-conforming	1,067		899
Non-agency	10		3
Total loans HFS	$	1,841	$	1,402

(1)    EBO loans are delinquent FHA, VA, or USDA loans purchased from GNMA pools under the terms of the GNMA MBS program that can be repooled when loans are brought current either through the borrower's reperformance or through completion of a loan modification.

The following is a summary of the net gain on loan purchase, origination, and sale activities on residential mortgage loans to be sold or securitized:

	Three Months Ended March 31,
	2024		2023
	(in millions)
Mortgage servicing rights capitalized upon sale of loans	$	188.7	$	142.4
Net proceeds from sale of loans (1)	(160.7)		(107.4)
Provision for and change in estimate of liability for losses under representations and warranties, net	3.2		2.4
Change in fair value	(6.7)		6.6
Change in fair value of derivatives:
Unrealized gain (loss) on derivatives	15.3		(22.2)
Realized gain on derivatives	(8.1)		(2.4)
Total change in fair value of derivatives	7.2		(24.6)
Net gain on residential mortgage loans HFS	$	31.7	$	19.4
Loan acquisition and origination fees	13.6		12.0
Net gain on loan origination and sale activities	$	45.3	$	31.4

(1)     Represents the difference between cash proceeds received upon settlement and loan basis

XML

Loans, Leases and Allowance for Credit Losses (Tables)

3 Months Ended

Mar. 31, 2024

Receivables [Abstract]

Schedule of Held for Investment Loan Portfolio Composition of Loans, Leases and Allowance for Credit Losses

The composition of the Company's HFI loan portfolio is as follows:

	March 31, 2024		December 31, 2023
	(in millions)
Warehouse lending	$	6,915	$	6,618
Municipal & nonprofit	1,622		1,554
Tech & innovation	2,941		2,808
Equity fund resources	695		845
Other commercial and industrial	7,754		7,452
CRE - owner occupied	1,707		1,658
Hotel franchise finance	3,556		3,855
Other CRE - non-owner occupied	6,365		5,974
Residential	13,078		13,287
Residential - EBO	1,171		1,223
Construction and land development	4,746		4,862
Other	150		161
Total loans HFI	50,700		50,297
Allowance for credit losses	(340)		(337)
Total loans HFI, net of allowance	$	50,360	$	49,960

Summary of Recorded Investment in Nonaccrual Loans and Loans Past Due 90 Days Still Accruing Interest by Loan Class

Loans are placed on nonaccrual status when management determines that the full repayment of principal and collection of interest according to contractual terms is no longer likely, generally when the loan becomes 90 days or more past due.

The following tables present nonperforming loan balances by loan portfolio segment:

	March 31, 2024
	Nonaccrual with No Allowance for Credit Loss		Nonaccrual with an Allowance for Credit Loss		Total Nonaccrual		Loans Past Due 90 Days or More and Still Accruing
	(in millions)
Municipal & nonprofit	$	—	$	5	$	5	$	—
Tech & innovation	34		28		62		—
Other commercial and industrial	15		20		35		6
CRE - owner occupied	8		2		10		—
Hotel franchise finance	—		12		12		—
Other CRE - non-owner occupied	174		1		175		—
Residential	—		79		79		—
Residential - EBO	—		—		—		349
Construction and land development	19		1		20		—
Other	1		—		1		—
Total	$	251	$	148	$	399	$	355

	December 31, 2023
	Nonaccrual with No Allowance for Credit Loss		Nonaccrual with an Allowance for Credit Loss		Total Nonaccrual		Loans Past Due 90 Days or More and Still Accruing
	(in millions)
Municipal & nonprofit	$	—	$	6	$	6	$	—
Tech & innovation	23		10		33		—
Other commercial and industrial	19		34		53		—
CRE - owner occupied	8		1		9		—
Other CRE - non-owner occupied	82		1		83		—
Residential	—		70		70		—
Residential - EBO	—		—		—		399
Construction and land development	19		—		19		42
Total	$	151	$	122	$	273	$	441

Aging of Loan Portfolio by Loan Portfolio Segment

The following table presents an aging analysis of past due loans by loan portfolio segment:

	March 31, 2024
	Current		30-59 Days Past Due		60-89 Days Past Due		Over 90 days Past Due		Total Past Due		Total
	(in millions)
Warehouse lending	$	6,915	$	—	$	—	$	—	$	—	$	6,915
Municipal & nonprofit	1,622		—		—		—		—		1,622
Tech & innovation	2,941		—		—		—		—		2,941
Equity fund resources	695		—		—		—		—		695
Other commercial and industrial	7,743		5		—		6		11		7,754
CRE - owner occupied	1,706		—		1		—		1		1,707
Hotel franchise finance	3,556		—		—		—		—		3,556
Other CRE - non-owner occupied	6,339		26		—		—		26		6,365
Residential	13,002		66		10		—		76		13,078
Residential - EBO	598		138		86		349		573		1,171
Construction and land development	4,741		5		—		—		5		4,746
Other	147		3		—		—		3		150
Total loans	$	50,005	$	243	$	97	$	355	$	695	$	50,700

	December 31, 2023
	Current		30-59 Days Past Due		60-89 Days Past Due		Over 90 days Past Due		Total Past Due		Total
	(in millions)
Warehouse lending	$	6,618	$	—	$	—	$	—	$	—	$	6,618
Municipal & nonprofit	1,554		—		—		—		—		1,554
Tech & innovation	2,808		—		—		—		—		2,808
Equity fund resources	845		—		—		—		—		845
Other commercial and industrial	7,439		13		—		—		13		7,452
CRE - owner occupied	1,627		—		31		—		31		1,658
Hotel franchise finance	3,824		15		16		—		31		3,855
Other CRE - non-owner occupied	5,974		—		—		—		—		5,974
Residential	13,199		68		20		—		88		13,287
Residential - EBO	545		173		106		399		678		1,223
Construction and land development	4,820		—		—		42		42		4,862
Other	160		1		—		—		1		161
Total loans	$	49,413	$	270	$	173	$	441	$	884	$	50,297

Credit Quality Indicators

The following tables present risk ratings by loan portfolio segment and origination year. The origination year is the year of origination or renewal.

	Term Loan Amortized Cost Basis by Origination Year												Revolving Loans Amortized Cost Basis		Total
As of and for the three months ended March 31, 2024	2024		2023		2022		2021		2020		Prior
	(in millions)
Warehouse lending
Pass	$	17	$	550	$	338	$	7	$	285	$	—	$	5,695	$	6,892
Special mention	—		—		23		—		—		—		—		23
Classified	—		—		—		—		—		—		—		—
Total	$	17	$	550	$	361	$	7	$	285	$	—	$	5,695	$	6,915
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Municipal & nonprofit
Pass	$	59	$	113	$	200	$	166	$	168	$	893	$	—	$	1,599
Special mention	—		—		7		—		11		—		—		18
Classified	—		—		—		—		—		5		—		5
Total	$	59	$	113	$	207	$	166	$	179	$	898	$	—	$	1,622
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Tech & innovation
Pass	$	256	$	756	$	650	$	171	$	25	$	101	$	815	$	2,774
Special mention	—		9		30		10		—		—		8		57
Classified	—		13		50		1		5		—		41		110
Total	$	256	$	778	$	730	$	182	$	30	$	101	$	864	$	2,941
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Equity fund resources
Pass	$	19	$	78	$	92	$	40	$	2	$	—	$	463	$	694
Special mention	—		—		—		—		—		—		—		—
Classified	—		—		—		—		1		—		—		1
Total	$	19	$	78	$	92	$	40	$	3	$	—	$	463	$	695
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Other commercial and industrial
Pass	$	570	$	1,533	$	1,348	$	503	$	153	$	236	$	3,242	$	7,585
Special mention	—		—		1		—		—		1		—		2
Classified	1		88		24		48		1		4		1		167
Total	$	571	$	1,621	$	1,373	$	551	$	154	$	241	$	3,243	$	7,754
Current period gross charge-offs	$	—	$	—	$	0.1	$	2.0	$	—	$	0.1	$	0.1	$	2.3
CRE - owner occupied
Pass	$	35	$	180	$	377	$	320	$	155	$	551	$	40	$	1,658
Special mention	—		—		2		—		—		—		—		2
Classified	—		2		1		4		1		39		—		47
Total	$	35	$	182	$	380	$	324	$	156	$	590	$	40	$	1,707
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Hotel franchise finance
Pass	$	97	$	563	$	1,449	$	474	$	94	$	571	$	132	$	3,380
Special mention	—		34		—		67		—		—		—		101
Classified	—		—		—		20		—		55		—		75
Total	$	97	$	597	$	1,449	$	561	$	94	$	626	$	132	$	3,556
Current period gross charge-offs	$	—	$	—	$	—	$	1.4	$	—	$	1.5	$	—	$	2.9

	Term Loan Amortized Cost Basis by Origination Year												Revolving Loans Amortized Cost Basis		Total
As of and for the three months ended March 31, 2024	2024		2023		2022		2021		2020		Prior
	(in millions)
Other CRE - non-owner occupied
Pass	$	452	$	1,678	$	1,862	$	780	$	413	$	346	$	446	$	5,977
Special mention	—		94		49		—		40		—		—		183
Classified	—		98		—		93		1		13		—		205
Total	$	452	$	1,870	$	1,911	$	873	$	454	$	359	$	446	$	6,365
Current period gross charge-offs	$	—	$	—	$	—	$	5.0	$	—	$	—	$	—	$	5.0
Residential
Pass	$	78	$	278	$	3,513	$	7,890	$	805	$	458	$	23	$	13,045
Special mention	—		—		—		—		—		—		—		—
Classified	—		—		32		35		5		7		—		79
Cumulative fair value hedging adjustment	—		—		—		—		—		—		—		(46)
Total	$	78	$	278	$	3,545	$	7,925	$	810	$	465	$	23	$	13,078
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Residential - EBO
Pass	$	—	$	11	$	17	$	220	$	513	$	410	$	—	$	1,171
Special mention	—		—		—		—		—		—		—		—
Classified	—		—		—		—		—		—		—		—
Total	$	—	$	11	$	17	$	220	$	513	$	410	$	—	$	1,171
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Construction and land development
Pass	$	68	$	906	$	2,085	$	325	$	11	$	—	$	1,276	$	4,671
Special mention	—		—		5		—		—		—		—		5
Classified	—		—		19		—		51		—		—		70
Total	$	68	$	906	$	2,109	$	325	$	62	$	—	$	1,276	$	4,746
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Other
Pass	$	2	$	1	$	10	$	2	$	11	$	68	$	52	$	146
Special mention	—		—		—		—		—		3		—		3
Classified	—		—		—		—		—		1		—		1
Total	$	2	$	1	$	10	$	2	$	11	$	72	$	52	$	150
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Total by Risk Category
Pass	$	1,653	$	6,647	$	11,941	$	10,898	$	2,635	$	3,634	$	12,184	$	49,592
Special mention	—		137		117		77		51		4		8		394
Classified	1		201		126		201		65		124		42		760
Cumulative fair value hedging adjustment	—		—		—		—		—		—		—		(46)
Total	$	1,654	$	6,985	$	12,184	$	11,176	$	2,751	$	3,762	$	12,234	$	50,700
Current period gross charge-offs	$	—	$	—	$	0.1	$	8.4	$	—	$	1.6	$	0.1	$	10.2

	Term Loan Amortized Cost Basis by Origination Year												Revolving Loans Amortized Cost Basis		Total
As of December 31, 2023 and gross charge-offs for the three months ended March 31, 2023	2023		2022		2021		2020		2019		Prior
	(in millions)
Warehouse lending
Pass	$	582	$	323	$	7	$	289	$	—	$	—	$	5,391	$	6,592
Special mention	—		—		—		—		—		—		26		26
Classified	—		—		—		—		—		—		—		—
Total	$	582	$	323	$	7	$	289	$	—	$	—	$	5,417	$	6,618
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Municipal & nonprofit
Pass	$	102	$	167	$	176	$	169	$	68	$	848	$	—	$	1,530
Special mention	—		7		—		11		—		—		—		18
Classified	—		—		—		—		6		—		—		6
Total	$	102	$	174	$	176	$	180	$	74	$	848	$	—	$	1,554
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Tech & innovation
Pass	$	758	$	774	$	206	$	22	$	66	$	38	$	816	$	2,680
Special mention	5		30		12		—		—		—		1		48
Classified	15		52		1		5		—		—		7		80
Total	$	778	$	856	$	219	$	27	$	66	$	38	$	824	$	2,808
Current period gross charge-offs	$	1.8	$	—	$	—	$	—	$	—	$	—	$	—	$	1.8
Equity fund resources
Pass	$	154	$	62	$	21	$	3	$	1	$	—	$	604	$	845
Special mention	—		—		—		—		—		—		—		—
Classified	—		—		—		—		—		—		—		—
Total	$	154	$	62	$	21	$	3	$	1	$	—	$	604	$	845
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Other commercial and industrial
Pass	$	1,610	$	1,454	$	559	$	185	$	77	$	196	$	3,186	$	7,267
Special mention	90		1		1		—		—		—		1		93
Classified	1		25		59		2		4		—		1		92
Total	$	1,701	$	1,480	$	619	$	187	$	81	$	196	$	3,188	$	7,452
Current period gross charge-offs	$	—	$	—	$	5.9	$	1.2	$	—	$	0.1	$	0.1	$	7.3
CRE - owner occupied
Pass	$	165	$	344	$	322	$	163	$	132	$	444	$	40	$	1,610
Special mention	—		—		—		—		—		1		—		1
Classified	2		1		4		1		1		38		—		47
Total	$	167	$	345	$	326	$	164	$	133	$	483	$	40	$	1,658
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Hotel franchise finance
Pass	$	593	$	1,535	$	566	$	95	$	419	$	165	$	132	$	3,505
Special mention	34		—		66		—		35		68		—		203
Classified	24		8		48		—		43		24		—		147
Total	$	651	$	1,543	$	680	$	95	$	497	$	257	$	132	$	3,855
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Other CRE - non-owner occupied
Pass	$	1,832	$	1,784	$	754	$	457	$	166	$	206	$	387	$	5,586
Special mention	164		—		16		43		28		—		—		251
Classified	28		—		93		1		14		1		—		137
Total	$	2,024	$	1,784	$	863	$	501	$	208	$	207	$	387	$	5,974
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—

	Term Loan Amortized Cost Basis by Origination Year												Revolving Loans Amortized Cost Basis		Total
As of December 31, 2023 and gross charge-offs for the three months ended March 31, 2023	2023		2022		2021		2020		2019		Prior
	(in millions)
Residential
Pass	$	324	$	3,573	$	7,985	$	819	$	270	$	207	$	20	$	13,198
Special mention	—		—		—		—		—		—		—		—
Classified	1		26		33		4		4		2		—		70
Cumulative fair value hedging adjustment	—		—		—		—		—		—		—		19
Total	$	325	$	3,599	$	8,018	$	823	$	274	$	209	$	20	$	13,287
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Residential - EBO
Pass	$	2	$	8	$	227	$	534	$	231	$	221	$	—	$	1,223
Special mention	—		—		—		—		—		—		—		—
Classified	—		—		—		—		—		—		—		—
Total	$	2	$	8	$	227	$	534	$	231	$	221	$	—	$	1,223
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Construction and land development
Pass	$	1,013	$	2,231	$	385	$	10	$	—	$	—	$	1,151	$	4,790
Special mention	—		—		—		—		—		—		—		—
Classified	1		19		—		52		—		—		—		72
Total	$	1,014	$	2,250	$	385	$	62	$	—	$	—	$	1,151	$	4,862
Current period gross charge-offs	$	—	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Other
Pass	$	4	$	10	$	3	$	11	$	3	$	62	$	66	$	159
Special mention	—		—		—		—		—		1		—		1
Classified	—		—		—		—		—		1		—		1
Total	$	4	$	10	$	3	$	11	$	3	$	64	$	66	$	161
Current period gross charge-offs	$	—	$	0.1	$	—	$	—	$	—	$	—	$	—	$	0.1
Total by Risk Category
Pass	$	7,139	$	12,265	$	11,211	$	2,757	$	1,433	$	2,387	$	11,793	$	48,985
Special mention	293		38		95		54		63		70		28		641
Classified	72		131		238		65		72		66		8		652
Cumulative fair value hedging adjustment	—		—		—		—		—		—		—		19
Total	$	7,504	$	12,434	$	11,544	$	2,876	$	1,568	$	2,523	$	11,829	$	50,297
Current period gross charge-offs	$	1.8	$	0.1	$	5.9	$	1.2	$	—	$	0.1	$	0.1	$	9.2

Amortized Cost Basis of Loans Modified

The following tables present loan modifications during the period to borrowers experiencing financial difficulty:

	Amortized Cost Basis at March 31, 2024
	Payment Delay and Term Extension		Term Extension		Payment Delay		Total		% of Total Class of Financing Receivable
Three Months Ended	(dollars in millions)
Tech & innovation	$	—	$	—	$	30	$	30	1.0	%
Other commercial and industrial	—		8		—		8		0.1
CRE - owner occupied	—		31		—		31		1.8
Construction and land development	—		39		—		39		0.8
Total	$	—	$	78	$	30	$	108	0.2	%

	Amortized Cost Basis at March 31, 2023
	Payment Delay and Term Extension		Term Extension		Payment Delay		Total		% of Total Class of Financing Receivable
Three Months Ended	(dollars in millions)
Tech & innovation	$	2	$	—	$	5	$	7	0.3	%
Hotel franchise finance	—		18		—		18		0.5	%
Residential	—		—		1		1		0.0	%
Total	$	2	$	18	$	6	$	26	0.1	%

Collateral-Dependent Loans

The following table presents the amortized cost basis of collateral-dependent loans by loan portfolio segment:

	March 31, 2024						December 31, 2023
	Real Estate Collateral		Other Collateral		Total		Real Estate Collateral		Other Collateral		Total
	(in millions)
Municipal & nonprofit	$	—	$	5	$	5	$	—	$	6	$	6
Tech & innovation	—		35		35		—		—		—
Other commercial and industrial	—		26		26		—		29		29
CRE - owner occupied	42		—		42		43		—		43
Hotel franchise finance	63		—		63		104		—		104
Other CRE - non-owner occupied	204		—		204		136		—		136
Construction and land development	69		—		69		71		—		71
Total	$	378	$	66	$	444	$	354	$	35	$	389

Allowances for Credit Losses

The below tables reflect the activity in the ACL on loans HFI by loan portfolio segment, which includes an estimate of future recoveries:

	Three Months Ended March 31, 2024
	Balance, December 31, 2023		Provision for (Recovery of) Credit Losses		Charge-offs		Recoveries		Balance, March 31, 2024
	(in millions)
Warehouse lending	$	5.8	$	1.5	$	—	$	—	$	7.3
Municipal & nonprofit	14.7		(0.8)		—		—		13.9
Tech & innovation	42.1		5.9		—		—		48.0
Equity fund resources	1.3		(0.1)		—		—		1.2
Other commercial and industrial	81.4		(12.4)		2.3		(0.4)		67.1
CRE - owner occupied	6.0		0.2		—		—		6.2
Hotel franchise finance	33.4		5.3		2.9		—		35.8
Other CRE - non-owner occupied	96.0		13.7		5.0		—		104.7
Residential	23.1		(1.0)		—		—		22.1
Residential - EBO	—		—		—		—		—
Construction and land development	30.4		1.5		—		—		31.9
Other	2.5		(0.4)		—		—		2.1
Total	$	336.7	$	13.4	$	10.2	$	(0.4)	$	340.3

	Three Months Ended March 31, 2023
	Balance, December 31, 2022		Provision for (Recovery of) Credit Losses		Charge-offs		Recoveries		Balance, March 31, 2023
	(in millions)
Warehouse lending	$	8.4	$	(1.8)	$	—	$	—	$	6.6
Municipal & nonprofit	15.9		2.5		—		—		18.4
Tech & innovation	30.8		7.4		1.8		—		36.4
Equity fund resources	6.4		(3.1)		—		—		3.3
Other commercial and industrial	85.9		(30.7)		7.3		(3.2)		51.1
CRE - owner occupied	7.1		1.5		—		—		8.6
Hotel franchise finance	46.9		0.8		—		—		47.7
Other CRE - non-owner occupied	47.4		19.0		—		—		66.4
Residential	30.4		1.3		—		—		31.7
Residential - EBO	—		—		—		—		—
Construction and land development	27.4		4.1		—		—		31.5
Other	3.1		—		0.1		—		3.0
Total	$	309.7	$	1.0	$	9.2	$	(3.2)	$	304.7

The below table reflects the activity in the ACL on unfunded loan commitments:

	Three Months Ended March 31,
	2024		2023
	(in millions)
Balance, beginning of period	$	31.6	$	47.0
Provision for (Recovery of) credit losses	1.5		(2.2)
Balance, end of period	$	33.1	$	44.8

The following tables disaggregate the Company's ACL on funded loans HFI and loan balances by measurement methodology:

	March 31, 2024
	Loans						Allowance
	Collectively Evaluated for Credit Loss		Individually Evaluated for Credit Loss		Total		Collectively Evaluated for Credit Loss		Individually Evaluated for Credit Loss		Total
	(in millions)
Warehouse lending	$	6,915	$	—	$	6,915	$	7.3	$	—	$	7.3
Municipal & nonprofit	1,617		5		1,622		13.2		0.7		13.9
Tech & innovation	2,832		109		2,941		40.8		7.2		48.0
Equity fund resources	695		—		695		1.2		—		1.2
Other commercial and industrial	7,591		163		7,754		62.5		4.6		67.1
CRE - owner occupied	1,664		43		1,707		6.2		—		6.2
Hotel franchise finance	3,481		75		3,556		35.4		0.4		35.8
Other CRE - non-owner occupied	6,161		204		6,365		104.7		—		104.7
Residential	13,078		—		13,078		22.1		—		22.1
Residential EBO	1,171		—		1,171		—		—		—
Construction and land development	4,676		70		4,746		31.9		—		31.9
Other	149		1		150		2.1		—		2.1
Total	$	50,030	$	670	$	50,700	$	327.4	$	12.9	$	340.3

	December 31, 2023
	Loans						Allowance
	Collectively Evaluated for Credit Loss		Individually Evaluated for Credit Loss		Total		Collectively Evaluated for Credit Loss		Individually Evaluated for Credit Loss		Total
	(in millions)
Warehouse lending	$	6,618	$	—	$	6,618	$	5.8	$	—	$	5.8
Municipal & nonprofit	1,548		6		1,554		13.7		1.0		14.7
Tech & innovation	2,729		79		2,808		38.3		3.8		42.1
Equity fund resources	845		—		845		1.3		—		1.3
Other commercial and industrial	7,362		90		7,452		64.6		16.8		81.4
CRE - owner occupied	1,613		45		1,658		6.0		—		6.0
Hotel franchise finance	3,708		147		3,855		33.4		—		33.4
Other CRE - non-owner occupied	5,838		136		5,974		96.0		—		96.0
Residential	13,287		—		13,287		23.1		—		23.1
Residential EBO	1,223		—		1,223		—		—		—
Construction and land development	4,791		71		4,862		30.4		—		30.4
Other	161		—		161		2.5		—		2.5
Total	$	49,723	$	574	$	50,297	$	315.1	$	21.6	$	336.7

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Mortgage Servicing Rights (Tables)

3 Months Ended

Mar. 31, 2024

Transfers and Servicing [Abstract]

Changes in Fair Value of the Company's MSR Portfolio

The following table presents the changes in fair value of the Company's MSR portfolio related to its mortgage banking business and other information related to its servicing portfolio:

	Three Months Ended March 31,
	2024		2023
	(in millions)
Balance, beginning of period	$	1,124	$	1,148
Additions from loans sold with servicing rights retained	189		142
Carrying value of MSRs sold	(156)		(350)
Change in fair value	60		(8)
Mark to market adjustments	—		3
Realization of cash flows	(39)		(25)
Balance, end of period	$	1,178	$	910
Unpaid principal balance of mortgage loans serviced for others	$	65,620	$	58,466

Effect of Hypothetical Changes in the Fair Value of MSRs

The following table presents the effect of hypothetical changes in the fair value of MSRs caused by assumed immediate changes in interest rates, discount rates, and prepayment speeds that are used to determine fair value:

	March 31, 2024
	(in millions)
Fair value of mortgage servicing rights	$	1,178
Increase (decrease) in fair value resulting from:
Interest rate change of 50 basis points
Adverse change	(65)
Favorable change	57
Discount rate change of 50 basis points
Increase	(23)
Decrease	24
Conditional prepayment rate change of 1%
Increase	(33)
Decrease	36
Cost to service change of 10%
Increase	(14)
Decrease	14

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Deposits (Tables)

3 Months Ended

Mar. 31, 2024

Other Liabilities Disclosure [Abstract]

Deposits by Type

The table below summarizes deposits by type:

	March 31, 2024		December 31, 2023
	(in millions)
Non-interest-bearing demand deposits	$	18,399	$	14,520
Interest-bearing transaction accounts	16,965		15,916
Savings and money market accounts	16,194		14,791
Time certificates of deposit ($250,000 or more)	1,683		1,478
Other time deposits (1)	8,987		8,628
Total deposits	$	62,228	$	55,333

(1)    Retail brokered time deposits over $250,000 of $5.7 billion and $5.8 billion as of March 31, 2024 and December 31, 2023, respectively, are included within Other time deposits as these deposits are generally participated out by brokers in shares below the FDIC insurance limit.

Summary of Contractual Maturities for Time Deposits

A summary of the contractual maturities for all time deposits as of March 31, 2024 is as follows: 

	(in millions)
2024	$	8,311
2025	2,328
2026	26
2027	3
2028	1
Thereafter	1
Total	$	10,670

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Other Borrowings (Tables)

3 Months Ended

Mar. 31, 2024

Debt Disclosure [Abstract]

Company's Borrowings

The following table summarizes the Company’s other borrowings by type: 

	March 31, 2024		December 31, 2023
	(in millions)
Short-Term:
Federal funds purchased	$	—	$	175
FHLB advances	5,750		6,200
Repurchase agreements	8		382
Secured borrowings	22		27
Total short-term borrowings	$	5,780	$	6,784
Long-Term:
Credit linked notes, net	441		446
Total long-term borrowings	$	441	$	446
Total other borrowings	$	6,221	$	7,230

The Company's outstanding credit linked note issuances are detailed in the tables below:

March 31, 2024
Description	Issuance Date	Maturity Date	Interest Rate	Principal		Debt Issuance Costs
				(in millions)
Residential mortgage loans (1)	December 12, 2022	October 25, 2052	SOFR + 7.80%	$	89	$	2
Residential mortgage loans (2)	June 30, 2022	April 25, 2052	SOFR + 6.00%	177		3
Residential mortgage loans (3)	December 29, 2021	July 25, 2059	SOFR + 4.67%	189		2
Total				$	455	$	7

December 31, 2023
Description	Issuance Date	Maturity Date	Interest Rate	Principal		Debt Issuance Costs
				(in millions)
Residential mortgage loans (1)	December 12, 2022	October 25, 2052	SOFR + 7.80%	$	90	$	2
Residential mortgage loans (2)	June 30, 2022	April 25, 2052	SOFR + 6.00%	179		3
Residential mortgage loans (3)	December 29, 2021	July 25, 2059	SOFR + 4.67%	191		3
Total				$	460	$	8

(1)    There are multiple classes of these notes, each with an interest rate of SOFR plus a spread that ranges from 2.25% to 11.00% (or, a weighted average spread of 7.80%) on a reference pool balance of $1.8 billion as of March 31, 2024 and December 31, 2023.

(2)    There are multiple classes of these notes, each with an interest rate of SOFR plus a spread that ranges from 2.25% to 15.00% (or, a weighted average spread of 6.00%) on a reference pool balance of $3.5 billion and $3.6 billion as of March 31, 2024 and December 31, 2023, respectively.

(3)    There are six classes of these notes, each with an interest rate of SOFR plus a spread that ranges from 3.15% to 8.50% (or, a weighted average spread of 4.67%) on a reference pool balance of $3.7 billion and $3.8 billion as of March 31, 2024 and December 31, 2023, respectively.

The Company's subordinated debt issuances are detailed in the tables below:

March 31, 2024
Description	Issuance Date	Maturity Date	Interest Rate		Principal		Debt Issuance Costs
					(in millions)
WAL fixed-to-variable-rate (1)	June 2021	June 15, 2031	3.00	%	$	600	$	6
WAB fixed-to-variable-rate (2)	May 2020	June 1, 2030	5.25	%	225		1
Total					$	825	$	7

December 31, 2023
Description	Issuance Date	Maturity Date	Interest Rate		Principal		Debt Issuance Costs
					(in millions)
WAL fixed-to-variable-rate (1)	June 2021	June 15, 2031	3.00	%	$	600	$	6
WAB fixed-to-variable-rate (2)	May 2020	June 1, 2030	5.25	%	225		1
Total					$	825	$	7

(1)    Notes are redeemable, in whole or in part, beginning on June 15, 2026 at their principal amount plus accrued and unpaid interest and has a fixed interest rate of 3.00%. The notes also convert to a variable rate of three-month SOFR plus 225 basis points on this date.

(2)    Debt is redeemable, in whole or in part, on or after June 1, 2025 at its principal amount plus accrued and unpaid interest and has a fixed interest rate of 5.25% through June 1, 2025 and then converts to a variable rate per annum equal to three-month SOFR plus 512 basis points.

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Qualifying Debt (Tables)

3 Months Ended

Mar. 31, 2024

Debt Disclosure [Abstract]

Company's Borrowings

The following table summarizes the Company’s other borrowings by type: 

	March 31, 2024		December 31, 2023
	(in millions)
Short-Term:
Federal funds purchased	$	—	$	175
FHLB advances	5,750		6,200
Repurchase agreements	8		382
Secured borrowings	22		27
Total short-term borrowings	$	5,780	$	6,784
Long-Term:
Credit linked notes, net	441		446
Total long-term borrowings	$	441	$	446
Total other borrowings	$	6,221	$	7,230

The Company's outstanding credit linked note issuances are detailed in the tables below:

March 31, 2024
Description	Issuance Date	Maturity Date	Interest Rate	Principal		Debt Issuance Costs
				(in millions)
Residential mortgage loans (1)	December 12, 2022	October 25, 2052	SOFR + 7.80%	$	89	$	2
Residential mortgage loans (2)	June 30, 2022	April 25, 2052	SOFR + 6.00%	177		3
Residential mortgage loans (3)	December 29, 2021	July 25, 2059	SOFR + 4.67%	189		2
Total				$	455	$	7

December 31, 2023
Description	Issuance Date	Maturity Date	Interest Rate	Principal		Debt Issuance Costs
				(in millions)
Residential mortgage loans (1)	December 12, 2022	October 25, 2052	SOFR + 7.80%	$	90	$	2
Residential mortgage loans (2)	June 30, 2022	April 25, 2052	SOFR + 6.00%	179		3
Residential mortgage loans (3)	December 29, 2021	July 25, 2059	SOFR + 4.67%	191		3
Total				$	460	$	8

(1)    There are multiple classes of these notes, each with an interest rate of SOFR plus a spread that ranges from 2.25% to 11.00% (or, a weighted average spread of 7.80%) on a reference pool balance of $1.8 billion as of March 31, 2024 and December 31, 2023.

(2)    There are multiple classes of these notes, each with an interest rate of SOFR plus a spread that ranges from 2.25% to 15.00% (or, a weighted average spread of 6.00%) on a reference pool balance of $3.5 billion and $3.6 billion as of March 31, 2024 and December 31, 2023, respectively.

(3)    There are six classes of these notes, each with an interest rate of SOFR plus a spread that ranges from 3.15% to 8.50% (or, a weighted average spread of 4.67%) on a reference pool balance of $3.7 billion and $3.8 billion as of March 31, 2024 and December 31, 2023, respectively.

The Company's subordinated debt issuances are detailed in the tables below:

March 31, 2024
Description	Issuance Date	Maturity Date	Interest Rate		Principal		Debt Issuance Costs
					(in millions)
WAL fixed-to-variable-rate (1)	June 2021	June 15, 2031	3.00	%	$	600	$	6
WAB fixed-to-variable-rate (2)	May 2020	June 1, 2030	5.25	%	225		1
Total					$	825	$	7

December 31, 2023
Description	Issuance Date	Maturity Date	Interest Rate		Principal		Debt Issuance Costs
					(in millions)
WAL fixed-to-variable-rate (1)	June 2021	June 15, 2031	3.00	%	$	600	$	6
WAB fixed-to-variable-rate (2)	May 2020	June 1, 2030	5.25	%	225		1
Total					$	825	$	7

(1)    Notes are redeemable, in whole or in part, beginning on June 15, 2026 at their principal amount plus accrued and unpaid interest and has a fixed interest rate of 3.00%. The notes also convert to a variable rate of three-month SOFR plus 225 basis points on this date.

(2)    Debt is redeemable, in whole or in part, on or after June 1, 2025 at its principal amount plus accrued and unpaid interest and has a fixed interest rate of 5.25% through June 1, 2025 and then converts to a variable rate per annum equal to three-month SOFR plus 512 basis points.

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Accumulated Other Comprehensive Income (Loss) (Tables)

3 Months Ended

Mar. 31, 2024

Equity [Abstract]

Summary of Changes in Accumulated Other Comprehensive Income

The following table summarizes the changes in accumulated other comprehensive income (loss) by component, net of tax, for the periods indicated: 

	Three Months Ended March 31,
	Unrealized holding gains (losses) on AFS securities		Unrealized holding losses on SERP		Unrealized holding gains (losses) on junior subordinated debt		Impairment loss on securities		Total
	(in millions)
Balance, December 31, 2023	$	(516.6)	$	(0.3)	$	2.8	$	1.2	$	(512.9)
Other comprehensive loss before reclassifications	(44.9)		—		(0.5)		—		(45.4)
Amounts reclassified from AOCI	0.7		—		—		—		0.7
Net current-period other comprehensive loss	(44.2)		—		(0.5)		—		(44.7)
Balance, March 31, 2024	$	(560.8)	$	(0.3)	$	2.3	$	1.2	$	(557.6)
Balance, December 31, 2022	$	(663.7)	$	(0.3)	$	3.0	$	—	$	(661.0)
Other comprehensive income (loss) before reclassifications	60.1		—		(1.1)		—		59.0
Amounts reclassified from AOCI	9.3		—		—		1.2		10.5
Net current-period other comprehensive income (loss)	69.4		—		(1.1)		1.2		69.5
Balance, March 31, 2023	$	(594.3)	$	(0.3)	$	1.9	$	1.2	$	(591.5)

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Derivatives and Hedging Activities (Tables)

3 Months Ended

Mar. 31, 2024

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Assets at Fair Value

As of March 31, 2024 and December 31, 2023, the following amounts are reflected on the Consolidated Balance Sheet related to cumulative basis adjustments for outstanding fair value hedges:

	March 31, 2024				December 31, 2023
	Carrying Value of Hedged Assets/(Liabilities)		Cumulative Fair Value Hedging Adjustment (1)		Carrying Value of Hedged Assets/(Liabilities)		Cumulative Fair Value Hedging Adjustment (1)
	(in millions)
Loans HFI, net of deferred loan fees and costs (2)	$	3,857	$	66	$	3,875	$	(6)

(1)Included in the carrying value of the hedged assets/(liabilities).

(2)As of March 31, 2024, included portfolio layer method derivative instruments with $3.5 billion designated as the hedged amount (from a closed portfolio of prepayable fixed rate loans with a carrying value of $6.6 billion). The cumulative basis adjustment included in the carrying value of these hedged items totaled $(46) million.

Derivative Instruments, Gain (Loss)

For loans, the gain or loss on the hedged item is included in interest income, as shown in the table below.

	Three Months Ended March 31,
	2024				2023
Income Statement Classification	Gain/(Loss) on Swaps		Gain/(Loss) on Hedged Item		Gain/(Loss) on Swaps		Gain/(Loss) on Hedged Item
	(in millions)
Interest income	$	72.0	$	(72.5)	$	(4.3)	$	4.3

The following table summarizes the net gain (loss) on derivatives included in income:

	Three Months Ended March 31,
	2024		2023
	(in millions)
Net gain (loss) on loan origination and sale activities:
Interest rate lock commitments	$	(8.1)	$	11.5
Forward contracts	16.7		(36.8)
Interest rate swaps	(2.2)		1.2
Other contracts	0.7		(0.5)
Total gain (loss)	$	7.1	$	(24.6)
Net loan servicing revenue:
Forward contracts	$	(16.3)	$	(1.6)
Futures contracts	10.7		(4.0)
Interest rate swaps	(36.3)		19.0
Total (loss) gain	$	(41.9)	$	13.4

Schedule of Fair Value of the Company's Derivative Instruments

The following table summarizes the fair value of the Company's derivative instruments on a gross basis as of March 31, 2024, December 31, 2023, and March 31, 2023. The change in the notional amounts of these derivatives from March 31, 2023 to March 31, 2024 indicates the volume of the Company's derivative transaction activity during these periods. The derivative asset and liability balances are presented on a gross basis, prior to the application of bilateral collateral and master netting agreements. Total derivative assets and liabilities are adjusted to take into account the impact of legally enforceable master netting agreements that allow the Company to settle all derivative contracts with the same counterparty on a net basis and to offset the net derivative position with the related cash collateral. Where master netting agreements are not in effect or are not enforceable under bankruptcy laws, the Company does not adjust those derivative amounts with counterparties.

	March 31, 2024						December 31, 2023						March 31, 2023
			Fair Value						Fair Value						Fair Value
	Notional Amount		Derivative Assets		Derivative Liabilities		Notional Amount		Derivative Assets		Derivative Liabilities		Notional Amount		Derivative Assets		Derivative Liabilities
	(in millions)
Derivatives designated as hedging instruments:
Fair value hedges
Interest rate contracts	$	3,884	$	67	$	—	$	3,895	$	19	$	24	$	470	$	14	$	1
Total	$	3,884	$	67	$	—	$	3,895	$	19	$	24	$	470	$	14	$	1
Derivatives not designated as hedging instruments:
Foreign currency contracts	$	165	$	1	$	1	$	135	$	1	$	1	$	189	$	2	$	1
Forward purchase contracts	5,590		13		2		5,544		26		—		7,814		34		5
Forward sales contracts	8,380		4		28		7,626		1		55		9,702		3		64
Futures purchase contracts (1), (2)	124		—		—		124		—		—		—		—		—
Futures sales contracts (1), (2)	9,996		—		—		10,906		—		—		9,710		—		—
Interest rate lock commitments	1,810		10		1		1,822		18		—		1,557		14		1
Interest rate contracts	3,890		20		21		3,628		19		20		1,983		5		6
Risk participation agreements	75		—		—		72		—		—		51		—		—
Equity warrants	57		18		—		55		4		—		50		3		—
Total	$	30,087	$	66	$	53	$	29,912	$	69	$	76	$	31,056	$	61	$	77
Margin			139		8				202		(9)				5		(14)
Total, including margin	$	30,087	$	205	$	61	$	29,912	$	271	$	67	$	31,056	$	66	$	63

(1)The Company enters into futures purchase and sales contracts that are subject to daily remargining and almost all of which are based on three-month SOFR to hedge against its MSR valuation exposure. The notional amount on these contracts is substantial as these contracts have a short duration and are intended to cover the longer duration of MSR hedges.

(2)The notional amounts previously reported for March 31, 2023 have been adjusted to account for the impact of offsetting contracts. To close a futures contract prior to settlement, the Company purchases an offsetting future with the same terms as the original contract and these contracts no longer require settlement.

The fair value of derivative contracts, after taking into account the effects of master netting agreements, is included in Other assets or Other liabilities on the Consolidated Balance Sheet, as summarized in the table below:

	March 31, 2024						December 31, 2023						March 31, 2023
	Gross amount of recognized assets (liabilities)		Gross offset		Net assets (liabilities)		Gross amount of recognized assets (liabilities)		Gross offset		Net assets (liabilities)		Gross amount of recognized assets (liabilities)		Gross offset		Net assets (liabilities)
	(in millions)
Derivatives subject to master netting arrangements:
Assets
Foreign currency contracts	$	1	$	—	$	1	$	—	$	—	$	—	$	—	$	—	$	—
Forward purchase contracts	13		—		13		26		—		26		30		—		30
Forward sales contracts	4		—		4		1		—		1		3		—		3
Interest rate contracts	84		—		84		31		—		31		14		—		14
Margin	139		—		139		202		—		202		5		—		5
Netting	—		(33)		(33)		—		(67)		(67)		—		(38)		(38)
	$	241	$	(33)	$	208	$	260	$	(67)	$	193	$	52	$	(38)	$	14
Liabilities
Foreign currency contracts	$	(1)	$	—	$	(1)	$	(1)	$	—	$	(1)	$	—	$	—	$	—
Forward purchase contracts	(2)		—		(2)		—		—		—		(4)		—		(4)
Forward sales contracts	(27)		—		(27)		(55)		—		(55)		(52)		—		(52)
Interest rate contracts	(2)		—		(2)		(31)		—		(31)		(1)		—		(1)
Margin	(8)		—		(8)		9		—		9		14		—		14
Netting	—		33		33		—		67		67		—		38		38
	$	(40)	$	33	$	(7)	$	(78)	$	67	$	(11)	$	(43)	$	38	$	(5)
Derivatives not subject to master netting arrangements:
Assets
Foreign currency contracts	$	—	$	—	$	—	$	1	$	—	$	1	$	2	$	—	$	2
Forward purchase contracts	—		—		—		—				—		4		—		4
Interest rate lock commitments	10		—		10		18		—		18		14		—		14
Interest rate contracts	3		—		3		7		—		7		5		—		5
Equity warrants	18		—		18		4		—		4		3		—		3
	$	31	$	—	$	31	$	30	$	—	$	30	$	28	$	—	$	28
Liabilities
Foreign currency contracts	$	—	$	—	$	—	$	—	$	—	$	—	$	(1)	$	—	$	(1)
Forward purchase contracts	—		—		—		—		—		—		(1)		—		(1)
Forward sales contracts	(1)		—		(1)		—		—		—		(12)		—		(12)
Interest rate lock commitments	(1)		—		(1)		—		—		—		(1)		—		(1)
Interest rate contracts	(19)		—		(19)		(13)		—		(13)		(6)		—		(6)
	$	(21)	$	—	$	(21)	$	(13)	$	—	$	(13)	$	(21)	$	—	$	(21)
Total derivatives and margin
Assets	$	272	$	(33)	$	239	$	290	$	(67)	$	223	$	80	$	(38)	$	42
Liabilities	$	(61)	$	33	$	(28)	$	(91)	$	67	$	(24)	$	(64)	$	38	$	(26)

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Earnings per Share (Tables)

3 Months Ended

Mar. 31, 2024

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

The following table presents the calculation of basic and diluted EPS: 

	Three Months Ended March 31,
	2024		2023
	(in millions, except per share amounts)
Weighted average shares - basic	108.5		108.1
Dilutive effect of stock awards	0.5		0.2
Weighted average shares - diluted	109.0		108.3
Net income available to common stockholders	$	174.2	$	139.0
Earnings per Common Share:
Basic	$	1.61	$	1.29
Diluted	1.60		1.28

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Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2024

Commitments and Contingencies Disclosure [Abstract]

Summary of Contractual Amounts for Unfunded Commitments and Letters of Credit

A summary of the contractual amounts for unfunded commitments and letters of credit are as follows: 

	March 31, 2024		December 31, 2023
	(in millions)
Commitments to extend credit, including unsecured loan commitments of $937 at March 31, 2024 and $989 at December 31, 2023	$	13,106	$	13,291
Credit card commitments and financial guarantees	427		418
Letters of credit, including unsecured letters of credit of $6 at March 31, 2024 and $4 at December 31, 2023	238		222
Total	$	13,771	$	13,931

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Fair Value Accounting (Tables)

3 Months Ended

Mar. 31, 2024

Fair Value Disclosures [Abstract]

Gains and Losses from Fair Value Changes Included in Consolidated Statement of Operations

The following table presents unrealized gains and losses from fair value changes on junior subordinated debt:

	Three Months Ended March 31,
	2024		2023
	(in millions)
Unrealized losses	$	(0.7)	$	(1.5)
Changes included in OCI, net of tax	(0.5)		(1.1)

Fair Value of Assets and Liabilities

The fair value of assets and liabilities measured at fair value on a recurring basis was determined using the following inputs: 

	Fair Value Measurements at the End of the Reporting Period Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value
March 31, 2024	(in millions)
Assets:
Available-for-sale debt securities
U.S. Treasury securities	$	7,011	$	—	$	—	$	7,011
Residential MBS issued by GSEs	—		4,536		—		4,536
Private label residential MBS	—		1,091		—		1,091
Tax-exempt	—		849		—		849
Commercial MBS issued by GSEs	—		586		—		586
Corporate debt securities	—		367		—		367
Other	28		41		—		69
Total AFS debt securities	$	7,039	$	7,470	$	—	$	14,509
Equity securities
Preferred stock	$	105	$	—	$	—	$	105
CRA investments	25		—		—		25
Total equity securities	$	130	$	—	$	—	$	130
Loans HFS (2)	$	—	$	1,809	$	3	$	1,812
MSRs	—		—		1,178		1,178
Derivative assets (1)	—		105		28		133
Liabilities:
Junior subordinated debt (3)	$	—	$	—	$	64	$	64
Derivative liabilities (1)	—		52		1		53

(1)See "Note 11. Derivatives and Hedging Activities." In addition, the carrying value of loans is decreased by $66 million as of March 31, 2024 for the effective portion of the hedge, which relates to the fair value of the hedges put in place to mitigate against fluctuations in interest rates. Derivative assets and liabilities exclude margin of $139 million and $8 million, respectively.

(2)Includes only the portion of loans HFS that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.

(3)Includes only the portion of junior subordinated debt that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.

	Fair Value Measurements at the End of the Reporting Period Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value
December 31, 2023	(in millions)
Assets:
Available-for-sale debt securities
U.S. Treasury securities	$	4,853	$	—	$	—	$	4,853
Residential MBS issued by GSEs	—		1,972		—		1,972
CLO	—		1,399		—		1,399
Private label residential MBS	—		1,117		—		1,117
Tax-exempt	—		858		—		858
Commercial MBS issued by GSEs	—		530		—		530
Corporate debt securities	—		367		—		367
Other	28		41		—		69
Total AFS debt securities	$	4,881	$	6,284	$	—	$	11,165
Equity securities
Preferred stock	$	100	$	—	$	—	$	100
CRA investments	26		—		—		26
Total equity securities	$	126	$	—	$	—	$	126
Loans - HFS (2)	$	—	$	1,377	$	3	$	1,380
Mortgage servicing rights	—		—		1,124		1,124
Derivative assets (1)	—		66		22		88
Liabilities:
Junior subordinated debt (3)	$	—	$	—	$	63	$	63
Derivative liabilities (1)	—		100		—		100

(1)See "Note 11. Derivatives and Hedging Activities." In addition, the carrying value of loans is increased by $6 million as of December 31, 2023 for the effective portion of the hedge, which relates to the fair value of the hedges put in place to mitigate against fluctuations in interest rates. Derivative assets and liabilities exclude margin of $202 million and $(9) million, respectively.

(2)Includes only the portion of loans HFS that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.

(3)Includes only the portion of junior subordinated debt that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.

Change in Level 3 Liabilities Measured at Fair Value on Recurring Basis

The change in Level 3 liabilities measured at fair value on a recurring basis included in OCI was as follows:

	Junior Subordinated Debt
	Three Months Ended March 31,
	2024		2023
	(in millions)
Beginning balance	$	(62.8)	$	(62.5)
Change in fair value (1)	(0.7)		(1.5)
Ending balance	$	(63.5)	$	(64.0)

(1)Unrealized losses attributable to changes in the fair value of junior subordinated debt are recorded in OCI, net of tax, and totaled $(0.5) million and $(1.1) million for three months ended March 31, 2024 and 2023, respectively.

The change in Level 3 assets and liabilities measured at fair value on a recurring basis included in income was as follows:

	Three Months Ended March 31, 2024
	MSRs		IRLCs (1)
	(in millions)
Balance, beginning of period	$	1,124	$	18
Purchases and additions	189		4,060
Sales and payments	(156)		—
Settlement of IRLCs upon acquisition or origination of loans HFS	—		(4,067)
Change in fair value	60		(1)
Realization of cash flows	(39)		—
Balance, end of period	$	1,178	$	10
Changes in unrealized gains for the period (2)	$	46	$	10

	Three Months Ended March 31, 2023
	MSRs		IRLCs (1)
	(in millions)
Balance, beginning of period	$	1,148	$	2
Purchases and additions	142		2,946
Sales and payments	(350)		—
Settlement of IRLCs upon acquisition or origination of loans HFS	—		(2,935)
Change in fair value	(8)		1
Mark to market adjustments	3		—
Realization of cash flows	(25)		—
Balance, end of period	$	910	$	14
Changes in unrealized gains for the period (2)	$	(3)	$	14

(1)     IRLC asset and liability positions are presented net.

(2)    Amounts recognized as part of non-interest income.

The significant unobservable inputs used in the fair value measurements of these Level 3 assets and liabilities were as follows:

		March 31, 2024
Asset/liability	Key inputs	Range	Weighted average
MSRs:	Option adjusted spread (in basis points)	(43) - 297	213
	Conditional prepayment rate (1)	9.1% - 22.0%	16.1		%
	Recapture rate	20.0% - 20.0%	20		%
	Servicing fee rate (in basis points)	25.0 - 56.5	38.4
	Cost to service	$75 - $95	$	86
IRLCs:	Servicing fee multiple	3.5 - 5.7	4.6
	Pull-through rate	68% - 100%	86		%

		December 31, 2023
Asset/liability	Key inputs	Range	Weighted average
MSRs:	Option adjusted spread (in basis points)	29 - 253	213
	Conditional prepayment rate (1)	9.5% - 23.9%	17.4		%
	Recapture rate	20.0% - 20.0%	20.0		%
	Servicing fee rate (in basis points)	25.0 - 56.5	35.6
	Cost to service	$93 - $100	$	95
IRLCs:	Servicing fee multiple	3.2 - 5.4	4.3
	Pull-through rate	68% - 100%	89		%

(1)    Lifetime total prepayment speed annualized.

For Level 3 assets measured at fair value on a nonrecurring basis as of period end, the significant unobservable inputs used in the fair value measurements were as follows:

	March 31, 2024		Valuation Technique(s)		Significant Unobservable Inputs	Range
	(in millions)
Loans HFI	$	441	Collateral method	Third party appraisal	Costs to sell	6.0% to 10.0%
			Discounted cash flow method	Discount rate	Contractual loan rate	3.0% to 8.0%
				Scheduled cash collections	Probability of default	0% to 20.0%
				Proceeds from non-real estate collateral	Loss given default	0% to 70.0%
Other assets acquired through foreclosure	8		Collateral method	Third party appraisal	Costs to sell	4.0% to 10.0%

	December 31, 2023		Valuation Technique(s)		Significant Unobservable Inputs	Range
	(in millions)
Loans HFI	$	379	Collateral method	Third party appraisal	Costs to sell	6.0% to 10.0%
			Discounted cash flow method	Discount rate	Contractual loan rate	3.0% to 8.0%
				Scheduled cash collections	Probability of default	0% to 20.0%
				Proceeds from non-real estate collateral	Loss given default	0% to 70.0%
Other assets acquired through foreclosure	8		Collateral method	Third party appraisal	Costs to sell	4.0% to 10.0%

Assets Measured at Fair Value on Nonrecurring Basis

The significant unobservable inputs used in the fair value measurements of these Level 3 liabilities were as follows:

	March 31, 2024		Valuation Technique	Significant Unobservable Inputs	Input Value
	(in millions)
Junior subordinated debt	$	64	Discounted cash flow	Implied credit rating of the Company	8.73	%

	December 31, 2023		Valuation Technique	Significant Unobservable Inputs	Input Value
	(in millions)
Junior subordinated debt	$	63	Discounted cash flow	Implied credit rating of the Company	8.92	%

The following table presents such assets carried on the Consolidated Balance Sheet by caption and by level within the ASC 825 hierarchy:

	Fair Value Measurements at the End of the Reporting Period Using
	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Active Markets for Similar Assets (Level 2)		Unobservable Inputs (Level 3)
	(in millions)
As of March 31, 2024:
Loans HFI	$	441	$	—	$	—	$	441
Other assets acquired through foreclosure	8		—		—		8
As of December 31, 2023:
Loans HFI	$	379	$	—	$	—	$	379
Other assets acquired through foreclosure	8		—		—		8

Estimated Fair Value of Financial Instruments

The following is a summary of the difference between the aggregate fair value and the aggregate UPB of loans HFS for which the FVO has been elected:

	March 31, 2024						December 31, 2023
	Fair value		UPB		Difference		Fair value		UPB		Difference
	(in millions)
Loans HFS:
Current through 89 days delinquent	$	1,812	$	1,755	$	57	$	1,379	$	1,319	$	60
90 days or more delinquent	—		—		—		1		2		(1)
Total	$	1,812	$	1,755	$	57	$	1,380	$	1,321	$	59

The estimated fair value of the Company’s financial instruments is as follows:

	March 31, 2024
	Carrying Amount		Fair Value
			Level 1		Level 2		Level 3		Total
	(in millions)
Financial assets:
Investment securities:
HTM	$	1,461	$	—	$	1,253	$	—	$	1,253
AFS	14,509		7,039		7,470		—		14,509
Equity	130		130		—		—		130
Derivative assets (1)	133		—		105		28		133
Loans HFS	1,841		—		1,818		23		1,841
Loans HFI, net	50,360		—		—		47,245		47,245
Mortgage servicing rights	1,178		—		—		1,178		1,178
Accrued interest receivable	360		—		360		—		360
Financial liabilities:
Deposits	$	62,228	$	—	$	62,263	$	—	$	62,263
Other borrowings	6,221		—		6,184		—		6,184
Qualifying debt	896		—		734		77		811
Derivative liabilities (1)	53		—		52		1		53
Accrued interest payable	168		—		168		—		168

(1)    Derivative assets and liabilities exclude margin of $139 million and $8 million, respectively.

	December 31, 2023
	Carrying Amount		Fair Value
			Level 1		Level 2		Level 3		Total
	(in millions)
Financial assets:
Investment securities:
HTM	$	1,429	$	—	$	1,251	$	—	$	1,251
AFS	11,165		4,881		6,284		—		11,165
Equity securities	126		126		—		—		126
Derivative assets (1)	84		—		66		18		84
Loans HFS	1,402		—		1,379		23		1,402
Loans HFI, net	49,960		—		—		46,877		46,877
Mortgage servicing rights	1,124		—		—		1,124		1,124
Accrued interest receivable	370		—		370		—		370
Financial liabilities:
Deposits	$	55,333	$	—	$	55,379	$	—	$	55,379
Other borrowings	7,230		—		7,192		—		7,192
Qualifying debt	895		—		734		76		810
Derivative liabilities (1)	100		—		100		—		100
Accrued interest payable	151		—		151		—		151

(1)    Derivative assets and liabilities exclude margin of $202 million and $(9) million, respectively.

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Segments (Tables)

3 Months Ended

Mar. 31, 2024

Segment Reporting [Abstract]

Operating Segment Information

The following is a summary of operating segment information for the periods indicated:

Balance Sheet:	Consolidated Company		Commercial		Consumer Related		Corporate & Other
At March 31, 2024:	(in millions)
Assets:
Cash, cash equivalents, and investments	$	19,890	$	12	$	—	$	19,878
Loans HFS	1,841		—		1,841		—
Loans HFI, net of deferred fees and costs	50,700		29,642		21,058		—
Less: allowance for credit losses	(340)		(287)		(53)		—
Net loans HFI	50,360		29,355		21,005		—
Other assets acquired through foreclosure, net	8		8		—		—
Goodwill and other intangible assets, net	666		291		375		—
Other assets	4,224		414		1,961		1,849
Total assets	$	76,989	$	30,080	$	25,182	$	21,727
Liabilities:
Deposits	$	62,228	$	25,146	$	30,481	$	6,601
Borrowings and qualifying debt	7,117		9		21		7,087
Other liabilities	1,472		139		421		912
Total liabilities	70,817		25,294		30,923		14,600
Allocated equity:	6,172		2,590		1,814		1,768
Total liabilities and stockholders' equity	$	76,989	$	27,884	$	32,737	$	16,368
Excess funds provided (used)	—		(2,196)		7,555		(5,359)
Income Statement:
Three Months Ended March 31, 2024:	(in millions)
Net interest income	$	598.9	$	288.8	$	292.6	$	17.5
Provision for (recovery of) credit losses	15.2		15.3		(0.4)		0.3
Net interest income after provision for credit losses	583.7		273.5		293.0		17.2
Non-interest income	129.9		26.1		95.7		8.1
Non-interest expense	481.8		156.0		295.9		29.9
Income before income taxes	231.8		143.6		92.8		(4.6)
Income tax expense (benefit)	54.4		33.7		21.8		(1.1)
Net income (loss)	$	177.4	$	109.9	$	71.0	$	(3.5)

Balance Sheet:	Consolidated Company		Commercial		Consumer Related		Corporate
At December 31, 2023:	(in millions)
Assets:
Cash, cash equivalents, and investments	$	14,569	$	13	$	125	$	14,431
Loans held for sale	1,402		—		1,402		—
Loans, net of deferred fees and costs	50,297		29,136		21,161		—
Less: allowance for credit losses	(337)		(284)		(53)		—
Total loans	49,960		28,852		21,108		—
Other assets acquired through foreclosure, net	8		8		—		—
Goodwill and other intangible assets, net	669		292		377		—
Other assets	4,254		390		1,826		2,038
Total assets	$	70,862	$	29,555	$	24,838	$	16,469
Liabilities:
Deposits	$	55,333	$	23,897	$	24,925	$	6,511
Borrowings and qualifying debt	8,125		7		402		7,716
Other liabilities	1,326		109		338		879
Total liabilities	64,784		24,013		25,665		15,106
Allocated equity:	6,078		2,555		1,790		1,733
Total liabilities and stockholders' equity	$	70,862	$	26,568	$	27,455	$	16,839
Excess funds provided (used)	—		(2,987)		2,617		370
Income Statements:
Three Months Ended March 31, 2023:	(in millions)
Net interest income	$	609.9	$	389.4	$	199.3	$	21.2
Provision for (recovery of) credit losses	19.4		(2.7)		1.5		20.6
Net interest income after provision for credit losses	590.5		392.1		197.8		0.6
Non-interest income	(58.0)		(96.7)		51.0		(12.3)
Non-interest expense	347.9		136.0		192.0		19.9
Income (loss) before income taxes	184.6		159.4		56.8		(31.6)
Income tax expense (benefit)	42.4		38.5		12.8		(8.9)
Net income (loss)	$	142.2	$	120.9	$	44.0	$	(22.7)

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Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2024 Subsidiary
Significant Of Accounting Policies [Line Items]
Number of unconsolidated subsidiaries	8

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Investment Securities - Carrying Amounts and Fair Values of Investment Securities (Detail) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Held-to-maturity
Amortized cost	$ 1,461.0	$ 1,429.0
Gross unrealized gains	0.0	1.0
Gross unrealized (losses)	(208.0)	(179.0)
Investment securities - HTM, fair value	1,253.0	1,251.0
Available-for-sale debt securities
Amortized Cost	15,251.0	11,849.0
Gross unrealized gains	12.0	18.0
Gross unrealized (losses)	(754.0)	(702.0)
Fair value	14,509.0	11,165.0
Tax-exempt
Held-to-maturity
Amortized cost	1,278.0	1,243.0
Gross unrealized gains	0.0	1.0
Gross unrealized (losses)	(169.0)	(140.0)
Investment securities - HTM, fair value	1,109.0	1,104.0
Available-for-sale debt securities
Amortized Cost	927.0	925.0
Gross unrealized gains	0.0	0.0
Gross unrealized (losses)	(78.0)	(67.0)
Fair value	849.0	858.0
Private label residential MBS
Held-to-maturity
Amortized cost	183.0	186.0
Gross unrealized gains	0.0	0.0
Gross unrealized (losses)	(39.0)	(39.0)
Investment securities - HTM, fair value	144.0	147.0
Available-for-sale debt securities
Amortized Cost	1,301.0	1,320.0
Gross unrealized gains	1.0	1.0
Gross unrealized (losses)	(211.0)	(204.0)
Fair value	1,091.0	1,117.0
U.S. Treasury securities
Available-for-sale debt securities
Amortized Cost	7,019.0	4,853.0
Gross unrealized gains	0.0	1.0
Gross unrealized (losses)	(8.0)	(1.0)
Fair value	7,011.0	4,853.0
Residential MBS issued by GSEs
Available-for-sale debt securities
Amortized Cost	4,928.0	2,328.0
Gross unrealized gains	3.0	3.0
Gross unrealized (losses)	(395.0)	(359.0)
Fair value	4,536.0	1,972.0
Commercial MBS issued by GSEs
Available-for-sale debt securities
Amortized Cost	591.0	531.0
Gross unrealized gains	5.0	8.0
Gross unrealized (losses)	(10.0)	(9.0)
Fair value	586.0	530.0
Corporate debt securities
Available-for-sale debt securities
Amortized Cost	411.0	411.0
Gross unrealized gains	0.0	0.0
Gross unrealized (losses)	(44.0)	(44.0)
Fair value	367.0	367.0
Other
Available-for-sale debt securities
Amortized Cost	74.0	74.0
Gross unrealized gains	3.0	4.0
Gross unrealized (losses)	(8.0)	(9.0)
Fair value	$ 69.0	69.0
CLO
Available-for-sale debt securities
Amortized Cost		1,407.0
Gross unrealized gains		1.0
Gross unrealized (losses)		(9.0)
Fair value		$ 1,399.0

XML

Investment Securities - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($) security	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	$ 130.0		$ 126.0
Unrealized gains (losses) on assets measured at fair value, net	$ 3.9	$ (8.5)
Number of AFS debt securities in an unrealized loss position | security	770		708
Fair value	$ 14,509.0		$ 11,165.0
Provision for Credit Losses	(0.1)	19.3
Charge-offs	0.0	(17.1)
Accrued interest receivable	5.0		5.0
Carrying value of securities sold	1,400.0	459.0
Net gain (loss) recognized	(0.9)	$ (12.5)
Asset Pledged as Collateral
Debt Securities, Available-for-sale [Line Items]
Fair value	$ 8,000.0		$ 7,700.0

XML

Investment Securities - Unrealized Losses and Fair Value of Investment Securities in Continuous Unrealized Loss Position (Detail) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Less Than Twelve Months, Gross Unrealized Losses	$ 15	$ 7
Less Than Twelve Months, Fair Value	7,633	2,449
More Than Twelve Months, Gross Unrealized Losses	739	695
More Than Twelve Months, Fair Value	3,849	4,655
Total Gross Unrealized Losses	754	702
Total Fair Value	11,482	7,104
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Less Than Twelve Months, Gross Unrealized Losses	8	1
Less Than Twelve Months, Fair Value	6,338	2,208
More Than Twelve Months, Gross Unrealized Losses	0	0
More Than Twelve Months, Fair Value	0	0
Total Gross Unrealized Losses	8	1
Total Fair Value	6,338	2,208
Residential MBS issued by GSEs
Debt Securities, Available-for-sale [Line Items]
Less Than Twelve Months, Gross Unrealized Losses	5	3
Less Than Twelve Months, Fair Value	1,125	174
More Than Twelve Months, Gross Unrealized Losses	390	356
More Than Twelve Months, Fair Value	1,570	1,551
Total Gross Unrealized Losses	395	359
Total Fair Value	2,695	1,725
Private label residential MBS
Debt Securities, Available-for-sale [Line Items]
Less Than Twelve Months, Gross Unrealized Losses	0	0
Less Than Twelve Months, Fair Value	0	0
More Than Twelve Months, Gross Unrealized Losses	211	204
More Than Twelve Months, Fair Value	997	1,020
Total Gross Unrealized Losses	211	204
Total Fair Value	997	1,020
Tax-exempt
Debt Securities, Available-for-sale [Line Items]
Less Than Twelve Months, Gross Unrealized Losses	1	3
Less Than Twelve Months, Fair Value	33	67
More Than Twelve Months, Gross Unrealized Losses	77	64
More Than Twelve Months, Fair Value	815	773
Total Gross Unrealized Losses	78	67
Total Fair Value	848	840
Commercial MBS issued by GSEs
Debt Securities, Available-for-sale [Line Items]
Less Than Twelve Months, Gross Unrealized Losses	1	0
Less Than Twelve Months, Fair Value	137	0
More Than Twelve Months, Gross Unrealized Losses	9	9
More Than Twelve Months, Fair Value	52	53
Total Gross Unrealized Losses	10	9
Total Fair Value	189	53
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Less Than Twelve Months, Gross Unrealized Losses	0	0
Less Than Twelve Months, Fair Value	0	0
More Than Twelve Months, Gross Unrealized Losses	44	44
More Than Twelve Months, Fair Value	360	359
Total Gross Unrealized Losses	44	44
Total Fair Value	360	359
Corporate Bond Securities, With ACL
Debt Securities, Available-for-sale [Line Items]
Total Gross Unrealized Losses	6	8
Total Fair Value	22	54
Other
Debt Securities, Available-for-sale [Line Items]
Less Than Twelve Months, Gross Unrealized Losses	0	0
Less Than Twelve Months, Fair Value	0	0
More Than Twelve Months, Gross Unrealized Losses	8	9
More Than Twelve Months, Fair Value	55	54
Total Gross Unrealized Losses	8	9
Total Fair Value	$ 55	54
CLO
Debt Securities, Available-for-sale [Line Items]
Less Than Twelve Months, Gross Unrealized Losses		0
Less Than Twelve Months, Fair Value		0
More Than Twelve Months, Gross Unrealized Losses		9
More Than Twelve Months, Fair Value		845
Total Gross Unrealized Losses		9
Total Fair Value		$ 845

XML

Investment Securities - Allowance for Credit Losses, Available-for-Sale (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 1.4	$ 0.0
Recovery of Credit Losses	(0.1)	19.3
Charge-offs	0.0	(17.1)
Recoveries	0.0	0.0
Ending balance	$ 1.3	$ 2.2

XML

Investment Securities - Allowance for Credit Losses, Held-to-Maturity (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 8.0
Ending balance	8.0
Tax-exempt
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward]
Beginning balance	7.8	$ 5.2
Provision for Credit Losses	0.4	1.3
Charge-offs	0.0	0.0
Recoveries	0.0	0.0
Ending balance	$ 8.2	$ 6.5

XML

Investment Securities - Investment Securities by Credit Rating Type (Detail) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Schedule of Held-to-Maturity Securities [Line Items]
Amortized cost	$ 1,461.0	$ 1,429.0
Fair value	14,509.0	11,165.0
Investment securities - equity	130.0	126.0
AAA
Schedule of Held-to-Maturity Securities [Line Items]
Amortized cost	0.0	0.0
Fair value	1,073.0	1,178.0
Investment securities - equity	0.0	0.0
Split-rated AAA/AA+
Schedule of Held-to-Maturity Securities [Line Items]
Amortized cost	0.0	0.0
Fair value	12,148.0	7,371.0
Investment securities - equity	25.0	26.0
AA+ to AA-
Schedule of Held-to-Maturity Securities [Line Items]
Amortized cost	0.0	0.0
Fair value	391.0	1,661.0
Investment securities - equity	0.0	0.0
A+ to A-
Schedule of Held-to-Maturity Securities [Line Items]
Amortized cost	0.0	0.0
Fair value	467.0	528.0
Investment securities - equity	0.0	0.0
BBB+ to BBB-
Schedule of Held-to-Maturity Securities [Line Items]
Amortized cost	0.0	0.0
Fair value	271.0	239.0
Investment securities - equity	55.0	54.0
BB+ and below
Schedule of Held-to-Maturity Securities [Line Items]
Amortized cost	0.0	0.0
Fair value	53.0	85.0
Investment securities - equity	38.0	35.0
Unrated
Schedule of Held-to-Maturity Securities [Line Items]
Amortized cost	1,461.0	1,429.0
Fair value	106.0	103.0
Investment securities - equity	12.0	11.0
Tax-exempt
Schedule of Held-to-Maturity Securities [Line Items]
Amortized cost	1,278.0	1,243.0
Fair value	849.0	858.0
Tax-exempt | AAA
Schedule of Held-to-Maturity Securities [Line Items]
Amortized cost	0.0	0.0
Fair value	9.0	9.0
Tax-exempt | Split-rated AAA/AA+
Schedule of Held-to-Maturity Securities [Line Items]
Amortized cost	0.0	0.0
Fair value	15.0	16.0
Tax-exempt | AA+ to AA-
Schedule of Held-to-Maturity Securities [Line Items]
Amortized cost	0.0	0.0
Fair value	356.0	361.0
Tax-exempt | A+ to A-
Schedule of Held-to-Maturity Securities [Line Items]
Amortized cost	0.0	0.0
Fair value	380.0	386.0
Tax-exempt | BBB+ to BBB-
Schedule of Held-to-Maturity Securities [Line Items]
Amortized cost	0.0	0.0
Fair value	0.0	0.0
Tax-exempt | BB+ and below
Schedule of Held-to-Maturity Securities [Line Items]
Amortized cost	0.0	0.0
Fair value	0.0	0.0
Tax-exempt | Unrated
Schedule of Held-to-Maturity Securities [Line Items]
Amortized cost	1,278.0	1,243.0
Fair value	89.0	86.0
Private label residential MBS
Schedule of Held-to-Maturity Securities [Line Items]
Amortized cost	183.0	186.0
Fair value	1,091.0	1,117.0
Private label residential MBS | AAA
Schedule of Held-to-Maturity Securities [Line Items]
Amortized cost	0.0	0.0
Fair value	1,064.0	1,090.0
Private label residential MBS | Split-rated AAA/AA+
Schedule of Held-to-Maturity Securities [Line Items]
Amortized cost	0.0	0.0
Fair value	0.0	0.0
Private label residential MBS | AA+ to AA-
Schedule of Held-to-Maturity Securities [Line Items]
Amortized cost	0.0	0.0
Fair value	26.0	26.0
Private label residential MBS | A+ to A-
Schedule of Held-to-Maturity Securities [Line Items]
Amortized cost	0.0	0.0
Fair value	0.0	0.0
Private label residential MBS | BBB+ to BBB-
Schedule of Held-to-Maturity Securities [Line Items]
Amortized cost	0.0	0.0
Fair value	0.0	0.0
Private label residential MBS | BB+ and below
Schedule of Held-to-Maturity Securities [Line Items]
Amortized cost	0.0	0.0
Fair value	1.0	1.0
Private label residential MBS | Unrated
Schedule of Held-to-Maturity Securities [Line Items]
Amortized cost	183.0	186.0
Fair value	0.0	0.0
U.S. Treasury securities
Schedule of Held-to-Maturity Securities [Line Items]
Fair value	7,011.0	4,853.0
U.S. Treasury securities | AAA
Schedule of Held-to-Maturity Securities [Line Items]
Fair value	0.0	0.0
U.S. Treasury securities | Split-rated AAA/AA+
Schedule of Held-to-Maturity Securities [Line Items]
Fair value	7,011.0	4,853.0
U.S. Treasury securities | AA+ to AA-
Schedule of Held-to-Maturity Securities [Line Items]
Fair value	0.0	0.0
U.S. Treasury securities | A+ to A-
Schedule of Held-to-Maturity Securities [Line Items]
Fair value	0.0	0.0
U.S. Treasury securities | BBB+ to BBB-
Schedule of Held-to-Maturity Securities [Line Items]
Fair value	0.0	0.0
U.S. Treasury securities | BB+ and below
Schedule of Held-to-Maturity Securities [Line Items]
Fair value	0.0	0.0
U.S. Treasury securities | Unrated
Schedule of Held-to-Maturity Securities [Line Items]
Fair value	0.0	0.0
Residential MBS issued by GSEs
Schedule of Held-to-Maturity Securities [Line Items]
Fair value	4,536.0	1,972.0
Residential MBS issued by GSEs | AAA
Schedule of Held-to-Maturity Securities [Line Items]
Fair value	0.0	0.0
Residential MBS issued by GSEs | Split-rated AAA/AA+
Schedule of Held-to-Maturity Securities [Line Items]
Fair value	4,536.0	1,972.0
Residential MBS issued by GSEs | AA+ to AA-
Schedule of Held-to-Maturity Securities [Line Items]
Fair value	0.0	0.0
Residential MBS issued by GSEs | A+ to A-
Schedule of Held-to-Maturity Securities [Line Items]
Fair value	0.0	0.0
Residential MBS issued by GSEs | BBB+ to BBB-
Schedule of Held-to-Maturity Securities [Line Items]
Fair value	0.0	0.0
Residential MBS issued by GSEs | BB+ and below
Schedule of Held-to-Maturity Securities [Line Items]
Fair value	0.0	0.0
Residential MBS issued by GSEs | Unrated
Schedule of Held-to-Maturity Securities [Line Items]
Fair value	0.0	0.0
Commercial MBS issued by GSEs
Schedule of Held-to-Maturity Securities [Line Items]
Fair value	586.0	530.0
Commercial MBS issued by GSEs | AAA
Schedule of Held-to-Maturity Securities [Line Items]
Fair value	0.0	0.0
Commercial MBS issued by GSEs | Split-rated AAA/AA+
Schedule of Held-to-Maturity Securities [Line Items]
Fair value	586.0	530.0
Commercial MBS issued by GSEs | AA+ to AA-
Schedule of Held-to-Maturity Securities [Line Items]
Fair value	0.0	0.0
Commercial MBS issued by GSEs | A+ to A-
Schedule of Held-to-Maturity Securities [Line Items]
Fair value	0.0	0.0
Commercial MBS issued by GSEs | BBB+ to BBB-
Schedule of Held-to-Maturity Securities [Line Items]
Fair value	0.0	0.0
Commercial MBS issued by GSEs | BB+ and below
Schedule of Held-to-Maturity Securities [Line Items]
Fair value	0.0	0.0
Commercial MBS issued by GSEs | Unrated
Schedule of Held-to-Maturity Securities [Line Items]
Fair value	0.0	0.0
Corporate debt securities
Schedule of Held-to-Maturity Securities [Line Items]
Fair value	367.0	367.0
Corporate debt securities | AAA
Schedule of Held-to-Maturity Securities [Line Items]
Fair value	0.0	0.0
Corporate debt securities | Split-rated AAA/AA+
Schedule of Held-to-Maturity Securities [Line Items]
Fair value	0.0	0.0
Corporate debt securities | AA+ to AA-
Schedule of Held-to-Maturity Securities [Line Items]
Fair value	0.0	0.0
Corporate debt securities | A+ to A-
Schedule of Held-to-Maturity Securities [Line Items]
Fair value	76.0	76.0
Corporate debt securities | BBB+ to BBB-
Schedule of Held-to-Maturity Securities [Line Items]
Fair value	242.0	211.0
Corporate debt securities | BB+ and below
Schedule of Held-to-Maturity Securities [Line Items]
Fair value	49.0	80.0
Corporate debt securities | Unrated
Schedule of Held-to-Maturity Securities [Line Items]
Fair value	0.0	0.0
Other
Schedule of Held-to-Maturity Securities [Line Items]
Fair value	69.0	69.0
Other | AAA
Schedule of Held-to-Maturity Securities [Line Items]
Fair value	0.0	0.0
Other | Split-rated AAA/AA+
Schedule of Held-to-Maturity Securities [Line Items]
Fair value	0.0	0.0
Other | AA+ to AA-
Schedule of Held-to-Maturity Securities [Line Items]
Fair value	9.0	9.0
Other | A+ to A-
Schedule of Held-to-Maturity Securities [Line Items]
Fair value	11.0	11.0
Other | BBB+ to BBB-
Schedule of Held-to-Maturity Securities [Line Items]
Fair value	29.0	28.0
Other | BB+ and below
Schedule of Held-to-Maturity Securities [Line Items]
Fair value	3.0	4.0
Other | Unrated
Schedule of Held-to-Maturity Securities [Line Items]
Fair value	17.0	17.0
Preferred Stock
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities - equity	105.0	100.0
Preferred Stock | AAA
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities - equity	0.0	0.0
Preferred Stock | Split-rated AAA/AA+
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities - equity	0.0	0.0
Preferred Stock | AA+ to AA-
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities - equity	0.0	0.0
Preferred Stock | A+ to A-
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities - equity	0.0	0.0
Preferred Stock | BBB+ to BBB-
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities - equity	55.0	54.0
Preferred Stock | BB+ and below
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities - equity	38.0	35.0
Preferred Stock | Unrated
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities - equity	12.0	11.0
CRA investments
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities - equity	25.0	26.0
CRA investments | AAA
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities - equity	0.0	0.0
CRA investments | Split-rated AAA/AA+
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities - equity	25.0	26.0
CRA investments | AA+ to AA-
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities - equity	0.0	0.0
CRA investments | A+ to A-
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities - equity	0.0	0.0
CRA investments | BBB+ to BBB-
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities - equity	0.0	0.0
CRA investments | BB+ and below
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities - equity	0.0	0.0
CRA investments | Unrated
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities - equity	$ 0.0	0.0
CLO
Schedule of Held-to-Maturity Securities [Line Items]
Fair value		1,399.0
CLO | AAA
Schedule of Held-to-Maturity Securities [Line Items]
Fair value		79.0
CLO | Split-rated AAA/AA+
Schedule of Held-to-Maturity Securities [Line Items]
Fair value		0.0
CLO | AA+ to AA-
Schedule of Held-to-Maturity Securities [Line Items]
Fair value		1,265.0
CLO | A+ to A-
Schedule of Held-to-Maturity Securities [Line Items]
Fair value		55.0
CLO | BBB+ to BBB-
Schedule of Held-to-Maturity Securities [Line Items]
Fair value		0.0
CLO | BB+ and below
Schedule of Held-to-Maturity Securities [Line Items]
Fair value		0.0
CLO | Unrated
Schedule of Held-to-Maturity Securities [Line Items]
Fair value		$ 0.0

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Investment Securities - Amortized Cost and Fair Value of Investment Securities by Contractual Maturities (Detail) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Amortized Cost
Securities held to maturity, Due in one year or less, Amortized Cost	$ 29
Securities held to maturity, After one year through five years, Amortized Cost	8
Securities held to maturity, After five years through ten years, Amortized Cost	86
Securities held to maturity, After ten years, Amortized Cost	1,155
Securities held to maturity, Mortgage backed securities, Amortized Cost	183
Amortized cost	1,461	$ 1,429
Held-to-maturity
Securities held to maturity, Due in one year or less, Estimated Fair Value	29
Securities held to maturity, After one year through five years, Estimated Fair Value	8
Securities held to maturity, After five years through ten years, Estimated Fair Value	74
Securities held to maturity, After ten years, Estimated Fair Value	998
Debt securities, held to maturity, Mortgage backed securities, Estimated Fair Value	144
Investment securities - HTM, fair value	1,253	1,251
Amortized Cost
Securities available for sale, Due in one year or less, Amortized Cost	6,540
Securities available for sale, After one year through five years, Amortized Cost	646
Securities available for sale, After five years through ten years, Amortized Cost	278
Securities available for sale, After ten years, Amortized Cost	967
Securities available for sale, Mortgage backed securities, Amortized Cost	6,820
Securities available for sale Total, Amortized Cost	15,251
Estimated Fair Value
Securities available for sale, Due in one year or less, Estimated Fair Value	6,535
Securities available for sale, After one year through five years, Estimated Fair Value	634
Securities available for sale, After five years through ten years, Estimated Fair Value	242
Securities available for sale, After ten years, Estimated Fair Value	885
Securities available for sale, Mortgage backed securities, Estimated Fair Value	6,213
Securities available for sale Total, Estimated Fair Value	$ 14,509	$ 11,165

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Investment Securities - Gross Gains and (Losses) on Sales of Investments (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Investment securities - AFS
Gross gains	$ 0.9	$ 3.4
Gross losses	(1.8)	(15.9)
Net losses on AFS securities	$ (0.9)	$ (12.5)

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Loans Held For Sale - Summary of Loans HFS by Type (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans HFS	$ 1,841	$ 1,402
Total government-insured or guaranteed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans HFS	764	500
EBO
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans HFS	0	2
Non-EBO
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans HFS	764	498
Agency-conforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans HFS	1,067	899
Non-agency
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans HFS	$ 10	$ 3

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Loans Held For Sale - Summary of Net Gain on Loan Purchase, Origination and Sale Activities on Residential Mortgage Loans (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Receivables [Abstract]
Mortgage servicing rights capitalized upon sale of loans	$ 188.7	$ 142.4
Net proceeds from sale of loans	(160.7)	(107.4)
Provision for and change in estimate of liability for losses under representations and warranties, net	3.2	2.4
Change in fair value	(6.7)	6.6
Unrealized gain (loss) on derivatives	15.3	(22.2)
Realized gain on derivatives	(8.1)	(2.4)
Total change in fair value of derivatives	7.2	(24.6)
Net gain on residential mortgage loans HFS	31.7	19.4
Loan acquisition and origination fees	13.6	12.0
Net gain on loan origination and sale activities	$ 45.3	$ 31.4

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Loans, Leases and Allowance for Credit Losses - Schedule of Held for Investment Loan Portfolio Composition of Loans, Leases and Allowance for Credit Losses (Detail) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans HFI, net of deferred fees and costs	$ 50,700.0	$ 50,297.0
Less: allowance for credit losses	(340.3)	(336.7)	$ (304.7)	$ (309.7)
Net loans HFI	50,360.0	49,960.0
Warehouse lending
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans HFI, net of deferred fees and costs	6,915.0	6,618.0
Less: allowance for credit losses	(7.3)	(5.8)	(6.6)	(8.4)
Municipal & nonprofit
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans HFI, net of deferred fees and costs	1,622.0	1,554.0
Less: allowance for credit losses	(13.9)	(14.7)	(18.4)	(15.9)
Tech & innovation
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans HFI, net of deferred fees and costs	2,941.0	2,808.0
Less: allowance for credit losses	(48.0)	(42.1)	(36.4)	(30.8)
Equity fund resources
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans HFI, net of deferred fees and costs	695.0	845.0
Less: allowance for credit losses	(1.2)	(1.3)	(3.3)	(6.4)
Other commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans HFI, net of deferred fees and costs	7,754.0	7,452.0
Less: allowance for credit losses	(67.1)	(81.4)	(51.1)	(85.9)
CRE - owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans HFI, net of deferred fees and costs	1,707.0	1,658.0
Less: allowance for credit losses	(6.2)	(6.0)	(8.6)	(7.1)
Hotel franchise finance
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans HFI, net of deferred fees and costs	3,556.0	3,855.0
Less: allowance for credit losses	(35.8)	(33.4)	(47.7)	(46.9)
Other CRE - non-owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans HFI, net of deferred fees and costs	6,365.0	5,974.0
Less: allowance for credit losses	(104.7)	(96.0)	(66.4)	(47.4)
Residential
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans HFI, net of deferred fees and costs	13,078.0	13,287.0
Less: allowance for credit losses	(22.1)	(23.1)	(31.7)	(30.4)
Residential - EBO
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans HFI, net of deferred fees and costs	1,171.0	1,223.0
Less: allowance for credit losses	0.0	0.0	0.0	0.0
Construction and land development
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans HFI, net of deferred fees and costs	4,746.0	4,862.0
Less: allowance for credit losses	(31.9)	(30.4)	(31.5)	(27.4)
Other
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans HFI, net of deferred fees and costs	150.0	161.0
Less: allowance for credit losses	$ (2.1)	$ (2.5)	$ (3.0)	$ (3.1)

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Loans, Leases and Allowance for Credit Losses - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, unamortized loan fees	$ (102.0)		$ (108.0)
Financing receivable, unamortized premium	175.0		177.0
Loans Past Due 90 Days or More and Still Accruing	355.0		441.0
Interest income associated with loans on nonaccrual status	4.9	$ 0.8
Modified loans current with contractual payments	129.0		95.0
Modified loans on nonaccrual status	129.0		111.0
Amortized cost basis	108.0	26.0
Interest receivable	278.0		281.0
Loan purchases	389.0	511.0
Loan sales	148.0	915.0
Transfers of loans HFI to HFS, net of fair value loss adjustment (1)		6,900.0
Charge-off	1.4
Net gain on residential mortgage loans HFS	31.7	19.4
Gain (loss) on sale of loan	(4.9)	(140.8)
Residential - EBO
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans Past Due 90 Days or More and Still Accruing	349.0		399.0
Amortized cost basis	90.0	$ 57.0
Interest receivable	3.0		4.0
Residential - EBO | Financial Asset, Current to 89 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Modified loans	38.0		26.0
Residential - EBO | Over 90 days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Modified loans	$ 12.0		$ 12.0

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Loans, Leases and Allowance for Credit Losses - Summary of Recorded Investment in Nonaccrual Loans and Loans Past Due 90 Days Still Accruing Interest by Loan Class (Detail) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No Allowance for Credit Loss	$ 251.0	$ 151.0
Nonaccrual with an Allowance for Credit Loss	148.0	122.0
Total Nonaccrual	399.0	273.0
Loans Past Due 90 Days or More and Still Accruing	355.0	441.0
Municipal & nonprofit
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No Allowance for Credit Loss	0.0	0.0
Nonaccrual with an Allowance for Credit Loss	5.0	6.0
Total Nonaccrual	5.0	6.0
Loans Past Due 90 Days or More and Still Accruing	0.0	0.0
Tech & innovation
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No Allowance for Credit Loss	34.0	23.0
Nonaccrual with an Allowance for Credit Loss	28.0	10.0
Total Nonaccrual	62.0	33.0
Loans Past Due 90 Days or More and Still Accruing	0.0	0.0
Other commercial and industrial
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No Allowance for Credit Loss	15.0	19.0
Nonaccrual with an Allowance for Credit Loss	20.0	34.0
Total Nonaccrual	35.0	53.0
Loans Past Due 90 Days or More and Still Accruing	6.0	0.0
CRE - owner occupied
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No Allowance for Credit Loss	8.0	8.0
Nonaccrual with an Allowance for Credit Loss	2.0	1.0
Total Nonaccrual	10.0	9.0
Loans Past Due 90 Days or More and Still Accruing	0.0	0.0
Hotel franchise finance
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No Allowance for Credit Loss	0.0
Nonaccrual with an Allowance for Credit Loss	12.0
Total Nonaccrual	12.0
Loans Past Due 90 Days or More and Still Accruing	0.0
Other CRE - non-owner occupied
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No Allowance for Credit Loss	174.0	82.0
Nonaccrual with an Allowance for Credit Loss	1.0	1.0
Total Nonaccrual	175.0	83.0
Loans Past Due 90 Days or More and Still Accruing	0.0	0.0
Residential
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No Allowance for Credit Loss	0.0	0.0
Nonaccrual with an Allowance for Credit Loss	79.0	70.0
Total Nonaccrual	79.0	70.0
Loans Past Due 90 Days or More and Still Accruing	0.0	0.0
Residential - EBO
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No Allowance for Credit Loss	0.0	0.0
Nonaccrual with an Allowance for Credit Loss	0.0	0.0
Total Nonaccrual	0.0	0.0
Loans Past Due 90 Days or More and Still Accruing	349.0	399.0
Construction and land development
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No Allowance for Credit Loss	19.0	19.0
Nonaccrual with an Allowance for Credit Loss	1.0	0.0
Total Nonaccrual	20.0	19.0
Loans Past Due 90 Days or More and Still Accruing	0.0	$ 42.0
Other
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No Allowance for Credit Loss	1.0
Nonaccrual with an Allowance for Credit Loss	0.0
Total Nonaccrual	1.0
Loans Past Due 90 Days or More and Still Accruing	$ 0.0

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Loans, Leases and Allowance for Credit Losses - Contractual Aging of Loan Portfolio by Segment (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	$ 50,700.0		$ 50,297.0
Current fiscal year, writeoff	0.0	$ 1.8
Year before current fiscal year, writeoff	0.0	0.1
Two years before current fiscal year, writeoff	0.1	5.9
Three years before current fiscal year, writeoff	8.4	1.2
Four years before current fiscal year, writeoff	0.0	0.0
Five years before current fiscal year, writeoff	1.6	0.1
Revolving Loans Amortized Cost Basis, Writeoff	0.1	0.1
Charge-offs	10.2	9.2
Current fiscal year	1,654.0		7,504.0
Year before current fiscal year	6,985.0		12,434.0
Two years before current fiscal year	12,184.0		11,544.0
Three years before current fiscal year	11,176.0		2,876.0
Four years before current fiscal year	2,751.0		1,568.0
Five or more years before current fiscal year	3,762.0		2,523.0
Revolving Loans Amortized Cost Basis	12,234.0		11,829.0
Classified
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	760.0		652.0
Current fiscal year	1.0		72.0
Year before current fiscal year	201.0		131.0
Two years before current fiscal year	126.0		238.0
Three years before current fiscal year	201.0		65.0
Four years before current fiscal year	65.0		72.0
Five or more years before current fiscal year	124.0		66.0
Revolving Loans Amortized Cost Basis	42.0		8.0
Warehouse lending
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	6,915.0		6,618.0
Current fiscal year, writeoff	0.0	0.0
Year before current fiscal year, writeoff	0.0	0.0
Two years before current fiscal year, writeoff	0.0	0.0
Three years before current fiscal year, writeoff	0.0	0.0
Four years before current fiscal year, writeoff	0.0	0.0
Five years before current fiscal year, writeoff	0.0	0.0
Revolving Loans Amortized Cost Basis, Writeoff	0.0	0.0
Charge-offs	0.0	0.0
Current fiscal year	17.0		582.0
Year before current fiscal year	550.0		323.0
Two years before current fiscal year	361.0		7.0
Three years before current fiscal year	7.0		289.0
Four years before current fiscal year	285.0		0.0
Five or more years before current fiscal year	0.0		0.0
Revolving Loans Amortized Cost Basis	5,695.0		5,417.0
Warehouse lending | Classified
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	0.0		0.0
Current fiscal year	0.0		0.0
Year before current fiscal year	0.0		0.0
Two years before current fiscal year	0.0		0.0
Three years before current fiscal year	0.0		0.0
Four years before current fiscal year	0.0		0.0
Five or more years before current fiscal year	0.0		0.0
Revolving Loans Amortized Cost Basis	0.0		0.0
Municipal & nonprofit
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	1,622.0		1,554.0
Current fiscal year, writeoff	0.0	0.0
Year before current fiscal year, writeoff	0.0	0.0
Two years before current fiscal year, writeoff	0.0	0.0
Three years before current fiscal year, writeoff	0.0	0.0
Four years before current fiscal year, writeoff	0.0	0.0
Five years before current fiscal year, writeoff	0.0	0.0
Revolving Loans Amortized Cost Basis, Writeoff	0.0	0.0
Charge-offs	0.0	0.0
Current fiscal year	59.0		102.0
Year before current fiscal year	113.0		174.0
Two years before current fiscal year	207.0		176.0
Three years before current fiscal year	166.0		180.0
Four years before current fiscal year	179.0		74.0
Five or more years before current fiscal year	898.0		848.0
Revolving Loans Amortized Cost Basis	0.0		0.0
Municipal & nonprofit | Classified
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	5.0		6.0
Current fiscal year	0.0		0.0
Year before current fiscal year	0.0		0.0
Two years before current fiscal year	0.0		0.0
Three years before current fiscal year	0.0		0.0
Four years before current fiscal year	0.0		6.0
Five or more years before current fiscal year	5.0		0.0
Revolving Loans Amortized Cost Basis	0.0		0.0
Tech & innovation
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	2,941.0		2,808.0
Current fiscal year, writeoff	0.0	1.8
Year before current fiscal year, writeoff	0.0	0.0
Two years before current fiscal year, writeoff	0.0	0.0
Three years before current fiscal year, writeoff	0.0	0.0
Four years before current fiscal year, writeoff	0.0	0.0
Five years before current fiscal year, writeoff	0.0	0.0
Revolving Loans Amortized Cost Basis, Writeoff	0.0	0.0
Charge-offs	0.0	1.8
Current fiscal year	256.0		778.0
Year before current fiscal year	778.0		856.0
Two years before current fiscal year	730.0		219.0
Three years before current fiscal year	182.0		27.0
Four years before current fiscal year	30.0		66.0
Five or more years before current fiscal year	101.0		38.0
Revolving Loans Amortized Cost Basis	864.0		824.0
Tech & innovation | Classified
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	110.0		80.0
Current fiscal year	0.0		15.0
Year before current fiscal year	13.0		52.0
Two years before current fiscal year	50.0		1.0
Three years before current fiscal year	1.0		5.0
Four years before current fiscal year	5.0		0.0
Five or more years before current fiscal year	0.0		0.0
Revolving Loans Amortized Cost Basis	41.0		7.0
Equity fund resources
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	695.0		845.0
Current fiscal year, writeoff	0.0	0.0
Year before current fiscal year, writeoff	0.0	0.0
Two years before current fiscal year, writeoff	0.0	0.0
Three years before current fiscal year, writeoff	0.0	0.0
Four years before current fiscal year, writeoff	0.0	0.0
Five years before current fiscal year, writeoff	0.0	0.0
Revolving Loans Amortized Cost Basis, Writeoff	0.0	0.0
Charge-offs	0.0	0.0
Current fiscal year	19.0		154.0
Year before current fiscal year	78.0		62.0
Two years before current fiscal year	92.0		21.0
Three years before current fiscal year	40.0		3.0
Four years before current fiscal year	3.0		1.0
Five or more years before current fiscal year	0.0		0.0
Revolving Loans Amortized Cost Basis	463.0		604.0
Equity fund resources | Classified
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	1.0		0.0
Current fiscal year	0.0		0.0
Year before current fiscal year	0.0		0.0
Two years before current fiscal year	0.0		0.0
Three years before current fiscal year	0.0		0.0
Four years before current fiscal year	1.0		0.0
Five or more years before current fiscal year	0.0		0.0
Revolving Loans Amortized Cost Basis	0.0		0.0
Other commercial and industrial
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	7,754.0		7,452.0
Current fiscal year, writeoff	0.0	0.0
Year before current fiscal year, writeoff	0.0	0.0
Two years before current fiscal year, writeoff	0.1	5.9
Three years before current fiscal year, writeoff	2.0	1.2
Four years before current fiscal year, writeoff	0.0	0.0
Five years before current fiscal year, writeoff	0.1	0.1
Revolving Loans Amortized Cost Basis, Writeoff	0.1	0.1
Charge-offs	2.3	7.3
Current fiscal year	571.0		1,701.0
Year before current fiscal year	1,621.0		1,480.0
Two years before current fiscal year	1,373.0		619.0
Three years before current fiscal year	551.0		187.0
Four years before current fiscal year	154.0		81.0
Five or more years before current fiscal year	241.0		196.0
Revolving Loans Amortized Cost Basis	3,243.0		3,188.0
Other commercial and industrial | Classified
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	167.0		92.0
Current fiscal year	1.0		1.0
Year before current fiscal year	88.0		25.0
Two years before current fiscal year	24.0		59.0
Three years before current fiscal year	48.0		2.0
Four years before current fiscal year	1.0		4.0
Five or more years before current fiscal year	4.0		0.0
Revolving Loans Amortized Cost Basis	1.0		1.0
CRE - owner occupied
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	1,707.0		1,658.0
Current fiscal year, writeoff	0.0	0.0
Year before current fiscal year, writeoff	0.0	0.0
Two years before current fiscal year, writeoff	0.0	0.0
Three years before current fiscal year, writeoff	0.0	0.0
Four years before current fiscal year, writeoff	0.0	0.0
Five years before current fiscal year, writeoff	0.0	0.0
Revolving Loans Amortized Cost Basis, Writeoff	0.0	0.0
Charge-offs	0.0	0.0
Current fiscal year	35.0		167.0
Year before current fiscal year	182.0		345.0
Two years before current fiscal year	380.0		326.0
Three years before current fiscal year	324.0		164.0
Four years before current fiscal year	156.0		133.0
Five or more years before current fiscal year	590.0		483.0
Revolving Loans Amortized Cost Basis	40.0		40.0
CRE - owner occupied | Classified
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	47.0		47.0
Current fiscal year	0.0		2.0
Year before current fiscal year	2.0		1.0
Two years before current fiscal year	1.0		4.0
Three years before current fiscal year	4.0		1.0
Four years before current fiscal year	1.0		1.0
Five or more years before current fiscal year	39.0		38.0
Revolving Loans Amortized Cost Basis	0.0		0.0
Hotel franchise finance
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	3,556.0		3,855.0
Current fiscal year, writeoff	0.0	0.0
Year before current fiscal year, writeoff	0.0	0.0
Two years before current fiscal year, writeoff	0.0	0.0
Three years before current fiscal year, writeoff	1.4	0.0
Four years before current fiscal year, writeoff	0.0	0.0
Five years before current fiscal year, writeoff	1.5	0.0
Revolving Loans Amortized Cost Basis, Writeoff	0.0	0.0
Charge-offs	2.9	0.0
Current fiscal year	97.0		651.0
Year before current fiscal year	597.0		1,543.0
Two years before current fiscal year	1,449.0		680.0
Three years before current fiscal year	561.0		95.0
Four years before current fiscal year	94.0		497.0
Five or more years before current fiscal year	626.0		257.0
Revolving Loans Amortized Cost Basis	132.0		132.0
Hotel franchise finance | Classified
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	75.0		147.0
Current fiscal year	0.0		24.0
Year before current fiscal year	0.0		8.0
Two years before current fiscal year	0.0		48.0
Three years before current fiscal year	20.0		0.0
Four years before current fiscal year	0.0		43.0
Five or more years before current fiscal year	55.0		24.0
Revolving Loans Amortized Cost Basis	0.0		0.0
Other CRE - non-owner occupied
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	6,365.0		5,974.0
Current fiscal year, writeoff	0.0	0.0
Year before current fiscal year, writeoff	0.0	0.0
Two years before current fiscal year, writeoff	0.0	0.0
Three years before current fiscal year, writeoff	5.0	0.0
Four years before current fiscal year, writeoff	0.0	0.0
Five years before current fiscal year, writeoff	0.0	0.0
Revolving Loans Amortized Cost Basis, Writeoff	0.0	0.0
Charge-offs	5.0	0.0
Current fiscal year	452.0		2,024.0
Year before current fiscal year	1,870.0		1,784.0
Two years before current fiscal year	1,911.0		863.0
Three years before current fiscal year	873.0		501.0
Four years before current fiscal year	454.0		208.0
Five or more years before current fiscal year	359.0		207.0
Revolving Loans Amortized Cost Basis	446.0		387.0
Other CRE - non-owner occupied | Classified
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	205.0		137.0
Current fiscal year	0.0		28.0
Year before current fiscal year	98.0		0.0
Two years before current fiscal year	0.0		93.0
Three years before current fiscal year	93.0		1.0
Four years before current fiscal year	1.0		14.0
Five or more years before current fiscal year	13.0		1.0
Revolving Loans Amortized Cost Basis	0.0		0.0
Residential
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	13,078.0		13,287.0
Current fiscal year, writeoff	0.0	0.0
Year before current fiscal year, writeoff	0.0	0.0
Two years before current fiscal year, writeoff	0.0	0.0
Three years before current fiscal year, writeoff	0.0	0.0
Four years before current fiscal year, writeoff	0.0	0.0
Five years before current fiscal year, writeoff	0.0	0.0
Revolving Loans Amortized Cost Basis, Writeoff	0.0	0.0
Charge-offs	0.0	0.0
Current fiscal year	78.0		325.0
Year before current fiscal year	278.0		3,599.0
Two years before current fiscal year	3,545.0		8,018.0
Three years before current fiscal year	7,925.0		823.0
Four years before current fiscal year	810.0		274.0
Five or more years before current fiscal year	465.0		209.0
Revolving Loans Amortized Cost Basis	23.0		20.0
Residential | Classified
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	79.0		70.0
Current fiscal year	0.0		1.0
Year before current fiscal year	0.0		26.0
Two years before current fiscal year	32.0		33.0
Three years before current fiscal year	35.0		4.0
Four years before current fiscal year	5.0		4.0
Five or more years before current fiscal year	7.0		2.0
Revolving Loans Amortized Cost Basis	0.0		0.0
Residential - EBO
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	1,171.0		1,223.0
Current fiscal year, writeoff	0.0	0.0
Year before current fiscal year, writeoff	0.0	0.0
Two years before current fiscal year, writeoff	0.0	0.0
Three years before current fiscal year, writeoff	0.0	0.0
Four years before current fiscal year, writeoff	0.0	0.0
Five years before current fiscal year, writeoff	0.0	0.0
Revolving Loans Amortized Cost Basis, Writeoff	0.0	0.0
Charge-offs	0.0	0.0
Current fiscal year	0.0		2.0
Year before current fiscal year	11.0		8.0
Two years before current fiscal year	17.0		227.0
Three years before current fiscal year	220.0		534.0
Four years before current fiscal year	513.0		231.0
Five or more years before current fiscal year	410.0		221.0
Revolving Loans Amortized Cost Basis	0.0		0.0
Residential - EBO | Classified
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	0.0		0.0
Current fiscal year	0.0		0.0
Year before current fiscal year	0.0		0.0
Two years before current fiscal year	0.0		0.0
Three years before current fiscal year	0.0		0.0
Four years before current fiscal year	0.0		0.0
Five or more years before current fiscal year	0.0		0.0
Revolving Loans Amortized Cost Basis	0.0		0.0
Construction and land development
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	4,746.0		4,862.0
Current fiscal year, writeoff	0.0	0.0
Year before current fiscal year, writeoff	0.0	0.0
Two years before current fiscal year, writeoff	0.0	0.0
Three years before current fiscal year, writeoff	0.0	0.0
Four years before current fiscal year, writeoff	0.0	0.0
Five years before current fiscal year, writeoff	0.0	0.0
Revolving Loans Amortized Cost Basis, Writeoff	0.0	0.0
Charge-offs	0.0	0.0
Current fiscal year	68.0		1,014.0
Year before current fiscal year	906.0		2,250.0
Two years before current fiscal year	2,109.0		385.0
Three years before current fiscal year	325.0		62.0
Four years before current fiscal year	62.0		0.0
Five or more years before current fiscal year	0.0		0.0
Revolving Loans Amortized Cost Basis	1,276.0		1,151.0
Construction and land development | Classified
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	70.0		72.0
Current fiscal year	0.0		1.0
Year before current fiscal year	0.0		19.0
Two years before current fiscal year	19.0		0.0
Three years before current fiscal year	0.0		52.0
Four years before current fiscal year	51.0		0.0
Five or more years before current fiscal year	0.0		0.0
Revolving Loans Amortized Cost Basis	0.0		0.0
Other
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	150.0		161.0
Current fiscal year, writeoff	0.0	0.0
Year before current fiscal year, writeoff	0.0	0.1
Two years before current fiscal year, writeoff	0.0	0.0
Three years before current fiscal year, writeoff	0.0	0.0
Four years before current fiscal year, writeoff	0.0	0.0
Five years before current fiscal year, writeoff	0.0	0.0
Revolving Loans Amortized Cost Basis, Writeoff	0.0	0.0
Charge-offs	0.0	$ 0.1
Current fiscal year	2.0		4.0
Year before current fiscal year	1.0		10.0
Two years before current fiscal year	10.0		3.0
Three years before current fiscal year	2.0		11.0
Four years before current fiscal year	11.0		3.0
Five or more years before current fiscal year	72.0		64.0
Revolving Loans Amortized Cost Basis	52.0		66.0
Other | Classified
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	1.0		1.0
Current fiscal year	0.0		0.0
Year before current fiscal year	0.0		0.0
Two years before current fiscal year	0.0		0.0
Three years before current fiscal year	0.0		0.0
Four years before current fiscal year	0.0		0.0
Five or more years before current fiscal year	1.0		1.0
Revolving Loans Amortized Cost Basis	0.0		0.0
Current
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	50,005.0		49,413.0
Current | Warehouse lending
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	6,915.0		6,618.0
Current | Municipal & nonprofit
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	1,622.0		1,554.0
Current | Tech & innovation
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	2,941.0		2,808.0
Current | Equity fund resources
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	695.0		845.0
Current | Other commercial and industrial
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	7,743.0		7,439.0
Current | CRE - owner occupied
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	1,706.0		1,627.0
Current | Hotel franchise finance
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	3,556.0		3,824.0
Current | Other CRE - non-owner occupied
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	6,339.0		5,974.0
Current | Residential
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	13,002.0		13,199.0
Current | Residential - EBO
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	598.0		545.0
Current | Construction and land development
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	4,741.0		4,820.0
Current | Other
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	147.0		160.0
30-59 Days Past Due
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	243.0		270.0
30-59 Days Past Due | Warehouse lending
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	0.0		0.0
30-59 Days Past Due | Municipal & nonprofit
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	0.0		0.0
30-59 Days Past Due | Tech & innovation
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	0.0		0.0
30-59 Days Past Due | Equity fund resources
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	0.0		0.0
30-59 Days Past Due | Other commercial and industrial
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	5.0		13.0
30-59 Days Past Due | CRE - owner occupied
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	0.0		0.0
30-59 Days Past Due | Hotel franchise finance
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	0.0		15.0
30-59 Days Past Due | Other CRE - non-owner occupied
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	26.0		0.0
30-59 Days Past Due | Residential
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	66.0		68.0
30-59 Days Past Due | Residential - EBO
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	138.0		173.0
30-59 Days Past Due | Construction and land development
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	5.0		0.0
30-59 Days Past Due | Other
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	3.0		1.0
60-89 Days Past Due
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	97.0		173.0
60-89 Days Past Due | Warehouse lending
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	0.0		0.0
60-89 Days Past Due | Municipal & nonprofit
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	0.0		0.0
60-89 Days Past Due | Tech & innovation
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	0.0		0.0
60-89 Days Past Due | Equity fund resources
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	0.0		0.0
60-89 Days Past Due | Other commercial and industrial
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	0.0		0.0
60-89 Days Past Due | CRE - owner occupied
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	1.0		31.0
60-89 Days Past Due | Hotel franchise finance
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	0.0		16.0
60-89 Days Past Due | Other CRE - non-owner occupied
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	0.0		0.0
60-89 Days Past Due | Residential
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	10.0		20.0
60-89 Days Past Due | Residential - EBO
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	86.0		106.0
60-89 Days Past Due | Construction and land development
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	0.0		0.0
60-89 Days Past Due | Other
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	0.0		0.0
Over 90 days Past Due
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	355.0		441.0
Over 90 days Past Due | Warehouse lending
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	0.0		0.0
Over 90 days Past Due | Municipal & nonprofit
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	0.0		0.0
Over 90 days Past Due | Tech & innovation
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	0.0		0.0
Over 90 days Past Due | Equity fund resources
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	0.0		0.0
Over 90 days Past Due | Other commercial and industrial
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	6.0		0.0
Over 90 days Past Due | CRE - owner occupied
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	0.0		0.0
Over 90 days Past Due | Hotel franchise finance
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	0.0		0.0
Over 90 days Past Due | Other CRE - non-owner occupied
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	0.0		0.0
Over 90 days Past Due | Residential
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	0.0		0.0
Over 90 days Past Due | Residential - EBO
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	349.0		399.0
Over 90 days Past Due | Construction and land development
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	0.0		42.0
Over 90 days Past Due | Other
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	0.0		0.0
Total Past Due
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	695.0		884.0
Total Past Due | Warehouse lending
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	0.0		0.0
Total Past Due | Municipal & nonprofit
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	0.0		0.0
Total Past Due | Tech & innovation
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	0.0		0.0
Total Past Due | Equity fund resources
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	0.0		0.0
Total Past Due | Other commercial and industrial
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	11.0		13.0
Total Past Due | CRE - owner occupied
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	1.0		31.0
Total Past Due | Hotel franchise finance
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	0.0		31.0
Total Past Due | Other CRE - non-owner occupied
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	26.0		0.0
Total Past Due | Residential
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	76.0		88.0
Total Past Due | Residential - EBO
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	573.0		678.0
Total Past Due | Construction and land development
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	5.0		42.0
Total Past Due | Other
Financing Receivable, Nonaccrual [Line Items]
Loans HFI, net of deferred fees and costs	$ 3.0		$ 1.0

XML

Loans, Leases and Allowance for Credit Losses - Credit Quality Indicators (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	$ 1,654.0		$ 7,504.0
Year before current fiscal year	6,985.0		12,434.0
Two years before current fiscal year	12,184.0		11,544.0
Three years before current fiscal year	11,176.0		2,876.0
Four years before current fiscal year	2,751.0		1,568.0
Five or more years before current fiscal year	3,762.0		2,523.0
Revolving Loans Amortized Cost Basis	12,234.0		11,829.0
Cumulative fair value hedging adjustment	(46.0)		19.0
Loans HFI, net of deferred fees and costs	50,700.0		50,297.0
Current fiscal year, writeoff	0.0	$ 1.8
Year before current fiscal year, writeoff	0.0	0.1
Two years before current fiscal year, writeoff	0.1	5.9
Three years before current fiscal year, writeoff	8.4	1.2
Four years before current fiscal year, writeoff	0.0	0.0
Five years before current fiscal year, writeoff	1.6	0.1
Revolving Loans Amortized Cost Basis, Writeoff	0.1	0.1
Charge-offs	10.2	9.2
Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	1,653.0		7,139.0
Year before current fiscal year	6,647.0		12,265.0
Two years before current fiscal year	11,941.0		11,211.0
Three years before current fiscal year	10,898.0		2,757.0
Four years before current fiscal year	2,635.0		1,433.0
Five or more years before current fiscal year	3,634.0		2,387.0
Revolving Loans Amortized Cost Basis	12,184.0		11,793.0
Loans HFI, net of deferred fees and costs	49,592.0		48,985.0
Special mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	0.0		293.0
Year before current fiscal year	137.0		38.0
Two years before current fiscal year	117.0		95.0
Three years before current fiscal year	77.0		54.0
Four years before current fiscal year	51.0		63.0
Five or more years before current fiscal year	4.0		70.0
Revolving Loans Amortized Cost Basis	8.0		28.0
Loans HFI, net of deferred fees and costs	394.0		641.0
Classified
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	1.0		72.0
Year before current fiscal year	201.0		131.0
Two years before current fiscal year	126.0		238.0
Three years before current fiscal year	201.0		65.0
Four years before current fiscal year	65.0		72.0
Five or more years before current fiscal year	124.0		66.0
Revolving Loans Amortized Cost Basis	42.0		8.0
Loans HFI, net of deferred fees and costs	760.0		652.0
Warehouse lending
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	17.0		582.0
Year before current fiscal year	550.0		323.0
Two years before current fiscal year	361.0		7.0
Three years before current fiscal year	7.0		289.0
Four years before current fiscal year	285.0		0.0
Five or more years before current fiscal year	0.0		0.0
Revolving Loans Amortized Cost Basis	5,695.0		5,417.0
Loans HFI, net of deferred fees and costs	6,915.0		6,618.0
Current fiscal year, writeoff	0.0	0.0
Year before current fiscal year, writeoff	0.0	0.0
Two years before current fiscal year, writeoff	0.0	0.0
Three years before current fiscal year, writeoff	0.0	0.0
Four years before current fiscal year, writeoff	0.0	0.0
Five years before current fiscal year, writeoff	0.0	0.0
Revolving Loans Amortized Cost Basis, Writeoff	0.0	0.0
Charge-offs	0.0	0.0
Warehouse lending | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	17.0		582.0
Year before current fiscal year	550.0		323.0
Two years before current fiscal year	338.0		7.0
Three years before current fiscal year	7.0		289.0
Four years before current fiscal year	285.0		0.0
Five or more years before current fiscal year	0.0		0.0
Revolving Loans Amortized Cost Basis	5,695.0		5,391.0
Loans HFI, net of deferred fees and costs	6,892.0		6,592.0
Warehouse lending | Special mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	0.0		0.0
Year before current fiscal year	0.0		0.0
Two years before current fiscal year	23.0		0.0
Three years before current fiscal year	0.0		0.0
Four years before current fiscal year	0.0		0.0
Five or more years before current fiscal year	0.0		0.0
Revolving Loans Amortized Cost Basis	0.0		26.0
Loans HFI, net of deferred fees and costs	23.0		26.0
Warehouse lending | Classified
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	0.0		0.0
Year before current fiscal year	0.0		0.0
Two years before current fiscal year	0.0		0.0
Three years before current fiscal year	0.0		0.0
Four years before current fiscal year	0.0		0.0
Five or more years before current fiscal year	0.0		0.0
Revolving Loans Amortized Cost Basis	0.0		0.0
Loans HFI, net of deferred fees and costs	0.0		0.0
Municipal & nonprofit
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	59.0		102.0
Year before current fiscal year	113.0		174.0
Two years before current fiscal year	207.0		176.0
Three years before current fiscal year	166.0		180.0
Four years before current fiscal year	179.0		74.0
Five or more years before current fiscal year	898.0		848.0
Revolving Loans Amortized Cost Basis	0.0		0.0
Loans HFI, net of deferred fees and costs	1,622.0		1,554.0
Current fiscal year, writeoff	0.0	0.0
Year before current fiscal year, writeoff	0.0	0.0
Two years before current fiscal year, writeoff	0.0	0.0
Three years before current fiscal year, writeoff	0.0	0.0
Four years before current fiscal year, writeoff	0.0	0.0
Five years before current fiscal year, writeoff	0.0	0.0
Revolving Loans Amortized Cost Basis, Writeoff	0.0	0.0
Charge-offs	0.0	0.0
Municipal & nonprofit | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	59.0		102.0
Year before current fiscal year	113.0		167.0
Two years before current fiscal year	200.0		176.0
Three years before current fiscal year	166.0		169.0
Four years before current fiscal year	168.0		68.0
Five or more years before current fiscal year	893.0		848.0
Revolving Loans Amortized Cost Basis	0.0		0.0
Loans HFI, net of deferred fees and costs	1,599.0		1,530.0
Municipal & nonprofit | Special mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	0.0		0.0
Year before current fiscal year	0.0		7.0
Two years before current fiscal year	7.0		0.0
Three years before current fiscal year	0.0		11.0
Four years before current fiscal year	11.0		0.0
Five or more years before current fiscal year	0.0		0.0
Revolving Loans Amortized Cost Basis	0.0		0.0
Loans HFI, net of deferred fees and costs	18.0		18.0
Municipal & nonprofit | Classified
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	0.0		0.0
Year before current fiscal year	0.0		0.0
Two years before current fiscal year	0.0		0.0
Three years before current fiscal year	0.0		0.0
Four years before current fiscal year	0.0		6.0
Five or more years before current fiscal year	5.0		0.0
Revolving Loans Amortized Cost Basis	0.0		0.0
Loans HFI, net of deferred fees and costs	5.0		6.0
Tech & innovation
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	256.0		778.0
Year before current fiscal year	778.0		856.0
Two years before current fiscal year	730.0		219.0
Three years before current fiscal year	182.0		27.0
Four years before current fiscal year	30.0		66.0
Five or more years before current fiscal year	101.0		38.0
Revolving Loans Amortized Cost Basis	864.0		824.0
Loans HFI, net of deferred fees and costs	2,941.0		2,808.0
Current fiscal year, writeoff	0.0	1.8
Year before current fiscal year, writeoff	0.0	0.0
Two years before current fiscal year, writeoff	0.0	0.0
Three years before current fiscal year, writeoff	0.0	0.0
Four years before current fiscal year, writeoff	0.0	0.0
Five years before current fiscal year, writeoff	0.0	0.0
Revolving Loans Amortized Cost Basis, Writeoff	0.0	0.0
Charge-offs	0.0	1.8
Tech & innovation | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	256.0		758.0
Year before current fiscal year	756.0		774.0
Two years before current fiscal year	650.0		206.0
Three years before current fiscal year	171.0		22.0
Four years before current fiscal year	25.0		66.0
Five or more years before current fiscal year	101.0		38.0
Revolving Loans Amortized Cost Basis	815.0		816.0
Loans HFI, net of deferred fees and costs	2,774.0		2,680.0
Tech & innovation | Special mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	0.0		5.0
Year before current fiscal year	9.0		30.0
Two years before current fiscal year	30.0		12.0
Three years before current fiscal year	10.0		0.0
Four years before current fiscal year	0.0		0.0
Five or more years before current fiscal year	0.0		0.0
Revolving Loans Amortized Cost Basis	8.0		1.0
Loans HFI, net of deferred fees and costs	57.0		48.0
Tech & innovation | Classified
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	0.0		15.0
Year before current fiscal year	13.0		52.0
Two years before current fiscal year	50.0		1.0
Three years before current fiscal year	1.0		5.0
Four years before current fiscal year	5.0		0.0
Five or more years before current fiscal year	0.0		0.0
Revolving Loans Amortized Cost Basis	41.0		7.0
Loans HFI, net of deferred fees and costs	110.0		80.0
Equity fund resources
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	19.0		154.0
Year before current fiscal year	78.0		62.0
Two years before current fiscal year	92.0		21.0
Three years before current fiscal year	40.0		3.0
Four years before current fiscal year	3.0		1.0
Five or more years before current fiscal year	0.0		0.0
Revolving Loans Amortized Cost Basis	463.0		604.0
Loans HFI, net of deferred fees and costs	695.0		845.0
Current fiscal year, writeoff	0.0	0.0
Year before current fiscal year, writeoff	0.0	0.0
Two years before current fiscal year, writeoff	0.0	0.0
Three years before current fiscal year, writeoff	0.0	0.0
Four years before current fiscal year, writeoff	0.0	0.0
Five years before current fiscal year, writeoff	0.0	0.0
Revolving Loans Amortized Cost Basis, Writeoff	0.0	0.0
Charge-offs	0.0	0.0
Equity fund resources | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	19.0		154.0
Year before current fiscal year	78.0		62.0
Two years before current fiscal year	92.0		21.0
Three years before current fiscal year	40.0		3.0
Four years before current fiscal year	2.0		1.0
Five or more years before current fiscal year	0.0		0.0
Revolving Loans Amortized Cost Basis	463.0		604.0
Loans HFI, net of deferred fees and costs	694.0		845.0
Equity fund resources | Special mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	0.0		0.0
Year before current fiscal year	0.0		0.0
Two years before current fiscal year	0.0		0.0
Three years before current fiscal year	0.0		0.0
Four years before current fiscal year	0.0		0.0
Five or more years before current fiscal year	0.0		0.0
Revolving Loans Amortized Cost Basis	0.0		0.0
Loans HFI, net of deferred fees and costs	0.0		0.0
Equity fund resources | Classified
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	0.0		0.0
Year before current fiscal year	0.0		0.0
Two years before current fiscal year	0.0		0.0
Three years before current fiscal year	0.0		0.0
Four years before current fiscal year	1.0		0.0
Five or more years before current fiscal year	0.0		0.0
Revolving Loans Amortized Cost Basis	0.0		0.0
Loans HFI, net of deferred fees and costs	1.0		0.0
Other commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	571.0		1,701.0
Year before current fiscal year	1,621.0		1,480.0
Two years before current fiscal year	1,373.0		619.0
Three years before current fiscal year	551.0		187.0
Four years before current fiscal year	154.0		81.0
Five or more years before current fiscal year	241.0		196.0
Revolving Loans Amortized Cost Basis	3,243.0		3,188.0
Loans HFI, net of deferred fees and costs	7,754.0		7,452.0
Current fiscal year, writeoff	0.0	0.0
Year before current fiscal year, writeoff	0.0	0.0
Two years before current fiscal year, writeoff	0.1	5.9
Three years before current fiscal year, writeoff	2.0	1.2
Four years before current fiscal year, writeoff	0.0	0.0
Five years before current fiscal year, writeoff	0.1	0.1
Revolving Loans Amortized Cost Basis, Writeoff	0.1	0.1
Charge-offs	2.3	7.3
Other commercial and industrial | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	570.0		1,610.0
Year before current fiscal year	1,533.0		1,454.0
Two years before current fiscal year	1,348.0		559.0
Three years before current fiscal year	503.0		185.0
Four years before current fiscal year	153.0		77.0
Five or more years before current fiscal year	236.0		196.0
Revolving Loans Amortized Cost Basis	3,242.0		3,186.0
Loans HFI, net of deferred fees and costs	7,585.0		7,267.0
Other commercial and industrial | Special mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	0.0		90.0
Year before current fiscal year	0.0		1.0
Two years before current fiscal year	1.0		1.0
Three years before current fiscal year	0.0		0.0
Four years before current fiscal year	0.0		0.0
Five or more years before current fiscal year	1.0		0.0
Revolving Loans Amortized Cost Basis	0.0		1.0
Loans HFI, net of deferred fees and costs	2.0		93.0
Other commercial and industrial | Classified
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	1.0		1.0
Year before current fiscal year	88.0		25.0
Two years before current fiscal year	24.0		59.0
Three years before current fiscal year	48.0		2.0
Four years before current fiscal year	1.0		4.0
Five or more years before current fiscal year	4.0		0.0
Revolving Loans Amortized Cost Basis	1.0		1.0
Loans HFI, net of deferred fees and costs	167.0		92.0
CRE - owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	35.0		167.0
Year before current fiscal year	182.0		345.0
Two years before current fiscal year	380.0		326.0
Three years before current fiscal year	324.0		164.0
Four years before current fiscal year	156.0		133.0
Five or more years before current fiscal year	590.0		483.0
Revolving Loans Amortized Cost Basis	40.0		40.0
Loans HFI, net of deferred fees and costs	1,707.0		1,658.0
Current fiscal year, writeoff	0.0	0.0
Year before current fiscal year, writeoff	0.0	0.0
Two years before current fiscal year, writeoff	0.0	0.0
Three years before current fiscal year, writeoff	0.0	0.0
Four years before current fiscal year, writeoff	0.0	0.0
Five years before current fiscal year, writeoff	0.0	0.0
Revolving Loans Amortized Cost Basis, Writeoff	0.0	0.0
Charge-offs	0.0	0.0
CRE - owner occupied | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	35.0		165.0
Year before current fiscal year	180.0		344.0
Two years before current fiscal year	377.0		322.0
Three years before current fiscal year	320.0		163.0
Four years before current fiscal year	155.0		132.0
Five or more years before current fiscal year	551.0		444.0
Revolving Loans Amortized Cost Basis	40.0		40.0
Loans HFI, net of deferred fees and costs	1,658.0		1,610.0
CRE - owner occupied | Special mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	0.0		0.0
Year before current fiscal year	0.0		0.0
Two years before current fiscal year	2.0		0.0
Three years before current fiscal year	0.0		0.0
Four years before current fiscal year	0.0		0.0
Five or more years before current fiscal year	0.0		1.0
Revolving Loans Amortized Cost Basis	0.0		0.0
Loans HFI, net of deferred fees and costs	2.0		1.0
CRE - owner occupied | Classified
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	0.0		2.0
Year before current fiscal year	2.0		1.0
Two years before current fiscal year	1.0		4.0
Three years before current fiscal year	4.0		1.0
Four years before current fiscal year	1.0		1.0
Five or more years before current fiscal year	39.0		38.0
Revolving Loans Amortized Cost Basis	0.0		0.0
Loans HFI, net of deferred fees and costs	47.0		47.0
Hotel franchise finance
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	97.0		651.0
Year before current fiscal year	597.0		1,543.0
Two years before current fiscal year	1,449.0		680.0
Three years before current fiscal year	561.0		95.0
Four years before current fiscal year	94.0		497.0
Five or more years before current fiscal year	626.0		257.0
Revolving Loans Amortized Cost Basis	132.0		132.0
Loans HFI, net of deferred fees and costs	3,556.0		3,855.0
Current fiscal year, writeoff	0.0	0.0
Year before current fiscal year, writeoff	0.0	0.0
Two years before current fiscal year, writeoff	0.0	0.0
Three years before current fiscal year, writeoff	1.4	0.0
Four years before current fiscal year, writeoff	0.0	0.0
Five years before current fiscal year, writeoff	1.5	0.0
Revolving Loans Amortized Cost Basis, Writeoff	0.0	0.0
Charge-offs	2.9	0.0
Hotel franchise finance | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	97.0		593.0
Year before current fiscal year	563.0		1,535.0
Two years before current fiscal year	1,449.0		566.0
Three years before current fiscal year	474.0		95.0
Four years before current fiscal year	94.0		419.0
Five or more years before current fiscal year	571.0		165.0
Revolving Loans Amortized Cost Basis	132.0		132.0
Loans HFI, net of deferred fees and costs	3,380.0		3,505.0
Hotel franchise finance | Special mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	0.0		34.0
Year before current fiscal year	34.0		0.0
Two years before current fiscal year	0.0		66.0
Three years before current fiscal year	67.0		0.0
Four years before current fiscal year	0.0		35.0
Five or more years before current fiscal year	0.0		68.0
Revolving Loans Amortized Cost Basis	0.0		0.0
Loans HFI, net of deferred fees and costs	101.0		203.0
Hotel franchise finance | Classified
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	0.0		24.0
Year before current fiscal year	0.0		8.0
Two years before current fiscal year	0.0		48.0
Three years before current fiscal year	20.0		0.0
Four years before current fiscal year	0.0		43.0
Five or more years before current fiscal year	55.0		24.0
Revolving Loans Amortized Cost Basis	0.0		0.0
Loans HFI, net of deferred fees and costs	75.0		147.0
Other CRE - non-owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	452.0		2,024.0
Year before current fiscal year	1,870.0		1,784.0
Two years before current fiscal year	1,911.0		863.0
Three years before current fiscal year	873.0		501.0
Four years before current fiscal year	454.0		208.0
Five or more years before current fiscal year	359.0		207.0
Revolving Loans Amortized Cost Basis	446.0		387.0
Loans HFI, net of deferred fees and costs	6,365.0		5,974.0
Current fiscal year, writeoff	0.0	0.0
Year before current fiscal year, writeoff	0.0	0.0
Two years before current fiscal year, writeoff	0.0	0.0
Three years before current fiscal year, writeoff	5.0	0.0
Four years before current fiscal year, writeoff	0.0	0.0
Five years before current fiscal year, writeoff	0.0	0.0
Revolving Loans Amortized Cost Basis, Writeoff	0.0	0.0
Charge-offs	5.0	0.0
Other CRE - non-owner occupied | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	452.0		1,832.0
Year before current fiscal year	1,678.0		1,784.0
Two years before current fiscal year	1,862.0		754.0
Three years before current fiscal year	780.0		457.0
Four years before current fiscal year	413.0		166.0
Five or more years before current fiscal year	346.0		206.0
Revolving Loans Amortized Cost Basis	446.0		387.0
Loans HFI, net of deferred fees and costs	5,977.0		5,586.0
Other CRE - non-owner occupied | Special mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	0.0		164.0
Year before current fiscal year	94.0		0.0
Two years before current fiscal year	49.0		16.0
Three years before current fiscal year	0.0		43.0
Four years before current fiscal year	40.0		28.0
Five or more years before current fiscal year	0.0		0.0
Revolving Loans Amortized Cost Basis	0.0		0.0
Loans HFI, net of deferred fees and costs	183.0		251.0
Other CRE - non-owner occupied | Classified
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	0.0		28.0
Year before current fiscal year	98.0		0.0
Two years before current fiscal year	0.0		93.0
Three years before current fiscal year	93.0		1.0
Four years before current fiscal year	1.0		14.0
Five or more years before current fiscal year	13.0		1.0
Revolving Loans Amortized Cost Basis	0.0		0.0
Loans HFI, net of deferred fees and costs	205.0		137.0
Residential
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	78.0		325.0
Year before current fiscal year	278.0		3,599.0
Two years before current fiscal year	3,545.0		8,018.0
Three years before current fiscal year	7,925.0		823.0
Four years before current fiscal year	810.0		274.0
Five or more years before current fiscal year	465.0		209.0
Revolving Loans Amortized Cost Basis	23.0		20.0
Cumulative fair value hedging adjustment	(46.0)		19.0
Loans HFI, net of deferred fees and costs	13,078.0		13,287.0
Current fiscal year, writeoff	0.0	0.0
Year before current fiscal year, writeoff	0.0	0.0
Two years before current fiscal year, writeoff	0.0	0.0
Three years before current fiscal year, writeoff	0.0	0.0
Four years before current fiscal year, writeoff	0.0	0.0
Five years before current fiscal year, writeoff	0.0	0.0
Revolving Loans Amortized Cost Basis, Writeoff	0.0	0.0
Charge-offs	0.0	0.0
Residential | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	78.0		324.0
Year before current fiscal year	278.0		3,573.0
Two years before current fiscal year	3,513.0		7,985.0
Three years before current fiscal year	7,890.0		819.0
Four years before current fiscal year	805.0		270.0
Five or more years before current fiscal year	458.0		207.0
Revolving Loans Amortized Cost Basis	23.0		20.0
Loans HFI, net of deferred fees and costs	13,045.0		13,198.0
Residential | Special mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	0.0		0.0
Year before current fiscal year	0.0		0.0
Two years before current fiscal year	0.0		0.0
Three years before current fiscal year	0.0		0.0
Four years before current fiscal year	0.0		0.0
Five or more years before current fiscal year	0.0		0.0
Revolving Loans Amortized Cost Basis	0.0		0.0
Loans HFI, net of deferred fees and costs	0.0		0.0
Residential | Classified
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	0.0		1.0
Year before current fiscal year	0.0		26.0
Two years before current fiscal year	32.0		33.0
Three years before current fiscal year	35.0		4.0
Four years before current fiscal year	5.0		4.0
Five or more years before current fiscal year	7.0		2.0
Revolving Loans Amortized Cost Basis	0.0		0.0
Loans HFI, net of deferred fees and costs	79.0		70.0
Residential - EBO
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	0.0		2.0
Year before current fiscal year	11.0		8.0
Two years before current fiscal year	17.0		227.0
Three years before current fiscal year	220.0		534.0
Four years before current fiscal year	513.0		231.0
Five or more years before current fiscal year	410.0		221.0
Revolving Loans Amortized Cost Basis	0.0		0.0
Loans HFI, net of deferred fees and costs	1,171.0		1,223.0
Current fiscal year, writeoff	0.0	0.0
Year before current fiscal year, writeoff	0.0	0.0
Two years before current fiscal year, writeoff	0.0	0.0
Three years before current fiscal year, writeoff	0.0	0.0
Four years before current fiscal year, writeoff	0.0	0.0
Five years before current fiscal year, writeoff	0.0	0.0
Revolving Loans Amortized Cost Basis, Writeoff	0.0	0.0
Charge-offs	0.0	0.0
Residential - EBO | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	0.0		2.0
Year before current fiscal year	11.0		8.0
Two years before current fiscal year	17.0		227.0
Three years before current fiscal year	220.0		534.0
Four years before current fiscal year	513.0		231.0
Five or more years before current fiscal year	410.0		221.0
Revolving Loans Amortized Cost Basis	0.0		0.0
Loans HFI, net of deferred fees and costs	1,171.0		1,223.0
Residential - EBO | Special mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	0.0		0.0
Year before current fiscal year	0.0		0.0
Two years before current fiscal year	0.0		0.0
Three years before current fiscal year	0.0		0.0
Four years before current fiscal year	0.0		0.0
Five or more years before current fiscal year	0.0		0.0
Revolving Loans Amortized Cost Basis	0.0		0.0
Loans HFI, net of deferred fees and costs	0.0		0.0
Residential - EBO | Classified
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	0.0		0.0
Year before current fiscal year	0.0		0.0
Two years before current fiscal year	0.0		0.0
Three years before current fiscal year	0.0		0.0
Four years before current fiscal year	0.0		0.0
Five or more years before current fiscal year	0.0		0.0
Revolving Loans Amortized Cost Basis	0.0		0.0
Loans HFI, net of deferred fees and costs	0.0		0.0
Construction and land development
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	68.0		1,014.0
Year before current fiscal year	906.0		2,250.0
Two years before current fiscal year	2,109.0		385.0
Three years before current fiscal year	325.0		62.0
Four years before current fiscal year	62.0		0.0
Five or more years before current fiscal year	0.0		0.0
Revolving Loans Amortized Cost Basis	1,276.0		1,151.0
Loans HFI, net of deferred fees and costs	4,746.0		4,862.0
Current fiscal year, writeoff	0.0	0.0
Year before current fiscal year, writeoff	0.0	0.0
Two years before current fiscal year, writeoff	0.0	0.0
Three years before current fiscal year, writeoff	0.0	0.0
Four years before current fiscal year, writeoff	0.0	0.0
Five years before current fiscal year, writeoff	0.0	0.0
Revolving Loans Amortized Cost Basis, Writeoff	0.0	0.0
Charge-offs	0.0	0.0
Construction and land development | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	68.0		1,013.0
Year before current fiscal year	906.0		2,231.0
Two years before current fiscal year	2,085.0		385.0
Three years before current fiscal year	325.0		10.0
Four years before current fiscal year	11.0		0.0
Five or more years before current fiscal year	0.0		0.0
Revolving Loans Amortized Cost Basis	1,276.0		1,151.0
Loans HFI, net of deferred fees and costs	4,671.0		4,790.0
Construction and land development | Special mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	0.0		0.0
Year before current fiscal year	0.0		0.0
Two years before current fiscal year	5.0		0.0
Three years before current fiscal year	0.0		0.0
Four years before current fiscal year	0.0		0.0
Five or more years before current fiscal year	0.0		0.0
Revolving Loans Amortized Cost Basis	0.0		0.0
Loans HFI, net of deferred fees and costs	5.0		0.0
Construction and land development | Classified
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	0.0		1.0
Year before current fiscal year	0.0		19.0
Two years before current fiscal year	19.0		0.0
Three years before current fiscal year	0.0		52.0
Four years before current fiscal year	51.0		0.0
Five or more years before current fiscal year	0.0		0.0
Revolving Loans Amortized Cost Basis	0.0		0.0
Loans HFI, net of deferred fees and costs	70.0		72.0
Other
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	2.0		4.0
Year before current fiscal year	1.0		10.0
Two years before current fiscal year	10.0		3.0
Three years before current fiscal year	2.0		11.0
Four years before current fiscal year	11.0		3.0
Five or more years before current fiscal year	72.0		64.0
Revolving Loans Amortized Cost Basis	52.0		66.0
Loans HFI, net of deferred fees and costs	150.0		161.0
Current fiscal year, writeoff	0.0	0.0
Year before current fiscal year, writeoff	0.0	0.1
Two years before current fiscal year, writeoff	0.0	0.0
Three years before current fiscal year, writeoff	0.0	0.0
Four years before current fiscal year, writeoff	0.0	0.0
Five years before current fiscal year, writeoff	0.0	0.0
Revolving Loans Amortized Cost Basis, Writeoff	0.0	0.0
Charge-offs	0.0	$ 0.1
Other | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	2.0		4.0
Year before current fiscal year	1.0		10.0
Two years before current fiscal year	10.0		3.0
Three years before current fiscal year	2.0		11.0
Four years before current fiscal year	11.0		3.0
Five or more years before current fiscal year	68.0		62.0
Revolving Loans Amortized Cost Basis	52.0		66.0
Loans HFI, net of deferred fees and costs	146.0		159.0
Other | Special mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	0.0		0.0
Year before current fiscal year	0.0		0.0
Two years before current fiscal year	0.0		0.0
Three years before current fiscal year	0.0		0.0
Four years before current fiscal year	0.0		0.0
Five or more years before current fiscal year	3.0		1.0
Revolving Loans Amortized Cost Basis	0.0		0.0
Loans HFI, net of deferred fees and costs	3.0		1.0
Other | Classified
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	0.0		0.0
Year before current fiscal year	0.0		0.0
Two years before current fiscal year	0.0		0.0
Three years before current fiscal year	0.0		0.0
Four years before current fiscal year	0.0		0.0
Five or more years before current fiscal year	1.0		1.0
Revolving Loans Amortized Cost Basis	0.0		0.0
Loans HFI, net of deferred fees and costs	$ 1.0		$ 1.0

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Loans, Leases and Allowance for Credit Losses - Amortized Cost Basis of Loans Modified (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 108.0	$ 26.0
% of Total Class of Financing Receivable	0.20%	0.10%
Payment Delay and Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 0.0	$ 2.0
Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	78.0	18.0
Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	30.0	6.0
Tech & innovation
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 30.0	$ 7.0
% of Total Class of Financing Receivable	1.00%	0.30%
Tech & innovation | Payment Delay and Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 0.0	$ 2.0
Tech & innovation | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0.0	0.0
Tech & innovation | Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	30.0	5.0
Other commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 8.0
% of Total Class of Financing Receivable	0.10%
Other commercial and industrial | Payment Delay and Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 0.0
Other commercial and industrial | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	8.0
Other commercial and industrial | Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0.0
CRE - owner occupied
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 31.0
% of Total Class of Financing Receivable	1.80%
CRE - owner occupied | Payment Delay and Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 0.0
CRE - owner occupied | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	31.0
CRE - owner occupied | Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0.0
Construction and land development
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 39.0
% of Total Class of Financing Receivable	0.80%
Construction and land development | Payment Delay and Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 0.0
Construction and land development | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	39.0
Construction and land development | Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 0.0
Hotel franchise finance
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis		$ 18.0
% of Total Class of Financing Receivable		0.50%
Hotel franchise finance | Payment Delay and Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis		$ 0.0
Hotel franchise finance | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis		18.0
Hotel franchise finance | Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis		0.0
Residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis		$ 1.0
% of Total Class of Financing Receivable		0.00%
Residential | Payment Delay and Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis		$ 0.0
Residential | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis		0.0
Residential | Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis		$ 1.0

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Loans, Leases and Allowance for Credit Losses - Troubled Debt Restructurings (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 108.0	$ 26.0
% of Total Class of Financing Receivable	0.20%	0.10%
Payment Delay and Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 0.0	$ 2.0
Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	78.0	18.0
Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	30.0	6.0
Other commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 8.0
% of Total Class of Financing Receivable	0.10%
Other commercial and industrial | Payment Delay and Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 0.0
Other commercial and industrial | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	8.0
Other commercial and industrial | Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0.0
CRE - owner occupied
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 31.0
% of Total Class of Financing Receivable	1.80%
CRE - owner occupied | Payment Delay and Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 0.0
CRE - owner occupied | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	31.0
CRE - owner occupied | Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0.0
Construction and land development
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 39.0
% of Total Class of Financing Receivable	0.80%
Construction and land development | Payment Delay and Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 0.0
Construction and land development | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	39.0
Construction and land development | Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 0.0
Hotel franchise finance
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis		$ 18.0
% of Total Class of Financing Receivable		0.50%
Hotel franchise finance | Payment Delay and Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis		$ 0.0
Hotel franchise finance | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis		18.0
Hotel franchise finance | Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis		$ 0.0

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Loans, Leases and Allowance for Credit Losses - Collateral Dependent Loans (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Loans and Leases Receivable Disclosure [Line Items]
Net loans HFI	$ 50,360.0	$ 49,960.0
Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Net loans HFI	444.0	389.0
Real Estate Collateral | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Net loans HFI	378.0	354.0
Other Collateral | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Net loans HFI	66.0	35.0
Municipal & nonprofit | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Net loans HFI	5.0	6.0
Municipal & nonprofit | Real Estate Collateral | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Net loans HFI	0.0	0.0
Municipal & nonprofit | Other Collateral | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Net loans HFI	5.0	6.0
Tech & innovation | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Net loans HFI	35.0	0.0
Tech & innovation | Real Estate Collateral
Loans and Leases Receivable Disclosure [Line Items]
Net loans HFI	0.0	0.0
Tech & innovation | Other Collateral
Loans and Leases Receivable Disclosure [Line Items]
Net loans HFI	35.0	0.0
Other commercial and industrial | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Net loans HFI	26.0	29.0
Other commercial and industrial | Real Estate Collateral | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Net loans HFI	0.0	0.0
Other commercial and industrial | Other Collateral | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Net loans HFI	26.0	29.0
CRE - owner occupied | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Net loans HFI	42.0	43.0
CRE - owner occupied | Real Estate Collateral | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Net loans HFI	42.0	43.0
CRE - owner occupied | Other Collateral | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Net loans HFI	0.0	0.0
Hotel franchise finance | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Net loans HFI	63.0	104.0
Hotel franchise finance | Real Estate Collateral | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Net loans HFI	63.0	104.0
Hotel franchise finance | Other Collateral | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Net loans HFI	0.0	0.0
Other CRE - non-owner occupied | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Net loans HFI	204.0	136.0
Other CRE - non-owner occupied | Real Estate Collateral | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Net loans HFI	204.0	136.0
Other CRE - non-owner occupied | Other Collateral | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Net loans HFI	0.0	0.0
Construction and land development | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Net loans HFI	69.0	71.0
Construction and land development | Real Estate Collateral | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Net loans HFI	69.0	71.0
Construction and land development | Other Collateral | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Net loans HFI	$ 0.0	$ 0.0

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Loans, Leases and Allowance for Credit Losses - Allowances for Credit Losses (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 336.7	$ 309.7
Provision for (Recovery of) Credit Losses	13.4	1.0
Charge-offs	10.2	9.2
Recoveries	(0.4)	(3.2)
Ending balance	340.3	304.7
Off-Balance-Sheet, Credit Loss, Liability [Roll Forward]
Balance, beginning of period	31.6	47.0
Provision for (Recovery of) credit losses	1.5	(2.2)
Balance, end of period	33.1	44.8
Warehouse lending
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	5.8	8.4
Provision for (Recovery of) Credit Losses	1.5	(1.8)
Charge-offs	0.0	0.0
Recoveries	0.0	0.0
Ending balance	7.3	6.6
Municipal & nonprofit
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	14.7	15.9
Provision for (Recovery of) Credit Losses	(0.8)	2.5
Charge-offs	0.0	0.0
Recoveries	0.0	0.0
Ending balance	13.9	18.4
Tech & innovation
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	42.1	30.8
Provision for (Recovery of) Credit Losses	5.9	7.4
Charge-offs	0.0	1.8
Recoveries	0.0	0.0
Ending balance	48.0	36.4
Equity fund resources
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1.3	6.4
Provision for (Recovery of) Credit Losses	(0.1)	(3.1)
Charge-offs	0.0	0.0
Recoveries	0.0	0.0
Ending balance	1.2	3.3
Other commercial and industrial
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	81.4	85.9
Provision for (Recovery of) Credit Losses	(12.4)	(30.7)
Charge-offs	2.3	7.3
Recoveries	(0.4)	(3.2)
Ending balance	67.1	51.1
CRE - owner occupied
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	6.0	7.1
Provision for (Recovery of) Credit Losses	0.2	1.5
Charge-offs	0.0	0.0
Recoveries	0.0	0.0
Ending balance	6.2	8.6
Hotel franchise finance
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	33.4	46.9
Provision for (Recovery of) Credit Losses	5.3	0.8
Charge-offs	2.9	0.0
Recoveries	0.0	0.0
Ending balance	35.8	47.7
Other CRE - non-owner occupied
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	96.0	47.4
Provision for (Recovery of) Credit Losses	13.7	19.0
Charge-offs	5.0	0.0
Recoveries	0.0	0.0
Ending balance	104.7	66.4
Residential
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	23.1	30.4
Provision for (Recovery of) Credit Losses	(1.0)	1.3
Charge-offs	0.0	0.0
Recoveries	0.0	0.0
Ending balance	22.1	31.7
Residential - EBO
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	0.0	0.0
Provision for (Recovery of) Credit Losses	0.0	0.0
Charge-offs	0.0	0.0
Recoveries	0.0	0.0
Ending balance	0.0	0.0
Construction and land development
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	30.4	27.4
Provision for (Recovery of) Credit Losses	1.5	4.1
Charge-offs	0.0	0.0
Recoveries	0.0	0.0
Ending balance	31.9	31.5
Other
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	2.5	3.1
Provision for (Recovery of) Credit Losses	(0.4)	0.0
Charge-offs	0.0	0.1
Recoveries	0.0	0.0
Ending balance	$ 2.1	$ 3.0

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Loans, Leases and Allowance for Credit Losses - Disaggregation of the Company's ACL on Funded Loans and Loan Balances (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Line Items]
Collectively Evaluated for Credit Loss	$ 50,030.0	$ 49,723.0
Individually Evaluated for Credit Loss	670.0	574.0
Loans HFI, net of deferred fees and costs	50,700.0	50,297.0
Collectively Evaluated for Credit Loss	327.4	315.1
Individually Evaluated for Credit Loss	12.9	21.6
Total	340.3	336.7	$ 304.7	$ 309.7
Warehouse lending
Financing Receivable, Allowance for Credit Loss [Line Items]
Collectively Evaluated for Credit Loss	6,915.0	6,618.0
Individually Evaluated for Credit Loss	0.0	0.0
Loans HFI, net of deferred fees and costs	6,915.0	6,618.0
Collectively Evaluated for Credit Loss	7.3	5.8
Individually Evaluated for Credit Loss	0.0	0.0
Total	7.3	5.8	6.6	8.4
Municipal & nonprofit
Financing Receivable, Allowance for Credit Loss [Line Items]
Collectively Evaluated for Credit Loss	1,617.0	1,548.0
Individually Evaluated for Credit Loss	5.0	6.0
Loans HFI, net of deferred fees and costs	1,622.0	1,554.0
Collectively Evaluated for Credit Loss	13.2	13.7
Individually Evaluated for Credit Loss	0.7	1.0
Total	13.9	14.7	18.4	15.9
Tech & innovation
Financing Receivable, Allowance for Credit Loss [Line Items]
Collectively Evaluated for Credit Loss	2,832.0	2,729.0
Individually Evaluated for Credit Loss	109.0	79.0
Loans HFI, net of deferred fees and costs	2,941.0	2,808.0
Collectively Evaluated for Credit Loss	40.8	38.3
Individually Evaluated for Credit Loss	7.2	3.8
Total	48.0	42.1	36.4	30.8
Equity fund resources
Financing Receivable, Allowance for Credit Loss [Line Items]
Collectively Evaluated for Credit Loss	695.0	845.0
Individually Evaluated for Credit Loss	0.0	0.0
Loans HFI, net of deferred fees and costs	695.0	845.0
Collectively Evaluated for Credit Loss	1.2	1.3
Individually Evaluated for Credit Loss	0.0	0.0
Total	1.2	1.3	3.3	6.4
Other commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Collectively Evaluated for Credit Loss	7,591.0	7,362.0
Individually Evaluated for Credit Loss	163.0	90.0
Loans HFI, net of deferred fees and costs	7,754.0	7,452.0
Collectively Evaluated for Credit Loss	62.5	64.6
Individually Evaluated for Credit Loss	4.6	16.8
Total	67.1	81.4	51.1	85.9
CRE - owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Collectively Evaluated for Credit Loss	1,664.0	1,613.0
Individually Evaluated for Credit Loss	43.0	45.0
Loans HFI, net of deferred fees and costs	1,707.0	1,658.0
Collectively Evaluated for Credit Loss	6.2	6.0
Individually Evaluated for Credit Loss	0.0	0.0
Total	6.2	6.0	8.6	7.1
Hotel franchise finance
Financing Receivable, Allowance for Credit Loss [Line Items]
Collectively Evaluated for Credit Loss	3,481.0	3,708.0
Individually Evaluated for Credit Loss	75.0	147.0
Loans HFI, net of deferred fees and costs	3,556.0	3,855.0
Collectively Evaluated for Credit Loss	35.4	33.4
Individually Evaluated for Credit Loss	0.4	0.0
Total	35.8	33.4	47.7	46.9
Other CRE - non-owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Collectively Evaluated for Credit Loss	6,161.0	5,838.0
Individually Evaluated for Credit Loss	204.0	136.0
Loans HFI, net of deferred fees and costs	6,365.0	5,974.0
Collectively Evaluated for Credit Loss	104.7	96.0
Individually Evaluated for Credit Loss	0.0	0.0
Total	104.7	96.0	66.4	47.4
Residential
Financing Receivable, Allowance for Credit Loss [Line Items]
Collectively Evaluated for Credit Loss	13,078.0	13,287.0
Individually Evaluated for Credit Loss	0.0	0.0
Loans HFI, net of deferred fees and costs	13,078.0	13,287.0
Collectively Evaluated for Credit Loss	22.1	23.1
Individually Evaluated for Credit Loss	0.0	0.0
Total	22.1	23.1	31.7	30.4
Residential - EBO
Financing Receivable, Allowance for Credit Loss [Line Items]
Collectively Evaluated for Credit Loss	1,171.0	1,223.0
Individually Evaluated for Credit Loss	0.0	0.0
Loans HFI, net of deferred fees and costs	1,171.0	1,223.0
Collectively Evaluated for Credit Loss	0.0	0.0
Individually Evaluated for Credit Loss	0.0	0.0
Total	0.0	0.0	0.0	0.0
Construction and land development
Financing Receivable, Allowance for Credit Loss [Line Items]
Collectively Evaluated for Credit Loss	4,676.0	4,791.0
Individually Evaluated for Credit Loss	70.0	71.0
Loans HFI, net of deferred fees and costs	4,746.0	4,862.0
Collectively Evaluated for Credit Loss	31.9	30.4
Individually Evaluated for Credit Loss	0.0	0.0
Total	31.9	30.4	31.5	27.4
Other
Financing Receivable, Allowance for Credit Loss [Line Items]
Collectively Evaluated for Credit Loss	149.0	161.0
Individually Evaluated for Credit Loss	1.0	0.0
Loans HFI, net of deferred fees and costs	150.0	161.0
Collectively Evaluated for Credit Loss	2.1	2.5
Individually Evaluated for Credit Loss	0.0	0.0
Total	$ 2.1	$ 2.5	$ 3.0	$ 3.1

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Mortgage Servicing Rights - Changes in Fair Value of the Company's MSR Portfolio (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Servicing Asset at Fair Value, Amount [Roll Forward]
Balance, beginning of period	$ 1,124	$ 1,148
Mortgage servicing rights capitalized upon sale of mortgage loans	189	142
Carrying value of MSRs sold	(156)	(350)
Change in fair value	60	(8)
Mark to market adjustments	0	3
Realization of cash flows	(39)	(25)
Balance, end of period	1,178	910
Unpaid principal balance of mortgage loans serviced for others	$ 65,620	$ 58,466

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Mortgage Servicing Rights - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Servicing Assets at Fair Value [Line Items]
MSR UPB of underlying loans	$ 10,800.0	$ 19,500.0
Remaining receivable balance	34.0		$ 41.0
Ancillary income associated with the Company's MSR portfolio	67.0	62.9
Servicing advances, net	67.0		$ 87.0
Servicing Contracts
Servicing Assets at Fair Value [Line Items]
Disposals of servicing assets	$ 156.0	$ 350.0

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Mortgage Servicing Rights - Effect of Hypothetical Changes in the Fair Value of MSRs (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Transfers and Servicing [Abstract]
Fair value of mortgage servicing rights	$ 1,178	$ 1,124	$ 910	$ 1,148
Adverse change	(65)
Favorable change	57
Increase	(23)
Decrease	24
Increase	(33)
Decrease	36
Increase	(14)
Decrease	$ 14

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Deposits - Deposits by Type (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Other Liabilities Disclosure [Abstract]
Non-interest-bearing demand	$ 18,399	$ 14,520
Interest-bearing transaction accounts	16,965	15,916
Savings and money market accounts	16,194	14,791
Time certificates of deposit ($250,000 or more)	1,683	1,478
Other time deposits	8,987	8,628
Total deposits	62,228	55,333
Retail brokered time deposits over $250,000	$ 5,700	$ 5,800

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Deposits - Summary of Contractual Maturities for Time Deposits (Details) $ in Millions	Mar. 31, 2024 USD ($)
Other Liabilities Disclosure [Abstract]
2024	$ 8,311.0
2025	2,328.0
2026	26.0
2027	3.0
2028	1.0
Thereafter	1.0
Total	$ 10,670.0

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Deposits - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Other Liabilities Disclosure [Abstract]
Wholesale deposits	$ 6,500.0		$ 6,600.0
Reciprocal deposits	14,500.0		13,300.0
Earnings credits or referral fees	22,200.0		$ 17,800.0
Deposits costs, deposits with earnings credits	$ 131.2	$ 85.6

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Other Borrowings - Company's Borrowings (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Debt [Line Items]
Federal funds purchased	$ 0	$ 175
FHLB advances	5,750	6,200
Customer repurchase agreements	8	382
Short-term Debt	5,780	6,784
Credit linked notes, net	441	446
Long-term Debt	441	446
Other borrowings	6,221	7,230
Secured borrowings
Debt [Line Items]
Secured borrowings	$ 22	$ 27

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Other Borrowings - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Debt [Line Items]
Weighted average rate on FHLB advances	5.66%		5.67%
Customer repurchase agreements	$ 8.0		$ 382.0
Gain on extinguishment of debt	0.0	$ 12.7
Credit Linked Notes
Debt [Line Items]
Debt Issuance Costs	7.0		8.0
Principal	$ 455.0		460.0
Fed Funds Effective Rate Overnight Index Swap Rate | Minimum
Debt [Line Items]
Period of basis point spread	0.10%
Fed Funds Effective Rate Overnight Index Swap Rate | Maximum
Debt [Line Items]
Period of basis point spread	0.20%
Customer Repurchase Agreements
Debt [Line Items]
Customer repurchase agreements	$ 8.0		6.0
Federal Home Loan Bank Advances
Debt [Line Items]
Additional available credit with the entity	8,000.0		6,100.0
Revolving Credit Facility
Debt [Line Items]
Secured borrowing credit line	839.0
Warehouse Agreement Borrowings
Debt [Line Items]
Additional available credit with the entity	2,300.0
Warehouse borrowings	$ 0.0		$ 376.0
Weighted average borrowing rate			6.72%
Secured Debt
Debt [Line Items]
Weighted average borrowing rate	6.58%		6.10%

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Other Borrowings - Outstanding Credit Linked Noted Issuances (Details) - Credit Linked Notes - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Debt [Line Items]
Principal	$ 455	$ 460
Debt Issuance Costs	7	8
Credit Linked Notes Maturing October 2052
Debt [Line Items]
Principal	89	90
Debt Issuance Costs	2	2
Reference pool balance	$ 1,800	$ 1,800
Credit Linked Notes Maturing October 2052 | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt [Line Items]
Period of basis point spread	7.80%	7.80%
Weighted average borrowing rate	7.80%
Credit Linked Notes Maturing October 2052 | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Minimum
Debt [Line Items]
Period of basis point spread	2.25%
Credit Linked Notes Maturing October 2052 | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Maximum
Debt [Line Items]
Period of basis point spread	11.00%
Credit Linked Notes Maturing April 2052
Debt [Line Items]
Principal	$ 177	$ 179
Debt Issuance Costs	3	3
Reference pool balance	$ 3,500	$ 3,600
Credit Linked Notes Maturing April 2052 | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt [Line Items]
Period of basis point spread	6.00%	6.00%
Weighted average borrowing rate	6.00%
Credit Linked Notes Maturing April 2052 | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Minimum
Debt [Line Items]
Period of basis point spread	2.25%
Credit Linked Notes Maturing April 2052 | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Maximum
Debt [Line Items]
Period of basis point spread	15.00%
Credit Linked Notes Maturing July 2059
Debt [Line Items]
Principal	$ 189	$ 191
Debt Issuance Costs	2	3
Reference pool balance	$ 3,700	$ 3,800
Credit Linked Notes Maturing July 2059 | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt [Line Items]
Period of basis point spread	4.67%	4.67%
Weighted average borrowing rate	4.67%
Credit Linked Notes Maturing July 2059 | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Minimum
Debt [Line Items]
Period of basis point spread	3.15%
Credit Linked Notes Maturing July 2059 | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Maximum
Debt [Line Items]
Period of basis point spread	8.50%

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Qualifying Debt - Subordinated Debt Issuances (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Subordinated Debt
Debt Instrument [Line Items]
Principal	$ 825	$ 825
Debt Issuance Costs	$ 7	$ 7
Subordinated Debentures Maturing June 2031
Debt Instrument [Line Items]
Interest rate	3.00%
Subordinated Debentures Maturing June 2031 | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Period of basis point spread	2.25%
Subordinated Debentures Maturing June 2031 | Subordinated Debt
Debt Instrument [Line Items]
Interest rate	3.00%	3.00%
Principal	$ 600	$ 600
Debt Issuance Costs	$ 6	$ 6
Subordinated Debentures Maturing June 2030
Debt Instrument [Line Items]
Interest rate	5.25%
Subordinated Debentures Maturing June 2030 | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Period of basis point spread	5.12%
Subordinated Debentures Maturing June 2030 | Subordinated Debt
Debt Instrument [Line Items]
Interest rate	5.25%	5.25%
Principal	$ 225	$ 225
Debt Issuance Costs	$ 1	$ 1

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Qualifying Debt (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($) Trust	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
Subordinated debt issuances	$ 818	$ 818
Number of statutory business trusts | Trust	8
Junior subordinated debt	$ 78	$ 77
Junior Subordinated Debt
Debt Instrument [Line Items]
Weighted average interest rate	7.90%	7.93%

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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock, shares outstanding (shares)	12,000,000			12,000,000
Preferred stock dividend rate	4.25%
Preferred stock, par value (dollars per share)	$ 0.0001			$ 0.0001
Preferred stock, liquidation value (dollars per share)	25			$ 25
Cash dividend (dollars per share)	$ 0.27		$ 0.27
Dividends, preferred stock	$ 3.2		$ 3.2
Dividends paid	$ 40.7		$ 39.4
Cash dividend per share (dollars per share)	$ 0.37	$ 0.36	$ 0.36
Shares withheld (shares)	122,597		143,404
Weighted average price of treasury shares (dollars per share)	$ 61.55		$ 74.70
Series A Preferred Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock, liquidation value (dollars per share)	$ 10,000
ATM Offering
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock issuance, net (shares)	0		0
Remaining shares available (shares)	1,107,769
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate grant date fair value	$ 44.8		$ 44.5
Stock-based compensation expense	$ 12.1		8.5
Restricted Stock | Share-Based Payment Arrangement, Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Restricted Stock | Share-Based Payment Arrangement, Nonemployee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	6 months
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Stock-based compensation expense	$ 1.0		(2.5)
Performance Shares | Grant year 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Vesting percentage	168.00%
Vested (shares)	129,942
Performance Shares | Grant year 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Vesting percentage	180.00%
Vested (shares)	157,784
Cash Settled Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Stock-based compensation expense	$ 0.1		0.0
Retained Earnings
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends, preferred stock	3.2		3.2
Dividends paid	$ 40.7		$ 39.4
Preferred Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock, shares outstanding (shares)	12,000,000

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Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (513.0)
Net other comprehensive (loss) income	(44.7)	$ 69.5
Ending balance	(558.0)
Unrealized holding gains (losses) on AFS securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(516.6)	(663.7)
Other comprehensive income before reclassifications	(44.9)	60.1
Amounts reclassified from accumulated other comprehensive income	0.7	9.3
Net other comprehensive (loss) income	(44.2)	69.4
Ending balance	(560.8)	(594.3)
Unrealized holding gains (losses) on junior subordinated debt
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	2.8	3.0
Other comprehensive income before reclassifications	(0.5)	(1.1)
Amounts reclassified from accumulated other comprehensive income	0.0	0.0
Net other comprehensive (loss) income	(0.5)	(1.1)
Ending balance	2.3	1.9
Impairment loss on securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	1.2	0.0
Other comprehensive income before reclassifications	0.0	0.0
Amounts reclassified from accumulated other comprehensive income	0.0	1.2
Net other comprehensive (loss) income	0.0	1.2
Ending balance	1.2	1.2
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(512.9)	(661.0)
Other comprehensive income before reclassifications	(45.4)	59.0
Amounts reclassified from accumulated other comprehensive income	0.7	10.5
Net other comprehensive (loss) income	(44.7)	69.5
Ending balance	(557.6)	(591.5)
Unrealized holding losses on SERP
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(0.3)	(0.3)
Other comprehensive income before reclassifications	0.0	0.0
Amounts reclassified from accumulated other comprehensive income	0.0	0.0
Net other comprehensive (loss) income	0.0	0.0
Ending balance	$ (0.3)	$ (0.3)

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Accumulated Other Comprehensive Income (Loss) - Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount reclassified from accumulated other comprehensive income	$ 0.2	$ 3.2
Amount reclassified from accumulated other comprehensive income	$ (0.7)	$ (9.3)

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Derivatives and Hedging Activities - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Derivative [Line Items]
Cumulative basis adjustment including carrying value of hedged items	$ 66.0		$ 6.0
Collateral posted by this counterparty	146.0	$ 33.0	$ 216.0
Designated as Hedging Instrument
Derivative [Line Items]
Cumulative basis adjustment including carrying value of hedged items	(6.0)
Cumulative basis adjustment	(46.0)
Interest income related to amortization of cumulative basis adjustment	$ 3.0	$ 3.0

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Derivatives and Hedging Activities - Schedule of Derivative Assets at Fair Value (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Carrying Value of Hedged Assets/(Liabilities)	$ 3,857	$ 3,875
Cumulative basis adjustment including carrying value of hedged items	66	6
Loans HFI, net of deferred fees and costs	50,700	$ 50,297
Prepayable Fixed Rate Loans
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Loans HFI, net of deferred fees and costs	6,600
Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cumulative basis adjustment including carrying value of hedged items	(6)
Portfolio layer method derivative instruments	$ 3,500

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Derivatives and Hedging Activities - Derivative Instruments, Gain (Loss) (Details) - Interest income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(Loss) on Swaps	$ 72.0	$ (4.3)
Gain/(Loss) on Hedged Item	$ (72.5)	$ 4.3

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Derivatives and Hedging Activities - Schedule of Fair Value of the Company's Derivative Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	$ 30,087	$ 29,912	$ 31,056
Derivative Assets	241	260	52
Derivative Liabilities	40	78	43
Derivative Assets	205	271	66
Derivative Liabilities	61	67	63
Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	3,884	3,895	470
Derivative Assets	67	19	14
Derivative Liabilities	0	24	1
Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	30,087	29,912	31,056
Derivative Assets	66	69	61
Derivative Liabilities	53	76	77
Notional Amount, Margin
Derivative Assets, Margin	139	202	5
Derivative Liabilities, Margin	8	(9)	(14)
Interest rate contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Assets	84	31	14
Derivative Liabilities	2	31	1
Interest rate contracts | Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	3,884	3,895	470
Derivative Assets	67	19	14
Derivative Liabilities	0	24	1
Interest rate contracts | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	3,890	3,628	1,983
Derivative Assets	20	19	5
Derivative Liabilities	21	20	6
Foreign currency contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Assets	1	0	0
Derivative Liabilities	1	1	0
Foreign currency contracts | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	165	135	189
Derivative Assets	1	1	2
Derivative Liabilities	1	1	1
Forward purchase contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Assets	13	26	30
Derivative Liabilities	2	0	4
Forward purchase contracts | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	5,590	5,544	7,814
Derivative Assets	13	26	34
Derivative Liabilities	2	0	5
Forward sales contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Assets	4	1	3
Derivative Liabilities	27	55	52
Forward sales contracts | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	8,380	7,626	9,702
Derivative Assets	4	1	3
Derivative Liabilities	28	55	64
Futures purchase contracts | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	124	124	0
Derivative Assets	0	0	0
Derivative Liabilities	0	0	0
Futures sales contracts | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	9,996	10,906	9,710
Derivative Assets	0	0	0
Derivative Liabilities	0	0	0
Interest rate lock commitments | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	1,810	1,822	1,557
Derivative Assets	10	18	14
Derivative Liabilities	1	0	1
Risk participation agreements | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	75	72	51
Derivative Assets	0	0	0
Derivative Liabilities	0	0	0
Equity warrants | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	57	55	50
Derivative Assets	18	4	3
Derivative Liabilities	$ 0	$ 0	$ 0

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Derivatives and Hedging Activities - Fair Value After Master Netting Agreements (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Assets	$ 241.0	$ 260.0	$ 52.0
Derivative asset, subject to master netting arrangement, after offset	208.0	193.0	14.0
Derivative asset, collateral, obligation to return cash, offset	139.0	202.0	5.0
Derivative asset, subject to master netting arrangement, liability offset	(33.0)	(67.0)	(38.0)
Derivative liability, fair value	(40.0)	(78.0)	(43.0)
Derivative liability, subject to master netting arrangement, after offset	(7.0)	(11.0)	(5.0)
Derivative liability, collateral, right to reclaim cash, offset	(8.0)	9.0	14.0
Derivative liability, subject to master netting arrangement, asset offset	33.0	67.0	38.0
Derivative asset, not subject to master netting arrangement	31.0	30.0	28.0
Derivative liability, not subject to master netting arrangement	(21.0)	(13.0)	(21.0)
Derivative asset, fair value, gross asset including not subject to master netting arrangement	272.0	290.0	80.0
Derivative asset, fair value, offset against collateral, net of not subject to master netting arrangement	239.0	223.0	42.0
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(61.0)	(91.0)	(64.0)
Derivative liability, fair value, offset against collateral, net of not subject to master netting arrangement	(28.0)	(24.0)	(26.0)
Forward purchase contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Assets	13.0	26.0	30.0
Derivative asset, subject to master netting arrangement, after offset	13.0	26.0	30.0
Derivative liability, fair value	(2.0)	0.0	(4.0)
Derivative liability, subject to master netting arrangement, after offset	(2.0)	0.0	(4.0)
Derivative asset, not subject to master netting arrangement	0.0	0.0	4.0
Derivative liability, not subject to master netting arrangement	0.0	0.0	(1.0)
Forward sales contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Assets	4.0	1.0	3.0
Derivative asset, subject to master netting arrangement, after offset	4.0	1.0	3.0
Derivative liability, fair value	(27.0)	(55.0)	(52.0)
Derivative liability, subject to master netting arrangement, after offset	(27.0)	(55.0)	(52.0)
Derivative liability, not subject to master netting arrangement	(1.0)	0.0	(12.0)
Interest rate contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Assets	84.0	31.0	14.0
Derivative asset, subject to master netting arrangement, after offset	84.0	31.0	14.0
Derivative liability, fair value	(2.0)	(31.0)	(1.0)
Derivative liability, subject to master netting arrangement, after offset	(2.0)	(31.0)	(1.0)
Derivative asset, not subject to master netting arrangement	3.0	7.0	5.0
Derivative liability, not subject to master netting arrangement	(19.0)	(13.0)	(6.0)
Foreign currency contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Assets	1.0	0.0	0.0
Derivative asset, subject to master netting arrangement, after offset	1.0	0.0	0.0
Derivative liability, fair value	(1.0)	(1.0)	0.0
Derivative liability, subject to master netting arrangement, after offset	(1.0)	(1.0)	0.0
Derivative asset, not subject to master netting arrangement	0.0	1.0	2.0
Derivative liability, not subject to master netting arrangement	0.0	0.0	(1.0)
Interest rate lock commitments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative asset, not subject to master netting arrangement	10.0	18.0	14.0
Derivative liability, not subject to master netting arrangement	(1.0)	0.0	(1.0)
Equity warrants
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative asset, not subject to master netting arrangement	$ 18.0	$ 4.0	$ 3.0

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Derivatives and Hedging Activities - Net Gain (Loss) on Derivatives Included in Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total change in fair value of derivatives	$ 7.2	$ (24.6)
Net gain on loan origination and sale activities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total change in fair value of derivatives	$ 7.1	$ (24.6)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Net gain on loan origination and sale activities	Net gain on loan origination and sale activities
Loan servicing fees, net
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total change in fair value of derivatives	$ (41.9)	$ (13.4)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Net loan servicing revenue	Net loan servicing revenue
Interest rate lock commitments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total change in fair value of derivatives	$ (8.1)	$ 11.5
Forward Contracts | Net gain on loan origination and sale activities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total change in fair value of derivatives	16.7	(36.8)
Forward Contracts | Loan servicing fees, net
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total change in fair value of derivatives	(16.3)	(1.6)
Interest rate contracts | Net gain on loan origination and sale activities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total change in fair value of derivatives	(2.2)	1.2
Interest rate contracts | Loan servicing fees, net
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total change in fair value of derivatives	(36.3)	19.0
Other Contract
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total change in fair value of derivatives	0.7	(0.5)
Future
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total change in fair value of derivatives	$ 10.7	$ (4.0)

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Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average shares - basic (shares)	108.5	108.1
Dilutive effect of stock award (shares)	0.5	0.2
Weighted average shares - diluted (shares)	109.0	108.3
Net income available to common stockholders	$ 174.2	$ 139.0
Earnings per share:
Basic (dollars per share)	$ 1.61	$ 1.29
Diluted (dollars per share)	$ 1.60	$ 1.28

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Income Taxes - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Effective tax rate	23.50%	23.00%
Deferred tax assets, net	$ 300.0		$ 287.0
Deferred tax valuation allowance	0.0		0.0
Investments in LIHTC and renewable energy	553.0		573.0
Investment-related Liabilities	308.0		$ 322.0
Amortization of tax credit investments	18.6	$ 11.3
Increase (decrease) in DTA	$ 13.0

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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Loss Contingencies [Line Items]
Letters of credit expiration period	1 year
Other conditional commitments	$ 38.0		$ 32.0
Percentage of CRE loans occupied by owners	16.00%		16.00%
Lease cost	$ 7.0	$ 7.4
Lessee, operating lease, other cost	$ 1.5	$ 1.3
Commercial Real Estate Portfolio Segment | Loans Receivable | Credit Concentration Risk
Loss Contingencies [Line Items]
Percent of commercial real estate related loans	32.00%		33.00%
Commercial and industrial | Loans Receivable | Credit Concentration Risk
Loss Contingencies [Line Items]
Percent of commercial real estate related loans	39.00%		38.00%
Unfunded Loan Commitment
Loss Contingencies [Line Items]
Loss contingency accrual	$ 33.0		$ 32.0

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Commitments and Contingencies - Summary of Contractual Amounts for Unfunded Commitments and Letters of Credit (Detail) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Other Commitments [Line Items]
Total amount	$ 13,771	$ 13,931
Commitments to extend credit
Other Commitments [Line Items]
Unsecured loan commitments	937	989
Total amount	13,106	13,291
Credit card guarantees
Other Commitments [Line Items]
Total amount	427	418
Standby letters of credit
Other Commitments [Line Items]
Unsecured letters of credit	6	4
Total amount	$ 238	$ 222

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Fair Value Accounting - Gains and Losses from Fair Value Changes Included in Consolidated Statement of Operations (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes included in OCI, net of tax	$ (0.5)	$ (1.1)
Junior Subordinated Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized losses	$ (0.7)	$ (1.5)

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Fair Value Accounting - Fair Value of Assets and Liabilities (Detail) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities	$ 14,509.0	$ 11,165.0
Investment securities - equity	130.0	126.0
Fair value of mortgage servicing rights	1,178.0	1,124.0	$ 910.0	$ 1,148.0
Junior subordinated debt	64.0	63.0
Cumulative basis adjustment including carrying value of hedged items	(66.0)	(6.0)
Commercial MBS issued by GSEs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities	586.0	530.0
Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities	367.0	367.0
Private label residential MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities	1,091.0	1,117.0
Residential MBS issued by GSEs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities	4,536.0	1,972.0
CLO
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities		1,399.0
Tax-exempt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities	849.0	858.0
U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities	7,011.0	4,853.0
Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities	69.0	69.0
CRA investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity	25.0	26.0
Preferred Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity	105.0	100.0
Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities	14,509.0	11,165.0
Investment securities - equity	130.0	126.0
Loans HFS	1,812.0	1,380.0
Fair value of mortgage servicing rights	1,178.0	1,124.0
Derivative asset	133.0	88.0
Derivative liabilities	53.0	100.0
Fair Value, Recurring | Commercial MBS issued by GSEs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities	586.0	530.0
Fair Value, Recurring | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities	367.0	367.0
Fair Value, Recurring | Private label residential MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities	1,091.0	1,117.0
Fair Value, Recurring | Residential MBS issued by GSEs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities	4,536.0	1,972.0
Fair Value, Recurring | CLO
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities		1,399.0
Fair Value, Recurring | Tax-exempt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities	849.0	858.0
Fair Value, Recurring | U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities	7,011.0	4,853.0
Fair Value, Recurring | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities	69.0	69.0
Fair Value, Recurring | CRA investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity	25.0	26.0
Fair Value, Recurring | Preferred Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity	105.0	100.0
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities	7,039.0	4,881.0
Investment securities - equity	130.0	126.0
Loans HFS	0.0	0.0
Fair value of mortgage servicing rights	0.0	0.0
Derivative asset	0.0	0.0
Junior subordinated debt	0.0	0.0
Derivative liabilities	0.0	0.0
Margin, asset	139.0	202.0
Margin, liability	8.0	(9.0)
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial MBS issued by GSEs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities	0.0	0.0
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities	0.0	0.0
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Private label residential MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities	0.0	0.0
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Residential MBS issued by GSEs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities	0.0	0.0
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | CLO
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities		0.0
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Tax-exempt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities	0.0	0.0
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities	7,011.0	4,853.0
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities	28.0	28.0
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | CRA investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity	25.0	26.0
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Preferred Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity	105.0	100.0
Fair Value, Recurring | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities	7,470.0	6,284.0
Investment securities - equity	0.0	0.0
Loans HFS	1,809.0	1,377.0
Fair value of mortgage servicing rights	0.0	0.0
Derivative asset	105.0	66.0
Junior subordinated debt	0.0	0.0
Derivative liabilities	52.0	100.0
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Commercial MBS issued by GSEs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities	586.0	530.0
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities	367.0	367.0
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Private label residential MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities	1,091.0	1,117.0
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Residential MBS issued by GSEs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities	4,536.0	1,972.0
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | CLO
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities		1,399.0
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Tax-exempt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities	849.0	858.0
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities	0.0	0.0
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities	41.0	41.0
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | CRA investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity	0.0	0.0
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Preferred Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity	0.0	0.0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities	0.0	0.0
Investment securities - equity	0.0	0.0
Loans HFS	3.0	3.0
Fair value of mortgage servicing rights	1,178.0	1,124.0
Derivative asset	28.0	22.0
Junior subordinated debt	64.0	63.0
Derivative liabilities	1.0	0.0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Commercial MBS issued by GSEs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities	0.0	0.0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities	0.0	0.0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Private label residential MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities	0.0	0.0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Residential MBS issued by GSEs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities	0.0	0.0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | CLO
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities		0.0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Tax-exempt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities	0.0	0.0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities	0.0	0.0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS debt securities	0.0	0.0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | CRA investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity	0.0	0.0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Preferred Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity	$ 0.0	$ 0.0

XML

Fair Value Accounting - Change in Level 3 Liabilities Measured at Fair Value on Recurring Basis (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Changes included in OCI, net of tax	$ (0.5)	$ (1.1)
Junior subordinated debt	64.0		$ 63.0
Mark to market adjustments	0.0	3.0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Junior subordinated debt	64.0		$ 63.0
Junior Subordinated Debt
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Change in fair value	$ (0.7)	(1.5)
Debt Instrument, measurement input	0.0873		0.0892
Junior Subordinated Debt | Significant Unobservable Inputs (Level 3)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Junior subordinated debt	$ 64.0		$ 63.0
Junior Subordinated Debt | Fair Value, Recurring
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	(62.8)	(62.5)
Ending balance	$ (63.5)	$ (64.0)

XML

Fair Value Accounting - Change in Level 3 Assets Unobservable Inputs (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Mark to market adjustments	$ 0.0	$ 3.0
Servicing Contracts
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	1,124.0	1,148.0
Purchases and additions	189.0	142.0
Sales and payments	(156.0)	(350.0)
Change in fair value	60.0	(8.0)
Realization of cash flows	(39.0)	(25.0)
Balance, end of period	1,178.0	910.0
Change in unrealized gains for the period	46.0	(3.0)
Interest rate lock commitments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	18.0	2.0
Purchases and additions	4,060.0	2,946.0
Settlement of IRLCs upon acquisition or origination of loans HFS	(4,067.0)	(2,935.0)
Change in fair value	(1.0)	1.0
Balance, end of period	10.0	14.0
Change in unrealized gains for the period	$ 10.0	$ 14.0

XML

Fair Value Accounting - Unobservable Inputs (Details) $ in Millions	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Fair Value, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans HFI	$ 441	$ 379
Other assets acquired through foreclosure	8	8
Fair Value, Nonrecurring | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans HFI	441	379
Other assets acquired through foreclosure	$ 8	$ 8
Minimum | Third party appraisal | Fair Value, Nonrecurring | Significant Unobservable Inputs (Level 3) | Loans and Finance Receivables | Valuation Technique, Collateral Method
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans HFI, measurement input	6.00%	6.00%
Minimum | Third party appraisal | Fair Value, Nonrecurring | Significant Unobservable Inputs (Level 3) | Other Assets | Valuation Technique, Collateral Method
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets acquired through foreclosure, measurement input	4.00%	4.00%
Minimum | Discount rate | Fair Value, Nonrecurring | Significant Unobservable Inputs (Level 3) | Loans and Finance Receivables | Valuation Technique, Discounted Cash Flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans HFI, measurement input	3.00%	3.00%
Minimum | Scheduled cash collections | Fair Value, Nonrecurring | Significant Unobservable Inputs (Level 3) | Loans and Finance Receivables | Valuation Technique, Discounted Cash Flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans HFI, measurement input	0.00%	0.00%
Minimum | Proceeds from non-real estate collateral | Fair Value, Nonrecurring | Significant Unobservable Inputs (Level 3) | Loans and Finance Receivables | Valuation Technique, Discounted Cash Flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans HFI, measurement input	0.00%	0.00%
Minimum | Option Adjusted Spread
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing asset, measurement input	(0.0043)	0.0029
Minimum | Conditional Prepayment Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing asset, measurement input	0.091	0.095
Minimum | Recapture Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing asset, measurement input	0.200	0.200
Minimum | Servicing Fee Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing asset, measurement input	0.00250	0.00250
Minimum | Cost to Service
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing asset, measurement input	75	93
Minimum | Servicing Fee Multiple
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, measurement input	3.5	3.2
Minimum | Pull-through Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, measurement input	0.68	0.68
Maximum | Third party appraisal | Fair Value, Nonrecurring | Significant Unobservable Inputs (Level 3) | Loans and Finance Receivables | Valuation Technique, Collateral Method
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans HFI, measurement input	10.00%	10.00%
Maximum | Third party appraisal | Fair Value, Nonrecurring | Significant Unobservable Inputs (Level 3) | Other Assets | Valuation Technique, Collateral Method
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets acquired through foreclosure, measurement input	10.00%	10.00%
Maximum | Discount rate | Fair Value, Nonrecurring | Significant Unobservable Inputs (Level 3) | Loans and Finance Receivables | Valuation Technique, Discounted Cash Flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans HFI, measurement input	8.00%	8.00%
Maximum | Scheduled cash collections | Fair Value, Nonrecurring | Significant Unobservable Inputs (Level 3) | Loans and Finance Receivables | Valuation Technique, Discounted Cash Flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans HFI, measurement input	20.00%	20.00%
Maximum | Proceeds from non-real estate collateral | Fair Value, Nonrecurring | Significant Unobservable Inputs (Level 3) | Loans and Finance Receivables | Valuation Technique, Discounted Cash Flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans HFI, measurement input	70.00%	70.00%
Maximum | Option Adjusted Spread
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing asset, measurement input	0.0297	0.0253
Maximum | Conditional Prepayment Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing asset, measurement input	0.220	0.239
Maximum | Recapture Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing asset, measurement input	0.200	0.200
Maximum | Servicing Fee Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing asset, measurement input	0.00565	0.00565
Maximum | Cost to Service
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing asset, measurement input	95	100
Maximum | Servicing Fee Multiple
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, measurement input	5.7	5.4
Maximum | Pull-through Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, measurement input	1	1
Weighted Average | Option Adjusted Spread
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing asset, measurement input	0.0213	0.0213
Weighted Average | Conditional Prepayment Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing asset, measurement input	0.161	0.174
Weighted Average | Recapture Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing asset, measurement input	0.20	0.200
Weighted Average | Servicing Fee Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing asset, measurement input	0.00384	0.00356
Weighted Average | Cost to Service
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing asset, measurement input	86	95
Weighted Average | Servicing Fee Multiple
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, measurement input	4.6	4.3
Weighted Average | Pull-through Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, measurement input	0.86	0.89

XML

Fair Value Accounting - Aggregate Difference Between Fair Value and UPB for Fair Value Option Loans (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, option, loans held as assets, current through 89 days	$ 1,812	$ 1,379
UPB, option, loans held as assets, current through 89 days	1,755	1,319
Fair value, option, loans held as assets, current through 89 days, aggregate difference	57	60
Fair Value, 90 days or more delinquent	0	1
UPB, op days or more delinquent	0	2
Aggregated difference, 90 days or more delinquent	0	(1)
Loans held-for-sale, fair value	1,812	1,380
Fair value option, aggregate difference	57	59
Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing receivable, UPB	$ 1,755	$ 1,321

XML

Fair Value Accounting - Assets Measured at Fair Value on Nonrecurring Basis (Detail) - Fair Value, Nonrecurring - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans HFI	$ 441	$ 379
Other assets acquired through foreclosure	8	8
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans HFI	0	0
Other assets acquired through foreclosure	0	0
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans HFI	0	0
Other assets acquired through foreclosure	0	0
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans HFI	441	379
Other assets acquired through foreclosure	$ 8	$ 8

XML

Fair Value Accounting - Estimated Fair Value of Financial Instruments (Detail) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Financial assets
HTM	$ 1,461	$ 1,429
AFS	14,509	11,165
Investment securities - equity	130	126
Loans HFS	1,841	1,402
Net loans HFI	50,360	49,960
Mortgage servicing rights	1,178	1,124
Accrued interest receivable	5	5
Financial liabilities
Total deposits	62,228	55,333
Other borrowings	6,221	7,230
Junior subordinated debt	64	63
Fair Value, Nonrecurring | Carrying Amount
Financial assets
HTM	1,461	1,429
Net loans HFI	50,360	49,960
Accrued interest receivable	360	370
Financial liabilities
Total deposits	62,228	55,333
Other borrowings	6,221	7,230
Junior subordinated debt	896	895
Accrued interest payable	168	151
Fair Value, Nonrecurring | Estimate of Fair Value Measurement
Financial assets
HTM	1,253	1,251
Net loans HFI	47,245	46,877
Accrued interest receivable	360	370
Financial liabilities
Total deposits	62,263	55,379
Other borrowings	6,184	7,192
Junior subordinated debt	811	810
Accrued interest payable	168	151
Fair Value, Nonrecurring | Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets
HTM	0	0
Net loans HFI	0	0
Accrued interest receivable	0	0
Financial liabilities
Total deposits	0	0
Other borrowings	0	0
Junior subordinated debt	0	0
Accrued interest payable	0	0
Fair Value, Nonrecurring | Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2)
Financial assets
HTM	1,253	1,251
Net loans HFI	0	0
Accrued interest receivable	360	370
Financial liabilities
Total deposits	62,263	55,379
Other borrowings	6,184	7,192
Junior subordinated debt	734	734
Accrued interest payable	168	151
Fair Value, Nonrecurring | Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3)
Financial assets
HTM	0	0
Net loans HFI	47,245	46,877
Accrued interest receivable	0	0
Financial liabilities
Total deposits	0	0
Other borrowings	0	0
Junior subordinated debt	77	76
Accrued interest payable	0	0
Fair Value, Recurring
Financial assets
AFS	14,509	11,165
Investment securities - equity	130	126
Derivative asset	133	88
Financial liabilities
Derivative liabilities	53	100
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets
AFS	7,039	4,881
Investment securities - equity	130	126
Derivative asset	0	0
Financial liabilities
Junior subordinated debt	0	0
Derivative liabilities	0	0
Fair Value, Recurring | Significant Other Observable Inputs (Level 2)
Financial assets
AFS	7,470	6,284
Investment securities - equity	0	0
Derivative asset	105	66
Financial liabilities
Junior subordinated debt	0	0
Derivative liabilities	52	100
Fair Value, Recurring | Significant Unobservable Inputs (Level 3)
Financial assets
AFS	0	0
Investment securities - equity	0	0
Derivative asset	28	22
Financial liabilities
Junior subordinated debt	64	63
Derivative liabilities	1	0
Fair Value, Recurring | Carrying Amount
Financial assets
AFS	14,509	11,165
Investment securities - equity	130	126
Derivative asset	133	84
Loans HFS	1,841	1,402
Mortgage servicing rights	1,178	1,124
Financial liabilities
Derivative liabilities	53	100
Fair Value, Recurring | Estimate of Fair Value Measurement
Financial assets
AFS	14,509	11,165
Investment securities - equity	130	126
Derivative asset	133	84
Loans HFS	1,841	1,402
Mortgage servicing rights	1,178	1,124
Financial liabilities
Derivative liabilities	53	100
Fair Value, Recurring | Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets
AFS	7,039	4,881
Investment securities - equity	130	126
Derivative asset	0	0
Loans HFS	0	0
Mortgage servicing rights	0	0
Financial liabilities
Derivative liabilities	0	0
Fair Value, Recurring | Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2)
Financial assets
AFS	7,470	6,284
Investment securities - equity	0	0
Derivative asset	105	66
Loans HFS	1,818	1,379
Mortgage servicing rights	0	0
Financial liabilities
Derivative liabilities	52	100
Fair Value, Recurring | Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3)
Financial assets
AFS	0	0
Investment securities - equity	0	0
Derivative asset	28	18
Loans HFS	23	23
Mortgage servicing rights	1,178	1,124
Financial liabilities
Derivative liabilities	$ 1	$ 0

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Fair Value Accounting - Additional Information (Detail)	3 Months Ended	12 Months Ended
	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	$ 14,509,000,000	$ 11,165,000,000
Commitments and contingencies (Note 14)
U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	7,011,000,000	4,853,000,000
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans with an allowance recorded	$ 3,000,000	$ 10,000,000
Junior Subordinated Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, measurement input	0.0873	0.0892
Percentage of LIBOR	5.30%	5.33%
Period of basis point spread	3.43%	3.59%
Fair Value, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans HFI	$ 441,000,000	$ 379,000,000
Other assets acquired through foreclosure	8,000,000	8,000,000
Fair Value, Nonrecurring | Letter of Credit | Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commitments and contingencies (Note 14)	0	0
Fair Value, Nonrecurring | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans HFI	441,000,000	379,000,000
Other assets acquired through foreclosure	8,000,000	8,000,000
Fair Value, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans HFI	0	0
Other assets acquired through foreclosure	0	0
Fair Value, Nonrecurring | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans HFI	0	0
Other assets acquired through foreclosure	0	0
Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	14,509,000,000	11,165,000,000
Fair Value, Recurring | Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	14,509,000,000	11,165,000,000
Fair Value, Recurring | U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	7,011,000,000	4,853,000,000
Fair Value, Recurring | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	0	0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	0	0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	0	0
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	7,039,000,000	4,881,000,000
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	7,039,000,000	4,881,000,000
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	7,011,000,000	4,853,000,000
Fair Value, Recurring | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	7,470,000,000	6,284,000,000
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	7,470,000,000	6,284,000,000
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	$ 0	$ 0

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Segments - Operating Segment Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($) Reportable_Business_Segments	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Operating Statistics [Line Items]
Reportable segments | Reportable_Business_Segments	3
Goodwill weighting assigned	100.00%
Cash, cash equivalents, and investments	$ 19,890.0		$ 14,569.0
Loans HFS	1,841.0		1,402.0
Loans HFI, net of deferred fees and costs	50,700.0		50,297.0
Less: allowance for credit losses	(340.3)	$ (304.7)	(336.7)	$ (309.7)
Net loans HFI	50,360.0		49,960.0
Other assets acquired through foreclosure, net	8.0		8.0
Goodwill and intangible assets, net	666.0		669.0
Other assets	4,224.0		4,254.0
Total assets	76,989.0		70,862.0
Total deposits	62,228.0		55,333.0
Borrowings and qualifying debt	7,117.0		8,125.0
Other liabilities	1,472.0		1,326.0
Total liabilities	70,817.0		64,784.0
Allocated equity:	6,172.5	5,520.5	6,078.4	$ 5,356.0
Total liabilities and stockholders' equity	76,989.0		70,862.0
Excess funds provided (used)	0.0		0.0
Net interest income	598.9	609.9
Provision for (recovery of) credit losses	15.2	19.4
Net interest income after provision for credit losses	583.7	590.5
Non-interest income	129.9	(58.0)
Non-interest expense	481.8	347.9
Income before provision for income taxes	231.8	184.6
Income tax expense (benefit)	54.4	42.4
Net income	$ 177.4	142.2
Minimum
Operating Statistics [Line Items]
Equity capital weighting assigned	0.00%
Maximum
Operating Statistics [Line Items]
Equity capital weighting assigned	20.00%
Operating Segments | Commercial Segment
Operating Statistics [Line Items]
Cash, cash equivalents, and investments	$ 12.0		13.0
Loans HFS	0.0		0.0
Loans HFI, net of deferred fees and costs	29,642.0		29,136.0
Less: allowance for credit losses	(287.0)		(284.0)
Net loans HFI	29,355.0		28,852.0
Other assets acquired through foreclosure, net	8.0		8.0
Goodwill and intangible assets, net	291.0		292.0
Other assets	414.0		390.0
Total assets	30,080.0		29,555.0
Total deposits	25,146.0		23,897.0
Borrowings and qualifying debt	9.0		7.0
Other liabilities	139.0		109.0
Total liabilities	25,294.0		24,013.0
Allocated equity:	2,590.0		2,555.0
Total liabilities and stockholders' equity	27,884.0		26,568.0
Excess funds provided (used)	(2,196.0)		(2,987.0)
Net interest income	288.8	389.4
Provision for (recovery of) credit losses	15.3	(2.7)
Net interest income after provision for credit losses	273.5	392.1
Non-interest income	26.1	(96.7)
Non-interest expense	156.0	136.0
Income before provision for income taxes	143.6	159.4
Income tax expense (benefit)	33.7	38.5
Net income	109.9	120.9
Operating Segments | Consumer Related Segment
Operating Statistics [Line Items]
Cash, cash equivalents, and investments	0.0		125.0
Loans HFS	1,841.0		1,402.0
Loans HFI, net of deferred fees and costs	21,058.0		21,161.0
Less: allowance for credit losses	(53.0)		(53.0)
Net loans HFI	21,005.0		21,108.0
Other assets acquired through foreclosure, net	0.0		0.0
Goodwill and intangible assets, net	375.0		377.0
Other assets	1,961.0		1,826.0
Total assets	25,182.0		24,838.0
Total deposits	30,481.0		24,925.0
Borrowings and qualifying debt	21.0		402.0
Other liabilities	421.0		338.0
Total liabilities	30,923.0		25,665.0
Allocated equity:	1,814.0		1,790.0
Total liabilities and stockholders' equity	32,737.0		27,455.0
Excess funds provided (used)	7,555.0		2,617.0
Net interest income	292.6	199.3
Provision for (recovery of) credit losses	(0.4)	1.5
Net interest income after provision for credit losses	293.0	197.8
Non-interest income	95.7	51.0
Non-interest expense	295.9	192.0
Income before provision for income taxes	92.8	56.8
Income tax expense (benefit)	21.8	12.8
Net income	71.0	44.0
Corporate & Other | Corporate And Other Segment
Operating Statistics [Line Items]
Cash, cash equivalents, and investments	19,878.0		14,431.0
Loans HFS	0.0		0.0
Loans HFI, net of deferred fees and costs	0.0		0.0
Less: allowance for credit losses	0.0		0.0
Net loans HFI	0.0		0.0
Other assets acquired through foreclosure, net	0.0		0.0
Goodwill and intangible assets, net	0.0		0.0
Other assets	1,849.0		2,038.0
Total assets	21,727.0		16,469.0
Total deposits	6,601.0		6,511.0
Borrowings and qualifying debt	7,087.0		7,716.0
Other liabilities	912.0		879.0
Total liabilities	14,600.0		15,106.0
Allocated equity:	1,768.0		1,733.0
Total liabilities and stockholders' equity	16,368.0		16,839.0
Excess funds provided (used)	(5,359.0)		$ 370.0
Net interest income	17.5	21.2
Provision for (recovery of) credit losses	0.3	20.6
Net interest income after provision for credit losses	17.2	0.6
Non-interest income	8.1	(12.3)
Non-interest expense	29.9	19.9
Income before provision for income taxes	(4.6)	(31.6)
Income tax expense (benefit)	(1.1)	(8.9)
Net income	$ (3.5)	$ (22.7)

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Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Revenue from Contract with Customer [Abstract]
Revenue	$ 13.5	$ 14.0