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, 2022

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 25, 2022, Western Alliance Bancorporation had 108,282,445 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	67
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	88
Item 4.	Controls and Procedures	90
PART II. OTHER INFORMATION
Item 1.	Legal Proceedings	90
Item 1A.	Risk Factors	91
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	91
Item 5.	Other Information	91
Item 6.	Exhibits	92
SIGNATURES		93

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	LVSP	Las Vegas Sunset Properties
Aris	Aris Mortgage Holding 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
TERMS:
AFS	Available-for-Sale	HELOC	Home Equity Line of Credit
ALCO	Asset and Liability Management Committee	HFI	Held for Investment
AOCI	Accumulated Other Comprehensive Income	HFS	Held for Sale
APIC	Additional paid in capital	HTM	Held-to-Maturity
ASC	Accounting Standards Codification	HUD	U.S. Department of Housing and Urban Development
ASU	Accounting Standards Update	ICS	Insured Cash Sweep Service
Basel III	Banking Supervision's December 2010 final capital framework	IRC	Internal Revenue Code
BOD	Board of Directors	IRLC	Interest Rate Lock Commitment
Capital Rules	The FRB, the OCC, and the FDIC 2013 Approved Final Rules	ISDA	International Swaps and Derivatives Association
CARES Act	Coronavirus Aid, Relief and Economic Security Act	LGD	Loss Given Default
CBOE	Chicago Board Options Exchange	LIBOR	London Interbank Offered Rate
CDARS	Certificate Deposit Account Registry Service	LIHTC	Low-Income Housing Tax Credit
CECL	Current Expected Credit Losses	MBS	Mortgage-Backed Securities
CEO	Chief Executive Officer	MSA	Metropolitan Statistical Area
CET1	Common Equity Tier 1	MSR	Mortgage Servicing Right
CFO	Chief Financial Officer	NOL	Net Operating Loss
CFPB	Consumer Financial Protection Bureau	NPV	Net Present Value
CLO	Collateralized Loan Obligation	NYSE	New York Stock Exchange
COVID-19	Coronavirus Disease 2019	OCI	Other Comprehensive Income
CRA	Community Reinvestment Act	OREO	Other Real Estate Owned
CRE	Commercial Real Estate	OTTI	Other-than-Temporary Impairment
DTA	Deferred Tax Asset	PCD	Purchased Credit Deteriorated
EAD	Exposure at Default	PD	Probability of Default
EBO	Early buyout	PPNR	Pre-Provision Net Revenue
EPS	Earnings per share	PPP	Paycheck Protection Program
EVE	Economic Value of Equity	ROU	Right of use
Exchange Act	Securities Exchange Act of 1934, as amended	SBA	Small Business Administration
FASB	Financial Accounting Standards Board	SBIC	Small Business Investment Company
FDIC	Federal Deposit Insurance Corporation	SEC	Securities and Exchange Commission
FHA	Federal Housing Administration	SERP	Supplemental Executive Retirement Plan
FHLB	Federal Home Loan Bank	SOFR	Secured Overnight Financing Rate
FHLMC	Federal Home Loan Mortgage Corporation	SR	Supervision and Regulation Letters
FICO	The Financing Corporation	TDR	Troubled Debt Restructuring
FNMA	Federal National Mortgage Association	TEB	Tax Equivalent Basis
FOMC	Federal Open Market Committee	TSR	Total Shareholder Return
FRB	Federal Reserve Bank	UPB	Unpaid Principal Balance
FTC	Federal Trade Commission	USDA	United States Department of Agriculture
FVO	Fair Value Option	VA	Veterans Affairs
GAAP	U.S. Generally Accepted Accounting Principles	VIE	Variable Interest Entity
GNMA	Government National Mortgage Association	XBRL	eXtensible Business Reporting Language
GSE	Government-Sponsored Enterprise

3

Item 1.Financial Statements

WESTERN ALLIANCE BANCORPORATION AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

	March 31, 2022		December 31, 2021
	(Unaudited)
	(in millions, except shares and per share amounts)
Assets:
Cash and due from banks	$	266.5	$	166.2
Interest-bearing deposits in other financial institutions	2,335.8		350.2
Cash, cash equivalents and restricted cash	2,602.3		516.4
Investment securities - AFS, at fair value; amortized cost of $7,165.5 at March 31, 2022 and $6,166.5 at December 31, 2021	6,852.2		6,188.8
Investment securities - HTM, at amortized cost and net of allowance for credit losses of $3.2 and $5.2 (fair value of $1,139.9 and $1,146.4) at March 31, 2022 and December 31, 2021, respectively	1,157.8		1,101.9
Investment securities - equity	164.7		158.5
Investments in restricted stock, at cost	101.9		91.7
Loans HFS	4,761.6		5,635.1
Loans HFI, net of deferred loan fees and costs	41,119.1		39,075.4
Less: allowance for credit losses	(257.6)		(252.5)
Net loans held for investment	40,861.5		38,822.9
Mortgage servicing rights	950.3		698.0
Premises and equipment, net	196.3		181.9
Operating lease right of use asset	141.8		133.0
Bank owned life insurance	178.9		180.2
Goodwill and intangible assets, net	698.2		634.8
Deferred tax assets, net	67.6		20.9
Investments in LIHTC and renewable energy	729.9		631.3
Other assets	1,111.1		987.2
Total assets	$	60,576.1	$	55,982.6
Liabilities:
Deposits:
Non-interest-bearing demand	$	23,520.4	$	21,353.4
Interest-bearing	28,639.1		26,258.6
Total deposits	52,159.5		47,612.0
Other borrowings	833.3		1,501.9
Qualifying debt	893.3		895.8
Operating lease liability	154.9		142.8
Other liabilities	1,523.5		867.5
Total liabilities	55,564.5		51,020.0
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 issued and outstanding at March 31, 2022 and December 31, 2021)	294.5		294.5
Common stock (par value $0.0001; 200,000,000 authorized; 110,824,061 shares issued at March 31, 2022 and 108,981,341 at December 31, 2021) and additional paid in capital	2,083.7		1,966.2
Treasury stock, at cost (2,535,555 shares at March 31, 2022 and 2,350,021 shares at December 31, 2021)	(104.1)		(86.8)
Accumulated other comprehensive (loss) income	(235.1)		15.7
Retained earnings	2,972.6		2,773.0
Total stockholders’ equity	5,011.6		4,962.6
Total liabilities and stockholders’ equity	$	60,576.1	$	55,982.6

See accompanying Notes to Unaudited Consolidated Financial Statements.

4

WESTERN ALLIANCE BANCORPORATION AND SUBSIDIARIES

CONSOLIDATED INCOME STATEMENTS

	Three Months Ended March 31,
	2022		2021
	(in millions, except per share amounts)
Interest income:
Loans, including fees	$	434.7	$	298.4
Investment securities	46.7		32.8
Dividends and other	3.1		2.9
Total interest income	484.5		334.1
Interest expense:
Deposits	14.1		10.8
Qualifying debt	8.4		5.9
Other borrowings	12.5		0.1
Total interest expense	35.0		16.8
Net interest income	449.5		317.3
Provision for (recovery of) credit losses	9.0		(32.4)
Net interest income after provision for (recovery of) credit losses	440.5		349.7
Non-interest income:
Net loan servicing revenue	41.1		—
Net gain on loan origination and sale activities	36.9		—
Service charges and fees	7.0		6.7
Gain on sales of investment securities	6.9		0.1
Commercial banking related income	5.1		3.4
Income from equity investments	4.1		7.6
Gain on recovery from credit guarantees	2.3		—
Fair value loss on assets measured at fair value, net	(6.6)		(1.5)
Other income	9.5		3.4
Total non-interest income	106.3		19.7
Non-interest expense:
Salaries and employee benefits	138.3		83.7
Legal, professional, and directors' fees	24.0		10.1
Data processing	17.6		9.9
Occupancy	12.8		8.6
Loan servicing expenses	10.8		—
Deposit costs	9.3		6.3
Insurance	7.2		4.2
Loan acquisition and origination expenses	6.5		—
Business development and marketing	4.4		1.4
Net loss (gain) on sales and valuations of repossessed and other assets	0.1		(0.3)
Acquisition and restructure expenses	0.4		0.4
Other expense	17.2		10.7
Total non-interest expense	248.6		135.0
Income before provision for income taxes	298.2		234.4
Income tax expense	58.1		41.9
Net income	240.1		192.5
Dividends on preferred stock	3.2		—
Net income available to common stockholders	$	236.9	$	192.5
Earnings per share:
Basic	$	2.23	$	1.91
Diluted	2.22		1.90
Weighted average number of common shares outstanding:
Basic	106.0		100.8
Diluted	106.6		101.4
Dividends declared per common share	$	0.35	$	0.25

See accompanying Notes to Unaudited Consolidated Financial Statements.

5

WESTERN ALLIANCE BANCORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

	Three Months Ended March 31,
	2022		2021
	(in millions)
Net income	$	240.1	$	192.5
Other comprehensive income (loss), net:
Unrealized loss on AFS securities, net of tax effect of $80.8 and $23.5, respectively	(247.9)		(72.0)
Unrealized gain (loss) on junior subordinated debt, net of tax effect of $(0.7) and $0.1, respectively	2.2		(0.3)
Realized gain on sale of AFS securities included in income, net of tax effect of $1.8 and approximately $0.0, respectively	(5.1)		(0.1)
Net other comprehensive loss	(250.8)		(72.4)
Comprehensive (loss) income	$	(10.7)	$	120.1

See accompanying Notes to Unaudited Consolidated Financial Statements.

6

WESTERN ALLIANCE BANCORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

	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, 2020	—	$	—	100.8	$	—	$	1,390.9	$	(71.1)	$	92.3	$	2,001.4	$	3,413.5
Net income	—	—		—	—		—		—		—		192.5		192.5
Restricted stock, performance stock units, and other grants, net	—	—		0.5	—		8.1		—		—		—		8.1
Restricted stock surrendered (1)	—	—		(0.2)	—		—		(12.9)		—		—		(12.9)
Common stock issuance, net	—	—		2.3	—		209.2		—		—		—		209.2
Dividends paid to common stockholders	—	—		—	—		—		—		—		(25.3)		(25.3)
Other comprehensive loss, net	—	—		—	—		—		—		(72.4)		—		(72.4)
Balance, March 31, 2021	—	$	—	103.4	$	—	$	1,608.2	$	(84.0)	$	19.9	$	2,168.6	$	3,712.7
Balance, December 31, 2021	12.0	$	294.5	106.6	$	—	$	1,966.2	$	(86.8)	$	15.7	$	2,773.0	$	4,962.6
Net income	—	—		—	—		—		—		—		240.1		240.1
Restricted stock, performance stock units, and other grants, net	—	—		0.6	—		9.8		—		—		—		9.8
Restricted stock surrendered (1)	—	—		(0.2)	—		—		(17.3)		—		—		(17.3)
Common stock issuance, net	—	—		1.3	—		107.7		—		—		—		107.7
Dividends paid to preferred stockholders	—	—		—	—		—		—		—		(3.2)		(3.2)
Dividends paid to common stockholders	—	—		—	—		—		—		—		(37.3)		(37.3)
Other comprehensive loss, net	—	—		—	—		—		—		(250.8)		—		(250.8)
Balance, March 31, 2022	12.0	$	294.5	108.3	$	—	$	2,083.7	$	(104.1)	$	(235.1)	$	2,972.6	$	5,011.6

(1)Share amounts represent Treasury Shares, see "Note 1. Summary of Significant Accounting Policies" for further discussion.    

See accompanying Notes to Unaudited Consolidated Financial Statements.

7

WESTERN ALLIANCE BANCORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS

	Three Months Ended March 31,
	2022		2021
	(in millions)
Cash flows from operating activities:
Net income	$	240.1	$	192.5
Adjustments to reconcile net income to cash provided by operating activities:
Provision for (recovery of) credit losses	9.0		(32.4)
Depreciation and amortization	11.1		6.0
Stock-based compensation	9.8		8.0
Deferred income taxes	35.1		5.1
Amortization of net premiums for investment securities	6.9		10.7
Amortization of tax credit investments	13.4		15.5
Amortization of operating lease right of use asset	5.4		3.0
Amortization of net deferred loan fees and net purchase premiums	(12.5)		(19.2)
Purchases and originations of loans HFS	(13,060.0)		—
Proceeds from sales and payments on loans held for sale	13,663.0		—
Mortgage servicing rights capitalized upon sale of mortgage loans	(204.1)		—
Net (gains) losses on:
Change in fair value of loans HFS, mortgage servicing rights, and related derivatives	(55.4)		—
Other	0.5		0.8
Changes in other assets and liabilities, net	(39.4)		(89.9)
Net cash provided by operating activities	$	622.9	$	100.1
Cash flows from investing activities:
Investment securities - AFS
Purchases	$	(830.6)	$	(2,748.5)
Principal pay downs and maturities	257.1		493.6
Proceeds from sales	114.2		—
Investment securities - HTM
Purchases	(60.5)		(131.6)
Principal pay downs and maturities	6.7		0.7
Equity securities carried at fair value
Purchases	(4.7)		(28.3)
Redemptions	0.1		0.4
Proceeds from sales	—		0.6
Proceeds from sale of mortgage servicing rights and related holdbacks, net	24.1		—
Purchase of other investments	(66.1)		(24.3)
Net increase in loans HFI	(1,961.7)		(1,611.1)
Purchase of premises, equipment, and other assets, net	(26.2)		(10.4)
Cash consideration paid for acquisitions, net of cash acquired	(50.0)		—
Net cash used in investing activities	$	(2,597.6)	$	(4,058.9)
Cash flows from financing activities:
Net increase in deposits	$	4,547.5	$	6,462.6
Payments on long-term debt	(9.5)		—
Net decrease in short-term borrowings	(514.5)		(0.1)
Cash paid for tax withholding on vested restricted stock and other	(17.3)		(12.8)
Cash dividends paid on common stock and preferred stock	(40.5)		(25.3)
Proceeds from issuance of common stock in offerings, net	94.9		209.2
Net cash provided by financing activities	$	4,060.6	$	6,633.6
Net increase in cash, cash equivalents, and restricted cash	2,085.9		2,674.8
Cash, cash equivalents, and restricted cash at beginning of period	516.4		2,671.7
Cash, cash equivalents, and restricted cash at end of period	$	2,602.3	$	5,346.5

8

	Three Months Ended March 31,
	2022		2021
	(in millions)
Supplemental disclosure:
Cash paid during the period for:
Interest	$	25.9	$	15.0
Income taxes, net	24.2		30.8
Non-cash operating, investing, and financing activity:
Net increase in unfunded commitments and obligations	$	157.4	$	102.8
Net increase in unsettled loans HFI and investment securities purchased	569.1		168.5
Transfers of securitized LHFS to AFS securities	40.4		—

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 operation

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 blockchain-based 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 has added to its capabilities with the acquisition of DST on January 25, 2022, which provides digital payment services for the class action legal industry. In addition, the Company has two non-bank subsidiaries, which are LVSP, which held and managed certain OREO properties, and 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.

Basis of presentation

The accounting and reporting policies of the Company are in accordance with GAAP and conform to practices within the financial services industry. The accounts of the Company and its consolidated subsidiaries are included in the Consolidated Financial Statements.

Recent accounting pronouncements

Troubled Debt Restructurings and Vintage Disclosures

In March 2022, the FASB issued guidance within ASU 2022-02, Financial Instruments—Credit Losses (Topic 326). The amendments in this update eliminate the accounting guidance and related disclosures for TDRs by creditors in Subtopic 310-40, Receivables—Troubled Debt Restructurings by Creditors, while enhancing disclosure requirements for certain loan refinancings and restructurings by creditors when a borrower is experiencing financial difficulty and requiring an entity to disclose current-period gross writeoffs by year of origination for financing receivables and net investments in leases within the scope of Subtopic 326-20, Financial Instruments—Credit Losses—Measured at Amortized Cost.

The amendments in this update are effective for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years and are applied prospectively, except with respect to the recognition and measurement of TDRs, where an entity has the option to apply a modified retrospective transition method. Early adoption of the amendments in this update is permitted. An entity may elect to early adopt the amendments regarding TDRs and related disclosure enhancements separately from the amendments related to vintage disclosures. The adoption of this accounting guidance is not expected to have a material impact on the Company's Consolidated Financial Statements.

Recently adopted accounting guidance

Reference Rate Reform

In March 2020, the FASB issued guidance within ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting, in response to the scheduled discontinuation of LIBOR. Since the issuance of this guidance, the publication cessation of U.S. dollar LIBOR has been extended to June 30, 2023. The amendments in this update provide optional guidance designed to provide relief from the accounting analysis and impacts that may otherwise be required for modifications to agreements (e.g., loans, debt securities, derivatives, borrowings) necessitated by reference rate reform.

The following optional expedients for applying the requirements of certain ASC Topics or Industry Subtopics in the Codification are permitted for contracts that are modified because of reference rate reform and that meet certain scope guidance: 1) modifications of contracts within the scope of ASC Topics 310, Receivables, and 470, Debt, should be accounted for by prospectively adjusting the effective interest rate; 2) modifications of contracts within the scope of ASC Topic 842, Leases, should be accounted for as a continuation of the existing contracts with no reassessments of the lease classification and the discount rate or remeasurements of lease payments that otherwise would be required under this ASC Topic for modifications not accounted for as separate contracts; 3) modifications of contracts do not require an entity to reassess its original conclusion about whether that contract contains an embedded derivative that is clearly and closely related to the

10

economic characteristics and risks of the host contract under Subtopic ASC 815-15, Derivatives and Hedging- Embedded Derivatives; and 4) for other ASC Topics or Industry Subtopics in the Codification, the amendments in this update also include a general principle that permits an entity to consider contract modifications due to reference rate reform to be an event that does not require contract remeasurement at the modification date or reassessment of a previous accounting determination.

In January 2021, the FASB issued ASU 2021-01, Reference Rate Reform (Topic 848): Scope in order to clarify that certain optional expedients and exceptions in ASC Topic 848 apply to derivatives that are affected by the discounting transition. Specifically, certain provisions in ASC Topic 848, if elected by an entity, apply to derivative instruments that use an interest rate for margining, discount, or contract price alignment that is modified as a result of reference rate reform.

Due to the prospective nature of the revised guidance, the adoption of this accounting guidance did not have a material impact on the Company's Consolidated Financial Statements.

Convertible Debt and Derivatives and Hedging

In August 2020, the FASB issued guidance within ASU 2020-06, Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity’s Own Equity (Subtopic 815-40). The amendments in this update affect entities that issue convertible instruments and/or contracts indexed to and potentially settled in an entity’s own equity. This update simplifies the convertible accounting framework through elimination of the beneficial conversion and cash conversion accounting models for convertible instruments. It also amends the accounting for certain contracts in an entity’s own equity that are currently accounted for as derivatives because of specific settlement provisions. In addition, the new guidance modifies how particular convertible instruments and certain contracts that may be settled in cash or shares impact the diluted EPS computation. The Company adopted the amendments within ASU 2020-06 using the modified retrospective method. 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, particularly to the extent that economic conditions worsen or persist longer than expected in an adverse state, relate to: 1) the determination of the allowance for credit losses; 2) certain assets and liabilities carried at fair value; and 3) accounting for income taxes.

Principles of consolidation

As of March 31, 2022, 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 Mortgage.

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 have no effect on net income or stockholders’ equity as previously reported.

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Interim financial information

The accompanying Unaudited Consolidated Financial Statements as of and for the three months ended March 31, 2022 and 2021 have been prepared in condensed format and, therefore, do not include all of the information and footnotes required by GAAP for complete financial statements. These statements have been prepared on a basis that is substantially consistent with the accounting principles applied to the Company's audited Consolidated Financial Statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2021.

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. The interim financial information should be read in conjunction with the Company's audited Consolidated Financial Statements.

Business combinations

Business combinations are accounted for under the acquisition method of accounting in accordance with ASC 805, Business Combinations. Under the acquisition method, the acquiring entity in a business combination recognizes all of the acquired assets and assumed liabilities at their estimated fair values as of the date of acquisition. Any excess of the purchase price over the fair value of net assets and other identifiable intangible assets acquired is recorded as goodwill. To the extent the fair value of net assets acquired, including identified intangible assets, exceeds the purchase price, a bargain purchase gain is recognized. Assets acquired and liabilities assumed from contingencies are also recognized at fair value if the fair value can be determined during the measurement period. Results of operations of an acquired business are included in the Consolidated Income Statement from the date of acquisition. Acquisition-related costs, including conversion and restructuring charges, are expensed as incurred.

Investment securities

Investment securities include debt and equity securities. Debt securities may be classified as HTM, AFS, or trading. The appropriate classification is initially decided at the time of purchase. Securities classified as HTM are those debt securities that the Company has both the intent and ability to hold to maturity regardless of changes in market conditions, liquidity needs, or general economic conditions. The sale of an HTM security within three months of its maturity date or after the majority of the principal outstanding has been collected is considered a maturity for purposes of classification and disclosure. Securities classified as AFS are debt securities that the Company intends to hold for an indefinite period of time, but not necessarily to maturity. Any decision to sell a security classified as AFS would be based on various factors, including significant movements in interest rates, changes in the maturity mix of the Company’s assets and liabilities, liquidity needs, decline in credit quality, and regulatory capital considerations.

HTM securities are carried at amortized cost. AFS securities are carried at their estimated fair value, with unrealized holding gains and losses reported in OCI, net of tax. When AFS debt securities are sold, the unrealized gains or losses are reclassified from OCI to non-interest income. Trading securities are carried at their estimated fair value, with changes in fair value reported in earnings as part of non-interest income.

Equity securities are carried at their estimated fair value, with changes in fair value reported in earnings as part of non-interest income.

Interest income is recognized based on the coupon rate and includes the amortization of purchase premiums and the accretion of purchase discounts. Premiums and discounts on investment securities are generally amortized or accreted over the contractual life of the security using the interest method. For the Company's mortgage-backed securities, amortization or accretion of premiums or discounts are adjusted for anticipated prepayments. Gains and losses on the sale of investment securities are recorded on the trade date and determined using the specific identification method.

A debt security is placed on nonaccrual status at the time its principal or interest payments become 90 days past due. Interest accrued but not received for a security placed on nonaccrual is reversed against interest income.

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Allowance for credit losses on investment securities

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 Company measures expected credit losses on its HTM debt securities on a collective basis by major security type. The Company's HTM securities portfolio consists of low income housing tax-exempt bonds and private label residential MBS. Low income housing tax-exempt bonds share similar risk characteristics with the Company's CRE, non-owner occupied or construction and land loan pools, given the similarity in underlying assets or collateral. Accordingly, expected credit losses on HTM securities are estimated using the same models and approaches as these loan pools, which utilize risk parameters (probability of default, loss given default, and exposure at default) in the measurement of expected credit losses. The historical data used to estimate probability of default and severity of loss in the event of default is derived or obtained from internal and external sources and adjusted for the expected effects of reasonable and supportable forecasts over the expected lives of the securities on those historical losses. Accrued interest receivable on HTM securities, which is included in other assets on the Consolidated Balance Sheet, is excluded from the estimate of expected credit losses.

The credit loss model under ASC 326-30, applicable to AFS debt securities, requires recognition of credit losses through an allowance account with credit losses recognized once securities become impaired. For AFS debt securities, a decline in fair value due to credit loss results in recognition of an allowance for credit losses. Impairment may result from credit deterioration of the issuer or collateral underlying the security. An assessment to determine whether a decline in fair value resulted from a credit loss is performed at the individual security level. Among other factors, the Company considers: 1) the extent to which the fair value is less than the amortized cost basis; 2) the financial condition and near term prospects of the issuer, including consideration of relevant financial metrics or ratios of the issuer; 3) any adverse conditions related to an industry or geographic area of an issuer; 4) any changes to the rating of the security by a rating agency; and 5) any past due principal or interest payments from the issuer. If an assessment of the above factors indicates that a credit loss exists, the Company records an allowance for credit losses for the excess of the amortized cost basis over the present value of cash flows expected to be collected, limited to the amount that the security's fair value is less than its amortized cost basis. Subsequent changes in the allowance for credit losses are recorded as a provision for (or recovery of) credit loss expense. Interest accruals and amortization and accretion of premiums and discounts are suspended when the credit loss is recognized in earnings. Any interest received after the security has been placed on nonaccrual status is recognized on a cash basis. Accrued interest receivable on AFS debt securities, which is included in Other assets on the Consolidated Balance Sheet, is excluded from the estimate of expected credit losses.

For each AFS security in an unrealized loss position, the Company also considers: 1) its intent to retain the security until anticipated recovery of the security's fair value; and 2) whether it is more-likely-than not that the Company would be required to sell the security before recovery of its amortized cost basis. If either of the criteria regarding intent or requirement to sell is met, the debt security is written down to its fair value and the write-down is charged against the allowance for credit losses with any incremental impairment recorded in earnings.

Write-offs are made through reversal of the allowance for credit losses and a direct write-off of the amortized cost basis of the AFS security. The Company considers the following events to be indicators that a write-off should be taken: 1) bankruptcy of the issuer; 2) significant adverse event(s) affecting the issuer in which it is improbable for the issuer to make its remaining payments on the security; and 3) significant loss of value of the underlying collateral behind a security. Recoveries on debt securities, if any, are recorded in the period received.

Restricted stock

WAB is a member of the Federal Reserve System and, as part of its membership, is required to maintain stock in the FRB in a specified ratio to its capital. In addition, WAB is a member of the FHLB system and, accordingly, maintains an investment in the capital stock of the FHLB based on the borrowing capacity used. These investments are considered equity securities with no actively traded market. Therefore, the shares are considered restricted investment securities. These investments are carried at cost, which is equal to the value at which they may be redeemed. Dividend income received from the stock is reported in interest income. The Company conducts a periodic review and evaluation of its restricted stock to determine if any impairment exists. No impairment has been recorded to date.

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Loans held for sale

The Company began holding loans HFS in connection with the AmeriHome acquisition and continues to purchase and originate loans as part of its mortgage banking business. Loans HFS are reported at fair value or the lower of cost or fair value, depending on the acquisition source. The Company has elected to record loans purchased from correspondent sellers or originated directly to consumers at fair value to more timely reflect the Company's performance. Changes in fair value of loans HFS are reported in current period income as a component of Net gain on loan origination and sale activities in the Consolidated Income Statement. Alternatively, delinquent loans repurchased under the terms of the GNMA MBS program, referred to as EBO loans, are reported at the lower of cost or fair value. For EBO loans, the amount by which cost exceeds fair value is accounted for as a valuation allowance and any changes in the valuation allowance are included in Net gain on loan origination and sale activities in the Consolidated Income Statement.

The Company recognizes a transfer of loans as a sale when it surrenders control over the transferred loans. Control is considered to be surrendered when the transferred loans have been legally isolated from the Company, the transferee has the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred loans, and the Company does not maintain effective control over the transferred loans through either an agreement that entitles or obligates the Company to repurchase or redeem the loans before their maturity or the ability to unilaterally cause the holder to return loans. If the transfer of loans qualifies as a sale, the Company derecognizes such loans. If the transfer of loans does not qualify as a sale, the proceeds from the transfer are accounted for as secured borrowings.

Loan acquisition and origination fees on loans HFS consist of fees earned by the Company for purchasing and originating loans and are recognized at the time the loans are purchased or originated. These fees generally represent flat, per loan fee amounts and are included as part of Net gain on loan origination and sale activities in the Consolidated Income Statement.

Recognition of interest income on non-government guaranteed or insured loans HFS is suspended and accrued unpaid interest receivable is reversed against interest income when loans become 90 days delinquent or when recovery of income and principal becomes doubtful. Loans return to accrual status when the principal and interest become current and it is probable that the amounts are fully collectible. For government guaranteed or insured loans HFS that are 90 days delinquent, the Company continues to recognize interest income at the debenture rate for FHA loans and at the note rate for VA and USDA loans, adjusted for probability of default.

Loans held for investment

Loans that management has the intent and ability to hold for the foreseeable future or until maturity or payoff are reported at amortized cost. Amortized cost is the amount of unpaid principal, adjusted for unamortized net deferred fees and costs, premiums and discounts, and write-offs. In addition, the amortized cost of loans subject to a fair value hedge are adjusted for changes in value attributable to the effective portion of the hedged benchmark interest rate risk.

The Company may also purchase loans or acquire loans through a business combination. At the purchase or acquisition date, loans are evaluated to determine whether there has been more than insignificant credit deterioration since origination. Loans that have experienced more than insignificant credit deterioration since origination are referred to as PCD loans. In its evaluation of whether a loan has experienced more than insignificant deterioration in credit quality since origination, the Company takes into consideration loan grades, loan-to-values greater than policy limits, past due and nonaccrual status, and TDR loans. The Company may also consider external credit rating agency ratings for borrowers and for non-commercial loans, FICO score or band, probability of default levels, and number of times past due. The initial estimate of credit losses on PCD loans is added to the purchase price on the acquisition date to establish the initial amortized cost basis of the loan; accordingly, the initial recognition of expected credit losses has no impact on net income. When the initial measurement of expected credit losses on PCD loans are calculated on a pooled loan basis, the expected credit losses are allocated to each loan within the pool. Any difference between the initial amortized cost basis and the unpaid principal balance of the loan represents a noncredit discount or premium, which is accreted (or amortized) into interest income over the life of the loan. Subsequent changes to the allowance for credit losses on PCD loans are recorded through the provision for credit losses. For purchased loans that are not deemed to have experienced more than insignificant credit deterioration since origination, any discounts or premiums included in the purchase price are accreted (or amortized) over the contractual life of the individual loan. For additional information, see "Note 5. Loans, Leases and Allowance for Credit Losses" of these Notes to Unaudited Consolidated Financial Statements.

In applying the effective yield method to loans, the Company generally applies the contractual method whereby loan fees collected for the origination of loans less direct loan origination costs (net of deferred loan fees), as well as premiums and discounts and certain purchase accounting adjustments, are amortized over the contractual life of the loan through interest income. If a loan has scheduled payments, the amortization of the net deferred fee is calculated using the interest method over the contractual life of the loan. If a loan does not have scheduled payments, such as a line of credit, the net deferred loan fee is recognized as interest income on a straight-line basis over the contractual life of the loan commitment. Commitment fees based

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on a percentage of a customer’s unused line of credit and fees related to standby letters of credit are recognized over the commitment period. When loans are repaid, any remaining unamortized balances of premiums, discounts, or net deferred fees are recognized as interest income.

Nonaccrual loans

When a borrower discontinues making payments as contractually required by the note, the Company must determine whether it is appropriate to continue to accrue interest. The Company ceases accruing interest income when the loan has become delinquent by more than 90 days or when management determines that the full repayment of principal and collection of interest according to contractual terms is no longer likely. Past due status is based on the contractual terms of the loan. The Company may decide to continue to accrue interest on certain loans more than 90 days delinquent if the loans are well secured by collateral and in the process of collection.

For all HFI loan types, when a loan is placed on nonaccrual status, all interest accrued but uncollected is reversed against interest income in the period in which the status is changed, and the Company makes a loan-level decision to apply either the cash basis or cost recovery method. The Company may recognize income on a cash basis when a payment is received and only for those nonaccrual loans for which the collection of the remaining principal balance is not in doubt. Under the cost recovery method, subsequent payments received from the customer are applied to principal and generally no further interest income is recognized until the loan principal has been paid in full or until circumstances have changed such that payments are again consistently received as contractually required. Loans are returned to accrual status when all of the principal and interest amounts contractually due are brought current and future payments are reasonably assured.

Troubled Debt Restructured Loans

A TDR loan is a loan on which the Company, for reasons related to a borrower’s financial difficulties, grants a concession to the borrower that the Company would not otherwise consider. In order to determine whether a borrower is experiencing financial difficulty, an evaluation is performed to assess the probability that the borrower will be in payment default on any of its debt in the foreseeable future without the modification. The evaluation is performed in accordance with the Company's internal underwriting policy. The loan terms that may be modified or restructured due to a borrower’s financial situation include, but are not limited to, a reduction in the stated interest rate, an extension of the maturity or renewal of the loan at an interest rate below current market, a reduction in the face amount of the debt, a reduction in the accrued interest, or deferral of interest payments. A TDR loan may be returned to accrual status when the loan is brought current, has performed in accordance with the contractual restructured terms for a reasonable period of time (generally six months), and the ultimate collectability of the total contractual restructured principal and interest is no longer in doubt. Consistent with regulatory guidance, a TDR loan that is subsequently modified in another restructuring agreement but has shown sustained performance and classification as a TDR, will be removed from TDR status provided that the modified terms were market-based at the time of modification.

The CARES Act, signed into law on March 27, 2020, permitted financial institutions to suspend requirements under GAAP for loan modifications to borrowers affected by COVID-19 that would otherwise be characterized as TDRs and suspend any determination related thereto if (i) the loan modification was made between March 1, 2020 and December 31, 2020 and (ii) the applicable loan was not more than 30 days past due as of December 31, 2019. The Consolidated Appropriations Act, 2021, extended these provisions through January 1, 2022, which have now expired. In addition, federal bank regulatory authorities issued guidance to encourage financial institutions to make loan modifications for borrowers affected by COVID-19 and assured financial institutions that they will neither receive supervisory criticism for such prudent loan modifications, nor be required by examiners to automatically categorize COVID-19-related loan modifications as TDRs. The Company has been applying this guidance to qualifying loan modifications.

Credit quality indicators

Loans are regularly reviewed to assess credit quality indicators and to determine appropriate loan classification and grading in accordance with applicable bank regulations. The Company’s risk rating methodology assigns risk ratings ranging from 1 to 9, where a higher rating represents higher risk. The Company differentiates its loan segments based on shared risk characteristics for which expected credit losses are measured on a pool basis.

The nine risk rating categories can generally be described by the following groupings for loans:

"Pass" (grades 1 through 5): The Company has five pass risk ratings, which represent a level of credit quality that ranges from having no well-defined deficiency or weakness to some noted weakness; however, the risk of default on any loan classified as pass is expected to be remote. The five pass risk ratings are described below:

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Minimal risk. Consist of loans that are fully secured either with cash held in a deposit account at the Bank or by readily marketable securities with an acceptable margin based on the type of security pledged.

Low risk. Consist of loans with a high investment grade rating equivalent.

Modest risk. Consist of loans where the credit facility greatly exceeds all policy requirements or with policy exceptions that are appropriately mitigated. A secondary source of repayment is verified and considered sustainable. Collateral coverage on these loans is sufficient to fully cover the debt as a tertiary source of repayment. Debt of the borrower is low relative to borrower’s financial strength and ability to pay.

Average risk. Consist of loans where the credit facility meets or exceeds all policy requirements or with policy exceptions that are appropriately mitigated. A secondary source of repayment is available to service the debt. Collateral coverage is more than adequate to cover the debt. The borrower exhibits acceptable cash flow and moderate leverage.

Acceptable risk. Consist of loans with an acceptable primary source of repayment, but a less than preferable secondary source of repayment. Cash flow is adequate to service debt, but there is minimal excess cash flow. Leverage is moderate or high.

"Special mention" (grade 6): These are generally assets that possess potential weaknesses that warrant management's close attention. These loans may involve borrowers with adverse financial trends, higher debt-to-equity ratios, or weaker liquidity positions, but not to the degree of being considered a “problem loan” where risk of loss may be apparent. Loans in this category are usually performing as agreed, although there may be non-compliance with financial covenants.

"Substandard" (grade 7): These assets are characterized by well-defined credit weaknesses and carry the distinct possibility that the Company will sustain some loss if such weakness or deficiency is not corrected. All loans 90 days or more past due and all loans on nonaccrual status are considered at least "Substandard," unless extraordinary circumstances would suggest otherwise.

"Doubtful" (grade 8): These assets have all the weaknesses inherent in those classified as "Substandard" with the added characteristic that the weaknesses present make collection or liquidation in full, on the basis of currently existing facts, conditions and values, highly questionable and improbable, but because of certain known factors that may work to the advantage and strengthening of the asset (for example, capital injection, perfecting liens on additional collateral and refinancing plans), classification as an estimated loss is deferred until a more precise status may be determined. Due to the high probability of loss, loans classified as "Doubtful" are placed on nonaccrual status.

"Loss" (grade 9): These assets are considered uncollectible and having such little recoverable value that it is not practical to defer writing off the asset. This classification does not mean that the loan has absolutely no recovery or salvage value, but rather that it is not practicable or desirable to defer writing off the asset, even though partial recovery may be achieved in the future.

Allowance for credit losses on HFI loans

Credit risk is inherent in the business of extending loans and leases to borrowers and is continuously monitored by management and reflected within the allowance for credit losses. The allowance for credit losses is an estimate of life-of-loan losses for the Company's loans HFI. The allowance for credit losses is a valuation account that is deducted from the amortized cost basis of a loan to present the net amount expected to be collected on the loan. Accrued interest receivable on these loans, which is included in Other assets on the Consolidated Balance Sheet, is excluded from the estimate of expected credit losses. Expected recoveries of amounts previously written off and expected to be written off are included in the valuation account and may not exceed the aggregate of amounts previously written off and expected to be written off. The Company formally re-evaluates and establishes the appropriate level of the allowance for credit losses on a quarterly basis.

Determining the appropriateness of the allowance is complex and requires judgment by management about the effect of matters that are inherently uncertain. In future periods, evaluations of the overall loan portfolio or particular segments of the loan portfolio, in light of the factors and forecasts then prevailing, may result in significant changes in the allowance for credit losses and credit loss expense in those future periods. The allowance level is influenced by loan volumes, mix, loan performance metrics, asset quality characteristics, delinquency status, historical credit loss experience, and the inputs and assumptions in economic forecasts, such as macroeconomic inputs, length of reasonable and supportable forecast periods, and reversion methods. The methodology for estimating the amount of expected credit losses reported in the allowance for credit losses has two basic components: first, an asset-specific component involving individual loans that do not share similar risk characteristics with other loans and the measurement of expected credit losses for such individual loans and; second, a pooled component for estimated expected credit losses for loans that share similar risk characteristics.

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Loans that do not share risk characteristics with other loans

Loans that do not share risk characteristics with other loans are evaluated on an individual basis. Loans evaluated individually are not included in the collective evaluation. These loans consist of loans with unique features or loans that no longer share risk characteristics with other pooled loans. The process for determining whether a loan should be evaluated on an individual basis begins with determination of credit rating. With the exception of residential loans, all accruing loans graded substandard or worse with a total commitment of $1.0 million or more are assigned a reserve based on an individual evaluation. For these loans, the allowance is based primarily on the fair value of the underlying collateral, utilizing independent third-party appraisals.

Loans that share similar risk characteristics with other loans

In estimating the component of the allowance for credit losses for loans that share similar risk characteristics with other loans, such loans are segregated into loan segments. The Company's primary portfolio segments align with the methodology applied in estimating the allowance for credit losses under CECL. Loans are designated into loan segments based on loans pooled by product types, business lines, and similar risk characteristics or areas of risk concentration.

In determining the allowance for credit losses, the Company derives an estimate of expected credit losses primarily using an expected loss methodology that incorporates risk parameters (probability of default, loss given default, and exposure at default), which are derived from various vendor models, internally-developed statistical models, or non-statistical estimation approaches. Probability of default is projected in these models or estimation approaches using a single economic scenario and were developed to incorporate relevant information about past events, current conditions, and reasonable and supportable forecasts. With the exception of the Company's residential loan segment, the Company's PD models share a common definition of default, which include loans that are 90 days past due, on nonaccrual status, have a charge-off, or obligor bankruptcy. Input reversion is used for all loan segment models, except for the commercial and industrial and CRE, owner-occupied loan segments. Output reversion is used for the commercial and industrial and CRE, owner-occupied loan segments by incorporating, after the forecast period, a one-year linear reversion to the long-term reversion rate in year three through the remaining life of the loans within the respective segments. LGDs are typically derived from the Company's historical loss experience. However, for the residential, warehouse lending, and municipal and nonprofit loan segments, where the Company has either zero (or near zero) losses, or has a limited loss history through the last economic downturn, certain non-modeled methodologies are employed to estimate LGD. Factors utilized in calculating average LGD vary for each loan segment and are further described below. Exposure at default refers to the Company's exposure to loss at the time of borrower default. For revolving lines of credit, the Company incorporates an expectation of increased line utilization for a higher EAD on defaulted loans based on historical experience. For term loans, EAD is calculated using an amortization schedule based on contractual loan terms, adjusted for a prepayment rate assumption. Prepayment trends are sensitive to interest rates and the macroeconomic environment. Fixed rate loans are more influenced by interest rates, whereas variable rate loans are more influenced by the macroeconomic environment. After the quantitative expected loss estimates are calculated, management then adjusts these estimates to incorporate considerations of current trends and conditions that are not captured in the quantitative loss estimates, through the use of qualitative and/or environmental factors.

The following provides credit quality indicators and risk elements most relevant in monitoring and measuring the allowance for credit losses on loans for each of the loan portfolio segments identified:

Warehouse lending

The warehouse lending portfolio segment consists of mortgage warehouse lines, MSR financing facilities, and note finance loans, which have a monitored borrowing base to mortgage companies and similar lenders and are primarily structured as commercial and industrial loans. The collateral for these loans is primarily comprised of residential whole loans and MSRs, with the borrowing base of these loans tightly monitored and controlled by the Company. The primary support for these loans takes the form of pledged collateral, with secondary support provided by the capacity of the financial institution. The collateral-driven nature of these loans distinguish them from traditional commercial and industrial loans. These loans are impacted by interest rate shocks, residential lending rates, prepayment assumptions, and general real estate stress. As a result of the unique loan characteristics, limited historical default and loss experience, and the collateral nature of this loan portfolio segment, the Company uses a non-modeled approach to estimate expected credit losses, leveraging grade information, grade migration history, and management judgment.

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Municipal and nonprofit

The municipal and nonprofit portfolio segment consists of loans to local governments, government-operated utilities, special assessment districts, hospitals, schools and other nonprofits. These loans are generally, but not exclusively, entered into for the purpose of financing real estate investment or for refinancing existing debt and are primarily structured as commercial and industrial loans. Loans are supported by taxes or utility fees, and in some cases tax liens on real estate, operating revenue of the institution, or other collateral support the loans. While unemployment rates and the market valuation of residential properties have an effect on the tax revenues supporting these loans, these loans tend to be less cyclical in comparison to similar commercial loans due to reliance on diversified tax bases. The Company uses a non-modeled approach to estimate expected credit losses for this portfolio segment, leveraging grade information and historical municipal default rates.

Tech & innovation

The tech & innovation portfolio segment is comprised of commercial loans that are originated within this business line and are not collateralized by real estate. The source of repayment of these loans is generally expected to be the income that is generated from the business. Expected credit losses for this loan segment are estimated using both a vendor model and an internally-developed model. These models incorporate market level and company-specific factors such as financial statement variables, adjusted for the current stage of the credit cycle and for the Company's loan performance data such as delinquency, utilization, maturity, and size of the loan commitment under specific macroeconomic scenarios to produce a probability of default. Macroeconomic variables include the Dow Jones Index, credit spread between the BBB Bond Yield and 10-Year Treasury Bond Yield, unemployment rate, and CBOE VIX Index quarterly high. LGD and the prepayment rate assumption for EAD for this loan segment are driven by unemployment levels.

Equity fund resources

The equity fund resources portfolio segment is comprised of commercial loans to private equity and venture capital funds. The primary source of repayment of these loans is typically uncalled capital commitments from institutional investors and high net worth individuals. The Company uses a non-modeled approach to estimate expected credit losses for this portfolio segment, leveraging loan grade information.

Other commercial and industrial

The other commercial and industrial segment is comprised of commercial and industrial loans that are not originated within the Company's specialty business lines and are not collateralized by real estate. The models used to estimate expected credit losses for this loan segment are the same as those used for the tech & innovation portfolio segment.

Commercial real estate, owner-occupied

The CRE, owner-occupied portfolio segment is comprised of commercial loans that are collateralized by real estate, where the borrower has a business that occupies the property. These loans are typically entered into for the purpose of providing real estate finance or improvement. The primary source of repayment of these loans is the income generated by the business and where rental or sale of the property may provide secondary support for the loan. These loans are sensitive to general economic conditions as well as the market valuation of CRE properties. The probability of default estimate for this loan segment is modeled using the same model as the commercial and industrial loan segment. LGD for this loan segment is driven by property appreciation and the prepayment rate assumption for EAD is driven by unemployment levels.

Hotel franchise finance

The hotel franchise finance segment is comprised of loans that are originated within this business line and are collateralized by real estate, where the owner is not the primary tenant. These loans are typically entered into for the purpose of financing or the improvement of commercial investment properties. The primary source of repayment of these loans are the rents paid by tenants and where the sale of the property may provide secondary support for the loan. These loans are sensitive to the market valuation of CRE properties, rental rates, and general economic conditions. The vendor model used to estimate expected credit losses for this loan segment projects probabilities of default and exposure at default based on multiple macroeconomic scenarios by modeling how macroeconomic conditions affect the commercial real estate market. Real estate market factors utilized in this model include vacancy rate, rental growth rate, net operating income growth rate, and commercial property price changes for each specific property type. The model then incorporates loan and property-level characteristics including debt coverage, leverage, collateral size, seasoning, and property type. LGD for this loan segment is derived from a non-modeled approach that is driven by property appreciation and the prepayment rate assumption for EAD is driven by the property appreciation for fixed rate loans and unemployment levels for variable rate loans.

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Other commercial real estate, non-owner occupied

The other commercial real estate, non-owner occupied segment is comprised of loans that are collateralized by real estate, where the owner is not the primary tenant but are not originated within the Company's specialty business lines. The model used to estimate expected credit losses for this loan segment is the same as the model used for the hotel franchise finance portfolio segment.

Residential

The residential loan portfolio segment is comprised of loans collateralized primarily by first liens on 1-4 residential family properties and home equity lines of credit that are collateralized by either first liens or junior liens on residential properties. The primary source of repayment of these loans is the value of the property and the capacity of the owner to make payments on the loan. Unemployment rates and the market valuation of residential properties will impact the ultimate repayment of these loans. The residential mortgage loan model is a vendor model that projects probability of default, loss given default severity, prepayment rate, and exposure at default to calculate expected losses. The model is intended to capture the borrower's payment behavior during the lifetime of the residential loan by incorporating loan level characteristics such as loan type, coupon, age, loan-to-value, and credit score and economic conditions such as Home Price Index, interest rate, and unemployment rate. A default event for residential loans is defined as 60 days or more past due, with property appreciation as the driver for LGD results. The prepayment rate assumption for exposure at default for residential loans is based on industry prepayment history.

Probability of default for HELOCs is derived from an internally-developed model that projects PD by incorporating loan level information such as delinquency status, loan term, and FICO score and macroeconomic conditions such as property appreciation. LGD for this loan segment is driven by property appreciation and lien position. Exposure at default for HELOCs is calculated based on utilization rate assumptions using a non-modeled approach and also incorporates management judgment.

Construction and land development

The construction and land portfolio segment is comprised of loans collateralized by land or real estate, which are entered into for the purpose of real estate development. The primary source of repayment of these loans is the eventual sale or refinance of the completed project and where claims on the property provide secondary support for the loan. These loans are impacted by the market valuation of CRE and residential properties and general economic conditions that have a higher sensitivity to real estate markets compared to other real estate loans. Default risk of a property is driven by loan-specific drivers, including loan-to-value, maturity, origination date, and the MSA in which the property is located, among other items. The variables used in the internally-developed model include loan level drivers such as origination loan-to-value, loan maturity, and macroeconomic drivers such as property appreciation, MSA level unemployment rate, and national GDP growth. LGD for this loan segment is driven by property appreciation. The prepayment rate assumption for EAD is driven by the property appreciation for fixed rate loans and unemployment levels for variable rate loans.

Other

The other portfolio consists of loans not already captured in one of the aforementioned loan portfolio segments, which include, but may not be limited to, overdraft lines for treasury services, credit cards, consumer loans not collateralized by real estate, and small business loans collateralized by residential real estate. The consumer and small business loans are supported by the capacity of the borrower and the valuation of any collateral. General economic factors such as unemployment will have an effect on these loans. The Company uses a non-modeled approach to estimate expected credit losses, leveraging average historical default rates. LGD for this loan segment is driven by unemployment levels and lien position. The prepayment rate assumption for EAD is driven by the BBB corporate spread for fixed rate loans and unemployment levels for variable rate loans.

Off-balance sheet credit exposures, including unfunded loan commitments

The Company maintains a separate allowance for credit losses on off-balance-sheet credit exposures, including unfunded loan commitments, financial guarantees, and letters of credit, which is classified in Other liabilities on the Consolidated Balance Sheet. The allowance for credit losses on off-balance sheet credit exposures is adjusted through increases or decreases to the provision for credit loss expense. The estimate includes consideration of the likelihood that funding will occur, an estimate of exposure at default that is derived from utilization rate assumptions using a non-modeled approach, and PD and LGD estimates that are derived from the same models and approaches for the Company's other loan portfolio segments described in the Allowance for credit losses on HFI loans section within this note as these unfunded commitments share similar risk characteristics with these loan portfolio segments. The Company does not record a credit loss estimate for off-balance sheet credit exposures that are unconditionally cancellable by the Company or for undrawn amounts under such arrangements that may be drawn prior to the cancellation of the arrangement.

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Mortgage servicing rights

The Company acquired MSRs as part of the AmeriHome acquisition and continues to generate new MSRs from its mortgage banking business. When the Company sells mortgage loans in the secondary market and retains the right to service these loans, a servicing right asset is capitalized at the time of sale when the benefits of servicing are deemed to be greater than adequate compensation for performing the servicing activities. MSRs represent the then-current fair value of future net cash flows expected to be realized from performing servicing activities. The Company has elected to subsequently measure MSRs at fair value and report changes in fair value in current period income as a component of Net loan servicing revenue in the Consolidated Income Statement.

The Company may in the ordinary course of business sell MSRs and will recognize, as of the trade date, a gain or loss on the sale equal to the difference between the carrying value of the transferred MSRs and the value of the assets received as consideration. The Company subsequently derecognizes MSRs when substantially all of the risks and rewards of ownership are irrevocably passed to the transferee and any protection provisions retained by the Company are minor and can be reasonably estimated, which typically occurs on the settlement date. Protection provisions are considered to be minor if the obligation created by such provisions is estimated to be no more than 10 percent of the sales price and the Company retains the risk of prepayment for no more than 120 days. The Company records an estimated liability for retained protection provisions as of the trade date and continues to remeasure this liability until settlement, with any changes in the estimated liability recorded in earnings. In addition, fees to transfer loans associated with the sold MSRs to a new servicer are also recorded on the settlement date. Gains or losses on sales of MSRs, net of retained protection provisions, and transfer fees are included in Net loan servicing revenue in the Consolidated Income Statement.

Leases (lessee)

At inception, contracts are evaluated to determine whether the contract constitutes a lease agreement. For contracts that are determined to be an operating lease, a corresponding ROU asset and operating lease liability are recorded in separate line items on the Consolidated Balance Sheet. A ROU asset represents the Company’s right to use an underlying asset during the lease term and a lease liability represents the Company’s commitment to make contractually obligated lease payments. Operating lease ROU assets and liabilities are recognized at the commencement date of the lease and are based on the present value of lease payments over the lease term. The measurement of the operating lease ROU asset includes any lease payments made and is reduced by lease incentives that are paid or are payable to the Company. Variable lease payments that depend on an index or rate such as the Consumer Price Index are included in lease payments based on the rate in effect at the commencement date of the lease. Lease payments are recognized on a straight-line basis over the lease term as part of Occupancy expense in the Consolidated Income Statements.

As the rate implicit in the lease is not readily determinable, the Company's incremental collateralized borrowing rate is used to determine the present value of lease payments. This rate gives consideration to the applicable FHLB collateralized borrowing rates and is based on the information available at the commencement date. The Company has elected to apply the short-term lease measurement and recognition exemption to leases with an initial term of 12 months or less; therefore, these leases are not recorded on the Company’s Consolidated Balance Sheet, but rather, lease expense is recognized over the lease term on a straight-line basis. The Company’s lease agreements may include options to extend or terminate the lease. These options are included in the lease term when it is reasonably certain that the options will be exercised.

The Company also made an accounting policy election to not separate non-lease components from the associated lease component, and instead account for them together as part of the applicable lease component. The majority of the Company’s non-lease components such as common area maintenance, parking, and taxes are variable, and are expensed as incurred. Variable payment amounts are determined in arrears by the landlord depending on actual costs incurred.

Goodwill and other intangible assets

The Company records as goodwill the excess of the purchase price in a business combination over the fair value of the identifiable net assets acquired in accordance with applicable guidance. The Company performs its annual goodwill and intangibles impairment tests as of October 1 each year, or more often if events or circumstances indicate that the carrying value may not be recoverable. The Company can first elect to assess, through qualitative factors, whether it is more likely than not that goodwill is impaired. If the qualitative assessment indicates potential impairment, a quantitative impairment test is performed. If, based on the quantitative test, a reporting unit's carrying amount exceeds its fair value, a goodwill impairment charge for this difference is recorded to current period earnings as part of non-interest expense.

The Company’s intangible assets consist of correspondent relationships, operating licenses, tradenames, core deposit intangibles, customer relationships, and developed technology assets that are being amortized over periods of five to 40 years, with the exception of the Bridge Bank tradename which has an indefinite life. See "Note 2. Mergers, Acquisitions and

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Dispositions" of these Notes to Unaudited Consolidated Financial Statements for discussion of the intangible assets acquired as part of the AmeriHome and Digital Disbursements acquisitions.

The Company considers the remaining useful lives of its intangible assets each reporting period, as required by ASC 350, Intangibles—Goodwill and Other, to determine whether events and circumstances warrant a revision to the remaining period of amortization. If the estimate of an intangible asset’s remaining useful life has changed, the remaining carrying amount of the intangible asset is amortized prospectively over the revised remaining useful life. The Company has not revised its estimates of the useful lives of its intangible assets during the three months ended March 31, 2022 or 2021.

Stock compensation plans

The Company has an incentive plan that gives the BOD the authority to grant stock awards, consisting of unrestricted stock, stock units, dividend equivalent rights, stock options (incentive and non-qualified), stock appreciation rights, restricted stock, and performance and annual incentive awards. Compensation expense on non-vested restricted stock awards is based on the fair value of the award on the measurement date which, for the Company, is the date of the grant and is recognized ratably over the service period of the award. Forfeitures are estimated at the time of the award grant and revised in subsequent periods if actual forfeitures differ from those estimates. The fair value of non-vested restricted stock awards is the market price of the Company’s stock on the date of grant.

The Company's performance stock units have a cumulative EPS target and a TSR performance measure component. The TSR component is a market-based performance condition that is separately valued as of the date of the grant. A Monte Carlo valuation model is used to determine the fair value of the TSR performance metric, which simulates potential TSR outcomes over the performance period and determines the payouts that would occur in each scenario. The resulting fair value of the TSR component is based on the average of these results. Compensation expense related to the TSR component is based on the fair value determination on the date of the grant and is not subsequently revised based on actual performance. Compensation expense related to the EPS component for these awards is based on the fair value (market price of the Company's stock on the date of the grant) of the award. Compensation expense related to both the TSR and EPS components is recognized ratably over the service period of the award.

See "Note 9. Stockholders' Equity" of these Notes to Unaudited Consolidated Financial Statements for further discussion of stock awards.

Dividends

WAL is a legal entity separate and distinct from its subsidiaries. As a holding company with limited significant assets other than the capital stock of its subsidiaries, WAL's ability to pay dividends depends primarily upon the receipt of dividends or other capital distributions from its subsidiaries. The Company's subsidiaries' ability to pay dividends to WAL is subject to, among other things, their individual earnings, financial condition, and need for funds, as well as federal and state governmental policies and regulations applicable to WAL and each of those subsidiaries, which limit the amount that may be paid as dividends without prior approval. In addition, the terms and conditions of other securities the Company issues may restrict its ability to pay dividends to holders of the Company's common stock. For example, if any required payments on outstanding trust preferred securities are not made, WAL would be prohibited from paying cash dividends on its common stock.

Preferred stock

On September 22, 2021, the Company issued an aggregate of 12,000,000 depositary shares, 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). The Company's Series A preferred stock is perpetual preferred stock that is not subject to any mandatory redemption, resulting in classification as permanent equity. Dividends on preferred stock are recognized on the declaration date and are recorded as a reduction of retained earnings.

Treasury shares

The Company separately presents treasury shares, which 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. Treasury shares are carried at cost.

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Sales of common stock under ATM program

The Company has a distribution agency agreement with J.P. Morgan Securities LLC and Piper Sandler & Co., under which the Company may sell up to 6,132,670 shares of its common stock on the NYSE. The Company pays the distribution agents a mutually agreed rate, not to exceed 2% of the gross offering proceeds of the shares sold pursuant to the distribution agency agreement. The common stock is sold at prevailing market prices at the time of the sale or at negotiated prices and, as a result, prices will vary. Any 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). See "Note 9. Stockholders' Equity" of these Notes to Unaudited Consolidated Financial Statements for further discussion of this program.

Derivative financial instruments

The Company uses interest rate swaps to mitigate interest-rate risk associated with changes to the fair value of certain fixed-rate financial instruments (fair value hedges).

The Company recognizes derivatives as assets or liabilities on the Consolidated Balance Sheet at their fair value in accordance with ASC 815, Derivatives and Hedging. The accounting for changes in the fair value of a derivative instrument depends on whether it has been designated and qualifies as part of a hedging relationship and further, on the type of hedging relationship. Derivative instruments designated in a hedge relationship to mitigate exposure to changes in the fair value of an asset or liability attributable to a particular risk, such as interest rate risk, are considered fair value hedges.

The Company documents its hedge relationships, including identification of the hedging instruments and the hedged items, as well as its risk management objectives and strategies for undertaking the hedge transaction after the derivative contract is executed. At inception, the Company performs a quantitative assessment to determine whether the derivatives used in hedging transactions are highly effective (as defined in the guidance) in offsetting changes in the fair value of the hedged item. Retroactive effectiveness is assessed, as well as the continued expectation that the hedge will remain effective prospectively. After the initial quantitative assessment is performed, on a quarterly basis, the Company performs a qualitative hedge effectiveness assessment. This assessment takes into consideration any adverse developments related to the counterparty's risk of default and any negative events or circumstances that affect the factors that originally enabled the Company to assess that it could reasonably support, qualitatively, an expectation that the hedging relationship was and will continue to be highly effective. The Company discontinues hedge accounting prospectively when it is determined that a hedge is no longer highly effective. When hedge accounting is discontinued on a fair value hedge that no longer qualifies as an effective hedge, the derivative instrument continues to be reported at fair value on the Consolidated Balance Sheet, but the carrying amount of the hedged item is no longer adjusted for future changes in fair value. The adjustment to the carrying amount of the hedged item that existed at the date hedge accounting is discontinued is amortized over the remaining life of the hedged item into earnings.

Changes in the fair value of a derivative that is designated and qualifies as a fair value hedge, along with changes in the fair value of the hedged asset or liability that are attributable to the hedged risk, are recorded in the same line item as the offsetting loss or gain on the related interest rate swaps during the period of change. For loans, the gain or loss on the hedged item is included in interest income and for subordinated debt, the gain or loss on the hedged items is included in interest expense.

Derivative instruments that are not designated as hedges, so called free-standing derivatives, are reported on the Consolidated Balance Sheet at fair value and the changes in fair value are recognized in earnings as non-interest income during the period of change. With the acquisition of AmeriHome, the Company's economic hedging volume has substantially increased. The Company enters into commitments to purchase mortgage loans that will be held for sale. These loan commitments, described as IRLCs, qualify as derivative instruments, except those that are originated rather than purchased, and intended for HFI classification. As of March 31, 2022, all IRLCs qualify as derivative instruments. Changes in fair value associated with changes in interest rates are economically hedged by utilizing forward sale commitments and interest rate futures. These hedging instruments are typically entered into contemporaneously with IRLCs. Loans that have been or will be purchased or originated may be used to satisfy the Company's forward sale commitments. In addition, derivative financial instruments are also used to economically hedge the Company's MSR portfolio. Changes in the fair value of derivative financial instruments that hedge IRLCs and loans HFS are included in Net gain on loan origination and sale activities in the Consolidated Income Statement. Changes in the fair value of derivative financial instruments that hedge MSRs are included in Net loan servicing revenue in the Consolidated Income Statement.

The Company may in the normal course of business purchase a financial instrument or originate a loan that contains an embedded derivative instrument. Upon purchasing the instrument or originating the loan, the Company assesses whether the economic characteristics of the embedded derivative are clearly and closely related to the economic characteristics of the remaining component of the financial instrument (i.e., the host contract) and whether a separate instrument with the same terms as the embedded instrument would meet the definition of a derivative instrument. When it is determined that the embedded

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derivative possesses economic characteristics that are not clearly and closely related to the economic characteristics of the host contract and a separate instrument with the same terms would qualify as a derivative instrument, the embedded derivative is separated from the host contract and carried at fair value. However, in cases where the host contract is measured at fair value, with changes in fair value reported in current earnings, or the Company is unable to reliably identify and measure an embedded derivative for separation from its host contract, the entire contract is carried on the Consolidated Balance Sheet at fair value and is not designated as a hedging instrument.

Off-balance sheet instruments

In the ordinary course of business, the Company enters into off-balance sheet financial instrument arrangements consisting of commitments to extend credit and standby letters of credit. Such financial instruments are recorded in the Consolidated Balance Sheets when funded. These off-balance sheet financial instruments impact, to varying degrees, elements of credit risk in excess of amounts recognized on the Consolidated Balance Sheet. Losses could be experienced when the Company is contractually obligated to make a payment under these instruments and must seek repayment from the borrower, which may not be as financially sound in the current period as they were when the commitment was originally made. Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract and, in certain instances, may be unconditionally cancelable. 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 also has off-balance sheet arrangements related to its derivative instruments. Derivative instruments are recognized in the Consolidated Balance Sheets at fair value and their notional values are carried off-balance sheet. See "Note 11. Derivatives and Hedging Activities" of these Notes to Unaudited Consolidated Financial Statements for further discussion.

Fair values of financial instruments

The Company uses fair value measurements to record fair value adjustments to certain assets and liabilities. ASC 820, Fair Value Measurement, establishes a framework for measuring fair value and a three-level valuation hierarchy for disclosure of fair value measurement, and also sets forth disclosure requirements for fair value measurements. The valuation hierarchy is based upon the transparency of inputs to the valuation of an asset or liability as of the measurement date. The Company uses various valuation approaches, including market, income, and/or cost approaches. ASC 820 establishes a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that observable inputs be used when available. Observable inputs are inputs that market participants would use in pricing the asset or liability and are developed based on market data obtained from sources independent of the Company. Unobservable inputs are inputs that reflect the Company’s assumptions about the factors market participants would consider in pricing the asset or liability and are developed based on the best information available in the circumstances. The hierarchy is broken down into three levels based on the reliability of inputs, as follows:

•Level 1 - Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities.

•Level 2 - Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. These might include quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (such as interest rates, prepayment speeds, volatilities, etc.) or model-based valuation techniques where all significant assumptions are observable, either directly or indirectly, in the market.

•Level 3 - Valuation is generated from model-based techniques where one or more significant inputs are not observable, either directly or indirectly, in the market. These unobservable assumptions reflect the Company’s own estimates of assumptions that market participants would use in pricing the asset or liability. Valuation techniques may include use of matrix pricing, discounted cash flow models, and similar techniques.

The availability of observable inputs varies based on the nature of the specific financial instrument. To the extent that valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires more judgment. Accordingly, the degree of judgment exercised by the Company in determining fair value is greatest for instruments categorized in Level 3. In certain cases, the inputs used to measure fair value may fall into different levels of the

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fair value hierarchy. For disclosure purposes, the lowest level input that is significant to the fair value measurement determines the level in the fair value hierarchy within which the fair value measurement falls in its entirety.

Fair value is a market-based measure considered from the perspective of a market participant who may purchase the asset or assume the liability, rather than an entity-specific measure. When market assumptions are available, ASC 820 requires that the Company consider the assumptions that market participants would use to estimate the fair value of the financial instrument at the measurement date.

ASC 825, Financial Instruments, requires disclosure of fair value information about financial instruments, whether or not recognized in the balance sheet, for which it is practicable to estimate that value.

Management uses its best judgment in estimating the fair value of the Company’s financial instruments; however, there are inherent limitations in any estimation technique. Therefore, for substantially all financial instruments, the fair value estimates presented herein are not necessarily indicative of the amounts the Company could have realized in a sales transaction at March 31, 2022 and December 31, 2021. The estimated fair value amounts for March 31, 2022 and December 31, 2021 have been measured as of period-end, and have not been re-evaluated or updated for purposes of these Unaudited Consolidated Financial Statements subsequent to those dates. As such, the estimated fair values of these financial instruments subsequent to the reporting date may be different than the amounts reported at period-end.

The information in "Note 15. Fair Value Accounting" of these Notes to Unaudited Consolidated Financial Statements should not be interpreted as an estimate of the fair value of the entire Company since a fair value calculation is only required for a limited portion of the Company’s assets and liabilities.

Due to the wide range of valuation techniques and the degree of subjectivity used in making the estimate, comparisons between the Company’s disclosures and those of other companies or banks may not be meaningful.

The following methods and assumptions were used by the Company in estimating the fair value of its financial instruments:

Cash, cash equivalents, and restricted cash

The carrying amounts reported on the Consolidated Balance Sheet for cash and due from banks approximate their fair value.

Investment securities

The fair values of U.S. treasury and certain other debt securities as well as publicly-traded CRA investments and exchange-listed preferred stock are based on quoted market prices and are categorized as Level 1 in the fair value hierarchy.

The fair values of debt securities are primarily determined based on matrix pricing. Matrix pricing is a mathematical technique that utilizes observable market inputs including, yield curves, credit ratings, and prepayment speeds. Fair values determined using matrix pricing are generally categorized as Level 2 in the fair value hierarchy. In addition to matrix pricing, the Company uses other pricing sources, including observed prices on publicly traded securities and dealer quotes, to estimate the fair value of debt securities, which are also categorized as Level 2 in the fair value hierarchy.

Restricted stock

Restricted stock consists of investments in the capital stock of the FRB and the FHLB. As no ready market exists for them, and they have no quoted market value, the fair values of these investments have been categorized as Level 2 in the fair value hierarchy.

Loans HFS

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

The fair value of non-agency loans HFS as well as certain loans that become nonsalable into active markets due to the identification of a defect is determined based on valuation techniques that utilize Level 3 inputs.

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Loans HFI

The fair value of loans is estimated based on discounted cash flows using interest rates currently being offered for loans with similar terms to borrowers with similar credit quality and adjustments that the Company believes a market participant would consider in determining fair value based on a third-party independent valuation. As a result, the fair value for loans is categorized as Level 3 in the fair value hierarchy.

Mortgage servicing rights

The fair value of MSRs is estimated using a discounted cash flow model that incorporates assumptions that a market participant would use in estimating the fair value of servicing rights, including, but not limited to, option adjusted spread, conditional prepayment rate, servicing fee rate, and cost to service. As a result, the fair value for MSRs is categorized as Level 3 in the fair value hierarchy.

Accrued interest receivable and payable

The carrying amounts reported on the Consolidated Balance Sheet for accrued interest receivable and payable approximate their fair values.

Derivative financial instruments

All derivatives are recognized on the Consolidated Balance Sheets at fair value. The valuation methodologies used to estimate the fair value of derivative instruments varies by type. Treasury futures and options, Eurodollar futures, and swap futures are measured based on valuation techniques using Level 1 Inputs from exchange-provided daily settlement quotes. Interest rate swaps and forward purchase and sales contracts are measured based on valuation techniques using Level 2 inputs, such as quoted market price, contracted selling price, or market price equivalent. 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 the pull-through rate. The pull-through rate and servicing fee multiple are unobservable inputs based on historical experience.

Deposits

The fair value disclosed for demand and savings deposits is by definition equal to the amount payable on demand at the reporting date (that is, their carrying amount), as these deposits do not have a contractual term. The carrying amount for variable rate deposit accounts approximates their fair value. Fair values for fixed rate certificates of deposit are estimated using a discounted cash flow calculation that applies interest rates currently being offered on certificates to a schedule of aggregated expected monthly maturities on these deposits. The fair value measurement of deposit liabilities is categorized as Level 2 in the fair value hierarchy.

FHLB advances and customer repurchase agreements

The fair values of the Company’s borrowings are estimated using discounted cash flow analyses, based on the market rates for similar types of borrowing arrangements. The carrying value of FHLB advances and customer repurchase agreements approximate their fair values due to their short durations and have been categorized as Level 2 in the fair value hierarchy.

Credit linked notes

The fair value of credit linked notes is based on observable inputs, when available, and as such credit linked notes are categorized as Level 2 liabilities. Because the notes are variable rate debt, the fair value approximates carrying value.

Subordinated debt

The fair value of subordinated debt is based on the market rate for the respective subordinated debt security. Subordinated debt has been categorized as Level 2 in the fair value hierarchy.

Junior subordinated debt

Junior subordinated debt is valued based on a discounted cash flow model which uses the Treasury Bond rates and the 'BB' and 'BBB' rated financial indexes as inputs. Junior subordinated debt has been categorized as Level 3 in the fair value hierarchy.

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Income taxes

The Company is subject to income taxes in the United States and files a consolidated federal income tax return with all of its subsidiaries, with the exception of BW Real Estate, Inc. Deferred income taxes are recorded to reflect the effects of temporary differences between the financial reporting carrying amounts of assets and liabilities and their income tax bases using enacted tax rates that are expected to be in effect when the taxes are actually paid or recovered. As changes in tax laws or rates are enacted, deferred tax assets and liabilities are adjusted through the provision for income taxes.

Net deferred tax assets are recorded to the extent that these assets will more-likely-than-not be realized. In making these determinations, all available positive and negative evidence is considered, including scheduled reversals of deferred tax liabilities, tax planning strategies, projected future taxable income, and recent operating results. If it is determined that deferred income tax assets to be realized in the future are in excess of their net recorded amount, an adjustment to the valuation allowance will be recorded, which will reduce the Company's provision for income taxes.

A tax benefit from an unrecognized tax benefit may be recognized when it is more-likely-than-not that the position will be sustained upon examination, including related appeals or litigation, based on technical merits. Income tax benefits must meet a more-likely-than-not recognition threshold at the effective date to be recognized.

Interest and penalties related to unrecognized tax benefits are recognized as part of the provision for income taxes in the Consolidated Income Statement. Accrued interest and penalties are included in the related tax liability line with other liabilities on the Consolidated Balance Sheet. See "Note 13. Income Taxes" of these Notes to Unaudited Consolidated Financial Statements for further discussion on income taxes.

Non-interest income

Non-interest income includes revenue associated with mortgage banking and commercial banking activities, investment securities, equity investments, and bank owned life insurance. These non-interest income streams are primarily generated by different types of financial instruments, held by the Company for which there is specific accounting guidance and therefore, are not within the scope of ASC 606, Revenue from Contracts with Customers.

Non-interest income amounts within the scope of ASC 606 include service charges and fees, success fees related to equity investments, debit and credit card interchange fees, and legal settlement services fees. Service charges and fees consist of fees earned from performance of account analysis, general account services, and other deposit account services. These fees are recognized as the related services are provided. Success fees are one-time fees detailed as part of certain loan agreements and are earned immediately upon occurrence of a triggering event. Card income includes fees earned from customer use of debit and credit cards, interchange income from merchants, and international charges. Card income is generally within the scope of ASC 310, Receivables; however, certain processing transactions for merchants, such as interchange fees, are within the scope of ASC 606. The Company generally receives payment for its services during the period or at the time services are provided and, therefore, does not have material contract asset or liability balances at period end. Legal settlement service fees relate to payment services provided for the distribution of funds from legal settlements and are recognized upon transfer of funds to a claimant. See "Note 17. Revenue from Contracts with Customers" of these Notes to Unaudited Consolidated Financial Statements for further details related to the nature and timing of revenue recognition for non-interest income revenue streams within the scope of this standard.

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2. MERGERS, ACQUISITIONS AND DISPOSITIONS

Acquisition of Digital Disbursements

On January 25, 2022, the Company completed its acquisition of Digital Settlement Technologies LLC, doing business as Digital Disbursements, a digital payments platform for the class action legal industry. The acquisition of DST is expected to extend the Company's digital payment efforts by providing a digital payments platform for the class action market and broader legal industry.

This transaction was accounted for as a business combination under the acquisition method of accounting. Assets purchased and liabilities assumed were recorded at their respective acquisition date estimated fair values. During the measurement period (not to exceed one year from the acquisition date), the fair values of assets acquired and liabilities assumed are subject to adjustment if additional information becomes available to indicate a more accurate or appropriate value for an asset or liability. As the Company is still in the process of reviewing the fair value methodology and assumptions used in the valuation of identifiable intangible assets, the fair values of these intangible assets are considered provisional. The Company is also assessing the value of any associated DTAs, which are also provisional.

Total consideration of $67.8 million, comprised of cash paid at closing of $50.6 million and contingent consideration with an estimated fair value of $17.2 million, was exchanged for all of the issued and outstanding membership interests of DST. The terms of the acquisition include a contingent consideration arrangement that is based on performance for the three year period subsequent to the acquisition. There is no required minimum payment amount or maximum payment amount specified under the terms of the contingent consideration agreement. The fair value of the contingent consideration recognized on the acquisition date was estimated using a discounted cash flow approach, and is considered provisional, as the Company is still in the process of reviewing the fair value methodology and assumptions associated with the contingent consideration.

DST’s results of operations have been included in the Company's results beginning January 25, 2022 and are reported as part of the Consumer Related segment. Acquisition and restructure expenses related to the DST acquisition of $0.4 million for the three months ended March 31, 2022 were included as a component of non-interest expense in the Consolidated Income Statement, all of which are acquisition related costs as defined by ASC 805.

The fair value amounts of identifiable assets acquired and liabilities assumed as part of the DST acquisition are as follows:

	January 25, 2022
	(in millions)
Assets acquired:
Cash and cash equivalents	$	0.6
Identified intangible assets	27.5
Other assets	0.1
Total assets	$	28.2
Liabilities assumed:
Other liabilities	$	0.4
Total liabilities	0.4
Net assets acquired	$	27.8
Consideration paid
Cash	$	50.6
Contingent consideration	17.2
Total consideration	$	67.8
Goodwill	$	40.0

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In connection with the acquisition, the Company acquired identifiable intangible assets totaling $27.5 million, as detailed in the table below:

	Acquisition Date Fair Value		Estimated Useful Life
	(in millions)		(in years)
Customer relationships	$	20.9	7
Developed technology	6.2		5
Trade name	0.4		10
Total	$	27.5

Goodwill in the amount of $40.0 million was recognized and is expected to be fully deductible for tax purposes. Goodwill was allocated entirely to the Consumer Related segment and represents the strategic, operational, and financial benefits expected from the acquisition, including expansion of the Company's settlement services offerings, diversification of its revenue sources, and post-acquisition synergies from integrating Digital Disbursements, as well as the value of the acquired workforce.

Acquisition of AmeriHome

On April 7, 2021, the Company completed its acquisition of Aris, the parent company of AmeriHome, and certain other parties, pursuant to which Aris merged with and into an indirect subsidiary of WAB. As a result of the merger, AmeriHome is a wholly-owned indirect subsidiary of the Company and continues to operate as AmeriHome Mortgage, a Western Alliance Bank company. AmeriHome is a leading national business-to-business mortgage acquirer and servicer. The acquisition of AmeriHome complements the Company’s national commercial businesses with a mortgage franchise that allows the Company to expand mortgage-related offerings to existing clients and diversifies the Company’s revenue profile by expanding sources of non-interest income.

Total cash consideration of $1.2 billion was paid in exchange for all of the issued and outstanding membership interests of Aris. AmeriHome's results of operations have been included in the Company's results beginning April 7, 2021 and are reported as part of the Consumer Related segment. There were no acquisition and restructure expenses related to the AmeriHome acquisition that were recognized during the three months ended March 31, 2022. For the three months ended March 31, 2021, the Company recognized $0.4 million in acquisition/restructure expenses related to the AmeriHome acquisition.

This transaction was accounted for as a business combination under the acquisition method of accounting. Assets purchased and liabilities assumed were recorded at their respective acquisition date estimated fair values. During the three months ended March 31, 2022, the Company adjusted its initial provisional estimates based on new information regarding facts and circumstances that existed as of the acquisition date, resulting in a decrease of $1.6 million in other liabilities. This measurement period adjustment did not have a significant impact on the Company's Consolidated Income Statement. As of March 31, 2022, the fair value of all acquired assets and assumed liabilities are considered final.

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The fair value amounts of identifiable assets acquired and liabilities assumed as part of the AmeriHome acquisition are as follows:

	April 7, 2021
	(in millions)
Assets acquired:
Cash and cash equivalents	$	207.2
Loans held for sale	3,552.9
Mortgage servicing rights	1,347.0
Premises and equipment, net	11.3
Operating right of use asset	18.9
Identified intangible assets	141.0
Loans eligible for repurchase	2,744.7
Deferred tax asset	6.6
Other assets	236.0
Total assets	$	8,265.6
Liabilities assumed:
Other borrowings	$	3,633.9
Operating lease liability	18.9
Liability for loans eligible for repurchase	2,744.7
Other liabilities	149.5
Total liabilities	6,547.0
Net assets acquired	$	1,718.6
Consideration paid
Cash	$	1,231.6
Elimination of pre-existing debt	686.8
Total consideration	$	1,918.4
Goodwill	$	199.8

In connection with the acquisition, the Company acquired identifiable intangible assets totaling $141.0 million, as detailed in the table below:

	Acquisition Date Fair Value		Estimated Useful Life
	(in millions)		(in years)
Correspondent customer relationships	$	76.0	20
Operating licenses	55.5		40
Trade name	9.5		20
Total	$	141.0

Goodwill in the amount of $199.8 million was recognized and allocated entirely to the Consumer Related segment. Goodwill represents the strategic, operational, and financial benefits expected from the acquisition, including expansion of the Company's mortgage offerings, diversification of its revenue sources, and post-acquisition synergies from integrating AmeriHome’s operating platform, as well as the value of the acquired workforce. Approximately $185.0 million of goodwill is expected to be deductible for tax purposes.

The following table presents pro forma information as if the AmeriHome acquisition was completed on January 1, 2020. The pro forma information includes adjustments for interest income and interest expense on existing loan agreements between WAL and AmeriHome prior to acquisition, the impact of MSR sales contemplated in connection with the acquisition, amortization of intangible assets arising from the acquisition, recognition of stock compensation expense for awards issued to certain AmeriHome executives, transaction costs, and related income tax effects. The pro forma information is not necessarily indicative of the results of operations as they would have been had the transactions been effected on the assumed dates.

	Three Months Ended March 31, 2021
	(in millions)
Interest income	$	353.3
Non-interest income	89.6
Net income	180.2

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3. INVESTMENT SECURITIES

The carrying amounts and fair values of investment securities at March 31, 2022 and December 31, 2021 are summarized as follows:

	March 31, 2022
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)		Fair Value
	(in millions)
Held-to-maturity
Private label residential MBS	$	211.1	$	—	$	(18.9)	$	192.2
Tax-exempt	949.9		18.2		(20.4)		947.7
Total HTM securities	$	1,161.0	$	18.2	$	(39.3)	$	1,139.9
Available-for-sale debt securities
CLO	$	2,061.3	$	1.2	$	(7.2)	$	2,055.3
Commercial MBS issued by GSEs	64.9		0.1		(2.8)		62.2
Corporate debt securities	424.6		1.7		(11.0)		415.3
Private label residential MBS	1,444.0		0.3		(101.1)		1,343.2
Residential MBS issued by GSEs	2,073.8		0.2		(169.0)		1,905.0
Tax-exempt	1,021.7		8.6		(37.4)		992.9
Other	75.2		9.2		(6.1)		78.3
Total AFS debt securities	$	7,165.5	$	21.3	$	(334.6)	$	6,852.2
Equity securities
CRA investments	$	54.1	$	—	$	(1.8)	$	52.3
Preferred stock	111.0		4.9		(3.5)		112.4
Total equity securities	$	165.1	$	4.9	$	(5.3)	$	164.7

	December 31, 2021
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)		Fair Value
	(in millions)
Held-to-maturity
Private label residential MBS	$	216.9	$	—	$	(1.6)	$	215.3
Tax-exempt	890.2		43.2		(2.3)		931.1
Total HTM securities	$	1,107.1	$	43.2	$	(3.9)	$	1,146.4
Available-for-sale debt securities
CLO	$	926.0	$	0.5	$	(0.3)	$	926.2
Commercial MBS issued by GSEs	68.2		0.9		(0.6)		68.5
Corporate debt securities	382.7		9.2		(9.0)		382.9
Private label residential MBS	1,528.7		3.5		(24.2)		1,508.0
Residential MBS issued by GSEs	2,027.5		7.3		(41.4)		1,993.4
Tax-exempt	1,145.1		71.2		(1.2)		1,215.1
U.S. treasury securities	13.0		—		—		13.0
Other	75.3		11.0		(4.6)		81.7
Total AFS debt securities	$	6,166.5	$	103.6	$	(81.3)	$	6,188.8
Equity securities
CRA investments	$	45.1	$	—	$	(0.5)	$	44.6
Preferred stock	107.1		7.7		(0.9)		113.9
Total equity securities	$	152.2	$	7.7	$	(1.4)	$	158.5

Securities with carrying amounts of approximately $1.9 billion and $2.2 billion at March 31, 2022 and December 31, 2021, respectively, were pledged for various purposes as required or permitted by law.

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The following tables summarize the Company's debt securities in an unrealized loss position at March 31, 2022 and December 31, 2021, aggregated by major security type and length of time in a continuous unrealized loss position: 

	March 31, 2022
	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
CLO	$	6.8	$	1,101.8	$	0.4	$	63.2	$	7.2	$	1,165.0
Commercial MBS issued by GSEs	1.2		28.6		1.6		17.1		2.8		45.7
Corporate debt securities	11.0		346.3		—		—		11.0		346.3
Private label residential MBS	68.0		1,015.1		33.1		300.1		101.1		1,315.2
Residential MBS issued by GSEs	77.5		1,148.0		91.5		726.8		169.0		1,874.8
Tax-exempt	37.4		677.2		—		—		37.4		677.2
Other	1.6		15.4		4.5		27.5		6.1		42.9
Total AFS securities	$	203.5	$	4,332.4	$	131.1	$	1,134.7	$	334.6	$	5,467.1

	December 31, 2021
	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
CLO	$	0.3	$	170.7	$	—	$	—	$	0.3	$	170.7
Commercial MBS issued by GSEs	0.6		19.5		—		—		0.6		19.5
Corporate debt securities	9.0		107.0		—		—		9.0		107.0
Private label residential MBS	24.2		1,250.0		—		—		24.2		1,250.0
Residential MBS issued by GSEs	32.6		1,355.7		8.8		142.1		41.4		1,497.8
Tax-exempt	1.2		141.4		—		—		1.2		141.4
Other	—		2.0		4.6		27.4		4.6		29.4
Total AFS securities	$	67.9	$	3,046.3	$	13.4	$	169.5	$	81.3	$	3,215.8

The total number of AFS debt securities in an unrealized loss position at March 31, 2022 is 575, compared to 179 at December 31, 2021.

On a quarterly basis, the Company performs an impairment analysis on its AFS debt securities that are 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

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, are highly rated by major rating agencies, and have a long history of no credit losses. 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 continue to be highly rated, 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 that are not considered to be credit-related issues. The Company

31

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.

For the Company's private label residential MBS, which consist of non-agency collateralized mortgage obligations that are 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 consists of highly rated securitization tranches, containing pools of medium to large-sized corporate, high yield bank loans. These are variable rate securities that have an investment grade rating of Single-A or better. The Company has increased its investment in these securities over the past year and unrealized losses on these securities are 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.

Based on the qualitative factors noted above and as the Company does not intend to sell these securities and it is more likely than not that the Company will not be required to sell the securities prior to their anticipated recovery, no credit losses have been recognized on these securities during the three months ended March 31, 2022 and 2021. In addition, as of March 31, 2022 and December 31, 2021, no allowance for credit losses on the Company's AFS securities has been recognized.

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 allowance for credit losses on the Company's HTM debt securities:

	Three Months Ended March 31, 2022
	Balance, December 31, 2021		Recovery of Credit Losses		Write-offs		Recoveries		Balance, March 31, 2022
	(in millions)
Held-to-maturity debt securities
Tax-exempt	$	5.2	$	(2.0)	$	—	$	—	$	3.2

	Three Months Ended March 31, 2021:
	Balance, December 31, 2020		Provision for Credit Losses		Write-offs		Recoveries		Balance March 31, 2021
	(in millions)
Held-to-maturity debt securities
Tax-exempt	$	6.8	$	2.4	$	—	$	—	$	9.2

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 $3.3 million and $3.0 million at March 31, 2022 and December 31, 2021, respectively, and is excluded from the estimate of expected credit losses.

32

The following tables summarize the carrying amount of the Company’s investment ratings position as of March 31, 2022 and December 31, 2021, which are updated quarterly and used to monitor the credit quality of the Company's securities: 

	March 31, 2022
	AAA		Split-rated AAA/AA+		AA+ to AA-		A+ to A-		BBB+ to BBB-		BB+ and below		Unrated		Totals
	(in millions)
Held-to-maturity
Private label residential MBS	$	—	$	—	$	—	$	—	$	—	$	—	$	211.1	$	211.1
Tax-exempt	—		—		—		—		—		—		949.9		949.9
Total HTM securities (1)	$	—	$	—	$	—	$	—	$	—	$	—	$	1,161.0	$	1,161.0
Available-for-sale debt securities
CLO	$	123.5	$	—	$	1,676.1	$	255.7	$	—	$	—	$	—	$	2,055.3
Commercial MBS issued by GSEs	—		62.2		—		—		—		—		—		62.2
Corporate debt securities	—		—		—		48.0		367.3		—		—		415.3
Private label residential MBS	1,261.3		—		81.0		—		0.8		—		0.1		1,343.2
Residential MBS issued by GSEs	—		1,905.0		—		—		—		—		—		1,905.0
Tax-exempt	17.7		16.6		443.3		482.3		—		—		33.0		992.9
Other	—		—		10.8		9.8		30.1		8.5		19.1		78.3
Total AFS securities (1)	$	1,402.5	$	1,983.8	$	2,211.2	$	795.8	$	398.2	$	8.5	$	52.2	$	6,852.2
Equity securities
CRA investments	$	—	$	26.2	$	—	$	—	$	—	$	—	$	26.1	$	52.3
Preferred stock	—		—		—		—		78.0		19.2		15.2		112.4
Total equity securities (1)	$	—	$	26.2	$	—	$	—	$	78.0	$	19.2	$	41.3	$	164.7

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

	December 31, 2021
	AAA		Split-rated AAA/AA+		AA+ to AA-		A+ to A-		BBB+ to BBB-		BB+ and below		Unrated		Totals
	(in millions)
Held-to-maturity
Private label residential MBS	$	—	$	—	$	—	$	—	$	—	$	—	$	216.9	$	216.9
Tax-exempt	—		—		—		—		—		—		890.2		890.2
Total HTM securities (1)	$	—	$	—	$	—	$	—	$	—	$	—	$	1,107.1	$	1,107.1
Available-for-sale debt securities
CLO	$	45.0	$	—	$	635.6	$	245.6	$	—	$	—	$	—	$	926.2
Commercial MBS issued by GSEs	—		68.5		—		—		—		—		—		68.5
Corporate debt securities	—		—		—		45.3		318.7		18.9		—		382.9
Private label residential MBS	1,419.6		—		87.4		—		0.9		—		0.1		1,508.0
Residential MBS issued by GSEs	—		1,993.4		—		—		—		—		—		1,993.4
Tax-exempt	43.2		40.4		469.1		628.9		—		—		33.5		1,215.1
U.S. treasury securities	—		13.0		—		—		—		—		—		13.0
Other	—		—		12.1		10.0		30.2		9.6		19.8		81.7
Total AFS securities (1)	$	1,507.8	$	2,115.3	$	1,204.2	$	929.8	$	349.8	$	28.5	$	53.4	$	6,188.8
Equity securities
CRA investments	$	—	$	27.3	$	—	$	—	$	—	$	—	$	17.3	$	44.6
Preferred stock	—		—		—		—		79.3		20.2		14.4		113.9
Total equity securities (1)	$	—	$	27.3	$	—	$	—	$	79.3	$	20.2	$	31.7	$	158.5

(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, 2022 the Company does not have a significant amount of investment securities that were past due or on nonaccrual status.

33

The amortized cost and fair value of the Company's debt securities as of March 31, 2022, 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, 2022
	Amortized Cost		Estimated Fair Value
	(in millions)
Held-to-maturity
Due in one year or less	$	41.6	$	41.7
After one year through five years	18.2		18.0
After five years through ten years	7.2		7.5
After ten years	882.9		880.5
Mortgage-backed securities	211.1		192.2
Total HTM securities	$	1,161.0	$	1,139.9
Available-for-sale
Due in one year or less	$	1.5	$	1.5
After one year through five years	120.6		117.9
After five years through ten years	1,055.7		1,046.1
After ten years	2,405.0		2,376.3
Mortgage-backed securities	3,582.7		3,310.4
Total AFS securities	$	7,165.5	$	6,852.2

During the three months ended March 31, 2022, the Company sold certain AFS securities as part of the Company's interest rate management actions to secure gains on securities, primarily tax-exempt municipal securities that were purchased at a discount at the onset of the COVID-19 pandemic. These securities had a carrying value of $107.3 million and a gain of $6.9 million was recognized on the sale of these securities. The Company did not have significant sales of investments securities during the three months ended March 31, 2021.

34

4. LOANS HELD FOR SALE

The Company began acquiring loans held for sale through the AmeriHome acquisition and as part of its ongoing mortgage banking business, the Company continues to purchase residential mortgage loans for sale or securitization. The following is a summary of loans HFS by type:

	March 31, 2022		December 31, 2021
	(in millions)
Government-insured or guaranteed:
EBO (1)	$	1,805.6	$	1,692.8
Non-EBO	1,465.2		1,396.6
Total government-insured or guaranteed	3,270.8		3,089.4
Agency-conforming	1,483.6		2,482.9
Non-agency	7.2		62.8
Total loans HFS	$	4,761.6	$	5,635.1

(1)    EBO loans are delinquent loans repurchased under the terms of the Ginnie Mae MBS program that can be repooled or resold when loans are brought current either through the borrower's reperformance or through completion of a loan modification.

As of March 31, 2022 and December 31, 2021, there were no loans HFS that were pledged to secure warehouse borrowings.

The following is a summary of the net gain on loan purchase, origination, and sale activities:

	Three Months Ended March 31, 2022
	(in millions)
Mortgage servicing rights capitalized upon sale of loans	$	204.1
Net proceeds from sale of loans (1)	(336.9)
Provision for and change in estimate of liability for losses under representations and warranties, net	0.8
Change in fair value of loans held for sale	(66.2)
Change in fair value of derivatives related to loans HFS:
Unrealized gain on derivatives	81.2
Realized gain on derivatives	135.6
Total change in fair value of derivatives	216.8
Net gain on loans held for sale	$	18.6
Loan acquisition and origination fees	18.3
Net gain on loan origination and sale activities	$	36.9

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

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5. LOANS, LEASES AND ALLOWANCE FOR CREDIT LOSSES

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

	March 31, 2022		December 31, 2021
	(in millions)
Warehouse lending	$	4,530.2	$	5,155.9
Municipal & nonprofit	1,497.0		1,579.2
Tech & innovation	1,538.5		1,417.8
Equity fund resources	3,688.5		3,829.8
Other commercial and industrial	6,752.5		6,465.7
CRE - owner occupied	1,635.7		1,723.7
Hotel franchise finance	2,694.7		2,534.0
Other CRE - non-owner occupied	4,115.1		3,951.8
Residential	11,234.9		9,242.8
Construction and land development	3,264.4		3,005.8
Other	167.6		168.9
Total loans HFI	41,119.1		39,075.4
Allowance for credit losses	(257.6)		(252.5)
Total loans HFI, net of allowance	$	40,861.5	$	38,822.9

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 allowance for credit losses. Net deferred loan fees of $92.5 million and $85.7 million reduced the carrying value of loans as of March 31, 2022 and December 31, 2021, respectively. Net unamortized purchase premiums on acquired and purchased loans of $205.8 million and $184.8 million increased the carrying value of loans as of March 31, 2022 and December 31, 2021, 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, 2022
	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)
Tech & innovation	$	—	$	18.1	$	18.1	$	—
Other commercial and industrial	10.4		2.0		12.4		—
CRE - owner occupied	8.3		2.2		10.5		—
Hotel franchise finance	—		10.2		10.2		—
Other CRE - non-owner occupied	12.5		1.2		13.7		—
Residential	—		22.6		22.6		—
Construction and land development	3.3		—		3.3		—
Other	0.2		—		0.2		—
Total	$	34.7	$	56.3	$	91.0	$	—

36

	December 31, 2021
	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)
Tech & innovation	$	2.1	$	11.2	$	13.3	$	—
Equity fund resources	—		0.6		0.6		—
Other commercial and industrial	12.7		3.4		16.1		—
CRE - owner occupied	11.6		1.4		13.0		—
Other CRE - non-owner occupied	11.3		1.8		13.1		—
Residential	—		15.1		15.1		—
Construction and land development	1.0		—		1.0		—
Other	0.2		0.2		0.4		—
Total	$	38.9	$	33.7	$	72.6	$	—

The reduction in interest income associated with loans on nonaccrual status was approximately $1.1 million and $1.5 million for the three months ended March 31, 2022 and 2021, respectively.

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

	March 31, 2022
	Current		30-59 Days Past Due		60-89 Days Past Due		Over 90 days Past Due		Total Past Due		Total
	(in millions)
Warehouse lending	$	4,530.2	$	—	$	—	$	—	$	—	$	4,530.2
Municipal & nonprofit	1,497.0		—		—		—		—		1,497.0
Tech & innovation	1,538.5		—		—		—		—		1,538.5
Equity fund resources	3,688.5		—		—		—		—		3,688.5
Other commercial and industrial	6,742.5		9.8		0.2		—		10.0		6,752.5
CRE - owner occupied	1,635.7		—		—		—		—		1,635.7
Hotel franchise finance	2,694.7		—		—		—		—		2,694.7
Other CRE - non-owner occupied	4,109.9		5.2		—		—		5.2		4,115.1
Residential	11,194.7		31.6		8.6		—		40.2		11,234.9
Construction and land development	3,262.4		2.0		—		—		2.0		3,264.4
Other	167.4		0.2		—		—		0.2		167.6
Total loans	$	41,061.5	$	48.8	$	8.8	$	—	$	57.6	$	41,119.1

	December 31, 2021
	Current		30-59 Days Past Due		60-89 Days Past Due		Over 90 days Past Due		Total Past Due		Total
	(in millions)
Warehouse lending	$	5,155.9	$	—	$	—	$	—	$	—	$	5,155.9
Municipal & nonprofit	1,579.2		—		—		—		—		1,579.2
Tech & innovation	1,417.8		—		—		—		—		1,417.8
Equity fund resources	3,829.8		—		—		—		—		3,829.8
Other commercial and industrial	6,465.7		—		—		—		—		6,465.7
CRE - owner occupied	1,723.7		—		—		—		—		1,723.7
Hotel franchise finance	2,534.0		—		—		—		—		2,534.0
Other CRE - non-owner occupied	3,951.8		—		—		—		—		3,951.8
Residential	9,190.4		50.7		1.7		—		52.4		9,242.8
Construction and land development	3,005.8		—		—		—		—		3,005.8
Other	168.8		0.1		—		—		0.1		168.9
Total loans	$	39,022.9	$	50.8	$	1.7	$	—	$	52.5	$	39,075.4

37

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 risk rating categories are described in "Note 1. Summary of Significant Accounting Policies" of these Notes to Unaudited Consolidated Financial Statements. 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
March 31, 2022	2022		2021		2020		2019		2018		Prior
	(in millions)
Warehouse lending
Pass	$	—	$	223.6	$	31.4	$	—	$	—	$	—	$	4,275.2	$	4,530.2
Special mention	—		—		—		—		—		—		—		—
Classified	—		—		—		—		—		—		—		—
Total	$	—	$	223.6	$	31.4	$	—	$	—	$	—	$	4,275.2	$	4,530.2
Municipal & nonprofit
Pass	$	5.0	$	141.0	$	194.1	$	74.4	$	50.1	$	1,022.8	$	3.6	$	1,491.0
Special mention	—		—		—		6.0		—		—		—		6.0
Classified	—		—		—		—		—		—		—		—
Total	$	5.0	$	141.0	$	194.1	$	80.4	$	50.1	$	1,022.8	$	3.6	$	1,497.0
Tech & innovation
Pass	$	122.9	$	752.4	$	118.8	$	92.7	$	5.6	$	0.6	$	383.6	$	1,476.6
Special mention	7.0		8.4		3.5		1.5		—		—		14.4		34.8
Classified	—		2.5		15.7		5.4		—		—		3.5		27.1
Total	$	129.9	$	763.3	$	138.0	$	99.6	$	5.6	$	0.6	$	401.5	$	1,538.5
Equity fund resources
Pass	$	—	$	13.6	$	—	$	—	$	0.3	$	1.9	$	3,672.7	$	3,688.5
Special mention	—		—		—		—		—		—		—		—
Classified	—		—		—		—		—		—		—		—
Total	$	—	$	13.6	$	—	$	—	$	0.3	$	1.9	$	3,672.7	$	3,688.5
Other commercial and industrial
Pass	$	826.1	$	2,400.9	$	306.4	$	334.6	$	198.5	$	170.2	$	2,408.2	$	6,644.9
Special mention	3.3		5.8		19.1		20.2		17.4		—		12.6		78.4
Classified	0.3		0.8		13.2		7.0		1.6		1.4		4.9		29.2
Total	$	829.7	$	2,407.5	$	338.7	$	361.8	$	217.5	$	171.6	$	2,425.7	$	6,752.5
CRE - owner occupied
Pass	$	56.4	$	377.4	$	195.8	$	190.1	$	190.5	$	539.8	$	55.7	$	1,605.7
Special mention	0.4		—		—		0.2		—		—		—		0.6
Classified	7.6		2.2		2.6		—		5.5		11.5		—		29.4
Total	$	64.4	$	379.6	$	198.4	$	190.3	$	196.0	$	551.3	$	55.7	$	1,635.7
Hotel franchise finance
Pass	$	238.3	$	697.0	$	144.7	$	584.8	$	352.0	$	197.6	$	123.0	$	2,337.4
Special mention	—		—		41.8		132.1		—		—		—		173.9
Classified	8.6		20.3		—		98.9		45.4		10.2		—		183.4
Total	$	246.9	$	717.3	$	186.5	$	815.8	$	397.4	$	207.8	$	123.0	$	2,694.7
Other CRE - non-owner occupied
Pass	$	445.2	$	1,324.8	$	720.5	$	592.0	$	215.1	$	421.6	$	313.8	$	4,033.0
Special mention	—		19.7		—		21.6		—		5.7		—		47.0
Classified	—		—		10.8		4.1		4.3		15.9		—		35.1
Total	$	445.2	$	1,344.5	$	731.3	$	617.7	$	219.4	$	443.2	$	313.8	$	4,115.1

38

	Term Loan Amortized Cost Basis by Origination Year												Revolving Loans Amortized Cost Basis		Total
March 31, 2022	2022		2021		2020		2019		2018		Prior
	(in millions)
Residential
Pass	$	1,127.6	$	8,469.1	$	957.4	$	351.8	$	171.4	$	101.1	$	33.9	$	11,212.3
Special mention	—		—		—		—		—		—		—		—
Classified	—		15.1		0.6		3.8		0.5		2.6		—		22.6
Total	$	1,127.6	$	8,484.2	$	958.0	$	355.6	$	171.9	$	103.7	$	33.9	$	11,234.9
Construction and land development
Pass	$	297.7	$	1,065.0	$	622.9	$	245.1	$	73.5	$	3.2	$	931.5	$	3,238.9
Special mention	—		—		9.0		—		—		—		—		9.0
Classified	—		1.0		12.6		0.6		—		—		2.3		16.5
Total	$	297.7	$	1,066.0	$	644.5	$	245.7	$	73.5	$	3.2	$	933.8	$	3,264.4
Other
Pass	$	1.9	$	15.5	$	8.3	$	3.6	$	4.1	$	83.6	$	49.9	$	166.9
Special mention	—		—		—		—		—		0.2		—		0.2
Classified	—		—		—		0.1		0.1		0.3		—		0.5
Total	$	1.9	$	15.5	$	8.3	$	3.7	$	4.2	$	84.1	$	49.9	$	167.6
Total by Risk Category
Pass	$	3,121.1	$	15,480.3	$	3,300.3	$	2,469.1	$	1,261.1	$	2,542.4	$	12,251.1	$	40,425.4
Special mention	10.7		33.9		73.4		181.6		17.4		5.9		27.0		349.9
Classified	16.5		41.9		55.5		119.9		57.4		41.9		10.7		343.8
Total	$	3,148.3	$	15,556.1	$	3,429.2	$	2,770.6	$	1,335.9	$	2,590.2	$	12,288.8	$	41,119.1

	Term Loan Amortized Cost Basis by Origination Year												Revolving Loans Amortized Cost Basis		Total
December 31, 2021	2021		2020		2019		2018		2017		Prior
	(in millions)
Warehouse lending
Pass	$	242.6	$	12.5	$	—	$	—	$	—	$	—	$	4,900.8	$	5,155.9
Special mention	—		—		—		—		—		—		—		—
Classified	—		—		—		—		—		—		—		—
Total	$	242.6	$	12.5	$	—	$	—	$	—	$	—	$	4,900.8	$	5,155.9
Municipal & nonprofit
Pass	$	129.5	$	195.0	$	101.2	$	52.9	$	219.3	$	877.8	$	3.5	$	1,579.2
Special mention	—		—		—		—		—		—		—		—
Classified	—		—		—		—		—		—		—		—
Total	$	129.5	$	195.0	$	101.2	$	52.9	$	219.3	$	877.8	$	3.5	$	1,579.2
Tech & innovation
Pass	$	762.6	$	157.1	$	101.1	$	6.1	$	—	$	0.6	$	334.4	$	1,361.9
Special mention	26.0		4.7		—		—		—		—		8.1		38.8
Classified	3.0		5.2		7.5		—		—		—		1.4		17.1
Total	$	791.6	$	167.0	$	108.6	$	6.1	$	—	$	0.6	$	343.9	$	1,417.8
Equity fund resources
Pass	$	9.0	$	1.7	$	—	$	0.3	$	2.2	$	0.2	$	3,816.4	$	3,829.8
Special mention	—		—		—		—		—		—		—		—
Classified	—		—		—		—		—		—		—		—
Total	$	9.0	$	1.7	$	—	$	0.3	$	2.2	$	0.2	$	3,816.4	$	3,829.8
Other commercial and industrial
Pass	$	2,910.8	$	360.0	$	387.1	$	210.3	$	80.2	$	97.8	$	2,306.0	$	6,352.2
Special mention	5.4		26.7		22.0		17.6		0.1		—		15.0		86.8
Classified	—		10.1		5.6		2.2		1.4		0.2		7.2		26.7
Total	$	2,916.2	$	396.8	$	414.7	$	230.1	$	81.7	$	98.0	$	2,328.2	$	6,465.7

39

	Term Loan Amortized Cost Basis by Origination Year												Revolving Loans Amortized Cost Basis		Total
December 31, 2021	2021		2020		2019		2018		2017		Prior
	(in millions)
CRE - owner occupied
Pass	$	417.2	$	198.5	$	220.1	$	190.4	$	278.0	$	322.4	$	55.6	$	1,682.2
Special mention	—		—		0.3		10.1		—		1.5		0.4		12.3
Classified	2.2		2.6		1.0		4.6		8.0		10.7		0.1		29.2
Total	$	419.4	$	201.1	$	221.4	$	205.1	$	286.0	$	334.6	$	56.1	$	1,723.7
Hotel franchise finance
Pass	$	721.3	$	205.3	$	658.8	$	332.2	$	135.5	$	63.5	$	123.0	$	2,239.6
Special mention	—		—		87.6		51.1		—		—		—		138.7
Classified	30.3		—		99.2		15.9		10.3		—		—		155.7
Total	$	751.6	$	205.3	$	845.6	$	399.2	$	145.8	$	63.5	$	123.0	$	2,534.0
Other CRE - non-owner occupied
Pass	$	1,398.2	$	754.8	$	673.0	$	278.8	$	185.8	$	283.5	$	315.1	$	3,889.2
Special mention	14.8		—		9.8		—		—		1.7		—		26.3
Classified	—		—		4.2		4.5		0.3		16.4		10.9		36.3
Total	$	1,413.0	$	754.8	$	687.0	$	283.3	$	186.1	$	301.6	$	326.0	$	3,951.8
Residential
Pass	$	7,459.3	$	1,018.4	$	395.5	$	201.3	$	41.6	$	75.5	$	36.1	$	9,227.7
Special mention	—		—		—		—		—		—		—		—
Classified	8.9		0.9		3.6		0.5		0.1		1.1		—		15.1
Total	$	7,468.2	$	1,019.3	$	399.1	$	201.8	$	41.7	$	76.6	$	36.1	$	9,242.8
Construction and land development
Pass	$	957.6	$	632.3	$	394.0	$	112.2	$	3.5	$	0.1	$	869.8	$	2,969.5
Special mention	—		22.5		—		—		5.6		—		—		28.1
Classified	1.0		4.3		0.6		—		—		—		2.3		8.2
Total	$	958.6	$	659.1	$	394.6	$	112.2	$	9.1	$	0.1	$	872.1	$	3,005.8
Other
Pass	$	15.7	$	11.6	$	3.7	$	4.3	$	4.4	$	82.0	$	46.4	$	168.1
Special mention	—		—		—		—		—		0.1		—		0.1
Classified	—		—		0.1		0.1		—		0.5		—		0.7
Total	$	15.7	$	11.6	$	3.8	$	4.4	$	4.4	$	82.6	$	46.4	$	168.9
Total by Risk Category
Pass	$	15,023.8	$	3,547.2	$	2,934.5	$	1,388.8	$	950.5	$	1,803.4	$	12,807.1	$	38,455.3
Special mention	46.2		53.9		119.7		78.8		5.7		3.3		23.5		331.1
Classified	45.4		23.1		121.8		27.8		20.1		28.9		21.9		289.0
Total	$	15,115.4	$	3,624.2	$	3,176.0	$	1,495.4	$	976.3	$	1,835.6	$	12,852.5	$	39,075.4

Troubled Debt Restructurings

A TDR loan is a loan on which the Company, for reasons related to a borrower’s financial difficulties, grants a concession to the borrower that the Company would not otherwise consider. The loan terms that have been modified or restructured due to a borrower’s financial situation include, but are not limited to, a reduction in the stated interest rate, an extension of the maturity or renewal of the loan at an interest rate below current market, a reduction in the face amount of the debt, a reduction in the accrued interest, or deferral of interest payments. The majority of the Company's modifications are extensions in terms or deferral of payments which result in no lost principal or interest followed by reductions in interest rates or accrued interest. Consistent with regulatory guidance, a TDR loan that is subsequently modified in another restructuring agreement but has shown sustained performance and classification as a TDR, will be removed from TDR status provided that the modified terms were market-based at the time of modification.

The CARES Act, signed into law on March 27, 2020, permitted financial institutions to suspend requirements under GAAP for loan modifications to borrowers affected by COVID-19 that would otherwise be characterized as TDRs and suspend any determination related thereto if (i) the loan modification was made between March 1, 2020 and December 31, 2020 and (ii) the applicable loan was not more than 30 days past due as of December 31, 2019. The Consolidated Appropriations Act, 2021 extended these provisions through January 1, 2022, which has not subsequently been extended further. In addition, federal bank

40

regulatory authorities issued guidance to encourage financial institutions to make loan modifications for borrowers affected by COVID-19 and assured financial institutions that they will neither receive supervisory criticism for such prudent loan modifications, nor be required by examiners to automatically categorize COVID-19-related loan modifications as TDRs. The Company applied this guidance to qualifying loan modifications through December 31, 2021. As of March 31, 2022, the Company has a net balance of $131.4 million of prior outstanding modifications on HFI commercial loans made during the suspension period that met these conditions, none of which involve loan payment deferrals. Further, residential HFI mortgage loans in forbearance have a net balance of $12.9 million as of March 31, 2022.

The following table presents TDR loans:

	March 31, 2022			December 31, 2021
	Number of Loans	Recorded Investment		Number of Loans	Recorded Investment
	(dollars in millions)
Tech & innovation	1	$	4.1	2	$	2.1
Other commercial and industrial	7	5.9		7	6.2
CRE - owner occupied	1	0.5		1	0.5
Other CRE - non-owner occupied	5	10.7		5	11.0
Construction and land development	1	1.0		1	1.0
Total	15	$	22.2	16	$	20.8

The allowance for credit losses on TDR loans totaled $1.0 million and zero as of March 31, 2022 and December 31, 2021, respectively. As of March 31, 2022, outstanding commitments on TDR loans totaled $4.0 million. There were no outstanding commitments on TDR loans as of December 31, 2021.

During the three months ended March 31, 2022, the Company had one new TDR loan with a recorded investment of $4.1 million. No principal amounts were forgiven and there were no waived fees or other expenses resulting from this TDR loan. As of December 31, 2021, the Company's TDR loans totaled $20.8 million. During the three months ended March 31, 2021, the Company had 3 new TDR loans with a recorded investment of $4.7 million. No principal amounts were forgiven and there were no waived fees or other expenses resulting from these TDR loans.

A TDR loan is deemed to have a payment default when it becomes past due 90 days under the modified terms, goes on nonaccrual status, or is restructured again. Payment defaults, along with other qualitative indicators, are considered by management in the determination of the allowance for credit losses. During the three months ended March 31, 2022 and 2021, there were no loans for which there was a payment default within 12 months following the modification.

Collateral-Dependent Loans

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

	March 31, 2022						December 31, 2021
	Real Estate Collateral		Other Collateral		Total		Real Estate Collateral		Other Collateral		Total
	(in millions)
Other commercial and industrial	$	—	$	16.4	$	16.4	$	—	$	12.5	$	12.5
CRE - owner occupied	23.3		—		23.3		23.0		—		23.0
Hotel franchise finance	183.4		—		183.4		155.7		—		155.7
Other CRE - non-owner occupied	31.0		—		31.0		31.6		—		31.6
Construction and land development	12.3		—		12.3		3.9		—		3.9
Other	—		0.1		0.1		—		0.1		0.1
Total	$	250.0	$	16.5	$	266.5	$	214.2	$	12.6	$	226.8

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, 2022.

41

Allowance for Credit Losses

The allowance for credit losses consists of the allowance for credit losses on funded HFI loans and an allowance for credit losses on unfunded loan commitments. The allowance for credit losses on HTM securities is estimated separately from loans, see "Note 3. Investment Securities" of these Notes to Unaudited Consolidated Financial Statements for further discussion. Management considers the level of allowance for credit losses to be a reasonable and supportable estimate of expected credit losses inherent within the Company's HFI loan portfolio as of March 31, 2022.

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

	Three Months Ended March 31, 2022
	Balance, December 31, 2021		Provision for (Recovery of) Credit Losses		Write-offs		Recoveries		Balance, March 31, 2022
	(in millions)
Warehouse lending	$	3.0	$	(0.1)	$	—	$	—	$	2.9
Municipal & nonprofit	13.7		(0.3)		—		—		13.4
Tech & innovation	25.7		0.3		—		(2.0)		28.0
Equity fund resources	9.6		(3.0)		—		—		6.6
Other commercial and industrial	103.6		14.3		2.6		(0.4)		115.7
CRE - owner occupied	10.6		(2.5)		—		—		8.1
Hotel franchise finance	41.5		(10.9)		—		—		30.6
Other CRE - non-owner occupied	16.9		(1.6)		—		—		15.3
Residential	12.5		11.3		—		—		23.8
Construction and land development	12.5		(1.8)		—		—		10.7
Other	2.9		(0.4)		—		—		2.5
Total	$	252.5	$	5.3	$	2.6	$	(2.4)	$	257.6

	Three Months Ended March 31, 2021
	Balance, December 31, 2020		Provision for (Recovery of) Credit Losses		Write-offs		Recoveries		Balance, March 31, 2021
	(in millions)
Warehouse lending	$	3.4	$	0.2	$	—	$	—	$	3.6
Municipal & nonprofit	15.9		(0.7)		—		—		15.2
Tech & innovation	33.4		(10.6)		—		(0.2)		23.0
Equity fund resources	1.9		(1.0)		—		—		0.9
Other commercial and industrial	94.7		(16.5)		0.1		(0.3)		78.4
CRE - owner occupied	18.6		(8.9)		—		—		9.7
Hotel franchise finance	43.3		6.1		—		—		49.4
Other CRE - non-owner occupied	39.9		(5.4)		2.0		(0.2)		32.7
Residential	0.8		2.4		—		—		3.2
Construction and land development	22.0		3.9		—		—		25.9
Other	5.0		0.1		—		—		5.1
Total	$	278.9	$	(30.4)	$	2.1	$	(0.7)	$	247.1

Accrued interest receivable on loans totaled $201.1 million and $197.6 million at March 31, 2022 and December 31, 2021, respectively, and is excluded from the estimate of credit losses.

42

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

The below table reflects the activity in the allowance for credit losses on unfunded loan commitments:

	Three Months Ended March 31,
	2022		2021
	(in millions)
Balance, beginning of period	$	37.6	$	37.0
Provision for (recovery of) credit losses	5.7		(4.4)
Balance, end of period	$	43.3	$	32.6

The following tables disaggregate the Company's allowance for credit losses on funded HFI loans and loan balances by measurement methodology:

	March 31, 2022
	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	$	4,530.2	$	—	$	4,530.2	$	2.9	$	—	$	2.9
Municipal & nonprofit	1,497.0		—		1,497.0		13.4		—		13.4
Tech & innovation	1,511.5		27.0		1,538.5		23.7		4.3		28.0
Equity fund resources	3,688.5		—		3,688.5		6.6		—		6.6
Other commercial and industrial	6,726.5		26.0		6,752.5		112.9		2.8		115.7
CRE - owner occupied	1,609.7		26.0		1,635.7		8.1		—		8.1
Hotel franchise finance	2,511.3		183.4		2,694.7		24.1		6.5		30.6
Other CRE - non-owner occupied	4,081.2		33.9		4,115.1		15.3		—		15.3
Residential	11,234.9		—		11,234.9		23.8		—		23.8
Construction and land development	3,247.9		16.5		3,264.4		10.7		—		10.7
Other	167.3		0.3		167.6		2.5		—		2.5
Total	$	40,806.0	$	313.1	$	41,119.1	$	244.0	$	13.6	$	257.6

	December 31, 2021
	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	$	5,155.9	$	—	$	5,155.9	$	3.0	$	—	$	3.0
Municipal & nonprofit	1,579.2		—		1,579.2		13.7		—		13.7
Tech & innovation	1,400.8		17.0		1,417.8		22.9		2.8		25.7
Equity fund resources	3,829.8		—		3,829.8		9.6		—		9.6
Other commercial and industrial	6,442.7		23.0		6,465.7		101.1		2.5		103.6
CRE - owner occupied	1,699.3		24.4		1,723.7		10.6		—		10.6
Hotel franchise finance	2,378.3		155.7		2,534.0		30.7		10.8		41.5
Other CRE - non-owner occupied	3,917.3		34.5		3,951.8		16.9		—		16.9
Residential	9,242.8		—		9,242.8		12.5		—		12.5
Construction and land development	2,997.6		8.2		3,005.8		12.5		—		12.5
Other	168.6		0.3		168.9		2.9		—		2.9
Total	$	38,812.3	$	263.1	$	39,075.4	$	236.4	$	16.1	$	252.5

Loan Purchases and Sales

Loan purchases during the three months ended March 31, 2022 and 2021 totaled $2.4 billion and $1.0 billion, respectively, which primarily consisted of residential loan purchases. There were no loans purchased with more-than-insignificant deterioration in credit quality during the three months ended March 31, 2022 and 2021.

During the three months ended March 31, 2022 and 2021, the Company did not have significant sales of HFI loans.

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6. MORTGAGE SERVICING RIGHTS

The Company acquired MSRs initially as part of the AmeriHome acquisition and continues to generate new MSRs from its mortgage banking business. The following table presents the changes in fair value of the Company's MSR assets and other information related to its servicing portfolio:

	Three Months Ended March 31, 2022
	(in millions)
Balance, December 31, 2021	$	698.0
Additions from loans sold with servicing rights retained	204.1
MSRs sold	—
Change in fair value	81.4
Realization of cash flows	(33.2)
Balance, March 31, 2022	$	950.3
Unpaid principal balance of mortgage loans serviced for others	$	65,546.7

Changes in the fair value of MSRs are recorded as part of 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. However, during the three months ended March 31, 2022, the Company did not have MSR sales. As of March 31, 2022, the Company has a remaining receivable balance of $58.4 million related to holdbacks on prior MSR sales for pending servicing transfer, which was recorded as part of 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 $42.9 million for the three months ended March 31, 2022, which are recorded as part of 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, 2022 and December 31, 2021, net servicing advances totaled $62.8 million and $81.6 million, respectively, which are recorded as part of 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, 2022
	(in millions)
Fair value of mortgage servicing rights	$	950.3
Increase (decrease) in fair value resulting from:
Interest rate change of 50 basis points
Adverse change	(30.1)
Favorable change	17.7
Discount rate change of 50 basis points
Increase	(18.2)
Decrease	18.9
Conditional prepayment rate change of 1%
Increase	(24.3)
Decrease	26.9
Cost to service change of 10%
Increase	(11.9)
Decrease	11.9

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.

7. OTHER BORROWINGS

The following table summarizes the Company’s borrowings as of March 31, 2022 and December 31, 2021: 

	March 31, 2022		December 31, 2021
	(in millions)
Short-Term:
Federal funds purchased	$	—	$	675.0
Customer repurchase agreements	18.0		16.6
Secured borrowings	52.3		35.3
Total short-term borrowings	$	70.3	$	726.9
Long-Term:
AmeriHome senior notes, net of fair value adjustment	$	317.5	$	317.9
Credit linked notes, net of debt issuance costs	445.5		457.1
Total long-term borrowings	$	763.0	$	775.0
Total other borrowings	$	833.3	$	1,501.9

Short-Term Borrowings

Federal Funds Lines of Credit

The Company maintains federal fund lines of credit totaling $3.5 billion as of March 31, 2022, which have rates comparable to the federal funds effective rate plus 0.10% to 0.20%. As of March 31, 2022, there were no outstanding balances on the Company's federal fund lines. As of December 31, 2021, there were $675.0 million outstanding balances on the Company's federal fund lines of credit.

FHLB Advances

The Company also maintains secured 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. At March 31, 2022, the Company had no borrowings under its lines of credit with the FHLB. As of March 31, 2022 and December

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31, 2021, the Company had additional available credit with the FHLB of approximately $9.9 billion and $7.8 billion, respectively, and with the FRB of approximately $4.1 billion and $3.4 billion, respectively.

Repurchase Agreements

Other short-term borrowing sources available to the Company include customer repurchase agreements, which totaled $18.0 million and $16.6 million as of March 31, 2022 and December 31, 2021, respectively. The weighted average rate on customer repurchase agreements was 0.14% and 0.15% as of March 31, 2022 and December 31, 2021, respectively.

Secured Borrowings

Transfers of loans HFS not qualifying for sales accounting treatment resulted in recognition of secured borrowings of $52.3 million at March 31, 2022 and $35.3 million at December 31, 2021.

Warehouse Borrowings

The Company assumed warehouse borrowing lines of credit as part of the AmeriHome acquisition, which 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, 2022, the Company had access to approximately $1.0 billion in uncommitted warehouse funding, of which no amounts were drawn.

Long-Term Borrowings

AmeriHome Senior Notes

Prior to the Company's acquisition of AmeriHome, in October 2020, AmeriHome issued senior notes with an aggregate principal amount of $300.0 million, maturing on October 26, 2028. The senior notes accrue interest at a rate of 6.50% per annum, paid semiannually. The senior notes contain provisions that allow for redemption of up to 40% of the original aggregate principal amount of the notes during the first three years after issuance at a price equal to 106.50%, plus accrued and unpaid interest. After this three-year period, AmeriHome may redeem some or all of the senior notes at a price equal to 103.25% of the outstanding principal amount, plus accrued and unpaid interest. In 2025, the redemption price of these senior notes declines to 100% of the outstanding principal balance. The carrying amount of the senior notes includes a fair value adjustment (premium) of $19.3 million recognized as of the acquisition date that is being amortized over the term of the notes. The carrying value of these notes totaled $317.5 million and $317.9 million as of March 31, 2022 and December 31, 2021, respectively.

Credit Linked Notes

On June 28, 2021, the Company issued $242.0 million aggregate principal amount of senior unsecured credit linked notes, which were recorded net of $2.9 million in debt issuance costs. The notes mature on December 30, 2024 and accrue interest at a rate equal to three-month LIBOR plus 5.50%, (which will convert to SOFR upon the discontinuation of LIBOR in June 2023), payable quarterly. The notes effectively transfer the risk of first losses on a $1.1 billion reference pool of the Company's warehouse loans to the purchasers of the notes. In the event of a failure to pay by the relevant mortgage originator, insolvency of the relevant mortgage originator, or restructuring of such loans that results in a loss on a loan included in the reference pools, the principal balance of the notes will be reduced to the extent of such loss and a gain on recovery of credit guarantees will be recognized within non-interest income in the Consolidated Income Statement. The purchasers of the notes have the option to acquire the underlying mortgage loan collateralizing the reference warehouse line of credit in the event of obligor default.

On December 29, 2021, the Company issued $227.6 million aggregate principal amount of senior unsecured credit linked notes, which were recorded net of $3.0 million in debt issuance costs. 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%), maturing on July 25, 2059. The notes effectively transfer the risk of first losses on a $4.3 billion reference pool of the Company's loans purchased under its residential mortgage purchase program to the purchasers of the notes. The principal and interest payable on the 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

46

allocated to reduce the class principal amount and (for modifications) the current interest of the notes in reverse order of class priority.

Losses on the warehouse lines of credit and residential mortgages have not generally been significant. The carrying value of these notes totaled $445.5 million and $457.1 million as of March 31, 2022 and December 31, 2021, respectively.

8. QUALIFYING DEBT

Subordinated Debt

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

March 31, 2022
Description	Issuance Date	Maturity Date	Interest Rate		Principal		Debt Issuance Costs at Origination
					(in millions)
WAL fixed-to-variable-rate (1)	June 2021	June 15, 2031	3.00	%	600.0		8.1
WAB fixed-to-variable-rate (2)	May 2020	June 1, 2030	5.25	%	225.0		3.1
Total					$	825.0	$	11.2

December 31, 2021
Description	Issuance Date	Maturity Date	Interest Rate		Principal		Debt Issuance Costs at Origination
					(in millions)
WAL fixed-to-variable-rate (1)	June 2021	June 15, 2031	3.00	%	$	600.0	$	8.1
WAB fixed-to-variable-rate (2)	May 2020	June 1, 2030	5.25	%	225.0		3.1
Total					$	825.0	$	11.2

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

(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 $815.5 million and $815.1 million at March 31, 2022 and December 31, 2021, respectively.

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 as part of 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 $77.8 million and $80.7 million as of March 31, 2022 and December 31, 2021, respectively. The weighted average interest rate of all junior subordinated debt as of March 31, 2022 was 3.30%, which is equal to three-month LIBOR plus the contractual spread of 2.34%, compared to a weighted average interest rate of 2.55% at December 31, 2021. Subsequent to June 30, 2023, interest rates on the Company's junior subordinated debt will be based on SOFR.

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. Stock grants made to non-employee WAL directors in 2022 will be fully vested on July 1, 2022. 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, 2022 and 2021 was $40.0 million and $23.7 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, 2022, the Company recognized $7.1 million in stock-based compensation expense related to these stock grants, compared to $5.6 million for the three months ended March 31, 2021.

In addition, the Company previously granted shares of restricted stock to certain members of executive management that had both performance and service conditions that affect vesting. There were no such grants made during the three months ended March 31, 2022 and 2021, however expense was still being recognized through June 30, 2021 for a grant made in 2017 with a four-year vesting period. The Company recognized $0.3 million in stock-based compensation expense related to these performance-based restricted stock grants during the three months ended March 31, 2021.

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. For the three months ended March 31, 2022, the Company recognized $2.8 million in stock-based compensation expense related to these performance stock units, compared to $2.1 million in stock-based compensation expense for such units during the three months ended March 31, 2021.

The three-year performance period for the 2019 grant ended on December 31, 2021, and the Company's cumulative EPS and TSR performance measure for the performance period exceeded the level required for a maximum award under the terms of the grant. As a result, 203,646 shares became fully vested and distributed to executive management in the first quarter of 2022.

Preferred Stock

On September 15, 2021, the Company entered into an underwriting agreement, pursuant to which the Company agreed to issue and sell an aggregate of 12,000,000 depositary shares, 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).

On February 8, 2022, the Company declared a quarterly cash dividend of $0.27 per depositary share, for a total dividend payment to preferred shareholders of $3.2 million that was paid on March 30, 2022.

Common Stock Issuances

Pursuant to ATM Distribution Agreement

The Company has a distribution agency agreement with J.P. Morgan Securities LLC and Piper Sandler & Co., under which the Company may sell up to 6,132,670 shares of its common stock on the NYSE. The Company pays the distribution agents a mutually agreed rate, not to exceed 2% of the gross offering proceeds of the shares sold pursuant to the distribution agency agreement. The common stock will be sold at prevailing market prices at the time of the sale or at negotiated prices and, as a result, prices will vary. Sales under the ATM program are being 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). During the three months ended March 31, 2022, the Company sold 1.3 million shares under the ATM program at a weighted-average selling price of $86.78 per share for gross proceeds of $108.4 million. Total related offering costs were $0.7 million, substantially all of which relates to compensation costs paid to J.P. Morgan Securities LLC and Piper Sandler & Co. As of March 31, 2022, the remaining number of shares that can be sold under this agreement totaled 1,750,856.

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Registered Direct Offering

The Company sold 2.3 million shares of its common stock in a registered direct offering during the three months ended March 31, 2021. The shares were sold for $91.00 per share for aggregate net proceeds of $209.2 million.

Cash Dividend on Common Shares

During the three months ended March 31, 2022, the Company declared and paid a cash dividend of $0.35, for a total dividend payment to shareholders of $37.3 million. During the three months ended March 31, 2021, the Company declared and paid a cash dividend of $0.25 per share, for a total dividend payment to shareholders of $25.3 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, 2022, the Company purchased treasury shares of 185,534 at a weighted average price of $93.51 per share. During the three months ended March 31, 2021, the Company purchased treasury shares of 154,163 at a weighted average price of $83.56 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 gains (losses) on SERP		Unrealized holding gains (losses) on junior subordinated debt		Total
	(in millions)
Balance, December 31, 2021	$	16.7	$	(0.3)	$	(0.7)	$	15.7
Other comprehensive (loss) income before reclassifications	(247.9)		—		2.2		(245.7)
Amounts reclassified from AOCI	(5.1)		—		—		(5.1)
Net current-period other comprehensive (loss) income	(253.0)		—		2.2		(250.8)
Balance, March 31, 2022	$	(236.3)	$	(0.3)	$	1.5	$	(235.1)
Balance, December 31, 2020	$	92.1	$	(0.3)	$	0.5	$	92.3
Other comprehensive loss before reclassifications	(72.0)		—		(0.3)		(72.3)
Amounts reclassified from AOCI	(0.1)		—		—		(0.1)
Net current-period other comprehensive loss	(72.1)		—		(0.3)		(72.4)
Balance, March 31, 2021	$	20.0	$	(0.3)	$	0.2	$	19.9

11. DERIVATIVES AND HEDGING ACTIVITIES

The Company is a party to various derivative instruments, including those derivative instruments assumed from the AmeriHome acquisition. Derivative instruments are contracts between two or more parties that have a notional amount and an underlying variable, require a small or no initial investment, and allow for the net settlement of positions. A derivative’s notional amount serves as the basis for the payment provision of the contract and takes the form of units, such as shares or dollars. A derivative’s underlying variable is a specified interest rate, security price, commodity price, foreign exchange rate, index, or other variable. The interaction between the notional amount and the underlying variable determines the number of units to be exchanged between the parties and influences the fair value of the derivative contract.

The primary types of derivatives that the Company uses are interest rate swaps, 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 Sheets, 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.

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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 and volatility of net interest income and EVE to interest rate fluctuations. 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 are based on LIBOR and will convert to SOFR upon the discontinuation of LIBOR in June 2023.

The Company also had pay fixed/receive variable interest rate swaps, designated as fair value hedges using the last-of-layer method to manage the exposure to changes in fair value associated with fixed rate loans, resulting from changes in the designated benchmark interest rate (federal funds rate). These last-of-layer hedges provided 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 is 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. During the year ended December 31, 2021, the Company completed a partial discontinuation of one of its last-of-layer hedges, which reduced the total hedged amount on these hedges from $1.0 billion to $880.0 million. During the three months ended March 31, 2022, the Company discontinued the remaining portion of these last-of-layer hedges. The cumulative basis adjustment on the discontinued last-of-layer hedges totaled $30.6 million, which was allocated across the remaining loan pool upon termination of the hedges and is being amortized over the remaining term.

The Company had a receive fixed/pay variable interest rate swap, designated as a fair value hedge on its $175.0 million subordinated debentures issued on June 16, 2016. This swap was terminated during the year ended December 31, 2021 in connection with the full redemption of the debt. The Company was paying a variable rate of three-month LIBOR plus 3.25% and was receiving quarterly fixed payments of 6.25% to match the payments on the debt.

Derivatives Not Designated in Hedge Relationships

Management enters into certain foreign exchange derivative contracts and back-to-back interest rate swaps 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. Contracts with customers, along with the related derivative trades that 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's back-to-back interest rate swaps are used to allow customers to manage long-term interest rate risk.

As it relates to the Company's mortgage banking business, it also uses derivative financial instruments to manage exposure to interest rate risk 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 and interest rate futures.

Fair Value Hedges

As of March 31, 2022 and December 31, 2021, the following amounts are reflected on the Consolidated Balance Sheets related to cumulative basis adjustments for outstanding fair value hedges:

	March 31, 2022				December 31, 2021
	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)	$	474.0	$	20.7	$	1,390.7	$	38.5

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

(2)As of December 31, 2021, included last-of-layer derivative instruments, with $880 million designated as the hedged amount (from a closed portfolio of prepayable fixed rate loans with a carrying value of $1.4 billion). The cumulative basis adjustment included in the carrying value of these hedged items totaled $15.7 million and the basis adjustment related to the discontinued portion was $1.0 million as of December 31, 2021.

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For the Company's derivative instruments that are designated and qualify as a fair value hedge, 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 earnings 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 and for subordinated debt, the gain or loss on the hedged items was included in interest expense, as shown in the table below.

	Three Months Ended March 31,
	2022				2021
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	$	33.5	$	(33.4)	$	38.7	$	(38.7)
Interest expense	—		—		(5.7)		5.7

In addition to the gains and losses on the Company's outstanding fair value hedges presented in the above table, the Company recognized $1.0 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, 2022.

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, 2022, December 31, 2021, and March 31, 2021. The change in the notional amounts of these derivatives from March 31, 2021 to March 31, 2022 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, 2022						December 31, 2021						March 31, 2021
			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 swaps (1)	$	498.5	$	1.7	$	22.7	$	1,382.8	$	13.8	$	54.5	$	1,685.9	$	7.9	$	57.7
Total	498.5		1.7		22.7		1,382.8		13.8		54.5		1,685.9		7.9		57.7
Derivatives not designated as hedging instruments (2):
Foreign currency contracts	$	151.9	$	0.4	$	1.6	$	180.1	$	0.2	$	1.4	$	119.3	$	1.0	$	0.7
Forward purchase contracts	5,018.8		4.1		64.7		11,713.5		8.1		18.0		—		—		—
Forward sales contracts	9,557.0		149.3		6.4		17,358.5		15.8		17.7		—		—		—
Futures purchase contracts (3)	202,818.0		—		—		218,053.7		—		—		—		—		—
Futures sales contracts (3)	219,617.0		—		—		229,040.0		—		—		—		—		—
Interest rate lock commitments	2,419.6		5.8		17.2		3,033.2		11.0		1.6		—		—		—
Interest rate swaps	64.1		0.3		0.3		4.1		0.1		0.1		3.5		0.2		0.2
Total	$	439,646.4	$	159.9	$	90.2	$	479,383.1	$	35.2	$	38.8	$	122.8	$	1.2	$	0.9
Margin			0.1		64.9				1.2		6.5				—		—
Total, including margin	$	439,646.4	$	160.0	$	155.1	$	479,383.1	$	36.4	$	45.3	$	122.8	$	1.2	$	0.9

(1)Interest rate swap amounts include a notional amount of $880 million and $1.0 billion related to the last-of-layer hedges at December 31, 2021 and March 31, 2021, respectively.

(2)Relate to economic hedging arrangements.

(3)The Company enters into forward purchase and sales contracts that are subject to daily remargining and almost all of which, are based on three-month LIBOR to hedge against its MSR valuation exposure. The notional amount on these contracts is substantial as these contracts have a duration of only 0.25 years and are intended to cover the longer duration of MSR hedges.

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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 Sheets, as summarized in the table below:

	March 31, 2022						December 31, 2021						March 31, 2021
	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
Forward purchase contracts	$	3.6	$	—	$	3.6	$	7.9	$	—	$	7.9	$	—	$	—	$	—
Forward sales contracts	148.8		—		148.8		15.5		—		15.5		—		—		—
Interest rate swaps	1.7		—		1.7		13.8		—		13.8		7.9		—		7.9
Margin	0.1		—		0.1		1.2		—		1.2		—		—		—
Netting	—		(130.0)		(130.0)		—		(28.4)		(28.4)		—		—		—
	$	154.2	$	(130.0)	$	24.2	$	38.4	$	(28.4)	$	10.0	$	7.9	$	—	$	7.9
Liabilities
Forward purchase contracts	$	(64.4)	$	—	$	(64.4)	$	(17.7)	$	—	$	(17.7)	$	—	$	—	$	—
Forward sales contracts	(6.2)		—		(6.2)		(17.6)		—		(17.6)		—		—		—
Interest rate swaps	(22.7)		—		(22.7)		(54.5)		—		(54.5)		(57.7)		—		(57.7)
Margin	(64.9)		—		(64.9)		(6.5)		—		(6.5)		—		—		—
Netting	—		130.0		130.0		—		28.4		28.4		—		—		—
	$	(158.2)	$	130.0	$	(28.2)	$	(96.3)	$	28.4	$	(67.9)	$	(57.7)	$	—	$	(57.7)
Derivatives not subject to master netting arrangements:
Assets
Foreign currency contracts	$	0.4	$	—	$	0.4	$	0.2	$	—	$	0.2	$	1.0	$	—	$	1.0
Forward purchase contracts	0.5		—		0.5		0.2		—		0.2		—		—		—
Forward sales contracts	0.5		—		0.5		0.3		—		0.3		—		—		—
Interest rate lock commitments	5.8		—		5.8		11.0		—		11.0		—		—		—
Interest rate swaps	0.3		—		0.3		0.1		—		0.1		0.2		—		0.2
	$	7.5	$	—	$	7.5	$	11.8	$	—	$	11.8	$	1.2	$	—	$	1.2
Liabilities
Foreign currency contracts	$	(1.6)	$	—	$	(1.6)	$	(1.4)	$	—	$	(1.4)	$	(0.7)	$	—	$	(0.7)
Forward purchase contracts	(0.3)		—		(0.3)		(0.3)		—		(0.3)		—		—		—
Forward sales contracts	(0.2)		—		(0.2)		(0.1)		—		(0.1)		—		—		—
Interest rate lock commitments	(17.2)		—		(17.2)		(1.6)		—		(1.6)		—		—		—
Interest rate swaps	(0.3)		—		(0.3)		(0.1)		—		(0.1)		(0.2)		—		(0.2)
	$	(19.6)	$	—	$	(19.6)	$	(3.5)	$	—	$	(3.5)	$	(0.9)	$	—	$	(0.9)
Total derivatives and margin
Assets	$	161.7	$	(130.0)	$	31.7	$	50.2	$	(28.4)	$	21.8	$	9.1	$	—	$	9.1
Liabilities	$	(177.8)	$	130.0	$	(47.8)	$	(99.8)	$	28.4	$	(71.4)	$	(58.6)	$	—	$	(58.6)

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

	Three Months Ended March 31, 2022
	($ in millions)
Net gain (loss) on loan origination and sale activities:
Interest rate lock commitments	$	(20.8)
Forward contracts	241.3
Other contracts	(3.7)
Total gain	$	216.8
Net loan servicing revenue:
Forward contracts	$	(34.9)
Options contracts	—
Futures contracts	(22.0)
Total loss	$	(56.9)

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, such as GNMA, FNMA, and FHLMC. The total collateral pledged by the Company to counterparties for its derivatives designated as hedging instruments totaled $45.0 million, $67.1 million, and $93.2 million as of March 31, 2022, December 31, 2021, and March 31, 2021, respectively.

12. EARNINGS PER SHARE

Diluted EPS is based on the weighted average outstanding common shares during the period, including common stock equivalents. Basic EPS is based on 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,
	2022		2021
	(in millions, except per share amounts)
Weighted average shares - basic	106.0		100.8
Dilutive effect of stock awards	0.6		0.6
Weighted average shares - diluted	106.6		101.4
Net income available to common stockholders	$	236.9	$	192.5
Earnings per share - basic	2.23		1.91
Earnings per share - diluted	2.22		1.90

The Company had no anti-dilutive stock options outstanding as of March 31, 2022 and 2021.

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13. INCOME TAXES

The Company's effective tax rate was 19.5% and 17.9% for the three months ended March 31, 2022 and 2021, respectively. The increase in the effective tax rate was primarily due to projected pretax book income growth outpacing growth in permanent tax benefit items for the year and an increase in state tax expense.

As of March 31, 2022, the net DTA balance totaled $67.6 million, an increase of $46.7 million from $20.9 million at December 31, 2021. This overall increase in the net DTA was primarily the result of decreases in the fair market value of AFS securities, which were not fully offset by increases to MSRs.

Although realization is not assured, the Company believes that the realization of the recognized deferred tax asset of $67.6 million at March 31, 2022 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, 2022 and December 31, 2021, 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. The limited liability entities are considered to be VIEs; however, as a limited partner, the Company is not the primary beneficiary and is not required to consolidate these entities.

Investments in LIHTC and renewable energy totaled $729.9 million and $631.3 million as of March 31, 2022 and December 31, 2021, respectively. Unfunded LIHTC and renewable energy obligations are included as part of Other liabilities on the Consolidated Balance Sheets and totaled $445.9 million and $360.8 million as of March 31, 2022 and December 31, 2021, respectively. For the three months ended March 31, 2022 and 2021, $13.4 million and $15.5 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 Sheets.

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, 2022		December 31, 2021
	(in millions)
Commitments to extend credit, including unsecured loan commitments of $1,205.2 at March 31, 2022 and $1,199.8 at December 31, 2021	$	14,884.8	$	13,396.3
Credit card commitments and financial guarantees	319.2		306.3
Letters of credit, including unsecured letters of credit of $2.6 at March 31, 2022 and $12.9 at December 31, 2021	201.8		198.1
Total	$	15,405.8	$	13,900.7

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

54

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 allowance for credit losses reported in "Note 5. Loans, Leases and Allowance for Credit Losses" of these Unaudited Consolidated Financial Statements. This loss contingency for unfunded loan commitments and letters of credit was $43.3 million and $37.6 million as of March 31, 2022 and December 31, 2021, respectively. Changes to this liability are adjusted through the provision for credit losses in the Consolidated Income Statement.

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. The Company's loan portfolio includes significant credit exposure to the CRE market. As of March 31, 2022 and December 31, 2021, CRE related loans accounted for approximately 29% of total loans. Substantially all of these loans are secured by first liens with an initial loan-to-value ratio of generally not more than 75%. Approximately 21% and 23% of these CRE loans, excluding construction and land loans, were owner-occupied as of March 31, 2022 and as of December 31, 2021, respectively.

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, other offices, and data facility centers. Operating lease costs totaled $5.9 million during the three months ended March 31, 2022, compared to $3.7 million for the three months ended March 31, 2021. Other lease costs, which include common area maintenance, parking, and taxes, and were included as part of occupancy expense, totaled $1.1 million during the three months ended March 31, 2022, compared to $1.0 million for the three months ended March 31, 2021.

15. FAIR VALUE ACCOUNTING

The fair value of an asset or liability is the price that would be received to sell that asset or paid to transfer that 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 that 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). The three levels of the fair value hierarchy under ASC 825 are described in "Note 1. Summary of Significant Accounting Policies" of these Notes to Unaudited Consolidated Financial Statements.

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 that 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. Furthermore, the reported fair value amounts have not been comprehensively revalued since the presentation dates, and therefore, estimates of fair value after the balance sheet date may

55

differ significantly from the amounts presented herein. 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 as part of OCI rather than earnings. The Company did not elect FVO treatment for the junior subordinated debt assumed in the Bridge Capital Holdings acquisition.

For the three months ended March 31, 2022 and 2021, unrealized gains and losses from fair value changes on junior subordinated debt were as follows:

	Three Months Ended March 31,
	2022		2021
	(in millions)
Unrealized losses (gains)	$	2.9	$	(0.4)
Changes included in OCI, net of tax	2.2		(0.3)

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 primarily 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 loans HFS are salable into active markets. Accordingly, the fair value of these loans is based on quoted market or contracted selling prices or a market price equivalent, which are categorized as Level 2 in the fair value hierarchy.

The fair value of EBO loans, non-agency loans, and loans that are delinquent or have an underwriting defect are valued using Level 3 inputs since they lack active markets.

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 that 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: Treasury futures and options, Eurodollar futures, and swap futures are measured based on valuation techniques using Level 1 inputs from exchange-provided daily settlement quotes. Forward purchase and sales contracts are measured based on valuation techniques using Level 2 inputs, such as quoted market price, contracted selling price, or market price equivalent. Interest rate swaps are reported at fair value utilizing Level 2 inputs. The Company obtains dealer quotations to value its interest rate swaps. 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

56

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 the pull-through rate. The pull-through rate and servicing fee multiple are unobservable inputs based on historical experience.

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 that 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 as of the periods presented: 

	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
	(in millions)
March 31, 2022
Assets:
Available-for-sale debt securities
CLO	$	—	$	2,055.3	$	—	$	2,055.3
Commercial MBS issued by GSEs	—		62.2		—		62.2
Corporate debt securities	—		415.3		—		415.3
Private label residential MBS	—		1,343.2		—		1,343.2
Residential MBS issued by GSEs	—		1,905.0		—		1,905.0
Tax-exempt	—		992.9		—		992.9
Other	27.4		50.9		—		78.3
Total AFS debt securities	$	27.4	$	6,824.8	$	—	$	6,852.2
Equity securities
CRA investments	$	26.2	$	26.1	$	—	$	52.3
Preferred stock	112.4		—		—		112.4
Total equity securities	$	138.6	$	26.1	$	—	$	164.7
Loans HFS	$	—	$	2,940.5	$	7.9	$	2,948.4
Mortgage servicing rights	—		—		950.3		950.3
Derivative assets (1)	—		155.9		5.8		161.7
Liabilities:
Junior subordinated debt (2)	$	—	$	—	$	64.5	$	64.5
Derivative liabilities (1)	—		160.6		17.2		177.8

(1)See "Note 11. Derivatives and Hedging Activities." In addition, the carrying value of loans is increased by $20.7 million as of March 31, 2022 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.

(2)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.

57

	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
	(in millions)
December 31, 2021
Assets:
Available-for-sale debt securities
CLO	$	—	$	926.2	$	—	$	926.2
Commercial MBS issued by GSEs	—		68.5		—		68.5
Corporate debt securities	—		382.9		—		382.9
Private label residential MBS	—		1,508.0		—		1,508.0
Residential MBS issued by GSEs	—		1,993.4		—		1,993.4
Tax-exempt	—		1,215.1		—		1,215.1
U.S. treasury securities	13.0		—		—		13.0
Other	27.4		54.3		—		81.7
Total AFS debt securities	$	40.4	$	6,148.4	$	—	$	6,188.8
Equity securities
CRA investments	$	27.4	$	17.2	$	—	$	44.6
Preferred stock	113.9		—		—		113.9
Total equity securities	$	141.3	$	17.2	$	—	$	158.5
Loans - HFS	$	—	$	3,894.2	$	45.5	$	3,939.7
Mortgage servicing rights	—		—		698.0		698.0
Derivative assets (1)	—		39.2		11.0		50.2
Liabilities:
Junior subordinated debt (2)	$	—	$	—	$	67.4	$	67.4
Derivative liabilities (1)	—		98.2		1.6		99.8

(1)See "Note 11. Derivatives and Hedging Activities." In addition, the carrying value of loans is increased by $38.5 million as of December 31, 2021 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.

(2)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.

For the three months ended March 31, 2022 and 2021, 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,
	2022		2021
	(in millions)
Beginning balance	$	(67.4)	$	(65.9)
Change in fair value (1)	2.9		(0.4)
Ending balance	$	(64.5)	$	(66.3)

(1)Unrealized gains/(losses) attributable to changes in the fair value of junior subordinated debt are recorded as part of OCI, net of tax, and totaled $2.2 million and $(0.3) million for three months ended March 31, 2022 and 2021, respectively.

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

	March 31, 2022		Valuation Technique	Significant Unobservable Inputs	Input Value
	(in millions)
Junior subordinated debt	$	64.5	Discounted cash flow	Implied credit rating of the Company	3.80	%

	December 31, 2021		Valuation Technique	Significant Unobservable Inputs	Input Value
	(in millions)
Junior subordinated debt	$	67.4	Discounted cash flow	Implied credit rating of the Company	2.61	%

The significant unobservable inputs used in the fair value measurement of the Company’s junior subordinated debt as of March 31, 2022 and December 31, 2021 was the implied credit risk for the Company. As of March 31, 2022 and December 31, 2021,

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

As of March 31, 2022, the Company estimates the discount rate at 3.80%, which represents an implied credit spread of 2.84% plus three-month LIBOR (0.96%). As of December 31, 2021, the Company estimated the discount rate at 2.61%, which was a 2.40% credit spread plus three-month LIBOR (0.21%).

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, 2022
	Loans held for sale		Mortgage servicing rights		Net interest rate lock commitments (1)
	(in millions)
Balance, December 31, 2021	$	45.5	$	698.0	$	9.4
Purchases and additions	292.2		204.1		5,323.3
Sales and payments	(350.7)		—		—
Transfers from Level 2 to Level 3	38.5		—		—
Transfers from Level 3 to Level 2	(17.6)		—		—
Settlement of interest rate lock commitments upon acquisition or origination of loans HFS	—		—		(5,321.1)
Change in fair value	—		81.4		(23.0)
Realization of cash flows	—		(33.2)		—
Balance, March 31, 2022	$	7.9	$	950.3	$	(11.4)
Unrealized (losses) gains included in income related to assets held at period end	$	—	$	80.4	$	(11.4)

(1)     Interest rate lock commitment asset and liability positions are presented net.

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

		March 31, 2022
Asset/liability	Key inputs	Range	Weighted average
Mortgage servicing rights:	Option adjusted spread (in basis points)	408 - 623	518
	Conditional prepayment rate (1)	8.9% - 17.2%	13.0%
	Recapture rate	20.0% - 20.0%	20.0%
	Servicing fee rate (in basis points)	25.0 - 50.0	30.1
	Cost to service	$84 - $91	$86
Loans held for sale:	Whole loan spread to TBA price (in basis points)	(4.2) - (2.0)	(3.1)
Interest rate lock commitments:	Servicing fee multiple	3.6 - 5.6	4.7
	Pull-through rate	73% - 100%	89%

		December 31, 2021
Asset/liability	Key inputs	Range	Weighted average
Mortgage servicing rights:	Option adjusted spread (in basis points)	553 - 735	600
	Conditional prepayment rate (1)	9.9% - 20.7%	15.2
	Recapture rate	20.0% - 20.0%	20
	Servicing fee rate (in basis points)	25.0 - 50.0	29.5
	Cost to service	$84 - $91	86
Loans held for sale:	Whole loan spread to TBA price (in basis points)	(3.7) - (2.9)	(3.3)
Interest rate lock commitments:	Servicing fee multiple	3.6 - 5.4	4.6
	Pull-through rate	75% - 100%	90

(1)    Lifetime total prepayment speed annualized.

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

	March 31, 2022						December 31, 2021
	Fair value		Unpaid principal balance		Difference		Fair value		Unpaid principal balance		Difference
	(in millions)
Loans held for sale:
Current through 89 days delinquent	$	2,946.4	$	2,936.9	$	9.5	$	3,937.5	$	3,807.3	$	130.2
90 days or more delinquent	2.0		2.1		(0.1)		2.2		2.2		—
Total	$	2,948.4	$	2,939.0	$	9.4	$	3,939.7	$	3,809.5	$	130.2

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, 2022:
Loans HFI	$	259.6	$	—	$	—	$	259.6
Other assets acquired through foreclosure	11.7		—		—		11.7
As of December 31, 2021:
Loans HFI	$	216.0	$	—	$	—	$	216.0
Other assets acquired through foreclosure	11.7		—		—		11.7

For Level 3 assets measured at fair value on a nonrecurring basis as of March 31, 2022 and December 31, 2021, the significant unobservable inputs used in the fair value measurements were as follows:

	March 31, 2022		Valuation Technique(s)		Significant Unobservable Inputs	Range
	(in millions)
Loans HFI	$	259.6	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 6.0%
				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	11.7		Collateral method	Third party appraisal	Costs to sell	4.0% to 10.0%

	December 31, 2021		Valuation Technique(s)		Significant Unobservable Inputs	Range
	(in millions)
Loans HFI	$	216.0	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 6.0%
				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	11.7		Collateral method	Third party appraisal	Costs to sell	4.0% to 10.0%

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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 $259.6 million and $216.0 million at March 31, 2022 and December 31, 2021, respectively, net of a specific allowance for credit losses of $7.0 million and $10.8 million at March 31, 2022 and December 31, 2021, 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 twelve 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 $11.7 million of such assets at March 31, 2022 and December 31, 2021.

Fair Value of Financial Instruments

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

	March 31, 2022
	Carrying Amount		Fair Value
			Level 1		Level 2		Level 3		Total
	(in millions)
Financial assets:
Investment securities:
HTM	$	1,161.0	$	—	$	1,139.9	$	—	$	1,139.9
AFS	6,852.2		27.4		6,824.8		—		6,852.2
Equity	164.7		138.6		26.1		—		164.7
Derivative assets	161.7		—		155.9		5.8		161.7
Loans HFS	4,761.6		—		2,940.5		1,828.3		4,768.8
Loans HFI, net	40,861.5		—		—		41,030.6		41,030.6
Mortgage servicing rights	950.3		—		—		950.3		950.3
Accrued interest receivable	235.6		—		235.6		—		235.6
Financial liabilities:
Deposits	$	52,159.5	$	—	$	52,162.7	$	—	$	52,162.7
Other borrowings	833.3		—		798.2		—		798.2
Qualifying debt	893.3		—		808.7		77.8		886.5
Derivative liabilities	177.8		—		160.6		17.2		177.8
Accrued interest payable	13.5		—		13.5		—		13.5

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	December 31, 2021
	Carrying Amount		Fair Value
			Level 1		Level 2		Level 3		Total
	(in millions)
Financial assets:
Investment securities:
HTM	$	1,107.1	$	—	$	1,146.4	$	—	$	1,146.4
AFS	6,188.8		40.4		6,148.4		—		6,188.8
Equity securities	158.5		141.3		17.2		—		158.5
Derivative assets	50.2		—		39.2		11.0		50.2
Loans HFS	5,635.1		—		3,894.2		1,760.2		5,654.4
Loans HFI, net	38,822.9		—		—		39,218.2		39,218.2
Mortgage servicing rights	698.0		—		—		698.0		698.0
Accrued interest receivable	227.9		—		227.9		—		227.9
Financial liabilities:
Deposits	$	47,612.0	$	—	$	47,615.5	$	—	$	47,615.5
Other borrowings	1,501.9		—		1,518.4		—		1,518.4
Qualifying debt	895.8		—		857.3		81.3		938.6
Derivative liabilities	99.8		—		98.2		1.6		99.8
Accrued interest payable	9.2		—		9.2		—		9.2

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 that does not conform to both management and BOD risk tolerances without ALCO approval. There is also ALCO reporting at the Parent level for reviewing interest rate risk for the Company, which gets 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, 2022 and December 31, 2021 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, 2022 and December 31, 2021.

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

•Corporate & Other segment: consists of the Company's investment portfolio, Corporate borrowings and other related items, income and expense items not allocated to our 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 year. 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 that 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 life of the assets or liabilities in the portfolio. Residual funds transfer pricing mismatches are allocable to the Corporate & Other segment and presented as part of 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 the effective tax rate for the geographic location of the segment. 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, 2022:	(in millions)
Assets:
Cash, cash equivalents, and investment securities	$	10,878.9	$	15.6	$	97.0	$	10,766.3
Loans held for sale	4,761.6		—		4,761.6		—
Loans, net of deferred fees and costs	41,119.1		25,794.8		15,324.3		—
Less: allowance for credit losses	(257.6)		(221.3)		(36.3)		—
Total loans	40,861.5		25,573.5		15,288.0		—
Other assets acquired through foreclosure, net	11.7		11.7		—		—
Goodwill and other intangible assets, net	698.2		294.3		403.9		—
Other assets	3,364.2		253.2		1,594.8		1,516.2
Total assets	$	60,576.1	$	26,148.3	$	22,145.3	$	12,282.5
Liabilities:
Deposits	$	52,159.5	$	30,133.6	$	18,527.6	$	3,498.3
Borrowings and qualifying debt	1,726.6		18.0		369.8		1,338.8
Other liabilities	1,678.4		268.1		170.3		1,240.0
Total liabilities	55,564.5		30,419.7		19,067.7		6,077.1
Allocated equity:	5,011.6		2,661.8		1,752.1		597.7
Total liabilities and stockholders' equity	$	60,576.1	$	33,081.5	$	20,819.8	$	6,674.8
Excess funds provided (used)	—		6,933.2		(1,325.5)		(5,607.7)
Income Statement:
Three Months Ended March 31, 2022:	(in millions)
Net interest income	$	449.5	$	334.9	$	183.2	$	(68.6)
Provision for (recovery of) credit losses	9.0		0.6		10.5		(2.1)
Net interest income (expense) after provision for credit losses	440.5		334.3		172.7		(66.5)
Non-interest income	106.3		16.9		79.2		10.2
Non-interest expense	248.6		114.4		125.0		9.2
Income (loss) before income taxes	298.2		236.8		126.9		(65.5)
Income tax expense (benefit)	58.1		56.2		30.4		(28.5)
Net income (loss)	$	240.1	$	180.6	$	96.5	$	(37.0)

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Balance Sheet:	Consolidated Company		Commercial		Consumer Related		Corporate
At December 31, 2021:	(in millions)
Assets:
Cash, cash equivalents, and investment securities	$	8,057.3	$	12.9	$	82.4	$	7,962.0
Loans held for sale	5,635.1		—		5,635.1		—
Loans, net of deferred fees and costs	39,075.4		25,092.4		13,983.0		—
Less: allowance for credit losses	(252.5)		(226.0)		(26.5)		—
Total loans	38,822.9		24,866.4		13,956.5		—
Other assets acquired through foreclosure, net	11.7		11.7		—		—
Goodwill and other intangible assets, net	634.8		294.7		340.1		—
Other assets	2,820.8		253.8		1,278.1		1,288.9
Total assets	$	55,982.6	$	25,439.5	$	21,292.2	$	9,250.9
Liabilities:
Deposits	$	47,612.0	$	30,466.8	$	15,362.9	$	1,782.3
Borrowings and qualifying debt	2,381.1		—		353.2		2,027.9
Other liabilities	1,026.9		233.4		138.2		655.3
Total liabilities	51,020.0		30,700.2		15,854.3		4,465.5
Allocated equity:	4,962.6		2,588.0		1,596.2		778.4
Total liabilities and stockholders' equity	$	55,982.6	$	33,288.2	$	17,450.5	$	5,243.9
Excess funds provided (used)	—		7,848.7		(3,841.7)		(4,007.0)
Income Statements:
Three Months Ended March 31, 2021:	(in millions)
Net interest income	$	317.3	$	263.7	$	107.9	$	(54.3)
Provision for (recovery of) credit losses	(32.4)		(36.3)		1.7		2.2
Net interest income (expense) after provision for credit losses	349.7		300.0		106.2		(56.5)
Non-interest income	19.7		19.2		0.5		—
Non-interest expense	135.0		98.3		35.2		1.5
Income (loss) before income taxes	234.4		220.9		71.5		(58.0)
Income tax expense (benefit)	41.9		52.7		17.5		(28.3)
Net income (loss)	$	192.5	$	168.2	$	54.0	$	(29.7)

17. REVENUE FROM CONTRACTS WITH CUSTOMERS

ASC 606, Revenue from Contracts with Customers, requires revenue to be recognized at an amount that reflects the consideration to which the entity expects to be entitled in exchange for transferring goods or services to a customer. The majority of the Company’s revenue streams are outside the scope of ASC 606. Revenue streams including service charges and fees, interchange fees on credit and debit cards, success fees, and legal settlement service fees are within the scope of ASC 606.

Performance Obligations

Many of the services the Company performs for its customers are ongoing, and either party may cancel at any time. The fees for these contracts are dependent upon various underlying factors, such as customer deposit balances, and as such may be considered variable. The Company’s performance obligations for these services are satisfied as the services are rendered and payment is collected on a monthly, quarterly, or semi-annual basis. For services provided at a point in time, fees are recognized at the time such services are rendered. The Company had no material unsatisfied performance obligations as of March 31, 2022 or 2021.

Service Charges and Fees

The Company performs deposit account services for its customers, which include analysis and treasury management services, use of safe deposit boxes, check upcharges, and other ancillary services. The depository arrangements the Company holds with its customers are considered day-to-day contracts with ongoing renewals and optional purchases, and as such, the contract duration does not extend beyond the services performed. Due to the short-term nature of such contracts, the Company generally recognizes revenue for deposit related fees as services are rendered. From time to time, the Company may waive certain fees for its customers. The Company considers historical experience when recognizing revenue from contracts with customers, and may reduce the transaction price to account for fee waivers or refunds.

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Debit and Credit Card Interchange

When a credit or debit card issued by the Company is used to purchase goods or services from a merchant, the Company earns an interchange fee. Interchange fees on credit and debit cards are included as part of Commercial banking related income in the Consolidated Income Statements. The Company considers the merchant to be its customer in these transactions as nightly settlement services between the payment network and the merchant are being provided to the merchant. This transmission of data and funds represents the Company’s performance obligation and is performed nightly. As the payment network is in direct control of setting the rates, the Company acts as an agent. Interchange fees are recorded net of expenses as the services are provided.

Success Fees

Success fees are one-time fees detailed as part of certain loan agreements and are earned upon occurrence of a triggering event. Examples of triggering events include: a borrower obtaining its next round of funding, an acquisition, or completion of a public offering. Success fees are variable as the transaction price can vary and is contingent on the occurrence or non-occurrence of a triggering event. These fees are included as part of Income from equity investments in the Consolidated Income Statements.

Legal Settlement Services

The Company provides payment services for claim administrators responsible for distributing funds from legal settlements, such as class action lawsuits. Claimants access the Company's platform, select their preferred method of payment, and funds are transferred to the claimant. Upon the transfer of funds, the Company is entitled to a fee paid by the claim administrator. Revenue is recognized upon each transfer of funds to a claimant.

Revenues within the scope of ASC 606 totaled $14.4 million and $9.2 million for the three months ended March 31, 2022, and 2021, respectively.

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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, 2021 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, 2022 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 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) the potential adverse effects of the ongoing COVID-19 pandemic and any governmental or societal responses thereto; 2) other adverse financial market and economic conditions, including the potential impact on borrowers of supply chain disruptions and the economic and market impacts of the military conflict between Russia and Ukraine; 3) changes in interest rates and increased rate competition; 4) exposure of financial instruments to certain market risks that may increase the volatility of earnings and AOCI; 5) the inherent risk associated with accounting estimates, including the impact to the Company's allowance, provision for credit losses, and capital levels under the CECL accounting standard; 6) exposure to natural and man-made disasters in markets that the Company operates and the impact of climate change on the Company and its customers; 7) dependency on real estate and events that negatively impact the real estate market; 8) high concentration of commercial real estate, residential mortgage, and commercial and industrial loans; 9) residual risk retained by the Company on reference pools covered by credit linked notes; 10) exposure to environmental liabilities related to the properties to which the Company acquires title; 11) the Company's ability to compete in a highly competitive market; 12) expansion strategies that may not be successful; 13) uncertainty associated with digital payment initiatives; 14) the Company's ability to recruit and retain qualified employees and implement adequate succession planning to mitigate the loss of key members of its senior management team; 15) dependence on low-cost deposits; 16) risks related to representations and warranties made on third-party loan sales; 17) ability to borrow from the FHLB or the FRB; 18) a change in the Company's creditworthiness; 19) information security breaches; 20) reliance on third parties to provide key components of the Company's infrastructure; 21) perpetration of fraud; 22) the Company's ability to implement and improve its controls and processes to keep pace with its growth; 23) the replacement of LIBOR; 24) the Company's ability to adapt to technological change; 25) risk of operating in a highly regulated industry and the Company's ability to remain in compliance; 26) failure to comply with state and federal banking agency laws and regulations; 27) results of any tax audit findings, challenges to the Company's tax positions, or adverse changes or interpretations of tax laws; 28) potential negative publicity and reputational harm from certain allegations with respect to the Phoenix Suns and Robert Sarver; and 29) risks related to ownership and price of the Company's common stock.

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 Item 1A of the Company's Annual Report on Form 10-K for the year ended December 31, 2021. 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 Developments: Acquisition of Digital Disbursements

On January 25, 2022, the Company completed its acquisition of Digital Settlement Technologies LLC, doing business as Digital Disbursements, a digital payments platform for the class action legal industry. DST's proprietary platform enables claimants to select their payment method, including direct-to-bank account options and popular digital wallets. This provides the Company with the internal capability to significantly increase efficacy, reduce distribution costs and improve potential fraud detection for the legal class action market. The acquisition is expected to grow the Company's deposit base and continue to extend the suite of legal banking services offered while serving adjacent sectors that will benefit from digital payments technology.

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 blockchain-based 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 has added to its capabilities with the acquisition of DST on January 25, 2022, which provides digital payment services for the class action legal industry.

Financial Results Highlights for the First Quarter of 2022

•Net income available to common stockholders of $236.9 million, compared to $192.5 million for the first quarter 2021

•Diluted earnings per share of $2.22, compared to $1.90 per share for the first quarter 2021

•Net revenue of $555.8 million, an increase of 64.9%, or $218.8 million, compared to the first quarter 2021, with non-interest expense increase of 84.1%, or $113.6 million, compared to the first quarter 2021

•PPNR of $307.2 million, up 52.1% from $202.0 million in the first quarter 20211

•Total HFI loans of $41.1 billion, up $2.0 billion from December 31, 2021

•Total deposits of $52.2 billion, up $4.5 billion from December 31, 2021

•Stockholders' equity of $5.0 billion, an increase of $49.0 million from December 31, 2021

•Nonperforming assets (nonaccrual loans and repossessed assets) decreased to 0.17% of total assets, from 0.27% at March 31, 2021

•Annualized net loan charge-offs to average loans outstanding of approximately 0.00%, compared to 0.02% for the first quarter 2021

•Net interest margin of 3.32%, compared to 3.37% in the first quarter 2021

•Tangible common equity ratio of 6.7%, compared to 7.9% at March 31, 20211

•Book value per common share of $43.56, an increase of 21.4% from $35.89 at March 31, 2021

•Tangible book value per share, net of tax, of $37.13, an increase of $4.11, or 12.4%, from $33.02 at March 31, 20211

•Efficiency ratio of 44.1% in the first quarter 2022, compared to 39.1% in the first quarter 20211

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, 2022.

1 See Non-GAAP Financial Measures section beginning on page 71.

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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,
	2022			2021
	(in millions, except per share amounts)
Net income	$	240.1		$	192.5
Net income available to common stockholders	236.9			192.5
Earnings per share - basic	2.23			1.91
Earnings per share - diluted	2.22			1.90
Return on average assets	1.64		%	1.93		%
Return on average equity	19.5			22.1
Return on average tangible common equity (1)	23.9			24.2
Net interest margin	3.32			3.37

(1) See Non-GAAP Financial Measures section beginning on page 71.

	March 31, 2022		December 31, 2021
	(in millions)
Total assets	$	60,576.1	$	55,982.6
Loans HFS	4,761.6		5,635.1
Loans HFI, net of deferred loan fees and costs	41,119.1		39,075.4
Total deposits	52,159.5		47,612.0
Other borrowings	833.3		1,501.9
Qualifying debt	893.3		895.8
Stockholders' equity	5,011.6		4,962.6
Tangible common equity, net of tax (1)	4,020.9		4,035.2

(1) See Non-GAAP Financial Measures section beginning on page 71.

Asset Quality

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 HFI loans: 

	March 31, 2022			December 31, 2021
	(dollars in millions)
Nonaccrual loans	$	91.0		$	72.6
Repossessed assets	11.7			11.7
Non-performing assets	105.6			87.3
Nonaccrual loans to funded loans	0.22		%	0.19		%
Nonaccrual and repossessed assets to total assets	0.17			0.15
Allowance for loan losses to funded loans	0.63			0.65
Allowance for credit losses to funded loans	0.73			0.74
Net charge-offs to average loans outstanding (1)	0.00			0.02

(1)Annualized on an actual/actual basis for the three months ended March 31, 2022. Actual year-to-date for the year ended December 31, 2021.

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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 $60.6 billion at March 31, 2022 from $56.0 billion at December 31, 2021. The increase in total assets of $4.6 billion, or 8.2%, was driven by continued organic loan and deposit growth, which contributed to an increase in cash of $2.1 billion as well as an increase in investment securities of $725.5 million. HFI loans increased by $2.0 billion, or 5.2%, to $41.1 billion as of March 31, 2022, compared to $39.1 billion as of December 31, 2021. The increase in HFI loans from December 31, 2021 was driven by increases in residential real estate loans of $2.0 billion, CRE, non-owner occupied loans of $323.2 million, and construction and land development loans of $255.0 million. These increases were partially offset by decreases in commercial and industrial loans of $435.6 million and CRE, owner occupied loans of $92.7 million. In addition, HFS loans decreased by $873.5 million, from $5.6 billion as of December 31, 2021.

Total deposits increased $4.5 billion, or 9.6%, to $52.2 billion as of March 31, 2022 from $47.6 billion as of December 31, 2021. The increase in deposits from December 31, 2021 was driven by increases of $2.2 billion in non-interest bearing demand deposits, $1.3 billion in interest bearing demand deposits, and $1.3 billion in savings and money market accounts. These increases were partially offset by a decrease in certificates of deposit of $237.7 million.

RESULTS OF OPERATIONS

The following table sets forth a summary financial overview for the comparable periods:

	Three Months Ended March 31,				Increase
	2022		2021		(Decrease)
	(in millions, except per share amounts)
Consolidated Income Statement Data:
Interest income	$	484.5	$	334.1	$	150.4
Interest expense	35.0		16.8		18.2
Net interest income	449.5		317.3		132.2
Provision for (recovery of) credit losses	9.0		(32.4)		41.4
Net interest income after provision for (recovery of) credit losses	440.5		349.7		90.8
Non-interest income	106.3		19.7		86.6
Non-interest expense	248.6		135.0		113.6
Income before provision for income taxes	298.2		234.4		63.8
Income tax expense	58.1		41.9		16.2
Net income	240.1		192.5		47.6
Dividends on preferred stock	3.2		—		3.2
Net income available to common stockholders	$	236.9	$	192.5	$	44.4
Earnings per share:
Basic	$	2.23	$	1.91	$	0.32
Diluted	2.22		1.90		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 of PPNR for the three months ended March 31, 2022 and 2021:

	Three Months Ended March 31,
	2022		2021
	(in millions)
Net interest income	$	449.5	$	317.3
Total non-interest income	106.3		19.7
Net revenue	$	555.8	$	337.0
Total non-interest expense	248.6		135.0
Pre-provision net revenue	$	307.2	$	202.0
Less:
Provision for (recovery of) credit losses	9.0		(32.4)
Income tax expense	58.1		41.9
Net income	$	240.1	$	192.5

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,
	2022			2021
	(dollars in millions)
Total non-interest expense	$	248.6		$	135.0
Divided by:
Total net interest income	$	449.5		$	317.3
Plus:
Tax equivalent interest adjustment	8.0			8.0
Total non-interest income	106.3			19.7
	$	563.8		$	345.0
Efficiency ratio - tax equivalent basis	44.1		%	39.1		%

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Tangible Common Equity

The following table presents financial measures related to tangible common equity. Tangible common equity represents total stockholders' equity, less identifiable intangible assets and goodwill. 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. In addition, management believes that these measures improve comparability to other institutions that have not engaged in acquisitions that resulted in recorded goodwill and other intangible assets.

	March 31, 2022			December 31, 2021
	(dollars and shares in millions)
Total stockholders' equity	$	5,011.6		$	4,962.6
Less:
Goodwill and intangible assets	698.2			634.8
Preferred stock	294.5			294.5
Total tangible common stockholders' equity	4,018.9			4,033.3
Plus: deferred tax - attributed to intangible assets	2.0			1.9
Total tangible common equity, net of tax	$	4,020.9		$	4,035.2
Total assets	$	60,576.1		$	55,982.6
Less: goodwill and intangible assets, net	698.2			634.8
Tangible assets	59,877.9			55,347.8
Plus: deferred tax - attributed to intangible assets	2.0			1.9
Total tangible assets, net of tax	$	59,879.9		$	55,349.7
Tangible common equity ratio	6.7		%	7.3		%
Common shares outstanding	108.3			106.6
Book value per common share	$	43.56		$	43.78
Tangible book value per common share, net of tax	37.13			37.84

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Regulatory Capital

The following table presents certain financial measures related to regulatory capital under Basel III, which includes common equity tier 1 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 to delay the estimated impact of CECL on its regulatory capital over a five-year transition period ending December 31, 2024. Beginning as of March 31, 2022, capital ratios and amounts include a 25% reduction to the capital benefit that resulted from the increased allowance for credit losses related to the adoption of ASC 326.

	March 31, 2022			December 31, 2021
	(dollars in millions)
Common equity tier 1:
Common equity	$	4,752.6		$	4,715.4
Less:
Non-qualifying goodwill and intangibles	694.0			631.3
Disallowed deferred tax asset	1.8			—
AOCI related adjustments	(236.6)			16.4
Unrealized gain on changes in fair value liabilities	1.5			(0.7)
Common equity tier 1	$	4,291.9		$	4,068.4
Divided by: Risk-weighted assets	$	47,772.1		$	44,697.0
Common equity tier 1 ratio	9.0		%	9.1		%
Common equity tier 1	$	4,291.9		$	4,068.4
Plus: Preferred stock and trust preferred securities	376.0			375.9
Tier 1 capital	$	4,667.9		$	4,444.3
Divided by: Tangible average assets	$	58,687.4		$	56,972.9
Tier 1 leverage ratio	8.0		%	7.8		%
Total capital:
Tier 1 capital	$	4,667.9		$	4,444.3
Plus:
Subordinated debt	815.5			815.1
Adjusted allowances for credit losses	262.3			239.6
Tier 2 capital	$	1,077.8		$	1,054.7
Total capital	$	5,745.7		$	5,499.0
Total capital ratio	12.0		%	12.3		%
Classified assets to tier 1 capital plus allowance:
Classified assets	$	365.1		$	300.7
Divided by: Tier 1 capital	4,667.9			4,444.3
Plus: Adjusted allowances for credit losses	262.3			239.6
Total Tier 1 capital plus adjusted allowances for credit losses	$	4,930.2		$	4,683.9
Classified assets to tier 1 capital plus allowance	7.4		%	6.4		%

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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,
	2022						2021
	Average Balance		Interest		Average Yield / Cost		Average Balance		Interest		Average Yield / Cost
	(dollars in millions)
Interest earning assets
Loans held for sale	$	6,521.5	$	50.4	3.14	%	$	—	$	—	—	%
Loans held for investment:
Commercial and industrial	17,487.0		165.9		3.91		13,951.6		151.0		4.48
CRE - non-owner-occupied	6,689.6		73.2		4.44		5,649.7		65.1		4.68
CRE - owner-occupied	1,859.1		22.8		5.07		2,094.2		24.4		4.83
Construction and land development	3,090.0		41.7		5.47		2,484.8		35.6		5.81
Residential real estate	10,384.6		80.2		3.13		2,507.7		21.9		3.55
Consumer	51.6		0.5		3.95		34.5		0.4		5.39
Total HFI loans (1), (2), (3)	39,561.9		384.3		3.98		26,722.5		298.4		4.59
Securities:
Securities - taxable	5,534.0		29.9		2.19		4,531.4		18.5		1.66
Securities - tax-exempt	2,136.2		18.1		4.29		1,980.9		15.5		3.99
Total securities (1)	7,670.2		48.0		2.77		6,512.3		34.0		2.37
Other	2,057.7		1.8		0.36		5,864.0		1.7		0.12
Total interest earning assets	55,811.3		484.5		3.58		39,098.8		334.1		3.55
Non-interest earning assets
Cash and due from banks	244.8						166.1
Allowance for credit losses	(261.9)						(289.1)
Bank owned life insurance	180.5						176.6
Other assets	3,298.8						1,271.2
Total assets	$	59,273.5					$	40,423.6
Interest-bearing liabilities
Interest-bearing deposits:
Interest-bearing transaction accounts	$	7,743.1	$	2.7	0.14	%	$	3,905.4	$	1.3	0.13	%
Savings and money market accounts	18,131.0		9.6		0.21		13,994.4		7.1		0.21
Certificates of deposit	1,920.2		1.8		0.38		1,681.1		2.4		0.59
Total interest-bearing deposits	27,794.3		14.1		0.21		19,580.9		10.8		0.22
Short-term borrowings	1,149.5		1.7		0.62		24.8		0.1		1.13
Long-term debt	769.9		10.8		5.67		—		—		—
Qualifying debt	896.0		8.4		3.81		547.2		5.9		4.39
Total interest-bearing liabilities	30,609.7		35.0		0.46		20,152.9		16.8		0.34
Interest cost of funding earning assets					0.26						0.18
Non-interest-bearing liabilities
Non-interest-bearing demand deposits	22,580.0						15,972.6
Other liabilities	1,094.9						772.3
Stockholders’ equity	4,988.9						3,525.8
Total liabilities and stockholders' equity	$	59,273.5					$	40,423.6
Net interest income and margin (4)			$	449.5	3.32	%			$	317.3	3.37	%

(1)Yields on loans and securities have been adjusted to a TEB. The taxable-equivalent adjustment was $8.0 million for the three months ended March 31, 2022 and 2021.

(2)Included in the yield computation are net loan fees of $29.1 million and $32.9 million for the three months ended March 31, 2022 and 2021, 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.

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	Three Months Ended March 31,
	2022 versus 2021
	Increase (Decrease) Due to Changes in (1)
	Volume		Rate		Total
	(in millions)
Interest income:
Loans held for sale	$	50.4	$	—	$	50.4
Loans:
Commercial and industrial	33.5		(18.6)		14.9
CRE - non-owner occupied	11.4		(3.3)		8.1
CRE - owner-occupied	(2.9)		1.3		(1.6)
Construction and land development	8.2		(2.1)		6.1
Residential real estate	60.8		(2.5)		58.3
Consumer	0.2		(0.1)		0.1
Total HFI loans	111.2		(25.3)		85.9
Securities:
Securities - taxable	5.4		6.0		11.4
Securities - tax-exempt	1.3		1.3		2.6
Total securities	6.7		7.3		14.0
Other	(3.3)		3.4		0.1
Total interest income	165.0		(14.6)		150.4
Interest expense:
Interest-bearing transaction accounts	1.3		0.1		1.4
Savings and money market	2.2		0.3		2.5
Certificates of deposit	0.2		(0.8)		(0.6)
Short-term borrowings	1.7		(0.1)		1.6
Long-term debt	10.8		—		10.8
Qualifying debt	3.3		(0.8)		2.5
Total interest expense	19.5		(1.3)		18.2
Net change	$	145.5	$	(13.3)	$	132.2

(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, 2022, interest income was $484.5 million, an increase of $150.4 million, or 45.0%, compared to $334.1 million for the three months ended March 31, 2021. This increase was primarily the result of an $85.9 million increase in interest income from HFI loans that was driven by a $12.8 billion increase in the average HFI loan balance, coupled with an increase of interest income from HFS loans of $50.4 million. Interest income from investment securities also increased by $14.0 million for the comparable period due to an increase in the average investment balance of $1.2 billion.

For the three months ended March 31, 2022, interest expense was $35.0 million, an increase of $18.2 million, or 108.3%, compared to $16.8 million for the three months ended March 31, 2021. This increase was primarily the result of an increase in borrowings resulting from the AmeriHome acquisition, combined with the issuance of $600.0 million in subordinated debt and $469.6 million in credit linked notes in 2021.

For the three months ended March 31, 2022, net interest income was $449.5 million, an increase of $132.2 million, or 41.7%, compared to $317.3 million for the three months ended March 31, 2021. The increase in net interest income reflects a $16.7 billion increase in average interest-earning assets, partially offset by an increase of $10.5 billion in average interest-bearing liabilities. The decrease in net interest margin of 5 basis points to 3.32% is largely the result of a decrease in loan yields due to a loan portfolio shift towards residential mortgage loans and higher borrowing costs. The decrease to net interest margin was partially offset by higher investment yields compared to the same period in 2021.

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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 allowance for credit losses at a level that is adequate to absorb estimated lifetime credit losses inherent in the loan and investment securities portfolios at the time that the loan is originated or the security is purchased. 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, 2022, the Company recorded a provision for credit losses of $9.0 million, compared to a release of credit loss provisions of $32.4 million for the three months ended March 31, 2021. The increase in the provision for credit losses from the three months ended March 31, 2021 is primarily related to loan growth.

Non-interest Income

The following table presents a summary of non-interest income for the periods presented: 

	Three Months Ended March 31,
	2022		2021		Increase (Decrease)
	(in millions)
Net loan servicing revenue	$	41.1	$	—	$	41.1
Net gain on loan origination and sale activities	36.9		—		36.9
Service charges and fees	7.0		6.7		0.3
Gain on sales of investment securities	6.9		0.1		6.8
Commercial banking related income	5.1		3.4		1.7
Income from equity investments	4.1		7.6		(3.5)
Gain on recovery from credit guarantees	2.3		—		2.3
Fair value loss on assets measured at fair value, net	(6.6)		(1.5)		(5.1)
Other income	9.5		3.4		6.1
Total non-interest income	$	106.3	$	19.7	$	86.6

Total non-interest income for the three months ended March 31, 2022 compared to the same period in 2021 increased $86.6 million. The increase in non-interest income was driven by mortgage banking revenue as net loan servicing revenue and net gain on loan purchase, origination, and sale activities totaled $41.1 million and $36.9 million, respectively, for the three months ended March 31, 2022.

Non-interest Expense

The following table presents a summary of non-interest expense for the periods presented:

	Three Months Ended March 31,
	2022		2021		Increase (Decrease)
	(in millions)
Salaries and employee benefits	$	138.3	$	83.7	$	54.6
Legal, professional, and directors' fees	24.0		10.1		13.9
Data processing	17.6		9.9		7.7
Occupancy	12.8		8.6		4.2
Loan servicing expenses	10.8		—		10.8
Deposit costs	9.3		6.3		3.0
Insurance	7.2		4.2		3.0
Loan acquisition and origination expenses	6.5		—		6.5
Business development and marketing	4.4		1.4		3.0
Net loss (gain) on sales and valuations of repossessed and other assets	0.1		(0.3)		0.4
Acquisition and restructure expenses	0.4		0.4		—
Other expense	17.2		10.7		6.5
Total non-interest expense	248.6		135.0		113.6

Total non-interest expense for the three months ended March 31, 2022 increased $113.6 million compared to the same period in 2021. The increase in non-interest expense was driven by the AmeriHome acquisition, which contributed to the increase in salaries and employee benefits of $54.6 million from the addition of approximately 1,000 employees and also the addition of expenses associated with mortgage banking activities, including loan servicing expenses of $10.8 million and loan acquisition

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and origination expenses of $6.5 million. In addition, the Company recognized increases in legal, professional, and directors' fees of $13.9 million and data processing expenses of $7.7 million, which were primarily related to an increase in IT and consulting initiatives as well as the integration of AmeriHome.

Income Taxes

The Company's effective tax rate was 19.5% and 17.9% for the three months ended March 31, 2022 and 2021, respectively. The increase in the effective tax rate was primarily due to projected pretax book income growth outpacing growth in permanent tax benefit items for the year and an increase in state tax expense.

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

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

The following tables present selected operating segment information for the periods presented:

	Consolidated Company		Commercial		Consumer Related		Corporate & Other
At March 31, 2022	(in millions)
HFI loans, net of deferred loan fees and costs	$	41,119.1	$	25,794.8	$	15,324.3	$	—
Deposits	52,159.5		30,133.6		18,527.6		3,498.3
At December 31, 2021
HFI loans, net of deferred loan fees and costs	$	39,075.4	$	25,092.4	$	13,983.0	$	—
Deposits	47,612.0		30,466.8		15,362.9		1,782.3

Three Months Ended March 31, 2022	(in millions)
Pre-tax income (loss)	$	298.2	$	236.8	$	126.9	$	(65.5)
Three Months Ended March 31, 2021
Pre-tax income (loss)	$	234.4	$	220.9	$	71.5	$	(58.0)

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BALANCE SHEET ANALYSIS

Total assets increased $4.6 billion, or 8.2%, to $60.6 billion at March 31, 2022, compared to $56.0 billion at December 31, 2021. The increase in total assets was driven by continued organic loan and deposit growth, which contributed to an increase in cash of $2.1 billion as well as an increase in investment securities. HFI loans increased by $2.0 billion, or 5.2%, to $41.1 billion as of March 31, 2022, compared to $39.1 billion as of December 31, 2021. The increase in HFI loans from December 31, 2021 was driven by increases in residential real estate loans of $2.0 billion, CRE, non-owner occupied loans of $323.2 million, and construction and land development loans of $255.0 million. These increases were partially offset by decreases in commercial and industrial loans of $435.6 million and CRE, owner occupied loans of $92.7 million. In addition, HFS loans decreased by $873.5 million, down from $5.6 billion as of December 31, 2021.

Total liabilities increased $4.5 billion, or 8.9%, to $55.6 billion at March 31, 2022, compared to $51.0 billion at December 31, 2021. The increase in liabilities is due primarily to an increase in total deposits of $4.5 billion, or 9.6%, to $52.2 billion. The increase in deposits from December 31, 2021 was driven by increases of $2.2 billion in non-interest bearing demand deposits, $1.3 billion in interest bearing demand deposits, and $1.3 billion in savings and money market accounts. These increases were partially offset by a decrease in certificates of deposit of $237.7 million. Other borrowings also decreased $668.6 million due to a decrease in overnight borrowings of $675.0 million.

Total stockholders’ equity $5.0 billion at March 31, 2022 increased by $49.0 million, or 1.0%, from December 31, 2021. The increase in stockholders' equity is primarily a function of net income and net proceeds of $107.7 million from issuance of common stock during the three months ended March 31, 2022, partially offset by quarterly dividends to shareholders and unrealized losses on AFS securities, net of tax, of $247.9 million recorded 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 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 as part of AOCI in stockholders’ equity, net of tax. 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 customer repurchase agreements, and to manage liquidity, capital, and interest rate risk.

The following table summarizes the carrying value of the investment securities portfolio for each of the periods below: 

	March 31, 2022		December 31, 2021		Increase (Decrease)
	(in millions)
Debt securities
CLO	$	2,055.3	$	926.2	$	1,129.1
Commercial MBS issued by GSEs	62.2		68.5		(6.3)
Corporate debt securities	415.3		382.9		32.4
Private label residential MBS	1,554.3		1,724.9		(170.6)
Residential MBS issued by GSEs	1,905.0		1,993.4		(88.4)
Tax-exempt	1,942.8		2,105.3		(162.5)
U.S. treasury securities	—		13.0		(13.0)
Other	78.3		81.7		(3.4)
Total debt securities	$	8,013.2	$	7,295.9	$	717.3
Equity securities
CRA investments	$	52.3	$	44.6	$	7.7
Preferred stock	112.4		113.9		(1.5)
Total equity securities	$	164.7	$	158.5	$	6.2

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Loans HFS

The Company began acquiring loans held for sale through the AmeriHome acquisition and as part of its ongoing mortgage banking business, the Company continues to purchase residential mortgage loans for sale or securitization. At March 31, 2022, the Company had $4.8 billion of loans HFS, compared to $5.6 billion at December 31, 2021.

Loans HFI

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

	March 31, 2022		December 31, 2021		Increase (Decrease)
	(in millions)
Warehouse lending	$	4,530.2	$	5,155.9	$	(625.7)
Municipal & nonprofit	1,497.0		1,579.2		(82.2)
Tech & innovation	1,538.5		1,417.8		120.6
Equity fund resources	3,688.5		3,829.8		(141.4)
Other commercial and industrial	6,752.5		6,465.7		286.8
CRE - owner occupied	1,635.7		1,723.7		(88.1)
Hotel franchise finance	2,694.7		2,534.0		160.8
Other CRE - non-owner occupied	4,115.1		3,951.8		163.3
Residential	11,234.9		9,242.8		1,992.1
Construction and land development	3,264.4		3,005.8		258.7
Other	167.6		168.9		(1.4)
Total loans HFI	41,119.1		39,075.4		2,043.7
Allowance for credit losses	(257.6)		(252.5)		(5.1)
Total loans HFI, net of allowance	$	40,861.5	$	38,822.9	$	2,038.6

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 allowance for credit losses. Net deferred loan fees of $92.5 million and $85.7 million reduced the carrying value of loans as of March 31, 2022 and December 31, 2021, respectively. Net unamortized purchase premiums on acquired and purchased loans of $205.8 million and $184.8 million increased the carrying value of loans as of March 31, 2022 and December 31, 2021, respectively.

Concentrations of Lending Activities

The Company monitors concentrations of lending activities at the product and borrower relationship level. The Company’s loan portfolio includes significant credit exposure to the CRE market. Commercial and industrial loans made up 43% and 47% of the Company's HFI loan portfolio as of March 31, 2022 and December 31, 2021, respectively. In addition, CRE related loans accounted for approximately 29% of total loans at March 31, 2022 and December 31, 2021. Substantially all of these CRE loans are secured by first liens with an initial loan to value ratio of generally not more than 75%. Approximately 21% and 23% of these CRE loans, excluding construction and land loans, were owner-occupied at March 31, 2022 and December 31, 2021, respectively. No borrower relationships at both the commitment and funded loan level exceeded 5% of total HFI loans as of March 31, 2022 and December 31, 2021.

Non-performing Assets

Total non-performing loans increased by $18.3 million at March 31, 2022 to $93.9 million from $75.6 million at December 31, 2021.

	March 31, 2022			December 31, 2021
	(dollars in millions)
Total nonaccrual loans (1)	$	91.0		$	72.6
Loans past due 90 days or more on accrual status	—			—
Accruing troubled debt restructured loans	2.9			3.0
Total nonperforming loans	$	93.9		$	75.6
Other assets acquired through foreclosure, net	$	11.7		$	11.7
Nonaccrual loans to funded HFI loans	0.22		%	0.19		%
Loans past due 90 days or more on accrual status to funded HFI loans	—			—

(1)Includes non-accrual TDR loans of $19.3 million and $17.8 million at March 31, 2022 and December 31, 2021, respectively.

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Interest income that would have been recorded under the original terms of nonaccrual loans was $1.1 million and $1.5 million for the three months ended March 31, 2022 and 2021, respectively.

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

	March 31, 2022
	Nonaccrual Balance		Percent of Nonaccrual Balance		Percent of Total HFI Loans
	(dollars in millions)
Tech & innovation	$	18.1	19.9	%	0.04	%
Other commercial and industrial	12.4		13.6		0.03
CRE - owner occupied	10.5		11.6		0.03
Hotel franchise finance	10.2		11.2		0.02
Other CRE - non-owner occupied	13.7		15.1		0.03
Residential	22.6		24.8		0.06
Construction and land development	3.3		3.6		0.01
Other	0.2		0.2		0.00
Total non-accrual loans	$	91.0	100.0	%	0.22	%

	December 31, 2021
	Nonaccrual Balance		Percent of Nonaccrual Balance		Percent of Total HFI Loans
	(dollars in millions)
Tech & innovation	$	13.3	18.3	%	0.03	%
Equity fund resources	0.6		0.8		0.00
Other commercial and industrial	16.1		22.2		0.05
CRE - owner occupied	13.0		17.9		0.03
Other CRE - non-owner occupied	13.1		18.0		0.03
Residential	15.1		20.8		0.05
Construction and land development	1.0		1.4		0.00
Other	0.4		0.6		0.00
Total non-accrual loans	$	72.6	100.0	%	0.19	%

Troubled Debt Restructured Loans

A TDR loan is a loan on which the Company, for reasons related to a borrower’s financial difficulties, grants a concession to the borrower that the Company would not otherwise consider. The loan terms that have been modified or restructured due to a borrower’s financial situation include, but are not limited to, a reduction in the stated interest rate, an extension of the maturity or renewal of the loan at an interest rate below current market, a reduction in the face amount of the debt, a reduction in the accrued interest, or deferral of interest payments. The majority of the Company's modifications are extensions in terms or deferral of payments which result in no lost principal or interest followed by reductions in interest rates or accrued interest. Consistent with regulatory guidance, a TDR loan that is subsequently modified in another restructuring agreement but has shown sustained performance and classification as a TDR, will be removed from TDR status provided that the modified terms were market-based at the time of modification.

The following table presents TDR loans:

	March 31, 2022			December 31, 2021
	Number of Loans	Recorded Investment		Number of Loans	Recorded Investment
	(dollars in millions)
Tech & innovation	1	$	4.1	2	$	2.1
Other commercial and industrial	7	5.9		7	6.2
CRE - owner occupied	1	0.5		1	0.5
Other CRE - non-owner occupied	5	10.7		5	11.0
Construction and land development	1	1.0		1	1.0
Total	15	$	22.2	16	$	20.8

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The allowance for credit losses on TDR loans totaled $1.0 million and zero as of March 31, 2022 and December 31, 2021, respectively. As of March 31, 2022, outstanding commitments on TDR loans totaled $4.0 million. There were no outstanding commitments on TDR loans as of December 31, 2021.

Allowance for Credit Losses on HFI Loans

The allowance for credit losses consists of the allowance for credit losses on loans and an allowance for credit losses on unfunded loan commitments. The allowance for credit losses on HTM securities is estimated separately from loans and is discussed within the Investment Securities section.

The following table summarizes the allocation of the allowance for credit losses on HFI loans by loan portfolio segment:

	March 31, 2022						December 31, 2021
	Allowance for credit losses		Percent of total allowance for credit losses		Percent of loan type to total HFI loans		Allowance for credit losses		Percent of total allowance for credit losses		Percent of loan type to total HFI loans
	(dollars in millions)						(dollars in millions)
Warehouse lending	$	2.9	1.1	%	11.0	%	$	3.0	1.2	%	13.2	%
Municipal & nonprofit	13.4		5.2		3.6		13.7		5.4		4.1
Tech & innovation	28.0		10.9		3.8		25.7		10.2		3.6
Equity fund resources	6.6		2.6		9.0		9.6		3.8		9.8
Other commercial and industrial	115.7		44.9		16.4		103.6		41.0		16.5
CRE - owner occupied	8.1		3.1		4.0		10.6		4.2		4.4
Hotel franchise finance	30.6		11.9		6.6		41.5		16.4		6.5
Other CRE - non-owner occupied	15.3		5.9		10.0		16.9		6.7		10.1
Residential	23.8		9.2		27.3		12.5		5.0		23.7
Construction and land development	10.7		4.2		7.9		12.5		5.0		7.7
Other	2.5		1.0		0.4		2.9		1.1		0.4
Total	$	257.6	100.0	%	100.0	%	$	252.5	100.0	%	100.0	%

During the three months ended March 31, 2022 and 2021, net loan charge-offs to average loans outstanding was approximately 0.00% and 0.02%, respectively.

In addition to the allowance for credit losses on funded HFI loans, the Company maintains a separate allowance for credit losses related to off-balance sheet credit exposures, including unfunded loan commitments. This allowance balance totaled $43.3 million and $37.6 million at March 31, 2022 and December 31, 2021, respectively, and is included in Other liabilities on the Consolidated Balance Sheets.

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Problem Loans

The Company classifies loans consistent with federal banking regulations using a nine category grading system. These loan grades are described in further detail in "Note 1. Summary of Significant Accounting Policies" in the Notes to Unaudited Consolidated Financial Statements" of this report. 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, 2022
	Number of Loans	Problem Loan Balance		Percent of Problem Loan Balance		Percent of Total HFI Loans
	(dollars in millions)
Municipal & nonprofit	1	$	6.0	1.6	%	0.01	%
Tech & innovation	14	34.8		9.6		0.08
Other commercial and industrial	65	51.7		14.2		0.13
CRE - owner occupied	7	2.9		0.8		0.01
Hotel franchise finance	11	173.9		47.8		0.42
Other CRE - non-owner occupied	10	31.9		8.8		0.08
Residential	48	23.6		6.5		0.06
Construction and land development	2	9.0		2.5		0.02
Other	17	29.8		8.2		0.07
Total	175	$	363.6	100.0	%	0.88	%

	December 31, 2021
	Number of Loans	Problem Loan Balance		Percent of Problem Loan Balance		Percent of Total HFI Loans
	(dollars in millions)
Tech & innovation	13	$	38.9	11.4	%	0.10	%
Other commercial and industrial	66	60.6		17.9		0.16
CRE - owner occupied	14	16.0		4.7		0.04
Hotel franchise finance	9	138.7		40.9		0.35
Other CRE - non-owner occupied	5	11.6		3.4		0.03
Residential	35	15.7		4.6		0.04
Construction and land development	7	28.1		8.3		0.07
Other	17	29.8		8.8		0.08
Total	166	$	339.4	100.0	%	0.87	%

Mortgage Servicing Rights

The fair value of the Company's MSRs related to residential mortgage loans totaled $950.3 million as of March 31, 2022.

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

	March 31, 2022		December 31, 2021
	(in millions)
FNMA and FHLMC	$	45,495.2	$	38,753.9
GNMA	18,732.5		14,379.3
Non-agency	1,319.0		1,214.4
Total unpaid principal balance of loans	$	65,546.7	$	54,347.6

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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 totaling $529.8 million at March 31, 2022. The increase from $491.3 million at December 31, 2021 is attributable to the DST acquisition in January 2022. See "Note 2. Mergers, Acquisitions and Dispositions" for further discussion of the acquisition.

The Company performs its annual goodwill and intangibles 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, 2022 and 2021, there were no events or circumstances that indicated an interim impairment test of goodwill or other intangible assets was necessary.

Deferred Tax Assets

As of March 31, 2022, the net DTA balance totaled $67.6 million, an increase of $46.7 million from $20.9 million at December 31, 2021. This overall increase in the net DTA was primarily the result of decreases in the fair market value of AFS securities, which were not fully offset by increases to MSRs.

At March 31, 2022 and December 31, 2021, the Company had no deferred tax valuation allowance.

Deposits

Deposits are the primary source for funding the Company's asset growth. Total deposits increased to $52.2 billion at March 31, 2022, from $47.6 billion at December 31, 2021, an increase of $4.5 billion, or 9.6%. By deposit type, the increase in deposits is primarily attributable to increases in non-interest bearing demand deposits of $2.2 billion, interest bearing demand deposits of $1.3 billion, and savings and money market accounts of $1.3 billion. These increases were partially offset by a decrease in certificates of deposit of $237.7 million.

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, 2022, the Company had $710.3 million of CDARS deposits and $2.0 billion of ICS deposits, compared to $729.2 million of CDARS deposits and $1.8 billion of ICS deposits at December 31, 2021. At March 31, 2022 and December 31, 2021, the Company also had wholesale brokered deposits of $2.5 billion and $1.8 billion, respectively.

In addition, deposits for which the Company provides account holders with earnings credits or referral fees totaled $13.1 billion and $10.8 billion at March 31, 2022 and December 31, 2021, respectively. The Company incurred $8.7 million and $5.8 million in deposit related costs on these deposits during the three months ended March 31, 2022 and 2021, respectively. These costs are reported in Deposit costs as part of non-interest expense. The increase in these costs from the prior year is due to an increase in 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,
	2022				2021
	Average Balance		Rate		Average Balance		Rate
	(dollars in millions)
Interest-bearing transaction accounts	$	7,743.1	0.14	%	$	3,905.4	0.13	%
Savings and money market accounts	18,131.0		0.21		13,994.4		0.21
Certificates of deposit	1,920.2		0.38		1,681.1		0.59
Total interest-bearing deposits	27,794.3		0.21		19,580.9		0.22
Non-interest-bearing demand deposits	22,580.0		—		15,972.6		—
Total deposits	$	50,374.3	0.11	%	$	35,553.5	0.12	%

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Other Borrowings

Short-Term Borrowings

The Company utilizes short-term borrowed funds to support short-term liquidity needs generally created by increased loan demand. The majority of these short-term borrowed funds consist of advances from the FHLB, federal funds purchased from correspondent banks or the FHLB, and customer repurchase agreements. 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 borrowing capacity from other sources, collateralized by securities, including securities 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 securities. At March 31, 2022, total short-term borrowed funds consisted of secured borrowings of $52.3 million and customer repurchase agreements of $18.0 million. At December 31, 2021, total short-term borrowed funds consisted of federal funds purchased of $675.0 million, secured borrowings of $35.3 million, and customer repurchase agreements of $16.6 million.

Long-Term Borrowings

The Company's long-term borrowings consist of AmeriHome senior notes from the acquisition on April 7, 2021 and credit linked notes issued during the year ended December 31, 2021, inclusive of issuance costs and fair market value adjustments. At March 31, 2022, the carrying value of long-term borrowings was $763.0 million, compared to $775.0 million at December 31, 2021.

Qualifying Debt

Qualifying debt consists of subordinated debt and junior subordinated debt, inclusive of issuance costs and fair market value adjustments. At March 31, 2022, the carrying value of qualifying debt was $893.3 million, compared to $895.8 million at December 31, 2021.

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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.

In connection with its adoption of CECL on January 1, 2020, the Company elected the five-year CECL transition option that delayed the estimated impact on regulatory capital resulting from the adoption of CECL. As a result of this election, the estimated impact of CECL on regulatory capital relative to regulatory capital determined under the prior incurred loss methodology was delayed for two years, followed by a three-year transition period to phase out the aggregate amount of capital benefit provided during the initial two-year delay. Beginning as of March 31, 2022, capital ratios and amounts include a 25% reduction to the capital benefit that resulted from the increased allowance for credit losses related to the adoption of ASC 326.

As a result of the Company's continued commercial loan growth and the acquisition of AmeriHome, the Company continues to undertake various capital actions to ensure that its capital levels remain strong, which during the three months ended March 31, 2022, included sales of common stock under the Company's ATM program. As of March 31, 2022 and December 31, 2021, 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 as of the periods indicated:

	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, 2022
WAL	$	5,745.7	$	4,667.9	$	47,772.1	$	58,687.4	12.0	%	9.8	%	8.0	%	9.0	%
WAB	5,393.0		4,907.8		47,728.8		58,689.3		11.3		10.3		8.4		10.3
Well-capitalized ratios									10.0		8.0		5.0		6.5
Minimum capital ratios									8.0		6.0		4.0		4.5
December 31, 2021
WAL	$	5,499.0	$	4,444.3	$	44,697.0	$	56,972.9	12.3	%	9.9	%	7.8	%	9.1	%
WAB	5,119.9		4,657.5		44,726.1		56,961.6		11.4		10.4		8.2		10.4
Well-capitalized ratios									10.0		8.0		5.0		6.5
Minimum capital ratios									8.0		6.0		4.0		4.5

With the acquisition of AmeriHome, 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, 2022.

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Critical Accounting Estimates

Critical accounting policies 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, 2021, 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, including the ongoing COVID-19 pandemic.

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, HFS mortgages, and non-pledged marketable securities, is a result of the Company's operating, investing, and financing activities and related cash flows. In order to ensure funds are available when necessary, on at least a quarterly basis, the Company projects the amount of funds that will be required over a twelve-month period and it also strives to maintain relationships with a diversified customer base. Liquidity requirements 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, 2022
	Available Balance		Outstanding Balance
	(in millions)
Unsecured fed funds credit lines at correspondent banks	$	3,548.4	$	—

In addition to lines of credit, the Company has borrowing capacity with the FHLB and FRB from pledged loans and securities. The Company also has warehouse borrowing lines of credit assumed as part of the AmeriHome acquisition. The borrowing capacity, outstanding borrowings, and available credit as of March 31, 2022 are presented in the following table:

	March 31, 2022
	(in millions)
FHLB:
Borrowing capacity	$	9,876.0
Outstanding borrowings	—
Letters of credit	21.0
Total available credit	$	9,855.0
FRB:
Borrowing capacity	$	4,069.4
Outstanding borrowings	—
Total available credit	$	4,069.4
Warehouse borrowings:
Borrowing capacity	$	1,000.0
Outstanding borrowings	—
Total available credit	$	1,000.0

The Company has a formal liquidity policy and, in the opinion of management, its liquid assets are considered adequate to meet cash flow needs for loan funding and deposit cash withdrawals for the next 90-120 days. At March 31, 2022, there was $10.5 billion in liquid assets, comprised of $2.6 billion in cash and cash equivalents, $2.7 billion in HFS loans, and $5.1 billion in

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unpledged marketable securities. At December 31, 2021, the Company maintained $8.7 billion in liquid assets, comprised of $516.4 million of cash and cash equivalents, $4.0 billion in HFS loans, and $4.2 billion of unpledged marketable securities.

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. Since deposits are taken by WAB and not by the Parent, Parent liquidity is not dependent on the Bank's deposit balances. In the Company's analysis of Parent liquidity, it is assumed that 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, 2022, 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, 2022 and 2021, net cash provided by operating activities was $622.9 million and $100.1 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 provided by and used in investing activities has been primarily influenced by its loan and securities activities. The Company's cash balance during the three months ended March 31, 2022 and 2021 was reduced by $2.0 billion and $1.6 billion, respectively, as a result of a net increase in loans as well as a net increase in investment securities of $517.7 million and $2.4 billion, respectively.

Net cash provided by financing activities has been impacted significantly by increased deposit levels. During the three months ended March 31, 2022 and 2021, net deposits increased $4.5 billion and $6.5 billion, respectively.

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 $50.0 million and $150.0 million, respectively, through one participating financial institution or, a combined total of $200.0 million per individual customer, with the entire amount being covered by FDIC insurance. As of March 31, 2022, the Company has $710.3 million of CDARS and $2.0 billion of ICS deposits.

As of March 31, 2022, the Company has $2.5 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, 2022, there were no dividends paid from WAB to the Parent. Subsequent to March 31, 2022, WAB paid dividends to the Parent of $50.0 million.

87

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 limited to 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.

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 maintain 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, the BOD may direct management to adjust the asset and liability mix to bring interest rate risk within Board-approved limits.

Net Interest Income Simulation. In order to measure interest rate risk at March 31, 2022, 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 that do not take into consideration any future anticipated rate hikes, 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 immediately 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 concurrently with interest rate changes taken by the FOMC.

This analysis indicates the impact of changes in net interest income for the given set of rate changes and assumptions. It assumes the balance sheet remains static and that its structure does not change over the course of the year. 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.

Furthermore, loan prepayment rate estimates and spread relationships change regularly. Interest rate changes create changes in actual loan prepayment speeds that will differ from the market estimates incorporated in this analysis. Changes that vary significantly from the modeled assumptions may have a significant effect on the Company's actual net interest income.

88

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. At March 31, 2022, our net interest income exposure for the next twelve months related to these hypothetical changes in market interest rates was within our current guidelines.

Sensitivity of Net Interest Income

	Parallel Shift Rate Scenario (change in basis points from Base)
	Down 100			Base		Up 100			Up 200
	(in millions)
Interest Income	$	1,818.1		$	1,940.8	$	2,200.2		$	2,494.2
Interest Expense	122.1			157.0		295.6			436.0
Net Interest Income	$	1,696.0		$	1,783.8	$	1,904.6		$	2,058.2
% Change	(4.9)		%			6.8		%	15.4		%

	Interest Rate Ramp Scenario (change in basis points from Base)
	Down 100			Base		Up 100			Up 200
	(in millions)
Interest Income	$	1,878.3		$	1,940.8	$	2,043.2		$	2,158.5
Interest Expense	133.0			157.0		218.8			281.9
Net Interest Income	$	1,745.3		$	1,783.8	$	1,824.4		$	1,876.6
% Change	(2.2)		%			2.3		%	5.2		%

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. 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.

At March 31, 2022, the Company's EVE exposure related to these hypothetical changes in market interest rates was within the Company's current guidelines. The following table shows the Company's projected change in EVE for this set of rate shocks at March 31, 2022:

Economic Value of Equity 

	Interest Rate Scenario (change in basis points from Base)
		Down 100			Base		Up 100			Up 200			Up 300
	(in millions)
Assets		$	61,370.4		$	59,294.1	$	57,526.5		$	56,007.0		$	54,699.0
Liabilities		50,034.7			48,541.2		47,213.1			46,018.4			44,936.8
Net Present Value		$	11,335.7		$	10,752.9	$	10,313.4		$	9,988.6		$	9,762.2
% Change		5.4		%			(4.1)		%	(7.1)		%	(9.2)		%

The computation of prospective effects of hypothetical interest rate changes are based on numerous assumptions, including relative levels of market interest rates, asset prepayments, and deposit decay, and should not be relied upon as indicative of actual results. Further, the computations do not contemplate any actions the Company may undertake in response to changes in interest rates. Actual amounts may differ from the projections set forth above should market conditions vary from the underlying assumptions.

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. The following table summarizes the aggregate notional amounts, market values, and terms of the Company’s derivative positions as of March 31, 2022 and December 31, 2021:

Outstanding Derivatives Positions

March 31, 2022					December 31, 2021
Notional		Net Value		Weighted Average Term (Years)	Notional		Net Value		Weighted Average Term (Years)
(dollars in millions)
$	440,144.9	$	(16.1)	1.4	$	480,765.9	$	(49.6)	1.5

89

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, 2022, 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.

90

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, 2021.

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:

	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 2022	349	$	95.20	—	$	—
February 2022	185,185	93.51		—	—
March 2022	—	—		—	—
Total	185,534	$	93.51	—	$	—

(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

Not applicable.

91

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 May 19, 2015 (incorporated by reference to Exhibit 3.2 of Western Alliance's Form 8-K filed with the SEC on May 22, 2015).
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).
10.1±	Letter Agreement, dated as of April 6, 2022, between Western Alliance Bancorporation and Kenneth A. Vecchione (incorporated by reference to Exhibit 10.1 of Western Alliance's Form 8-K filed with the SEC on April 7, 2022).
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, 2022 and December 31, 2021, (ii) the Consolidated Income Statements for the three months ended March 31, 2022 and March 31, 2021 and three months ended March 31, 2022 and 2021, (iii) the Consolidated Statements of Comprehensive Income for the three months ended March 31, 2022 and March 31, 2021 and three months ended March 31, 2022 and 2021, (iv) the Consolidated Statements of Stockholders’ Equity for the three months ended March 31, 2022 and March 31, 2021 and the three months March 31, 2022 and 2021, (v) the Consolidated Statements of Cash Flows for the three months ended March 31, 2022 and 2021, 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.) (Filed herewith).
104	The cover page of Western Alliance Bancorporation’s Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2022, formatted in Inline XBRL (contained in Exhibit 101).

*    Filed herewith.

**     Furnished herewith.

±    Management contract or compensatory arrangement.

92

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
April 29, 2022	By:	/s/ Kenneth A. Vecchione
		Kenneth A. Vecchione
		President and Chief Executive Officer
April 29, 2022	By:	/s/ Dale Gibbons
		Dale Gibbons
		Vice Chairman and Chief Financial Officer
April 29, 2022	By:	/s/ J. Kelly Ardrey Jr.
		J. Kelly Ardrey Jr.
		Chief Accounting Officer

93

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:	April 29, 2022	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:	April 29, 2022	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, 2022, 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:	April 29, 2022	/s/ Kenneth A. Vecchione
		President and Chief Executive Officer
		Western Alliance Bancorporation
Date:	April 29, 2022	/s/ Dale Gibbons
		Vice Chairman and Chief Financial Officer
		Western Alliance Bancorporation

XML

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2022	Apr. 25, 2022
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2022
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 Central Index Key	0001212545
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q1
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		108,282,445
Common Stock [Member]
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	3 Months Ended
	Mar. 31, 2022		Dec. 31, 2021
Assets:
Cash and due from banks	$ 266.5		$ 166.2
Interest-bearing deposits in other financial institutions	2,335.8		350.2
Cash, cash equivalents and restricted cash	2,602.3		516.4
Debt Securities, Available-for-sale	6,852.2	[1]	6,188.8	[2]
Debt Securities, Held-to-maturity, Net of Allowance	1,157.8		1,101.9
Debt Securities, Held-to-maturity, Allowance for Credit Loss	(3.2)		(5.2)
Investment securities - equity	164.7	[1]	158.5	[2]
Investments in restricted stock, at cost	101.9		91.7
Loans Receivable Held-for-sale, Amount	4,761.6		5,635.1
Loans:
Loans and Leases Receivable, Net of Deferred Income	41,119.1		39,075.4
Less: Allowance for credit losses	(257.6)		(252.5)
Net loans held for investment	40,861.5		38,822.9
Servicing Asset	950.3		698.0
Premises and equipment, net	196.3		181.9
Operating Lease, Right-of-Use Asset	141.8		133.0
Bank owned life insurance	178.9		180.2
Goodwill and intangible assets, net	698.2		634.8
Deferred Income Tax Assets, Net	67.6		20.9
Investments in LIHTC and renewable energy	729.9		631.3
Other assets	1,111.1		987.2
Total assets	60,576.1		55,982.6
Deposits:
Non-interest-bearing demand	23,520.4		21,353.4
Interest-bearing	28,639.1		26,258.6
Total deposits	52,159.5		47,612.0
Customer repurchase agreements	18.0		16.6
Other borrowings	833.3		1,501.9
Qualifying debt	893.3		895.8
Operating Lease, Liability	154.9		142.8
Other liabilities	1,523.5		867.5
Total liabilities	55,564.5		51,020.0
Commitments and Contingencies
Preferred Stock, Shares Outstanding	12,000,000		12,000,000
Preferred Stock, Shares Authorized	20,000,000		20,000,000
Preferred Stock, Liquidation Preference Per Share	$ 25		$ 25
Preferred Stock, Par or Stated Value Per Share	$ 0.0001		$ 0.0001
Preferred Stock, Value, Issued	$ 294.5		$ 294.5
Common Stock, Shares, Issued	110,824,061		108,981,341
Common stock, shares authorized	200,000,000		200,000,000
Stockholders’ equity:
Common Stock, Value, Issued	$ 2,083.7		$ 1,966.2
Treasury Stock, Value	(104.1)		(86.8)
Accumulated other comprehensive (loss) income	(235.1)		15.7
Retained earnings	2,972.6		2,773.0
Total stockholders’ equity	5,011.6		4,962.6
Total liabilities and stockholders’ equity	60,576.1		55,982.6
Dividends, Common Stock, Cash	(37.3)
Debt Securities, Held-to-maturity, Fair Value	$ 1,139.9		$ 1,146.4
Common stock, par value	$ 0.0001		$ 0.0001
Treasury Stock, Shares	2,535,555		2,350,021

[1] ratings differ, the Company uses an average of the available ratings by major credit agencies.

[2] For rated securities, if ratings differ, the Company uses an average of the available ratings by major credit agencies.

XML

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale, Amortized Cost	$ 7,165.5	$ 6,166.5
Debt Securities, Held-to-maturity, Fair Value	$ 1,139.9	$ 1,146.4
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	110,824,061	108,981,341
Treasury Stock, Value	$ 104.1	$ 86.8

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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands, shares in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Interest income:
Loans, including fees	$ 434,700	$ 298,400
Investment securities	46,700	32,800
Dividends and other	3,100	2,900
Total interest income	484,500	334,100
Interest expense:
Deposits	14,100	10,800
Qualifying debt	8,400	5,900
Other borrowings	12,500	100
Total interest expense	35,000	16,800
Net interest income	449,500	317,300
Provision for (recovery of) credit losses	9,000	32,400
Net interest income after provision for (recovery of) credit losses	440,500	349,700
Net gain on loan origination and sale activities	36,900	0
Non-interest income:
Service charges and fees	7,000	6,700
Income from equity instruments	4,100	7,600
Commercial banking related income	5,100	3,400
Unrealized gains (losses) on assets measured at fair value, net	(6,600)	(1,500)
Loan servicing fees, net	41,100	0
Other income	9,500	3,400
Total non-interest income	106,300	19,700
Non-interest expense:
Salaries and employee benefits	138,300	83,700
Expense Related to Distribution or Servicing and Underwriting Fees	10,800	0
Legal, professional, and directors' fees	24,000	10,100
Loan Processing Fee	6,500	0
Occupancy	12,800	8,600
Data processing	17,600	9,900
Deposit costs	9,300	6,300
Insurance	7,200	4,200
Business development and marketing	4,400	1,400
Net loss (gain) on sales and valuations of repossessed and other assets	100	(300)
Acquisition and restructure expenses	400	400
Other expense	17,200	10,700
Total non-interest expense	248,600	135,000
Income before provision for income taxes	298,200	234,400
Income Tax Expense (Benefit)	58,100	41,900
Net income	240,100	192,500
Net income available to common shareholders	$ 236,900	$ 192,500
Earnings per share:
Basic	$ 2.23	$ 1.91
Diluted	$ 2.22	$ 1.90
Weighted average number of common shares outstanding:
Basic	106.0	100.8
Diluted	106.6	101.4
Dividends declared per common share	$ 0.35	$ 0.25
Gain on sales of investment securities	$ 6,900	$ 100
Gain on recovery from credit guarantees	2,300	0
Preferred Stock Dividends, Income Statement Impact	$ 3,200	$ 0

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 240.1	$ 192.5
Other comprehensive income (loss), net:
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax	(247.9)	(72.0)
Unrealized loss on AFS securities, net of tax effect of $80.8 and $23.5, respectively	80.8	23.5
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Unrealized Gain (Loss) Arising During Period, after Tax	2.2	0.3
Unrealized gain (loss) on junior subordinated debt, net of tax effect of $(0.7) and $0.1, respectively	0.7	0.1
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	(5.1)	(0.1)
Realized gain on sale of AFS securities included in income, net of tax effect of $1.8 and approximately $0.0, respectively	(1.8)	0.0
Net other comprehensive loss	(250.8)	(72.4)
Comprehensive (loss) income	$ (10.7)	$ 120.1

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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid in Capital [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Preferred Stock [Member]
Beginning balance, shares at Dec. 31, 2020		100,800,000
Beginning balance at Dec. 31, 2020	$ 3,413.5	$ 0.0	$ 1,390.9	$ 71.1	$ 92.3	$ 2,001.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	192.5					192.5
Restricted stock grants, net, shares		(500,000)
Restricted stock grants, net	8.1		8.1
Treasury Stock, Shares, Acquired		200,000
Treasury Stock, Value, Acquired, Cost Method	12.9			12.9
Stock Issued During Period, Value, New Issues	$ 209.2		209.2
Stock Issued During Period, Shares, New Issues	2,300,000	2,300,000
Dividends, Common Stock, Cash	$ (25.3)					(25.3)
Other comprehensive (loss) income, net	(72.4)				(72.4)
Ending balance, shares at Mar. 31, 2021		103,400,000
Ending Balance at Mar. 31, 2021	3,712.7	$ 0.0	1,608.2	84.0	19.9	2,168.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Retained earnings	2,773.0
Beginning balance, shares at Dec. 31, 2021		106,600,000					12,000,000.0
Beginning balance at Dec. 31, 2021	4,962.6	$ 0.0	1,966.2	86.8	15.7	2,773.0	$ 294.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	240.1					240.1
Restricted stock grants, net, shares		600,000
Restricted stock grants, net	9.8		9.8
Treasury Stock, Shares, Acquired		200,000
Treasury Stock, Value, Acquired, Cost Method	17.3			17.3
Stock Issued During Period, Value, New Issues	$ 107.7		107.7
Stock Issued During Period, Shares, New Issues	1,300,000	1,300,000
Dividends, Common Stock, Cash	$ (37.3)					(37.3)
Other comprehensive (loss) income, net	(250.8)				(250.8)
Ending balance, shares at Mar. 31, 2022		108,300,000					12,000,000.0
Ending Balance at Mar. 31, 2022	5,011.6	$ 0.0	$ 2,083.7	$ 104.1	$ (235.1)	2,972.6	$ 294.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends, Preferred Stock, Cash	(3.2)					$ (3.2)
Retained earnings	$ 2,972.6

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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities:
Net income	$ 240.1	$ 192.5
Adjustments to reconcile net income to cash provided by operating activities:
Provision for (recovery of) credit losses	(9.0)	(32.4)
Depreciation and amortization	11.1	6.0
Stock-based compensation	9.8	8.0
Deferred income taxes	35.1	5.1
Amortization of net premiums for investment securities	6.9	10.7
Amortization of tax credit investments	13.4	15.5
Amortization of operating lease right of use asset	5.4	3.0
Amortization of net deferred loan fees and net purchase premiums	(12.5)	(19.2)
Payments for Origination and Purchases of Loans Held-for-sale	13,060.0	0.0
Proceeds from Sale and Collection of Loans Held-for-sale	13,663.0	0.0
Servicing Asset at Fair Value, Additions	204.1	0.0
Servicing Asset at Fair Value, Period Increase (Decrease)	55.4	0.0
Net (gains) losses on:
Equity Securities, FV-NI, Unrealized Gain (Loss)	6.6	1.5
Changes in other assets and liabilities, net	(39.4)	(89.9)
Net cash provided by operating activities	622.9	(100.1)
Payments to Acquire Debt Securities, Available-for-sale	830.6	2,748.5
Investment securities - AFS
Principal pay downs and maturities	257.1	(493.6)
Proceeds from sales	114.2	0.0
Debt Securities, Held-to-maturity [Abstract]
Purchases	60.5	131.6
Principal pay downs and maturities	6.7	0.7
Equity Securities, FV-NI, Gain (Loss) [Abstract]
Purchases	(4.7)	(28.3)
Redemptions	0.1	0.4
Proceeds from Sale of Mortgage Servicing Rights (MSR)	24.1	0.0
Net increase in loans HFI	(1,961.7)	(1,611.1)
Purchase of premises, equipment, and other assets, net	(26.2)	(10.4)
Net cash used in investing activities	(2,597.6)	4,058.9
Cash flows from financing activities:
Net increase in deposits	4,547.5	6,462.6
Repayments of Subordinated Debt	(9.5)	0.0
Net decrease in short-term borrowings	(514.5)	(0.1)
Cash paid for tax withholding on vested restricted stock and other	17.3	12.8
Cash dividends paid on common stock and preferred stock	40.5	25.3
Proceeds from Issuance of Common Stock	94.9	209.2
Net cash provided by financing activities	4,060.6	6,633.6
Net increase in cash, cash equivalents, and restricted cash	2,085.9	2,674.8
Cash, cash equivalents, and restricted cash at beginning of period	516.4	2,671.7
Cash, cash equivalents, and restricted cash at end of period	2,602.3	5,346.5
Interest Paid, Excluding Capitalized Interest, Operating Activities	25.9	15.0
Cash paid during the period for:
Income Taxes Paid, Net	24.2	30.8
Proceeds from Sale of Equity securities, FV-NI	$ 0.0	$ 0.6
Dividends declared per common share	$ 0.35	$ 0.25
Payments to Acquire Businesses, Net of Cash Acquired	$ 50.0	$ 0.0
Other Operating Activities, Cash Flow Statement	0.5	0.8
Purchase of Other Investments	(66.1)	(24.3)
Net increase (decrease) in unfunded commitments and obligations	157.4	102.8
Net increase in unsettled loans HFI and investment securities purchased	569.1	168.5
Transfers of securitized LHFS to AFS securities	$ 40.4	$ 0.0

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Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2022

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Nature of operation

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 blockchain-based 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 has added to its capabilities with the acquisition of DST on January 25, 2022, which provides digital payment services for the class action legal industry. In addition, the Company has two non-bank subsidiaries, which are LVSP, which held and managed certain OREO properties, and 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.

Basis of presentation

The accounting and reporting policies of the Company are in accordance with GAAP and conform to practices within the financial services industry. The accounts of the Company and its consolidated subsidiaries are included in the Consolidated Financial Statements.

Recent accounting pronouncements

Troubled Debt Restructurings and Vintage Disclosures

In March 2022, the FASB issued guidance within ASU 2022-02, Financial Instruments—Credit Losses (Topic 326). The amendments in this update eliminate the accounting guidance and related disclosures for TDRs by creditors in Subtopic 310-40, Receivables—Troubled Debt Restructurings by Creditors, while enhancing disclosure requirements for certain loan refinancings and restructurings by creditors when a borrower is experiencing financial difficulty and requiring an entity to disclose current-period gross writeoffs by year of origination for financing receivables and net investments in leases within the scope of Subtopic 326-20, Financial Instruments—Credit Losses—Measured at Amortized Cost.

The amendments in this update are effective for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years and are applied prospectively, except with respect to the recognition and measurement of TDRs, where an entity has the option to apply a modified retrospective transition method. Early adoption of the amendments in this update is permitted. An entity may elect to early adopt the amendments regarding TDRs and related disclosure enhancements separately from the amendments related to vintage disclosures. The adoption of this accounting guidance is not expected to have a material impact on the Company's Consolidated Financial Statements.

Recently adopted accounting guidance

Reference Rate Reform

In March 2020, the FASB issued guidance within ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting, in response to the scheduled discontinuation of LIBOR. Since the issuance of this guidance, the publication cessation of U.S. dollar LIBOR has been extended to June 30, 2023. The amendments in this update provide optional guidance designed to provide relief from the accounting analysis and impacts that may otherwise be required for modifications to agreements (e.g., loans, debt securities, derivatives, borrowings) necessitated by reference rate reform.

The following optional expedients for applying the requirements of certain ASC Topics or Industry Subtopics in the Codification are permitted for contracts that are modified because of reference rate reform and that meet certain scope guidance: 1) modifications of contracts within the scope of ASC Topics 310, Receivables, and 470, Debt, should be accounted for by prospectively adjusting the effective interest rate; 2) modifications of contracts within the scope of ASC Topic 842, Leases, should be accounted for as a continuation of the existing contracts with no reassessments of the lease classification and the discount rate or remeasurements of lease payments that otherwise would be required under this ASC Topic for modifications not accounted for as separate contracts; 3) modifications of contracts do not require an entity to reassess its original conclusion about whether that contract contains an embedded derivative that is clearly and closely related to the

economic characteristics and risks of the host contract under Subtopic ASC 815-15, Derivatives and Hedging- Embedded Derivatives; and 4) for other ASC Topics or Industry Subtopics in the Codification, the amendments in this update also include a general principle that permits an entity to consider contract modifications due to reference rate reform to be an event that does not require contract remeasurement at the modification date or reassessment of a previous accounting determination.

In January 2021, the FASB issued ASU 2021-01, Reference Rate Reform (Topic 848): Scope in order to clarify that certain optional expedients and exceptions in ASC Topic 848 apply to derivatives that are affected by the discounting transition. Specifically, certain provisions in ASC Topic 848, if elected by an entity, apply to derivative instruments that use an interest rate for margining, discount, or contract price alignment that is modified as a result of reference rate reform.

Due to the prospective nature of the revised guidance, the adoption of this accounting guidance did not have a material impact on the Company's Consolidated Financial Statements.

Convertible Debt and Derivatives and Hedging

In August 2020, the FASB issued guidance within ASU 2020-06, Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity’s Own Equity (Subtopic 815-40). The amendments in this update affect entities that issue convertible instruments and/or contracts indexed to and potentially settled in an entity’s own equity. This update simplifies the convertible accounting framework through elimination of the beneficial conversion and cash conversion accounting models for convertible instruments. It also amends the accounting for certain contracts in an entity’s own equity that are currently accounted for as derivatives because of specific settlement provisions. In addition, the new guidance modifies how particular convertible instruments and certain contracts that may be settled in cash or shares impact the diluted EPS computation. The Company adopted the amendments within ASU 2020-06 using the modified retrospective method. 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, particularly to the extent that economic conditions worsen or persist longer than expected in an adverse state, relate to: 1) the determination of the allowance for credit losses; 2) certain assets and liabilities carried at fair value; and 3) accounting for income taxes.

Principles of consolidation

As of March 31, 2022, 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 Mortgage.

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 have no effect on net income or stockholders’ equity as previously reported.

Interim financial information

The accompanying Unaudited Consolidated Financial Statements as of and for the three months ended March 31, 2022 and 2021 have been prepared in condensed format and, therefore, do not include all of the information and footnotes required by GAAP for complete financial statements. These statements have been prepared on a basis that is substantially consistent with the accounting principles applied to the Company's audited Consolidated Financial Statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2021.

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. The interim financial information should be read in conjunction with the Company's audited Consolidated Financial Statements.

Business combinations

Business combinations are accounted for under the acquisition method of accounting in accordance with ASC 805, Business Combinations. Under the acquisition method, the acquiring entity in a business combination recognizes all of the acquired assets and assumed liabilities at their estimated fair values as of the date of acquisition. Any excess of the purchase price over the fair value of net assets and other identifiable intangible assets acquired is recorded as goodwill. To the extent the fair value of net assets acquired, including identified intangible assets, exceeds the purchase price, a bargain purchase gain is recognized. Assets acquired and liabilities assumed from contingencies are also recognized at fair value if the fair value can be determined during the measurement period. Results of operations of an acquired business are included in the Consolidated Income Statement from the date of acquisition. Acquisition-related costs, including conversion and restructuring charges, are expensed as incurred.

Investment securities

Investment securities include debt and equity securities. Debt securities may be classified as HTM, AFS, or trading. The appropriate classification is initially decided at the time of purchase. Securities classified as HTM are those debt securities that the Company has both the intent and ability to hold to maturity regardless of changes in market conditions, liquidity needs, or general economic conditions. The sale of an HTM security within three months of its maturity date or after the majority of the principal outstanding has been collected is considered a maturity for purposes of classification and disclosure. Securities classified as AFS are debt securities that the Company intends to hold for an indefinite period of time, but not necessarily to maturity. Any decision to sell a security classified as AFS would be based on various factors, including significant movements in interest rates, changes in the maturity mix of the Company’s assets and liabilities, liquidity needs, decline in credit quality, and regulatory capital considerations.

HTM securities are carried at amortized cost. AFS securities are carried at their estimated fair value, with unrealized holding gains and losses reported in OCI, net of tax. When AFS debt securities are sold, the unrealized gains or losses are reclassified from OCI to non-interest income. Trading securities are carried at their estimated fair value, with changes in fair value reported in earnings as part of non-interest income.

Equity securities are carried at their estimated fair value, with changes in fair value reported in earnings as part of non-interest income.

Interest income is recognized based on the coupon rate and includes the amortization of purchase premiums and the accretion of purchase discounts. Premiums and discounts on investment securities are generally amortized or accreted over the contractual life of the security using the interest method. For the Company's mortgage-backed securities, amortization or accretion of premiums or discounts are adjusted for anticipated prepayments. Gains and losses on the sale of investment securities are recorded on the trade date and determined using the specific identification method.

A debt security is placed on nonaccrual status at the time its principal or interest payments become 90 days past due. Interest accrued but not received for a security placed on nonaccrual is reversed against interest income.

Allowance for credit losses on investment securities

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 Company measures expected credit losses on its HTM debt securities on a collective basis by major security type. The Company's HTM securities portfolio consists of low income housing tax-exempt bonds and private label residential MBS. Low income housing tax-exempt bonds share similar risk characteristics with the Company's CRE, non-owner occupied or construction and land loan pools, given the similarity in underlying assets or collateral. Accordingly, expected credit losses on HTM securities are estimated using the same models and approaches as these loan pools, which utilize risk parameters (probability of default, loss given default, and exposure at default) in the measurement of expected credit losses. The historical data used to estimate probability of default and severity of loss in the event of default is derived or obtained from internal and external sources and adjusted for the expected effects of reasonable and supportable forecasts over the expected lives of the securities on those historical losses. Accrued interest receivable on HTM securities, which is included in other assets on the Consolidated Balance Sheet, is excluded from the estimate of expected credit losses.

The credit loss model under ASC 326-30, applicable to AFS debt securities, requires recognition of credit losses through an allowance account with credit losses recognized once securities become impaired. For AFS debt securities, a decline in fair value due to credit loss results in recognition of an allowance for credit losses. Impairment may result from credit deterioration of the issuer or collateral underlying the security. An assessment to determine whether a decline in fair value resulted from a credit loss is performed at the individual security level. Among other factors, the Company considers: 1) the extent to which the fair value is less than the amortized cost basis; 2) the financial condition and near term prospects of the issuer, including consideration of relevant financial metrics or ratios of the issuer; 3) any adverse conditions related to an industry or geographic area of an issuer; 4) any changes to the rating of the security by a rating agency; and 5) any past due principal or interest payments from the issuer. If an assessment of the above factors indicates that a credit loss exists, the Company records an allowance for credit losses for the excess of the amortized cost basis over the present value of cash flows expected to be collected, limited to the amount that the security's fair value is less than its amortized cost basis. Subsequent changes in the allowance for credit losses are recorded as a provision for (or recovery of) credit loss expense. Interest accruals and amortization and accretion of premiums and discounts are suspended when the credit loss is recognized in earnings. Any interest received after the security has been placed on nonaccrual status is recognized on a cash basis. Accrued interest receivable on AFS debt securities, which is included in Other assets on the Consolidated Balance Sheet, is excluded from the estimate of expected credit losses.

For each AFS security in an unrealized loss position, the Company also considers: 1) its intent to retain the security until anticipated recovery of the security's fair value; and 2) whether it is more-likely-than not that the Company would be required to sell the security before recovery of its amortized cost basis. If either of the criteria regarding intent or requirement to sell is met, the debt security is written down to its fair value and the write-down is charged against the allowance for credit losses with any incremental impairment recorded in earnings.

Write-offs are made through reversal of the allowance for credit losses and a direct write-off of the amortized cost basis of the AFS security. The Company considers the following events to be indicators that a write-off should be taken: 1) bankruptcy of the issuer; 2) significant adverse event(s) affecting the issuer in which it is improbable for the issuer to make its remaining payments on the security; and 3) significant loss of value of the underlying collateral behind a security. Recoveries on debt securities, if any, are recorded in the period received.

Restricted stock

WAB is a member of the Federal Reserve System and, as part of its membership, is required to maintain stock in the FRB in a specified ratio to its capital. In addition, WAB is a member of the FHLB system and, accordingly, maintains an investment in the capital stock of the FHLB based on the borrowing capacity used. These investments are considered equity securities with no actively traded market. Therefore, the shares are considered restricted investment securities. These investments are carried at cost, which is equal to the value at which they may be redeemed. Dividend income received from the stock is reported in interest income. The Company conducts a periodic review and evaluation of its restricted stock to determine if any impairment exists. No impairment has been recorded to date.

Loans held for sale

The Company began holding loans HFS in connection with the AmeriHome acquisition and continues to purchase and originate loans as part of its mortgage banking business. Loans HFS are reported at fair value or the lower of cost or fair value, depending on the acquisition source. The Company has elected to record loans purchased from correspondent sellers or originated directly to consumers at fair value to more timely reflect the Company's performance. Changes in fair value of loans HFS are reported in current period income as a component of Net gain on loan origination and sale activities in the Consolidated Income Statement. Alternatively, delinquent loans repurchased under the terms of the GNMA MBS program, referred to as EBO loans, are reported at the lower of cost or fair value. For EBO loans, the amount by which cost exceeds fair value is accounted for as a valuation allowance and any changes in the valuation allowance are included in Net gain on loan origination and sale activities in the Consolidated Income Statement.

The Company recognizes a transfer of loans as a sale when it surrenders control over the transferred loans. Control is considered to be surrendered when the transferred loans have been legally isolated from the Company, the transferee has the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred loans, and the Company does not maintain effective control over the transferred loans through either an agreement that entitles or obligates the Company to repurchase or redeem the loans before their maturity or the ability to unilaterally cause the holder to return loans. If the transfer of loans qualifies as a sale, the Company derecognizes such loans. If the transfer of loans does not qualify as a sale, the proceeds from the transfer are accounted for as secured borrowings.

Loan acquisition and origination fees on loans HFS consist of fees earned by the Company for purchasing and originating loans and are recognized at the time the loans are purchased or originated. These fees generally represent flat, per loan fee amounts and are included as part of Net gain on loan origination and sale activities in the Consolidated Income Statement.

Recognition of interest income on non-government guaranteed or insured loans HFS is suspended and accrued unpaid interest receivable is reversed against interest income when loans become 90 days delinquent or when recovery of income and principal becomes doubtful. Loans return to accrual status when the principal and interest become current and it is probable that the amounts are fully collectible. For government guaranteed or insured loans HFS that are 90 days delinquent, the Company continues to recognize interest income at the debenture rate for FHA loans and at the note rate for VA and USDA loans, adjusted for probability of default.

Loans held for investment

Loans that management has the intent and ability to hold for the foreseeable future or until maturity or payoff are reported at amortized cost. Amortized cost is the amount of unpaid principal, adjusted for unamortized net deferred fees and costs, premiums and discounts, and write-offs. In addition, the amortized cost of loans subject to a fair value hedge are adjusted for changes in value attributable to the effective portion of the hedged benchmark interest rate risk.

The Company may also purchase loans or acquire loans through a business combination. At the purchase or acquisition date, loans are evaluated to determine whether there has been more than insignificant credit deterioration since origination. Loans that have experienced more than insignificant credit deterioration since origination are referred to as PCD loans. In its evaluation of whether a loan has experienced more than insignificant deterioration in credit quality since origination, the Company takes into consideration loan grades, loan-to-values greater than policy limits, past due and nonaccrual status, and TDR loans. The Company may also consider external credit rating agency ratings for borrowers and for non-commercial loans, FICO score or band, probability of default levels, and number of times past due. The initial estimate of credit losses on PCD loans is added to the purchase price on the acquisition date to establish the initial amortized cost basis of the loan; accordingly, the initial recognition of expected credit losses has no impact on net income. When the initial measurement of expected credit losses on PCD loans are calculated on a pooled loan basis, the expected credit losses are allocated to each loan within the pool. Any difference between the initial amortized cost basis and the unpaid principal balance of the loan represents a noncredit discount or premium, which is accreted (or amortized) into interest income over the life of the loan. Subsequent changes to the allowance for credit losses on PCD loans are recorded through the provision for credit losses. For purchased loans that are not deemed to have experienced more than insignificant credit deterioration since origination, any discounts or premiums included in the purchase price are accreted (or amortized) over the contractual life of the individual loan. For additional information, see "Note 5. Loans, Leases and Allowance for Credit Losses" of these Notes to Unaudited Consolidated Financial Statements.

In applying the effective yield method to loans, the Company generally applies the contractual method whereby loan fees collected for the origination of loans less direct loan origination costs (net of deferred loan fees), as well as premiums and discounts and certain purchase accounting adjustments, are amortized over the contractual life of the loan through interest income. If a loan has scheduled payments, the amortization of the net deferred fee is calculated using the interest method over the contractual life of the loan. If a loan does not have scheduled payments, such as a line of credit, the net deferred loan fee is recognized as interest income on a straight-line basis over the contractual life of the loan commitment. Commitment fees based

on a percentage of a customer’s unused line of credit and fees related to standby letters of credit are recognized over the commitment period. When loans are repaid, any remaining unamortized balances of premiums, discounts, or net deferred fees are recognized as interest income.

Nonaccrual loans

When a borrower discontinues making payments as contractually required by the note, the Company must determine whether it is appropriate to continue to accrue interest. The Company ceases accruing interest income when the loan has become delinquent by more than 90 days or when management determines that the full repayment of principal and collection of interest according to contractual terms is no longer likely. Past due status is based on the contractual terms of the loan. The Company may decide to continue to accrue interest on certain loans more than 90 days delinquent if the loans are well secured by collateral and in the process of collection.

For all HFI loan types, when a loan is placed on nonaccrual status, all interest accrued but uncollected is reversed against interest income in the period in which the status is changed, and the Company makes a loan-level decision to apply either the cash basis or cost recovery method. The Company may recognize income on a cash basis when a payment is received and only for those nonaccrual loans for which the collection of the remaining principal balance is not in doubt. Under the cost recovery method, subsequent payments received from the customer are applied to principal and generally no further interest income is recognized until the loan principal has been paid in full or until circumstances have changed such that payments are again consistently received as contractually required. Loans are returned to accrual status when all of the principal and interest amounts contractually due are brought current and future payments are reasonably assured.

Troubled Debt Restructured Loans

A TDR loan is a loan on which the Company, for reasons related to a borrower’s financial difficulties, grants a concession to the borrower that the Company would not otherwise consider. In order to determine whether a borrower is experiencing financial difficulty, an evaluation is performed to assess the probability that the borrower will be in payment default on any of its debt in the foreseeable future without the modification. The evaluation is performed in accordance with the Company's internal underwriting policy. The loan terms that may be modified or restructured due to a borrower’s financial situation include, but are not limited to, a reduction in the stated interest rate, an extension of the maturity or renewal of the loan at an interest rate below current market, a reduction in the face amount of the debt, a reduction in the accrued interest, or deferral of interest payments. A TDR loan may be returned to accrual status when the loan is brought current, has performed in accordance with the contractual restructured terms for a reasonable period of time (generally six months), and the ultimate collectability of the total contractual restructured principal and interest is no longer in doubt. Consistent with regulatory guidance, a TDR loan that is subsequently modified in another restructuring agreement but has shown sustained performance and classification as a TDR, will be removed from TDR status provided that the modified terms were market-based at the time of modification.

The CARES Act, signed into law on March 27, 2020, permitted financial institutions to suspend requirements under GAAP for loan modifications to borrowers affected by COVID-19 that would otherwise be characterized as TDRs and suspend any determination related thereto if (i) the loan modification was made between March 1, 2020 and December 31, 2020 and (ii) the applicable loan was not more than 30 days past due as of December 31, 2019. The Consolidated Appropriations Act, 2021, extended these provisions through January 1, 2022, which have now expired. In addition, federal bank regulatory authorities issued guidance to encourage financial institutions to make loan modifications for borrowers affected by COVID-19 and assured financial institutions that they will neither receive supervisory criticism for such prudent loan modifications, nor be required by examiners to automatically categorize COVID-19-related loan modifications as TDRs. The Company has been applying this guidance to qualifying loan modifications.

Credit quality indicators

Loans are regularly reviewed to assess credit quality indicators and to determine appropriate loan classification and grading in accordance with applicable bank regulations. The Company’s risk rating methodology assigns risk ratings ranging from 1 to 9, where a higher rating represents higher risk. The Company differentiates its loan segments based on shared risk characteristics for which expected credit losses are measured on a pool basis.

The nine risk rating categories can generally be described by the following groupings for loans:

"Pass" (grades 1 through 5): The Company has five pass risk ratings, which represent a level of credit quality that ranges from having no well-defined deficiency or weakness to some noted weakness; however, the risk of default on any loan classified as pass is expected to be remote. The five pass risk ratings are described below:

Minimal risk. Consist of loans that are fully secured either with cash held in a deposit account at the Bank or by readily marketable securities with an acceptable margin based on the type of security pledged.

Low risk. Consist of loans with a high investment grade rating equivalent.

Modest risk. Consist of loans where the credit facility greatly exceeds all policy requirements or with policy exceptions that are appropriately mitigated. A secondary source of repayment is verified and considered sustainable. Collateral coverage on these loans is sufficient to fully cover the debt as a tertiary source of repayment. Debt of the borrower is low relative to borrower’s financial strength and ability to pay.

Average risk. Consist of loans where the credit facility meets or exceeds all policy requirements or with policy exceptions that are appropriately mitigated. A secondary source of repayment is available to service the debt. Collateral coverage is more than adequate to cover the debt. The borrower exhibits acceptable cash flow and moderate leverage.

Acceptable risk. Consist of loans with an acceptable primary source of repayment, but a less than preferable secondary source of repayment. Cash flow is adequate to service debt, but there is minimal excess cash flow. Leverage is moderate or high.

"Special mention" (grade 6): These are generally assets that possess potential weaknesses that warrant management's close attention. These loans may involve borrowers with adverse financial trends, higher debt-to-equity ratios, or weaker liquidity positions, but not to the degree of being considered a “problem loan” where risk of loss may be apparent. Loans in this category are usually performing as agreed, although there may be non-compliance with financial covenants.

"Substandard" (grade 7): These assets are characterized by well-defined credit weaknesses and carry the distinct possibility that the Company will sustain some loss if such weakness or deficiency is not corrected. All loans 90 days or more past due and all loans on nonaccrual status are considered at least "Substandard," unless extraordinary circumstances would suggest otherwise.

"Doubtful" (grade 8): These assets have all the weaknesses inherent in those classified as "Substandard" with the added characteristic that the weaknesses present make collection or liquidation in full, on the basis of currently existing facts, conditions and values, highly questionable and improbable, but because of certain known factors that may work to the advantage and strengthening of the asset (for example, capital injection, perfecting liens on additional collateral and refinancing plans), classification as an estimated loss is deferred until a more precise status may be determined. Due to the high probability of loss, loans classified as "Doubtful" are placed on nonaccrual status.

"Loss" (grade 9): These assets are considered uncollectible and having such little recoverable value that it is not practical to defer writing off the asset. This classification does not mean that the loan has absolutely no recovery or salvage value, but rather that it is not practicable or desirable to defer writing off the asset, even though partial recovery may be achieved in the future.

Allowance for credit losses on HFI loans

Credit risk is inherent in the business of extending loans and leases to borrowers and is continuously monitored by management and reflected within the allowance for credit losses. The allowance for credit losses is an estimate of life-of-loan losses for the Company's loans HFI. The allowance for credit losses is a valuation account that is deducted from the amortized cost basis of a loan to present the net amount expected to be collected on the loan. Accrued interest receivable on these loans, which is included in Other assets on the Consolidated Balance Sheet, is excluded from the estimate of expected credit losses. Expected recoveries of amounts previously written off and expected to be written off are included in the valuation account and may not exceed the aggregate of amounts previously written off and expected to be written off. The Company formally re-evaluates and establishes the appropriate level of the allowance for credit losses on a quarterly basis.

Determining the appropriateness of the allowance is complex and requires judgment by management about the effect of matters that are inherently uncertain. In future periods, evaluations of the overall loan portfolio or particular segments of the loan portfolio, in light of the factors and forecasts then prevailing, may result in significant changes in the allowance for credit losses and credit loss expense in those future periods. The allowance level is influenced by loan volumes, mix, loan performance metrics, asset quality characteristics, delinquency status, historical credit loss experience, and the inputs and assumptions in economic forecasts, such as macroeconomic inputs, length of reasonable and supportable forecast periods, and reversion methods. The methodology for estimating the amount of expected credit losses reported in the allowance for credit losses has two basic components: first, an asset-specific component involving individual loans that do not share similar risk characteristics with other loans and the measurement of expected credit losses for such individual loans and; second, a pooled component for estimated expected credit losses for loans that share similar risk characteristics.

Loans that do not share risk characteristics with other loans

Loans that do not share risk characteristics with other loans are evaluated on an individual basis. Loans evaluated individually are not included in the collective evaluation. These loans consist of loans with unique features or loans that no longer share risk characteristics with other pooled loans. The process for determining whether a loan should be evaluated on an individual basis begins with determination of credit rating. With the exception of residential loans, all accruing loans graded substandard or worse with a total commitment of $1.0 million or more are assigned a reserve based on an individual evaluation. For these loans, the allowance is based primarily on the fair value of the underlying collateral, utilizing independent third-party appraisals.

Loans that share similar risk characteristics with other loans

In estimating the component of the allowance for credit losses for loans that share similar risk characteristics with other loans, such loans are segregated into loan segments. The Company's primary portfolio segments align with the methodology applied in estimating the allowance for credit losses under CECL. Loans are designated into loan segments based on loans pooled by product types, business lines, and similar risk characteristics or areas of risk concentration.

In determining the allowance for credit losses, the Company derives an estimate of expected credit losses primarily using an expected loss methodology that incorporates risk parameters (probability of default, loss given default, and exposure at default), which are derived from various vendor models, internally-developed statistical models, or non-statistical estimation approaches. Probability of default is projected in these models or estimation approaches using a single economic scenario and were developed to incorporate relevant information about past events, current conditions, and reasonable and supportable forecasts. With the exception of the Company's residential loan segment, the Company's PD models share a common definition of default, which include loans that are 90 days past due, on nonaccrual status, have a charge-off, or obligor bankruptcy. Input reversion is used for all loan segment models, except for the commercial and industrial and CRE, owner-occupied loan segments. Output reversion is used for the commercial and industrial and CRE, owner-occupied loan segments by incorporating, after the forecast period, a one-year linear reversion to the long-term reversion rate in year three through the remaining life of the loans within the respective segments. LGDs are typically derived from the Company's historical loss experience. However, for the residential, warehouse lending, and municipal and nonprofit loan segments, where the Company has either zero (or near zero) losses, or has a limited loss history through the last economic downturn, certain non-modeled methodologies are employed to estimate LGD. Factors utilized in calculating average LGD vary for each loan segment and are further described below. Exposure at default refers to the Company's exposure to loss at the time of borrower default. For revolving lines of credit, the Company incorporates an expectation of increased line utilization for a higher EAD on defaulted loans based on historical experience. For term loans, EAD is calculated using an amortization schedule based on contractual loan terms, adjusted for a prepayment rate assumption. Prepayment trends are sensitive to interest rates and the macroeconomic environment. Fixed rate loans are more influenced by interest rates, whereas variable rate loans are more influenced by the macroeconomic environment. After the quantitative expected loss estimates are calculated, management then adjusts these estimates to incorporate considerations of current trends and conditions that are not captured in the quantitative loss estimates, through the use of qualitative and/or environmental factors.

The following provides credit quality indicators and risk elements most relevant in monitoring and measuring the allowance for credit losses on loans for each of the loan portfolio segments identified:

Warehouse lending

The warehouse lending portfolio segment consists of mortgage warehouse lines, MSR financing facilities, and note finance loans, which have a monitored borrowing base to mortgage companies and similar lenders and are primarily structured as commercial and industrial loans. The collateral for these loans is primarily comprised of residential whole loans and MSRs, with the borrowing base of these loans tightly monitored and controlled by the Company. The primary support for these loans takes the form of pledged collateral, with secondary support provided by the capacity of the financial institution. The collateral-driven nature of these loans distinguish them from traditional commercial and industrial loans. These loans are impacted by interest rate shocks, residential lending rates, prepayment assumptions, and general real estate stress. As a result of the unique loan characteristics, limited historical default and loss experience, and the collateral nature of this loan portfolio segment, the Company uses a non-modeled approach to estimate expected credit losses, leveraging grade information, grade migration history, and management judgment.

Municipal and nonprofit

The municipal and nonprofit portfolio segment consists of loans to local governments, government-operated utilities, special assessment districts, hospitals, schools and other nonprofits. These loans are generally, but not exclusively, entered into for the purpose of financing real estate investment or for refinancing existing debt and are primarily structured as commercial and industrial loans. Loans are supported by taxes or utility fees, and in some cases tax liens on real estate, operating revenue of the institution, or other collateral support the loans. While unemployment rates and the market valuation of residential properties have an effect on the tax revenues supporting these loans, these loans tend to be less cyclical in comparison to similar commercial loans due to reliance on diversified tax bases. The Company uses a non-modeled approach to estimate expected credit losses for this portfolio segment, leveraging grade information and historical municipal default rates.

Tech & innovation

The tech & innovation portfolio segment is comprised of commercial loans that are originated within this business line and are not collateralized by real estate. The source of repayment of these loans is generally expected to be the income that is generated from the business. Expected credit losses for this loan segment are estimated using both a vendor model and an internally-developed model. These models incorporate market level and company-specific factors such as financial statement variables, adjusted for the current stage of the credit cycle and for the Company's loan performance data such as delinquency, utilization, maturity, and size of the loan commitment under specific macroeconomic scenarios to produce a probability of default. Macroeconomic variables include the Dow Jones Index, credit spread between the BBB Bond Yield and 10-Year Treasury Bond Yield, unemployment rate, and CBOE VIX Index quarterly high. LGD and the prepayment rate assumption for EAD for this loan segment are driven by unemployment levels.

Equity fund resources

The equity fund resources portfolio segment is comprised of commercial loans to private equity and venture capital funds. The primary source of repayment of these loans is typically uncalled capital commitments from institutional investors and high net worth individuals. The Company uses a non-modeled approach to estimate expected credit losses for this portfolio segment, leveraging loan grade information.

Other commercial and industrial

The other commercial and industrial segment is comprised of commercial and industrial loans that are not originated within the Company's specialty business lines and are not collateralized by real estate. The models used to estimate expected credit losses for this loan segment are the same as those used for the tech & innovation portfolio segment.

Commercial real estate, owner-occupied

The CRE, owner-occupied portfolio segment is comprised of commercial loans that are collateralized by real estate, where the borrower has a business that occupies the property. These loans are typically entered into for the purpose of providing real estate finance or improvement. The primary source of repayment of these loans is the income generated by the business and where rental or sale of the property may provide secondary support for the loan. These loans are sensitive to general economic conditions as well as the market valuation of CRE properties. The probability of default estimate for this loan segment is modeled using the same model as the commercial and industrial loan segment. LGD for this loan segment is driven by property appreciation and the prepayment rate assumption for EAD is driven by unemployment levels.

Hotel franchise finance

The hotel franchise finance segment is comprised of loans that are originated within this business line and are collateralized by real estate, where the owner is not the primary tenant. These loans are typically entered into for the purpose of financing or the improvement of commercial investment properties. The primary source of repayment of these loans are the rents paid by tenants and where the sale of the property may provide secondary support for the loan. These loans are sensitive to the market valuation of CRE properties, rental rates, and general economic conditions. The vendor model used to estimate expected credit losses for this loan segment projects probabilities of default and exposure at default based on multiple macroeconomic scenarios by modeling how macroeconomic conditions affect the commercial real estate market. Real estate market factors utilized in this model include vacancy rate, rental growth rate, net operating income growth rate, and commercial property price changes for each specific property type. The model then incorporates loan and property-level characteristics including debt coverage, leverage, collateral size, seasoning, and property type. LGD for this loan segment is derived from a non-modeled approach that is driven by property appreciation and the prepayment rate assumption for EAD is driven by the property appreciation for fixed rate loans and unemployment levels for variable rate loans.

Other commercial real estate, non-owner occupied

The other commercial real estate, non-owner occupied segment is comprised of loans that are collateralized by real estate, where the owner is not the primary tenant but are not originated within the Company's specialty business lines. The model used to estimate expected credit losses for this loan segment is the same as the model used for the hotel franchise finance portfolio segment.

Residential

The residential loan portfolio segment is comprised of loans collateralized primarily by first liens on 1-4 residential family properties and home equity lines of credit that are collateralized by either first liens or junior liens on residential properties. The primary source of repayment of these loans is the value of the property and the capacity of the owner to make payments on the loan. Unemployment rates and the market valuation of residential properties will impact the ultimate repayment of these loans. The residential mortgage loan model is a vendor model that projects probability of default, loss given default severity, prepayment rate, and exposure at default to calculate expected losses. The model is intended to capture the borrower's payment behavior during the lifetime of the residential loan by incorporating loan level characteristics such as loan type, coupon, age, loan-to-value, and credit score and economic conditions such as Home Price Index, interest rate, and unemployment rate. A default event for residential loans is defined as 60 days or more past due, with property appreciation as the driver for LGD results. The prepayment rate assumption for exposure at default for residential loans is based on industry prepayment history.

Probability of default for HELOCs is derived from an internally-developed model that projects PD by incorporating loan level information such as delinquency status, loan term, and FICO score and macroeconomic conditions such as property appreciation. LGD for this loan segment is driven by property appreciation and lien position. Exposure at default for HELOCs is calculated based on utilization rate assumptions using a non-modeled approach and also incorporates management judgment.

Construction and land development

The construction and land portfolio segment is comprised of loans collateralized by land or real estate, which are entered into for the purpose of real estate development. The primary source of repayment of these loans is the eventual sale or refinance of the completed project and where claims on the property provide secondary support for the loan. These loans are impacted by the market valuation of CRE and residential properties and general economic conditions that have a higher sensitivity to real estate markets compared to other real estate loans. Default risk of a property is driven by loan-specific drivers, including loan-to-value, maturity, origination date, and the MSA in which the property is located, among other items. The variables used in the internally-developed model include loan level drivers such as origination loan-to-value, loan maturity, and macroeconomic drivers such as property appreciation, MSA level unemployment rate, and national GDP growth. LGD for this loan segment is driven by property appreciation. The prepayment rate assumption for EAD is driven by the property appreciation for fixed rate loans and unemployment levels for variable rate loans.

Other

The other portfolio consists of loans not already captured in one of the aforementioned loan portfolio segments, which include, but may not be limited to, overdraft lines for treasury services, credit cards, consumer loans not collateralized by real estate, and small business loans collateralized by residential real estate. The consumer and small business loans are supported by the capacity of the borrower and the valuation of any collateral. General economic factors such as unemployment will have an effect on these loans. The Company uses a non-modeled approach to estimate expected credit losses, leveraging average historical default rates. LGD for this loan segment is driven by unemployment levels and lien position. The prepayment rate assumption for EAD is driven by the BBB corporate spread for fixed rate loans and unemployment levels for variable rate loans.

Off-balance sheet credit exposures, including unfunded loan commitments

The Company maintains a separate allowance for credit losses on off-balance-sheet credit exposures, including unfunded loan commitments, financial guarantees, and letters of credit, which is classified in Other liabilities on the Consolidated Balance Sheet. The allowance for credit losses on off-balance sheet credit exposures is adjusted through increases or decreases to the provision for credit loss expense. The estimate includes consideration of the likelihood that funding will occur, an estimate of exposure at default that is derived from utilization rate assumptions using a non-modeled approach, and PD and LGD estimates that are derived from the same models and approaches for the Company's other loan portfolio segments described in the Allowance for credit losses on HFI loans section within this note as these unfunded commitments share similar risk characteristics with these loan portfolio segments. The Company does not record a credit loss estimate for off-balance sheet credit exposures that are unconditionally cancellable by the Company or for undrawn amounts under such arrangements that may be drawn prior to the cancellation of the arrangement.

Mortgage servicing rights

The Company acquired MSRs as part of the AmeriHome acquisition and continues to generate new MSRs from its mortgage banking business. When the Company sells mortgage loans in the secondary market and retains the right to service these loans, a servicing right asset is capitalized at the time of sale when the benefits of servicing are deemed to be greater than adequate compensation for performing the servicing activities. MSRs represent the then-current fair value of future net cash flows expected to be realized from performing servicing activities. The Company has elected to subsequently measure MSRs at fair value and report changes in fair value in current period income as a component of Net loan servicing revenue in the Consolidated Income Statement.

The Company may in the ordinary course of business sell MSRs and will recognize, as of the trade date, a gain or loss on the sale equal to the difference between the carrying value of the transferred MSRs and the value of the assets received as consideration. The Company subsequently derecognizes MSRs when substantially all of the risks and rewards of ownership are irrevocably passed to the transferee and any protection provisions retained by the Company are minor and can be reasonably estimated, which typically occurs on the settlement date. Protection provisions are considered to be minor if the obligation created by such provisions is estimated to be no more than 10 percent of the sales price and the Company retains the risk of prepayment for no more than 120 days. The Company records an estimated liability for retained protection provisions as of the trade date and continues to remeasure this liability until settlement, with any changes in the estimated liability recorded in earnings. In addition, fees to transfer loans associated with the sold MSRs to a new servicer are also recorded on the settlement date. Gains or losses on sales of MSRs, net of retained protection provisions, and transfer fees are included in Net loan servicing revenue in the Consolidated Income Statement.

Leases (lessee)

At inception, contracts are evaluated to determine whether the contract constitutes a lease agreement. For contracts that are determined to be an operating lease, a corresponding ROU asset and operating lease liability are recorded in separate line items on the Consolidated Balance Sheet. A ROU asset represents the Company’s right to use an underlying asset during the lease term and a lease liability represents the Company’s commitment to make contractually obligated lease payments. Operating lease ROU assets and liabilities are recognized at the commencement date of the lease and are based on the present value of lease payments over the lease term. The measurement of the operating lease ROU asset includes any lease payments made and is reduced by lease incentives that are paid or are payable to the Company. Variable lease payments that depend on an index or rate such as the Consumer Price Index are included in lease payments based on the rate in effect at the commencement date of the lease. Lease payments are recognized on a straight-line basis over the lease term as part of Occupancy expense in the Consolidated Income Statements.

As the rate implicit in the lease is not readily determinable, the Company's incremental collateralized borrowing rate is used to determine the present value of lease payments. This rate gives consideration to the applicable FHLB collateralized borrowing rates and is based on the information available at the commencement date. The Company has elected to apply the short-term lease measurement and recognition exemption to leases with an initial term of 12 months or less; therefore, these leases are not recorded on the Company’s Consolidated Balance Sheet, but rather, lease expense is recognized over the lease term on a straight-line basis. The Company’s lease agreements may include options to extend or terminate the lease. These options are included in the lease term when it is reasonably certain that the options will be exercised.

The Company also made an accounting policy election to not separate non-lease components from the associated lease component, and instead account for them together as part of the applicable lease component. The majority of the Company’s non-lease components such as common area maintenance, parking, and taxes are variable, and are expensed as incurred. Variable payment amounts are determined in arrears by the landlord depending on actual costs incurred.

Goodwill and other intangible assets

The Company records as goodwill the excess of the purchase price in a business combination over the fair value of the identifiable net assets acquired in accordance with applicable guidance. The Company performs its annual goodwill and intangibles impairment tests as of October 1 each year, or more often if events or circumstances indicate that the carrying value may not be recoverable. The Company can first elect to assess, through qualitative factors, whether it is more likely than not that goodwill is impaired. If the qualitative assessment indicates potential impairment, a quantitative impairment test is performed. If, based on the quantitative test, a reporting unit's carrying amount exceeds its fair value, a goodwill impairment charge for this difference is recorded to current period earnings as part of non-interest expense.

The Company’s intangible assets consist of correspondent relationships, operating licenses, tradenames, core deposit intangibles, customer relationships, and developed technology assets that are being amortized over periods of five to 40 years, with the exception of the Bridge Bank tradename which has an indefinite life. See "Note 2. Mergers, Acquisitions and

Dispositions" of these Notes to Unaudited Consolidated Financial Statements for discussion of the intangible assets acquired as part of the AmeriHome and Digital Disbursements acquisitions.

The Company considers the remaining useful lives of its intangible assets each reporting period, as required by ASC 350, Intangibles—Goodwill and Other, to determine whether events and circumstances warrant a revision to the remaining period of amortization. If the estimate of an intangible asset’s remaining useful life has changed, the remaining carrying amount of the intangible asset is amortized prospectively over the revised remaining useful life. The Company has not revised its estimates of the useful lives of its intangible assets during the three months ended March 31, 2022 or 2021.

Stock compensation plans

The Company has an incentive plan that gives the BOD the authority to grant stock awards, consisting of unrestricted stock, stock units, dividend equivalent rights, stock options (incentive and non-qualified), stock appreciation rights, restricted stock, and performance and annual incentive awards. Compensation expense on non-vested restricted stock awards is based on the fair value of the award on the measurement date which, for the Company, is the date of the grant and is recognized ratably over the service period of the award. Forfeitures are estimated at the time of the award grant and revised in subsequent periods if actual forfeitures differ from those estimates. The fair value of non-vested restricted stock awards is the market price of the Company’s stock on the date of grant.

The Company's performance stock units have a cumulative EPS target and a TSR performance measure component. The TSR component is a market-based performance condition that is separately valued as of the date of the grant. A Monte Carlo valuation model is used to determine the fair value of the TSR performance metric, which simulates potential TSR outcomes over the performance period and determines the payouts that would occur in each scenario. The resulting fair value of the TSR component is based on the average of these results. Compensation expense related to the TSR component is based on the fair value determination on the date of the grant and is not subsequently revised based on actual performance. Compensation expense related to the EPS component for these awards is based on the fair value (market price of the Company's stock on the date of the grant) of the award. Compensation expense related to both the TSR and EPS components is recognized ratably over the service period of the award.

See "Note 9. Stockholders' Equity" of these Notes to Unaudited Consolidated Financial Statements for further discussion of stock awards.

Dividends

WAL is a legal entity separate and distinct from its subsidiaries. As a holding company with limited significant assets other than the capital stock of its subsidiaries, WAL's ability to pay dividends depends primarily upon the receipt of dividends or other capital distributions from its subsidiaries. The Company's subsidiaries' ability to pay dividends to WAL is subject to, among other things, their individual earnings, financial condition, and need for funds, as well as federal and state governmental policies and regulations applicable to WAL and each of those subsidiaries, which limit the amount that may be paid as dividends without prior approval. In addition, the terms and conditions of other securities the Company issues may restrict its ability to pay dividends to holders of the Company's common stock. For example, if any required payments on outstanding trust preferred securities are not made, WAL would be prohibited from paying cash dividends on its common stock.

Preferred stock

On September 22, 2021, the Company issued an aggregate of 12,000,000 depositary shares, 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). The Company's Series A preferred stock is perpetual preferred stock that is not subject to any mandatory redemption, resulting in classification as permanent equity. Dividends on preferred stock are recognized on the declaration date and are recorded as a reduction of retained earnings.

Treasury shares

The Company separately presents treasury shares, which 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. Treasury shares are carried at cost.

Sales of common stock under ATM program

The Company has a distribution agency agreement with J.P. Morgan Securities LLC and Piper Sandler & Co., under which the Company may sell up to 6,132,670 shares of its common stock on the NYSE. The Company pays the distribution agents a mutually agreed rate, not to exceed 2% of the gross offering proceeds of the shares sold pursuant to the distribution agency agreement. The common stock is sold at prevailing market prices at the time of the sale or at negotiated prices and, as a result, prices will vary. Any 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). See "Note 9. Stockholders' Equity" of these Notes to Unaudited Consolidated Financial Statements for further discussion of this program.

Derivative financial instruments

The Company uses interest rate swaps to mitigate interest-rate risk associated with changes to the fair value of certain fixed-rate financial instruments (fair value hedges).

The Company recognizes derivatives as assets or liabilities on the Consolidated Balance Sheet at their fair value in accordance with ASC 815, Derivatives and Hedging. The accounting for changes in the fair value of a derivative instrument depends on whether it has been designated and qualifies as part of a hedging relationship and further, on the type of hedging relationship. Derivative instruments designated in a hedge relationship to mitigate exposure to changes in the fair value of an asset or liability attributable to a particular risk, such as interest rate risk, are considered fair value hedges.

The Company documents its hedge relationships, including identification of the hedging instruments and the hedged items, as well as its risk management objectives and strategies for undertaking the hedge transaction after the derivative contract is executed. At inception, the Company performs a quantitative assessment to determine whether the derivatives used in hedging transactions are highly effective (as defined in the guidance) in offsetting changes in the fair value of the hedged item. Retroactive effectiveness is assessed, as well as the continued expectation that the hedge will remain effective prospectively. After the initial quantitative assessment is performed, on a quarterly basis, the Company performs a qualitative hedge effectiveness assessment. This assessment takes into consideration any adverse developments related to the counterparty's risk of default and any negative events or circumstances that affect the factors that originally enabled the Company to assess that it could reasonably support, qualitatively, an expectation that the hedging relationship was and will continue to be highly effective. The Company discontinues hedge accounting prospectively when it is determined that a hedge is no longer highly effective. When hedge accounting is discontinued on a fair value hedge that no longer qualifies as an effective hedge, the derivative instrument continues to be reported at fair value on the Consolidated Balance Sheet, but the carrying amount of the hedged item is no longer adjusted for future changes in fair value. The adjustment to the carrying amount of the hedged item that existed at the date hedge accounting is discontinued is amortized over the remaining life of the hedged item into earnings.

Changes in the fair value of a derivative that is designated and qualifies as a fair value hedge, along with changes in the fair value of the hedged asset or liability that are attributable to the hedged risk, are recorded in the same line item as the offsetting loss or gain on the related interest rate swaps during the period of change. For loans, the gain or loss on the hedged item is included in interest income and for subordinated debt, the gain or loss on the hedged items is included in interest expense.

Derivative instruments that are not designated as hedges, so called free-standing derivatives, are reported on the Consolidated Balance Sheet at fair value and the changes in fair value are recognized in earnings as non-interest income during the period of change. With the acquisition of AmeriHome, the Company's economic hedging volume has substantially increased. The Company enters into commitments to purchase mortgage loans that will be held for sale. These loan commitments, described as IRLCs, qualify as derivative instruments, except those that are originated rather than purchased, and intended for HFI classification. As of March 31, 2022, all IRLCs qualify as derivative instruments. Changes in fair value associated with changes in interest rates are economically hedged by utilizing forward sale commitments and interest rate futures. These hedging instruments are typically entered into contemporaneously with IRLCs. Loans that have been or will be purchased or originated may be used to satisfy the Company's forward sale commitments. In addition, derivative financial instruments are also used to economically hedge the Company's MSR portfolio. Changes in the fair value of derivative financial instruments that hedge IRLCs and loans HFS are included in Net gain on loan origination and sale activities in the Consolidated Income Statement. Changes in the fair value of derivative financial instruments that hedge MSRs are included in Net loan servicing revenue in the Consolidated Income Statement.

The Company may in the normal course of business purchase a financial instrument or originate a loan that contains an embedded derivative instrument. Upon purchasing the instrument or originating the loan, the Company assesses whether the economic characteristics of the embedded derivative are clearly and closely related to the economic characteristics of the remaining component of the financial instrument (i.e., the host contract) and whether a separate instrument with the same terms as the embedded instrument would meet the definition of a derivative instrument. When it is determined that the embedded

derivative possesses economic characteristics that are not clearly and closely related to the economic characteristics of the host contract and a separate instrument with the same terms would qualify as a derivative instrument, the embedded derivative is separated from the host contract and carried at fair value. However, in cases where the host contract is measured at fair value, with changes in fair value reported in current earnings, or the Company is unable to reliably identify and measure an embedded derivative for separation from its host contract, the entire contract is carried on the Consolidated Balance Sheet at fair value and is not designated as a hedging instrument.

Off-balance sheet instruments

In the ordinary course of business, the Company enters into off-balance sheet financial instrument arrangements consisting of commitments to extend credit and standby letters of credit. Such financial instruments are recorded in the Consolidated Balance Sheets when funded. These off-balance sheet financial instruments impact, to varying degrees, elements of credit risk in excess of amounts recognized on the Consolidated Balance Sheet. Losses could be experienced when the Company is contractually obligated to make a payment under these instruments and must seek repayment from the borrower, which may not be as financially sound in the current period as they were when the commitment was originally made. Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract and, in certain instances, may be unconditionally cancelable. 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 also has off-balance sheet arrangements related to its derivative instruments. Derivative instruments are recognized in the Consolidated Balance Sheets at fair value and their notional values are carried off-balance sheet. See "Note 11. Derivatives and Hedging Activities" of these Notes to Unaudited Consolidated Financial Statements for further discussion.

Fair values of financial instruments

The Company uses fair value measurements to record fair value adjustments to certain assets and liabilities. ASC 820, Fair Value Measurement, establishes a framework for measuring fair value and a three-level valuation hierarchy for disclosure of fair value measurement, and also sets forth disclosure requirements for fair value measurements. The valuation hierarchy is based upon the transparency of inputs to the valuation of an asset or liability as of the measurement date. The Company uses various valuation approaches, including market, income, and/or cost approaches. ASC 820 establishes a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that observable inputs be used when available. Observable inputs are inputs that market participants would use in pricing the asset or liability and are developed based on market data obtained from sources independent of the Company. Unobservable inputs are inputs that reflect the Company’s assumptions about the factors market participants would consider in pricing the asset or liability and are developed based on the best information available in the circumstances. The hierarchy is broken down into three levels based on the reliability of inputs, as follows:

•Level 1 - Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities.

•Level 2 - Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. These might include quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (such as interest rates, prepayment speeds, volatilities, etc.) or model-based valuation techniques where all significant assumptions are observable, either directly or indirectly, in the market.

•Level 3 - Valuation is generated from model-based techniques where one or more significant inputs are not observable, either directly or indirectly, in the market. These unobservable assumptions reflect the Company’s own estimates of assumptions that market participants would use in pricing the asset or liability. Valuation techniques may include use of matrix pricing, discounted cash flow models, and similar techniques.

The availability of observable inputs varies based on the nature of the specific financial instrument. To the extent that valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires more judgment. Accordingly, the degree of judgment exercised by the Company in determining fair value is greatest for instruments categorized in Level 3. In certain cases, the inputs used to measure fair value may fall into different levels of the

fair value hierarchy. For disclosure purposes, the lowest level input that is significant to the fair value measurement determines the level in the fair value hierarchy within which the fair value measurement falls in its entirety.

Fair value is a market-based measure considered from the perspective of a market participant who may purchase the asset or assume the liability, rather than an entity-specific measure. When market assumptions are available, ASC 820 requires that the Company consider the assumptions that market participants would use to estimate the fair value of the financial instrument at the measurement date.

ASC 825, Financial Instruments, requires disclosure of fair value information about financial instruments, whether or not recognized in the balance sheet, for which it is practicable to estimate that value.

Management uses its best judgment in estimating the fair value of the Company’s financial instruments; however, there are inherent limitations in any estimation technique. Therefore, for substantially all financial instruments, the fair value estimates presented herein are not necessarily indicative of the amounts the Company could have realized in a sales transaction at March 31, 2022 and December 31, 2021. The estimated fair value amounts for March 31, 2022 and December 31, 2021 have been measured as of period-end, and have not been re-evaluated or updated for purposes of these Unaudited Consolidated Financial Statements subsequent to those dates. As such, the estimated fair values of these financial instruments subsequent to the reporting date may be different than the amounts reported at period-end.

The information in "Note 15. Fair Value Accounting" of these Notes to Unaudited Consolidated Financial Statements should not be interpreted as an estimate of the fair value of the entire Company since a fair value calculation is only required for a limited portion of the Company’s assets and liabilities.

Due to the wide range of valuation techniques and the degree of subjectivity used in making the estimate, comparisons between the Company’s disclosures and those of other companies or banks may not be meaningful.

The following methods and assumptions were used by the Company in estimating the fair value of its financial instruments:

Cash, cash equivalents, and restricted cash

The carrying amounts reported on the Consolidated Balance Sheet for cash and due from banks approximate their fair value.

Investment securities

The fair values of U.S. treasury and certain other debt securities as well as publicly-traded CRA investments and exchange-listed preferred stock are based on quoted market prices and are categorized as Level 1 in the fair value hierarchy.

The fair values of debt securities are primarily determined based on matrix pricing. Matrix pricing is a mathematical technique that utilizes observable market inputs including, yield curves, credit ratings, and prepayment speeds. Fair values determined using matrix pricing are generally categorized as Level 2 in the fair value hierarchy. In addition to matrix pricing, the Company uses other pricing sources, including observed prices on publicly traded securities and dealer quotes, to estimate the fair value of debt securities, which are also categorized as Level 2 in the fair value hierarchy.

Restricted stock

Restricted stock consists of investments in the capital stock of the FRB and the FHLB. As no ready market exists for them, and they have no quoted market value, the fair values of these investments have been categorized as Level 2 in the fair value hierarchy.

Loans HFS

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

The fair value of non-agency loans HFS as well as certain loans that become nonsalable into active markets due to the identification of a defect is determined based on valuation techniques that utilize Level 3 inputs.

Loans HFI

The fair value of loans is estimated based on discounted cash flows using interest rates currently being offered for loans with similar terms to borrowers with similar credit quality and adjustments that the Company believes a market participant would consider in determining fair value based on a third-party independent valuation. As a result, the fair value for loans is categorized as Level 3 in the fair value hierarchy.

Mortgage servicing rights

The fair value of MSRs is estimated using a discounted cash flow model that incorporates assumptions that a market participant would use in estimating the fair value of servicing rights, including, but not limited to, option adjusted spread, conditional prepayment rate, servicing fee rate, and cost to service. As a result, the fair value for MSRs is categorized as Level 3 in the fair value hierarchy.

Accrued interest receivable and payable

The carrying amounts reported on the Consolidated Balance Sheet for accrued interest receivable and payable approximate their fair values.

Derivative financial instruments

All derivatives are recognized on the Consolidated Balance Sheets at fair value. The valuation methodologies used to estimate the fair value of derivative instruments varies by type. Treasury futures and options, Eurodollar futures, and swap futures are measured based on valuation techniques using Level 1 Inputs from exchange-provided daily settlement quotes. Interest rate swaps and forward purchase and sales contracts are measured based on valuation techniques using Level 2 inputs, such as quoted market price, contracted selling price, or market price equivalent. 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 the pull-through rate. The pull-through rate and servicing fee multiple are unobservable inputs based on historical experience.

Deposits

The fair value disclosed for demand and savings deposits is by definition equal to the amount payable on demand at the reporting date (that is, their carrying amount), as these deposits do not have a contractual term. The carrying amount for variable rate deposit accounts approximates their fair value. Fair values for fixed rate certificates of deposit are estimated using a discounted cash flow calculation that applies interest rates currently being offered on certificates to a schedule of aggregated expected monthly maturities on these deposits. The fair value measurement of deposit liabilities is categorized as Level 2 in the fair value hierarchy.

FHLB advances and customer repurchase agreements

The fair values of the Company’s borrowings are estimated using discounted cash flow analyses, based on the market rates for similar types of borrowing arrangements. The carrying value of FHLB advances and customer repurchase agreements approximate their fair values due to their short durations and have been categorized as Level 2 in the fair value hierarchy.

Credit linked notes

The fair value of credit linked notes is based on observable inputs, when available, and as such credit linked notes are categorized as Level 2 liabilities. Because the notes are variable rate debt, the fair value approximates carrying value.

Subordinated debt

The fair value of subordinated debt is based on the market rate for the respective subordinated debt security. Subordinated debt has been categorized as Level 2 in the fair value hierarchy.

Junior subordinated debt

Junior subordinated debt is valued based on a discounted cash flow model which uses the Treasury Bond rates and the 'BB' and 'BBB' rated financial indexes as inputs. Junior subordinated debt has been categorized as Level 3 in the fair value hierarchy.

Income taxes

The Company is subject to income taxes in the United States and files a consolidated federal income tax return with all of its subsidiaries, with the exception of BW Real Estate, Inc. Deferred income taxes are recorded to reflect the effects of temporary differences between the financial reporting carrying amounts of assets and liabilities and their income tax bases using enacted tax rates that are expected to be in effect when the taxes are actually paid or recovered. As changes in tax laws or rates are enacted, deferred tax assets and liabilities are adjusted through the provision for income taxes.

Net deferred tax assets are recorded to the extent that these assets will more-likely-than-not be realized. In making these determinations, all available positive and negative evidence is considered, including scheduled reversals of deferred tax liabilities, tax planning strategies, projected future taxable income, and recent operating results. If it is determined that deferred income tax assets to be realized in the future are in excess of their net recorded amount, an adjustment to the valuation allowance will be recorded, which will reduce the Company's provision for income taxes.

A tax benefit from an unrecognized tax benefit may be recognized when it is more-likely-than-not that the position will be sustained upon examination, including related appeals or litigation, based on technical merits. Income tax benefits must meet a more-likely-than-not recognition threshold at the effective date to be recognized.

Interest and penalties related to unrecognized tax benefits are recognized as part of the provision for income taxes in the Consolidated Income Statement. Accrued interest and penalties are included in the related tax liability line with other liabilities on the Consolidated Balance Sheet. See "Note 13. Income Taxes" of these Notes to Unaudited Consolidated Financial Statements for further discussion on income taxes.

Non-interest income

Non-interest income includes revenue associated with mortgage banking and commercial banking activities, investment securities, equity investments, and bank owned life insurance. These non-interest income streams are primarily generated by different types of financial instruments, held by the Company for which there is specific accounting guidance and therefore, are not within the scope of ASC 606, Revenue from Contracts with Customers.

Non-interest income amounts within the scope of ASC 606 include service charges and fees, success fees related to equity investments, debit and credit card interchange fees, and legal settlement services fees. Service charges and fees consist of fees earned from performance of account analysis, general account services, and other deposit account services. These fees are recognized as the related services are provided. Success fees are one-time fees detailed as part of certain loan agreements and are earned immediately upon occurrence of a triggering event. Card income includes fees earned from customer use of debit and credit cards, interchange income from merchants, and international charges. Card income is generally within the scope of ASC 310, Receivables; however, certain processing transactions for merchants, such as interchange fees, are within the scope of ASC 606. The Company generally receives payment for its services during the period or at the time services are provided and, therefore, does not have material contract asset or liability balances at period end. Legal settlement service fees relate to payment services provided for the distribution of funds from legal settlements and are recognized upon transfer of funds to a claimant. See "Note 17. Revenue from Contracts with Customers" of these Notes to Unaudited Consolidated Financial Statements for further details related to the nature and timing of revenue recognition for non-interest income revenue streams within the scope of this standard.

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Business Combinations

3 Months Ended

Mar. 31, 2022

Business Combinations [Abstract]

Mergers, Acquisitions and Dispositions Disclosures

2. MERGERS, ACQUISITIONS AND DISPOSITIONS

Acquisition of Digital Disbursements

On January 25, 2022, the Company completed its acquisition of Digital Settlement Technologies LLC, doing business as Digital Disbursements, a digital payments platform for the class action legal industry. The acquisition of DST is expected to extend the Company's digital payment efforts by providing a digital payments platform for the class action market and broader legal industry.

This transaction was accounted for as a business combination under the acquisition method of accounting. Assets purchased and liabilities assumed were recorded at their respective acquisition date estimated fair values. During the measurement period (not to exceed one year from the acquisition date), the fair values of assets acquired and liabilities assumed are subject to adjustment if additional information becomes available to indicate a more accurate or appropriate value for an asset or liability. As the Company is still in the process of reviewing the fair value methodology and assumptions used in the valuation of identifiable intangible assets, the fair values of these intangible assets are considered provisional. The Company is also assessing the value of any associated DTAs, which are also provisional.

Total consideration of $67.8 million, comprised of cash paid at closing of $50.6 million and contingent consideration with an estimated fair value of $17.2 million, was exchanged for all of the issued and outstanding membership interests of DST. The terms of the acquisition include a contingent consideration arrangement that is based on performance for the three year period subsequent to the acquisition. There is no required minimum payment amount or maximum payment amount specified under the terms of the contingent consideration agreement. The fair value of the contingent consideration recognized on the acquisition date was estimated using a discounted cash flow approach, and is considered provisional, as the Company is still in the process of reviewing the fair value methodology and assumptions associated with the contingent consideration.

DST’s results of operations have been included in the Company's results beginning January 25, 2022 and are reported as part of the Consumer Related segment. Acquisition and restructure expenses related to the DST acquisition of $0.4 million for the three months ended March 31, 2022 were included as a component of non-interest expense in the Consolidated Income Statement, all of which are acquisition related costs as defined by ASC 805.

The fair value amounts of identifiable assets acquired and liabilities assumed as part of the DST acquisition are as follows:

	January 25, 2022
	(in millions)
Assets acquired:
Cash and cash equivalents	$	0.6
Identified intangible assets	27.5
Other assets	0.1
Total assets	$	28.2
Liabilities assumed:
Other liabilities	$	0.4
Total liabilities	0.4
Net assets acquired	$	27.8
Consideration paid
Cash	$	50.6
Contingent consideration	17.2
Total consideration	$	67.8
Goodwill	$	40.0

In connection with the acquisition, the Company acquired identifiable intangible assets totaling $27.5 million, as detailed in the table below:

	Acquisition Date Fair Value		Estimated Useful Life
	(in millions)		(in years)
Customer relationships	$	20.9	7
Developed technology	6.2		5
Trade name	0.4		10
Total	$	27.5

Goodwill in the amount of $40.0 million was recognized and is expected to be fully deductible for tax purposes. Goodwill was allocated entirely to the Consumer Related segment and represents the strategic, operational, and financial benefits expected from the acquisition, including expansion of the Company's settlement services offerings, diversification of its revenue sources, and post-acquisition synergies from integrating Digital Disbursements, as well as the value of the acquired workforce.

Acquisition of AmeriHome

On April 7, 2021, the Company completed its acquisition of Aris, the parent company of AmeriHome, and certain other parties, pursuant to which Aris merged with and into an indirect subsidiary of WAB. As a result of the merger, AmeriHome is a wholly-owned indirect subsidiary of the Company and continues to operate as AmeriHome Mortgage, a Western Alliance Bank company. AmeriHome is a leading national business-to-business mortgage acquirer and servicer. The acquisition of AmeriHome complements the Company’s national commercial businesses with a mortgage franchise that allows the Company to expand mortgage-related offerings to existing clients and diversifies the Company’s revenue profile by expanding sources of non-interest income.

Total cash consideration of $1.2 billion was paid in exchange for all of the issued and outstanding membership interests of Aris. AmeriHome's results of operations have been included in the Company's results beginning April 7, 2021 and are reported as part of the Consumer Related segment. There were no acquisition and restructure expenses related to the AmeriHome acquisition that were recognized during the three months ended March 31, 2022. For the three months ended March 31, 2021, the Company recognized $0.4 million in acquisition/restructure expenses related to the AmeriHome acquisition.

This transaction was accounted for as a business combination under the acquisition method of accounting. Assets purchased and liabilities assumed were recorded at their respective acquisition date estimated fair values. During the three months ended March 31, 2022, the Company adjusted its initial provisional estimates based on new information regarding facts and circumstances that existed as of the acquisition date, resulting in a decrease of $1.6 million in other liabilities. This measurement period adjustment did not have a significant impact on the Company's Consolidated Income Statement. As of March 31, 2022, the fair value of all acquired assets and assumed liabilities are considered final.

The fair value amounts of identifiable assets acquired and liabilities assumed as part of the AmeriHome acquisition are as follows:

	April 7, 2021
	(in millions)
Assets acquired:
Cash and cash equivalents	$	207.2
Loans held for sale	3,552.9
Mortgage servicing rights	1,347.0
Premises and equipment, net	11.3
Operating right of use asset	18.9
Identified intangible assets	141.0
Loans eligible for repurchase	2,744.7
Deferred tax asset	6.6
Other assets	236.0
Total assets	$	8,265.6
Liabilities assumed:
Other borrowings	$	3,633.9
Operating lease liability	18.9
Liability for loans eligible for repurchase	2,744.7
Other liabilities	149.5
Total liabilities	6,547.0
Net assets acquired	$	1,718.6
Consideration paid
Cash	$	1,231.6
Elimination of pre-existing debt	686.8
Total consideration	$	1,918.4
Goodwill	$	199.8

In connection with the acquisition, the Company acquired identifiable intangible assets totaling $141.0 million, as detailed in the table below:

	Acquisition Date Fair Value		Estimated Useful Life
	(in millions)		(in years)
Correspondent customer relationships	$	76.0	20
Operating licenses	55.5		40
Trade name	9.5		20
Total	$	141.0

Goodwill in the amount of $199.8 million was recognized and allocated entirely to the Consumer Related segment. Goodwill represents the strategic, operational, and financial benefits expected from the acquisition, including expansion of the Company's mortgage offerings, diversification of its revenue sources, and post-acquisition synergies from integrating AmeriHome’s operating platform, as well as the value of the acquired workforce. Approximately $185.0 million of goodwill is expected to be deductible for tax purposes.

The following table presents pro forma information as if the AmeriHome acquisition was completed on January 1, 2020. The pro forma information includes adjustments for interest income and interest expense on existing loan agreements between WAL and AmeriHome prior to acquisition, the impact of MSR sales contemplated in connection with the acquisition, amortization of intangible assets arising from the acquisition, recognition of stock compensation expense for awards issued to certain AmeriHome executives, transaction costs, and related income tax effects. The pro forma information is not necessarily indicative of the results of operations as they would have been had the transactions been effected on the assumed dates.

	Three Months Ended March 31, 2021
	(in millions)
Interest income	$	353.3
Non-interest income	89.6
Net income	180.2

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Investment Securities

3 Months Ended

Mar. 31, 2022

Investments, Debt and Equity Securities [Abstract]

Investment Securities

d fair values of investment securities at March 31, 2022 and December 31, 2021 are summarized as follows:

	March 31, 2022
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)		Fair Value
	(in millions)
Held-to-maturity
Private label residential MBS	$	211.1	$	—	$	(18.9)	$	192.2
Tax-exempt	949.9		18.2		(20.4)		947.7
Total HTM securities	$	1,161.0	$	18.2	$	(39.3)	$	1,139.9
Available-for-sale debt securities
CLO	$	2,061.3	$	1.2	$	(7.2)	$	2,055.3
Commercial MBS issued by GSEs	64.9		0.1		(2.8)		62.2
Corporate debt securities	424.6		1.7		(11.0)		415.3
Private label residential MBS	1,444.0		0.3		(101.1)		1,343.2
Residential MBS issued by GSEs	2,073.8		0.2		(169.0)		1,905.0
Tax-exempt	1,021.7		8.6		(37.4)		992.9
Other	75.2		9.2		(6.1)		78.3
Total AFS debt securities	$	7,165.5	$	21.3	$	(334.6)	$	6,852.2
Equity securities
CRA investments	$	54.1	$	—	$	(1.8)	$	52.3
Preferred stock	111.0		4.9		(3.5)		112.4
Total equity securities	$	165.1	$	4.9	$	(5.3)	$	164.7

	December 31, 2021
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)		Fair Value
	(in millions)
Held-to-maturity
Private label residential MBS	$	216.9	$	—	$	(1.6)	$	215.3
Tax-exempt	890.2		43.2		(2.3)		931.1
Total HTM securities	$	1,107.1	$	43.2	$	(3.9)	$	1,146.4
Available-for-sale debt securities
CLO	$	926.0	$	0.5	$	(0.3)	$	926.2
Commercial MBS issued by GSEs	68.2		0.9		(0.6)		68.5
Corporate debt securities	382.7		9.2		(9.0)		382.9
Private label residential MBS	1,528.7		3.5		(24.2)		1,508.0
Residential MBS issued by GSEs	2,027.5		7.3		(41.4)		1,993.4
Tax-exempt	1,145.1		71.2		(1.2)		1,215.1
U.S. treasury securities	13.0		—		—		13.0
Other	75.3		11.0		(4.6)		81.7
Total AFS debt securities	$	6,166.5	$	103.6	$	(81.3)	$	6,188.8
Equity securities
CRA investments	$	45.1	$	—	$	(0.5)	$	44.6
Preferred stock	107.1		7.7		(0.9)		113.9
Total equity securities	$	152.2	$	7.7	$	(1.4)	$	158.5

Securities with carrying amounts of approximately $1.9 billion and $2.2 billion at March 31, 2022 and December 31, 2021, respectively, were pledged for various purposes as required or permitted by law.

The following tables summarize the Company's debt securities in an unrealized loss position at March 31, 2022 and December 31, 2021, aggregated by major security type and length of time in a continuous unrealized loss position: 

	March 31, 2022
	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
CLO	$	6.8	$	1,101.8	$	0.4	$	63.2	$	7.2	$	1,165.0
Commercial MBS issued by GSEs	1.2		28.6		1.6		17.1		2.8		45.7
Corporate debt securities	11.0		346.3		—		—		11.0		346.3
Private label residential MBS	68.0		1,015.1		33.1		300.1		101.1		1,315.2
Residential MBS issued by GSEs	77.5		1,148.0		91.5		726.8		169.0		1,874.8
Tax-exempt	37.4		677.2		—		—		37.4		677.2
Other	1.6		15.4		4.5		27.5		6.1		42.9
Total AFS securities	$	203.5	$	4,332.4	$	131.1	$	1,134.7	$	334.6	$	5,467.1

	December 31, 2021
	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
CLO	$	0.3	$	170.7	$	—	$	—	$	0.3	$	170.7
Commercial MBS issued by GSEs	0.6		19.5		—		—		0.6		19.5
Corporate debt securities	9.0		107.0		—		—		9.0		107.0
Private label residential MBS	24.2		1,250.0		—		—		24.2		1,250.0
Residential MBS issued by GSEs	32.6		1,355.7		8.8		142.1		41.4		1,497.8
Tax-exempt	1.2		141.4		—		—		1.2		141.4
Other	—		2.0		4.6		27.4		4.6		29.4
Total AFS securities	$	67.9	$	3,046.3	$	13.4	$	169.5	$	81.3	$	3,215.8

The total number of AFS debt securities in an unrealized loss position at March 31, 2022 is 575, compared to 179 at December 31, 2021.

On a quarterly basis, the Company performs an impairment analysis on its AFS debt securities that are 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

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, are highly rated by major rating agencies, and have a long history of no credit losses. 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 continue to be highly rated, 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 that are 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.

For the Company's private label residential MBS, which consist of non-agency collateralized mortgage obligations that are 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 consists of highly rated securitization tranches, containing pools of medium to large-sized corporate, high yield bank loans. These are variable rate securities that have an investment grade rating of Single-A or better. The Company has increased its investment in these securities over the past year and unrealized losses on these securities are 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.

Based on the qualitative factors noted above and as the Company does not intend to sell these securities and it is more likely than not that the Company will not be required to sell the securities prior to their anticipated recovery, no credit losses have been recognized on these securities during the three months ended March 31, 2022 and 2021. In addition, as of March 31, 2022 and December 31, 2021, no allowance for credit losses on the Company's AFS securities has been recognized.

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 allowance for credit losses on the Company's HTM debt securities:

	Three Months Ended March 31, 2022
	Balance, December 31, 2021		Recovery of Credit Losses		Write-offs		Recoveries		Balance, March 31, 2022
	(in millions)
Held-to-maturity debt securities
Tax-exempt	$	5.2	$	(2.0)	$	—	$	—	$	3.2

	Three Months Ended March 31, 2021:
	Balance, December 31, 2020		Provision for Credit Losses		Write-offs		Recoveries		Balance March 31, 2021
	(in millions)
Held-to-maturity debt securities
Tax-exempt	$	6.8	$	2.4	$	—	$	—	$	9.2

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 $3.3 million and $3.0 million at March 31, 2022 and December 31, 2021, respectively, and is excluded from the estimate of expected credit losses.

The following tables summarize the carrying amount of the Company’s investment ratings position as of March 31, 2022 and December 31, 2021, which are updated quarterly and used to monitor the credit quality of the Company's securities: 

	March 31, 2022
	AAA		Split-rated AAA/AA+		AA+ to AA-		A+ to A-		BBB+ to BBB-		BB+ and below		Unrated		Totals
	(in millions)
Held-to-maturity
Private label residential MBS	$	—	$	—	$	—	$	—	$	—	$	—	$	211.1	$	211.1
Tax-exempt	—		—		—		—		—		—		949.9		949.9
Total HTM securities (1)	$	—	$	—	$	—	$	—	$	—	$	—	$	1,161.0	$	1,161.0
Available-for-sale debt securities
CLO	$	123.5	$	—	$	1,676.1	$	255.7	$	—	$	—	$	—	$	2,055.3
Commercial MBS issued by GSEs	—		62.2		—		—		—		—		—		62.2
Corporate debt securities	—		—		—		48.0		367.3		—		—		415.3
Private label residential MBS	1,261.3		—		81.0		—		0.8		—		0.1		1,343.2
Residential MBS issued by GSEs	—		1,905.0		—		—		—		—		—		1,905.0
Tax-exempt	17.7		16.6		443.3		482.3		—		—		33.0		992.9
Other	—		—		10.8		9.8		30.1		8.5		19.1		78.3
Total AFS securities (1)	$	1,402.5	$	1,983.8	$	2,211.2	$	795.8	$	398.2	$	8.5	$	52.2	$	6,852.2
Equity securities
CRA investments	$	—	$	26.2	$	—	$	—	$	—	$	—	$	26.1	$	52.3
Preferred stock	—		—		—		—		78.0		19.2		15.2		112.4
Total equity securities (1)	$	—	$	26.2	$	—	$	—	$	78.0	$	19.2	$	41.3	$	164.7

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

	December 31, 2021
	AAA		Split-rated AAA/AA+		AA+ to AA-		A+ to A-		BBB+ to BBB-		BB+ and below		Unrated		Totals
	(in millions)
Held-to-maturity
Private label residential MBS	$	—	$	—	$	—	$	—	$	—	$	—	$	216.9	$	216.9
Tax-exempt	—		—		—		—		—		—		890.2		890.2
Total HTM securities (1)	$	—	$	—	$	—	$	—	$	—	$	—	$	1,107.1	$	1,107.1
Available-for-sale debt securities
CLO	$	45.0	$	—	$	635.6	$	245.6	$	—	$	—	$	—	$	926.2
Commercial MBS issued by GSEs	—		68.5		—		—		—		—		—		68.5
Corporate debt securities	—		—		—		45.3		318.7		18.9		—		382.9
Private label residential MBS	1,419.6		—		87.4		—		0.9		—		0.1		1,508.0
Residential MBS issued by GSEs	—		1,993.4		—		—		—		—		—		1,993.4
Tax-exempt	43.2		40.4		469.1		628.9		—		—		33.5		1,215.1
U.S. treasury securities	—		13.0		—		—		—		—		—		13.0
Other	—		—		12.1		10.0		30.2		9.6		19.8		81.7
Total AFS securities (1)	$	1,507.8	$	2,115.3	$	1,204.2	$	929.8	$	349.8	$	28.5	$	53.4	$	6,188.8
Equity securities
CRA investments	$	—	$	27.3	$	—	$	—	$	—	$	—	$	17.3	$	44.6
Preferred stock	—		—		—		—		79.3		20.2		14.4		113.9
Total equity securities (1)	$	—	$	27.3	$	—	$	—	$	79.3	$	20.2	$	31.7	$	158.5

(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, 2022 the Company does 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, 2022, 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, 2022
	Amortized Cost		Estimated Fair Value
	(in millions)
Held-to-maturity
Due in one year or less	$	41.6	$	41.7
After one year through five years	18.2		18.0
After five years through ten years	7.2		7.5
After ten years	882.9		880.5
Mortgage-backed securities	211.1		192.2
Total HTM securities	$	1,161.0	$	1,139.9
Available-for-sale
Due in one year or less	$	1.5	$	1.5
After one year through five years	120.6		117.9
After five years through ten years	1,055.7		1,046.1
After ten years	2,405.0		2,376.3
Mortgage-backed securities	3,582.7		3,310.4
Total AFS securities	$	7,165.5	$	6,852.2

During the three months ended March 31, 2022, the Company sold certain AFS securities as part of the Company's interest rate management actions to secure gains on securities, primarily tax-exempt municipal securities that were purchased at a discount at the onset of the COVID-19 pandemic. These securities had a carrying value of $107.3 million and a gain of $6.9 million was recognized on the sale of these securities. The Company did not have significant sales of investments securities during the three months ended March 31, 2021.

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Stockholders' Equity

9 Months Ended

Sep. 30, 2021

Stockholders' Equity Note [Abstract]

Stockholder's Equity

Stock-Based Compensation

Restricted Stock Awards

Restricted stock awards granted to employees generally vest over a 3-year period. Stock grants made to non-employee WAL directors in 2022 will be fully vested on July 1, 2022. 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, 2022 and 2021 was $40.0 million and $23.7 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, 2022, the Company recognized $7.1 million in stock-based compensation expense related to these stock grants, compared to $5.6 million for the three months ended March 31, 2021.

In addition, the Company previously granted shares of restricted stock to certain members of executive management that had both performance and service conditions that affect vesting. There were no such grants made during the three months ended March 31, 2022 and 2021, however expense was still being recognized through June 30, 2021 for a grant made in 2017 with a four-year vesting period. The Company recognized $0.3 million in stock-based compensation expense related to these performance-based restricted stock grants during the three months ended March 31, 2021.

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. For the three months ended March 31, 2022, the Company recognized $2.8 million in stock-based compensation expense related to these performance stock units, compared to $2.1 million in stock-based compensation expense for such units during the three months ended March 31, 2021.

The three-year performance period for the 2019 grant ended on December 31, 2021, and the Company's cumulative EPS and TSR performance measure for the performance period exceeded the level required for a maximum award under the terms of the grant. As a result, 203,646 shares became fully vested and distributed to executive management in the first quarter of 2022.

Preferred Stock

On September 15, 2021, the Company entered into an underwriting agreement, pursuant to which the Company agreed to issue and sell an aggregate of 12,000,000 depositary shares, 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).

On February 8, 2022, the Company declared a quarterly cash dividend of $0.27 per depositary share, for a total dividend payment to preferred shareholders of $3.2 million that was paid on March 30, 2022.

Common Stock Issuances

Pursuant to ATM Distribution Agreement

The Company has a distribution agency agreement with J.P. Morgan Securities LLC and Piper Sandler & Co., under which the Company may sell up to 6,132,670 shares of its common stock on the NYSE. The Company pays the distribution agents a mutually agreed rate, not to exceed 2% of the gross offering proceeds of the shares sold pursuant to the distribution agency agreement. The common stock will be sold at prevailing market prices at the time of the sale or at negotiated prices and, as a result, prices will vary. Sales under the ATM program are being 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). During the three months ended March 31, 2022, the Company sold 1.3 million shares under the ATM program at a weighted-average selling price of $86.78 per share for gross proceeds of $108.4 million. Total related offering costs were $0.7 million, substantially all of which relates to compensation costs paid to J.P. Morgan Securities LLC and Piper Sandler & Co. As of March 31, 2022, the remaining number of shares that can be sold under this agreement totaled 1,750,856.

Registered Direct Offering

The Company sold 2.3 million shares of its common stock in a registered direct offering during the three months ended March 31, 2021. The shares were sold for $91.00 per share for aggregate net proceeds of $209.2 million.

Cash Dividend on Common Shares

During the three months ended March 31, 2022, the Company declared and paid a cash dividend of $0.35, for a total dividend payment to shareholders of $37.3 million. During the three months ended March 31, 2021, the Company declared and paid a cash dividend of $0.25 per share, for a total dividend payment to shareholders of $25.3 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, 2022, the Company purchased treasury shares of 185,534 at a weighted average price of $93.51 per share. During the three months ended March 31, 2021, the Company purchased treasury shares of 154,163 at a weighted average price of $83.56 per share.

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Accumulated Other Comprehensive Income

3 Months Ended

Mar. 31, 2022

Equity [Abstract]

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 gains (losses) on SERP		Unrealized holding gains (losses) on junior subordinated debt		Total
	(in millions)
Balance, December 31, 2021	$	16.7	$	(0.3)	$	(0.7)	$	15.7
Other comprehensive (loss) income before reclassifications	(247.9)		—		2.2		(245.7)
Amounts reclassified from AOCI	(5.1)		—		—		(5.1)
Net current-period other comprehensive (loss) income	(253.0)		—		2.2		(250.8)
Balance, March 31, 2022	$	(236.3)	$	(0.3)	$	1.5	$	(235.1)
Balance, December 31, 2020	$	92.1	$	(0.3)	$	0.5	$	92.3
Other comprehensive loss before reclassifications	(72.0)		—		(0.3)		(72.3)
Amounts reclassified from AOCI	(0.1)		—		—		(0.1)
Net current-period other comprehensive loss	(72.1)		—		(0.3)		(72.4)
Balance, March 31, 2021	$	20.0	$	(0.3)	$	0.2	$	19.9

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Derivatives and Hedging

3 Months Ended

Mar. 31, 2022

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, including those derivative instruments assumed from the AmeriHome acquisition. Derivative instruments are contracts between two or more parties that have a notional amount and an underlying variable, require a small or no initial investment, and allow for the net settlement of positions. A derivative’s notional amount serves as the basis for the payment provision of the contract and takes the form of units, such as shares or dollars. A derivative’s underlying variable is a specified interest rate, security price, commodity price, foreign exchange rate, index, or other variable. The interaction between the notional amount and the underlying variable determines the number of units to be exchanged between the parties and influences the fair value of the derivative contract.

The primary types of derivatives that the Company uses are interest rate swaps, 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 Sheets, 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 and volatility of net interest income and EVE to interest rate fluctuations. 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 are based on LIBOR and will convert to SOFR upon the discontinuation of LIBOR in June 2023.

The Company also had pay fixed/receive variable interest rate swaps, designated as fair value hedges using the last-of-layer method to manage the exposure to changes in fair value associated with fixed rate loans, resulting from changes in the designated benchmark interest rate (federal funds rate). These last-of-layer hedges provided 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 is 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. During the year ended December 31, 2021, the Company completed a partial discontinuation of one of its last-of-layer hedges, which reduced the total hedged amount on these hedges from $1.0 billion to $880.0 million. During the three months ended March 31, 2022, the Company discontinued the remaining portion of these last-of-layer hedges. The cumulative basis adjustment on the discontinued last-of-layer hedges totaled $30.6 million, which was allocated across the remaining loan pool upon termination of the hedges and is being amortized over the remaining term.

The Company had a receive fixed/pay variable interest rate swap, designated as a fair value hedge on its $175.0 million subordinated debentures issued on June 16, 2016. This swap was terminated during the year ended December 31, 2021 in connection with the full redemption of the debt. The Company was paying a variable rate of three-month LIBOR plus 3.25% and was receiving quarterly fixed payments of 6.25% to match the payments on the debt.

Derivatives Not Designated in Hedge Relationships

Management enters into certain foreign exchange derivative contracts and back-to-back interest rate swaps 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. Contracts with customers, along with the related derivative trades that 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's back-to-back interest rate swaps are used to allow customers to manage long-term interest rate risk.

As it relates to the Company's mortgage banking business, it also uses derivative financial instruments to manage exposure to interest rate risk 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 and interest rate futures.

Fair Value Hedges

As of March 31, 2022 and December 31, 2021, the following amounts are reflected on the Consolidated Balance Sheets related to cumulative basis adjustments for outstanding fair value hedges:

	March 31, 2022				December 31, 2021
	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)	$	474.0	$	20.7	$	1,390.7	$	38.5

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

(2)As of December 31, 2021, included last-of-layer derivative instruments, with $880 million designated as the hedged amount (from a closed portfolio of prepayable fixed rate loans with a carrying value of $1.4 billion). The cumulative basis adjustment included in the carrying value of these hedged items totaled $15.7 million and the basis adjustment related to the discontinued portion was $1.0 million as of December 31, 2021.

For the Company's derivative instruments that are designated and qualify as a fair value hedge, 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 earnings 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 and for subordinated debt, the gain or loss on the hedged items was included in interest expense, as shown in the table below.

	Three Months Ended March 31,
	2022				2021
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	$	33.5	$	(33.4)	$	38.7	$	(38.7)
Interest expense	—		—		(5.7)		5.7

In addition to the gains and losses on the Company's outstanding fair value hedges presented in the above table, the Company recognized $1.0 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, 2022.

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, 2022, December 31, 2021, and March 31, 2021. The change in the notional amounts of these derivatives from March 31, 2021 to March 31, 2022 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, 2022						December 31, 2021						March 31, 2021
			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 swaps (1)	$	498.5	$	1.7	$	22.7	$	1,382.8	$	13.8	$	54.5	$	1,685.9	$	7.9	$	57.7
Total	498.5		1.7		22.7		1,382.8		13.8		54.5		1,685.9		7.9		57.7
Derivatives not designated as hedging instruments (2):
Foreign currency contracts	$	151.9	$	0.4	$	1.6	$	180.1	$	0.2	$	1.4	$	119.3	$	1.0	$	0.7
Forward purchase contracts	5,018.8		4.1		64.7		11,713.5		8.1		18.0		—		—		—
Forward sales contracts	9,557.0		149.3		6.4		17,358.5		15.8		17.7		—		—		—
Futures purchase contracts (3)	202,818.0		—		—		218,053.7		—		—		—		—		—
Futures sales contracts (3)	219,617.0		—		—		229,040.0		—		—		—		—		—
Interest rate lock commitments	2,419.6		5.8		17.2		3,033.2		11.0		1.6		—		—		—
Interest rate swaps	64.1		0.3		0.3		4.1		0.1		0.1		3.5		0.2		0.2
Total	$	439,646.4	$	159.9	$	90.2	$	479,383.1	$	35.2	$	38.8	$	122.8	$	1.2	$	0.9
Margin			0.1		64.9				1.2		6.5				—		—
Total, including margin	$	439,646.4	$	160.0	$	155.1	$	479,383.1	$	36.4	$	45.3	$	122.8	$	1.2	$	0.9

(1)Interest rate swap amounts include a notional amount of $880 million and $1.0 billion related to the last-of-layer hedges at December 31, 2021 and March 31, 2021, respectively.

(2)Relate to economic hedging arrangements.

(3)The Company enters into forward purchase and sales contracts that are subject to daily remargining and almost all of which, are based on three-month LIBOR to hedge against its MSR valuation exposure. The notional amount on these contracts is substantial as these contracts have a duration of only 0.25 years and are intended to cover the longer duration of MSR hedges.

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 Sheets, as summarized in the table below:

	March 31, 2022						December 31, 2021						March 31, 2021
	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
Forward purchase contracts	$	3.6	$	—	$	3.6	$	7.9	$	—	$	7.9	$	—	$	—	$	—
Forward sales contracts	148.8		—		148.8		15.5		—		15.5		—		—		—
Interest rate swaps	1.7		—		1.7		13.8		—		13.8		7.9		—		7.9
Margin	0.1		—		0.1		1.2		—		1.2		—		—		—
Netting	—		(130.0)		(130.0)		—		(28.4)		(28.4)		—		—		—
	$	154.2	$	(130.0)	$	24.2	$	38.4	$	(28.4)	$	10.0	$	7.9	$	—	$	7.9
Liabilities
Forward purchase contracts	$	(64.4)	$	—	$	(64.4)	$	(17.7)	$	—	$	(17.7)	$	—	$	—	$	—
Forward sales contracts	(6.2)		—		(6.2)		(17.6)		—		(17.6)		—		—		—
Interest rate swaps	(22.7)		—		(22.7)		(54.5)		—		(54.5)		(57.7)		—		(57.7)
Margin	(64.9)		—		(64.9)		(6.5)		—		(6.5)		—		—		—
Netting	—		130.0		130.0		—		28.4		28.4		—		—		—
	$	(158.2)	$	130.0	$	(28.2)	$	(96.3)	$	28.4	$	(67.9)	$	(57.7)	$	—	$	(57.7)
Derivatives not subject to master netting arrangements:
Assets
Foreign currency contracts	$	0.4	$	—	$	0.4	$	0.2	$	—	$	0.2	$	1.0	$	—	$	1.0
Forward purchase contracts	0.5		—		0.5		0.2		—		0.2		—		—		—
Forward sales contracts	0.5		—		0.5		0.3		—		0.3		—		—		—
Interest rate lock commitments	5.8		—		5.8		11.0		—		11.0		—		—		—
Interest rate swaps	0.3		—		0.3		0.1		—		0.1		0.2		—		0.2
	$	7.5	$	—	$	7.5	$	11.8	$	—	$	11.8	$	1.2	$	—	$	1.2
Liabilities
Foreign currency contracts	$	(1.6)	$	—	$	(1.6)	$	(1.4)	$	—	$	(1.4)	$	(0.7)	$	—	$	(0.7)
Forward purchase contracts	(0.3)		—		(0.3)		(0.3)		—		(0.3)		—		—		—
Forward sales contracts	(0.2)		—		(0.2)		(0.1)		—		(0.1)		—		—		—
Interest rate lock commitments	(17.2)		—		(17.2)		(1.6)		—		(1.6)		—		—		—
Interest rate swaps	(0.3)		—		(0.3)		(0.1)		—		(0.1)		(0.2)		—		(0.2)
	$	(19.6)	$	—	$	(19.6)	$	(3.5)	$	—	$	(3.5)	$	(0.9)	$	—	$	(0.9)
Total derivatives and margin
Assets	$	161.7	$	(130.0)	$	31.7	$	50.2	$	(28.4)	$	21.8	$	9.1	$	—	$	9.1
Liabilities	$	(177.8)	$	130.0	$	(47.8)	$	(99.8)	$	28.4	$	(71.4)	$	(58.6)	$	—	$	(58.6)

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

	Three Months Ended March 31, 2022
	($ in millions)
Net gain (loss) on loan origination and sale activities:
Interest rate lock commitments	$	(20.8)
Forward contracts	241.3
Other contracts	(3.7)
Total gain	$	216.8
Net loan servicing revenue:
Forward contracts	$	(34.9)
Options contracts	—
Futures contracts	(22.0)
Total loss	$	(56.9)

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, such as GNMA, FNMA, and FHLMC. The total collateral pledged by the Company to counterparties for its derivatives designated as hedging instruments totaled $45.0 million, $67.1 million, and $93.2 million as of March 31, 2022, December 31, 2021, and March 31, 2021, respectively.

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Earnings per Share

3 Months Ended

Mar. 31, 2022

Earnings Per Share [Abstract]

Earnings Per Share

Diluted EPS is based on the weighted average outstanding common shares during the period, including common stock equivalents. Basic EPS is based on 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,
	2022		2021
	(in millions, except per share amounts)
Weighted average shares - basic	106.0		100.8
Dilutive effect of stock awards	0.6		0.6
Weighted average shares - diluted	106.6		101.4
Net income available to common stockholders	$	236.9	$	192.5
Earnings per share - basic	2.23		1.91
Earnings per share - diluted	2.22		1.90

The Company had no anti-dilutive stock options outstanding as of March 31, 2022 and 2021.

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Income Taxes

3 Months Ended

Mar. 31, 2022

Income Tax Disclosure [Abstract]

Income Taxes

The Company's effective tax rate was 19.5% and 17.9% for the three months ended March 31, 2022 and 2021, respectively. The increase in the effective tax rate was primarily due to projected pretax book income growth outpacing growth in permanent tax benefit items for the year and an increase in state tax expense.

As of March 31, 2022, the net DTA balance totaled $67.6 million, an increase of $46.7 million from $20.9 million at December 31, 2021. This overall increase in the net DTA was primarily the result of decreases in the fair market value of AFS securities, which were not fully offset by increases to MSRs.

Although realization is not assured, the Company believes that the realization of the recognized deferred tax asset of $67.6 million at March 31, 2022 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, 2022 and December 31, 2021, 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. The limited liability entities are considered to be VIEs; however, as a limited partner, the Company is not the primary beneficiary and is not required to consolidate these entities.

Investments in LIHTC and renewable energy totaled $729.9 million and $631.3 million as of March 31, 2022 and December 31, 2021, respectively. Unfunded LIHTC and renewable energy obligations are included as part of Other liabilities on the Consolidated Balance Sheets and totaled $445.9 million and $360.8 million as of March 31, 2022 and December 31, 2021, respectively. For the three months ended March 31, 2022 and 2021, $13.4 million and $15.5 million, respectively, of amortization related to LIHTC investments was recognized as a component of income tax expense.

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Fair Value Accounting

3 Months Ended

Mar. 31, 2022

Fair Value Disclosures [Abstract]

Fair Value Accounting

The fair value of an asset or liability is the price that would be received to sell that asset or paid to transfer that 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 that 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). The three levels of the fair value hierarchy under ASC 825 are described in "Note 1. Summary of Significant Accounting Policies" of these Notes to Unaudited Consolidated Financial Statements.

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 that 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. Furthermore, the reported fair value amounts have not been comprehensively revalued since the presentation dates, and therefore, estimates of fair value after the balance sheet date may

differ significantly from the amounts presented herein. 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 as part of OCI rather than earnings. The Company did not elect FVO treatment for the junior subordinated debt assumed in the Bridge Capital Holdings acquisition.

For the three months ended March 31, 2022 and 2021, unrealized gains and losses from fair value changes on junior subordinated debt were as follows:

	Three Months Ended March 31,
	2022		2021
	(in millions)
Unrealized losses (gains)	$	2.9	$	(0.4)
Changes included in OCI, net of tax	2.2		(0.3)

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 primarily 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 loans HFS are salable into active markets. Accordingly, the fair value of these loans is based on quoted market or contracted selling prices or a market price equivalent, which are categorized as Level 2 in the fair value hierarchy.

The fair value of EBO loans, non-agency loans, and loans that are delinquent or have an underwriting defect are valued using Level 3 inputs since they lack active markets.

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 that 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: Treasury futures and options, Eurodollar futures, and swap futures are measured based on valuation techniques using Level 1 inputs from exchange-provided daily settlement quotes. Forward purchase and sales contracts are measured based on valuation techniques using Level 2 inputs, such as quoted market price, contracted selling price, or market price equivalent. Interest rate swaps are reported at fair value utilizing Level 2 inputs. The Company obtains dealer quotations to value its interest rate swaps. 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 the pull-through rate. The pull-through rate and servicing fee multiple are unobservable inputs based on historical experience.

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 that 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 as of the periods presented: 

	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
	(in millions)
March 31, 2022
Assets:
Available-for-sale debt securities
CLO	$	—	$	2,055.3	$	—	$	2,055.3
Commercial MBS issued by GSEs	—		62.2		—		62.2
Corporate debt securities	—		415.3		—		415.3
Private label residential MBS	—		1,343.2		—		1,343.2
Residential MBS issued by GSEs	—		1,905.0		—		1,905.0
Tax-exempt	—		992.9		—		992.9
Other	27.4		50.9		—		78.3
Total AFS debt securities	$	27.4	$	6,824.8	$	—	$	6,852.2
Equity securities
CRA investments	$	26.2	$	26.1	$	—	$	52.3
Preferred stock	112.4		—		—		112.4
Total equity securities	$	138.6	$	26.1	$	—	$	164.7
Loans HFS	$	—	$	2,940.5	$	7.9	$	2,948.4
Mortgage servicing rights	—		—		950.3		950.3
Derivative assets (1)	—		155.9		5.8		161.7
Liabilities:
Junior subordinated debt (2)	$	—	$	—	$	64.5	$	64.5
Derivative liabilities (1)	—		160.6		17.2		177.8

(1)See "Note 11. Derivatives and Hedging Activities." In addition, the carrying value of loans is increased by $20.7 million as of March 31, 2022 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.

(2)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
	(in millions)
December 31, 2021
Assets:
Available-for-sale debt securities
CLO	$	—	$	926.2	$	—	$	926.2
Commercial MBS issued by GSEs	—		68.5		—		68.5
Corporate debt securities	—		382.9		—		382.9
Private label residential MBS	—		1,508.0		—		1,508.0
Residential MBS issued by GSEs	—		1,993.4		—		1,993.4
Tax-exempt	—		1,215.1		—		1,215.1
U.S. treasury securities	13.0		—		—		13.0
Other	27.4		54.3		—		81.7
Total AFS debt securities	$	40.4	$	6,148.4	$	—	$	6,188.8
Equity securities
CRA investments	$	27.4	$	17.2	$	—	$	44.6
Preferred stock	113.9		—		—		113.9
Total equity securities	$	141.3	$	17.2	$	—	$	158.5
Loans - HFS	$	—	$	3,894.2	$	45.5	$	3,939.7
Mortgage servicing rights	—		—		698.0		698.0
Derivative assets (1)	—		39.2		11.0		50.2
Liabilities:
Junior subordinated debt (2)	$	—	$	—	$	67.4	$	67.4
Derivative liabilities (1)	—		98.2		1.6		99.8

(1)See "Note 11. Derivatives and Hedging Activities." In addition, the carrying value of loans is increased by $38.5 million as of December 31, 2021 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.

(2)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.

For the three months ended March 31, 2022 and 2021, 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,
	2022		2021
	(in millions)
Beginning balance	$	(67.4)	$	(65.9)
Change in fair value (1)	2.9		(0.4)
Ending balance	$	(64.5)	$	(66.3)

(1)Unrealized gains/(losses) attributable to changes in the fair value of junior subordinated debt are recorded as part of OCI, net of tax, and totaled $2.2 million and $(0.3) million for three months ended March 31, 2022 and 2021, respectively.

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

	March 31, 2022		Valuation Technique	Significant Unobservable Inputs	Input Value
	(in millions)
Junior subordinated debt	$	64.5	Discounted cash flow	Implied credit rating of the Company	3.80	%

	December 31, 2021		Valuation Technique	Significant Unobservable Inputs	Input Value
	(in millions)
Junior subordinated debt	$	67.4	Discounted cash flow	Implied credit rating of the Company	2.61	%

The significant unobservable inputs used in the fair value measurement of the Company’s junior subordinated debt as of March 31, 2022 and December 31, 2021 was the implied credit risk for the Company. As of March 31, 2022 and December 31, 2021,

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

As of March 31, 2022, the Company estimates the discount rate at 3.80%, which represents an implied credit spread of 2.84% plus three-month LIBOR (0.96%). As of December 31, 2021, the Company estimated the discount rate at 2.61%, which was a 2.40% credit spread plus three-month LIBOR (0.21%).

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, 2022
	Loans held for sale		Mortgage servicing rights		Net interest rate lock commitments (1)
	(in millions)
Balance, December 31, 2021	$	45.5	$	698.0	$	9.4
Purchases and additions	292.2		204.1		5,323.3
Sales and payments	(350.7)		—		—
Transfers from Level 2 to Level 3	38.5		—		—
Transfers from Level 3 to Level 2	(17.6)		—		—
Settlement of interest rate lock commitments upon acquisition or origination of loans HFS	—		—		(5,321.1)
Change in fair value	—		81.4		(23.0)
Realization of cash flows	—		(33.2)		—
Balance, March 31, 2022	$	7.9	$	950.3	$	(11.4)
Unrealized (losses) gains included in income related to assets held at period end	$	—	$	80.4	$	(11.4)

(1)     Interest rate lock commitment asset and liability positions are presented net.

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

		March 31, 2022
Asset/liability	Key inputs	Range	Weighted average
Mortgage servicing rights:	Option adjusted spread (in basis points)	408 - 623	518
	Conditional prepayment rate (1)	8.9% - 17.2%	13.0%
	Recapture rate	20.0% - 20.0%	20.0%
	Servicing fee rate (in basis points)	25.0 - 50.0	30.1
	Cost to service	$84 - $91	$86
Loans held for sale:	Whole loan spread to TBA price (in basis points)	(4.2) - (2.0)	(3.1)
Interest rate lock commitments:	Servicing fee multiple	3.6 - 5.6	4.7
	Pull-through rate	73% - 100%	89%

		December 31, 2021
Asset/liability	Key inputs	Range	Weighted average
Mortgage servicing rights:	Option adjusted spread (in basis points)	553 - 735	600
	Conditional prepayment rate (1)	9.9% - 20.7%	15.2
	Recapture rate	20.0% - 20.0%	20
	Servicing fee rate (in basis points)	25.0 - 50.0	29.5
	Cost to service	$84 - $91	86
Loans held for sale:	Whole loan spread to TBA price (in basis points)	(3.7) - (2.9)	(3.3)
Interest rate lock commitments:	Servicing fee multiple	3.6 - 5.4	4.6
	Pull-through rate	75% - 100%	90

(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 fair value option has been elected:

	March 31, 2022						December 31, 2021
	Fair value		Unpaid principal balance		Difference		Fair value		Unpaid principal balance		Difference
	(in millions)
Loans held for sale:
Current through 89 days delinquent	$	2,946.4	$	2,936.9	$	9.5	$	3,937.5	$	3,807.3	$	130.2
90 days or more delinquent	2.0		2.1		(0.1)		2.2		2.2		—
Total	$	2,948.4	$	2,939.0	$	9.4	$	3,939.7	$	3,809.5	$	130.2

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, 2022:
Loans HFI	$	259.6	$	—	$	—	$	259.6
Other assets acquired through foreclosure	11.7		—		—		11.7
As of December 31, 2021:
Loans HFI	$	216.0	$	—	$	—	$	216.0
Other assets acquired through foreclosure	11.7		—		—		11.7

For Level 3 assets measured at fair value on a nonrecurring basis as of March 31, 2022 and December 31, 2021, the significant unobservable inputs used in the fair value measurements were as follows:

	March 31, 2022		Valuation Technique(s)		Significant Unobservable Inputs	Range
	(in millions)
Loans HFI	$	259.6	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 6.0%
				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	11.7		Collateral method	Third party appraisal	Costs to sell	4.0% to 10.0%

	December 31, 2021		Valuation Technique(s)		Significant Unobservable Inputs	Range
	(in millions)
Loans HFI	$	216.0	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 6.0%
				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	11.7		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 $259.6 million and $216.0 million at March 31, 2022 and December 31, 2021, respectively, net of a specific allowance for credit losses of $7.0 million and $10.8 million at March 31, 2022 and December 31, 2021, 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 twelve 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 $11.7 million of such assets at March 31, 2022 and December 31, 2021.

Fair Value of Financial Instruments

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

	March 31, 2022
	Carrying Amount		Fair Value
			Level 1		Level 2		Level 3		Total
	(in millions)
Financial assets:
Investment securities:
HTM	$	1,161.0	$	—	$	1,139.9	$	—	$	1,139.9
AFS	6,852.2		27.4		6,824.8		—		6,852.2
Equity	164.7		138.6		26.1		—		164.7
Derivative assets	161.7		—		155.9		5.8		161.7
Loans HFS	4,761.6		—		2,940.5		1,828.3		4,768.8
Loans HFI, net	40,861.5		—		—		41,030.6		41,030.6
Mortgage servicing rights	950.3		—		—		950.3		950.3
Accrued interest receivable	235.6		—		235.6		—		235.6
Financial liabilities:
Deposits	$	52,159.5	$	—	$	52,162.7	$	—	$	52,162.7
Other borrowings	833.3		—		798.2		—		798.2
Qualifying debt	893.3		—		808.7		77.8		886.5
Derivative liabilities	177.8		—		160.6		17.2		177.8
Accrued interest payable	13.5		—		13.5		—		13.5

	December 31, 2021
	Carrying Amount		Fair Value
			Level 1		Level 2		Level 3		Total
	(in millions)
Financial assets:
Investment securities:
HTM	$	1,107.1	$	—	$	1,146.4	$	—	$	1,146.4
AFS	6,188.8		40.4		6,148.4		—		6,188.8
Equity securities	158.5		141.3		17.2		—		158.5
Derivative assets	50.2		—		39.2		11.0		50.2
Loans HFS	5,635.1		—		3,894.2		1,760.2		5,654.4
Loans HFI, net	38,822.9		—		—		39,218.2		39,218.2
Mortgage servicing rights	698.0		—		—		698.0		698.0
Accrued interest receivable	227.9		—		227.9		—		227.9
Financial liabilities:
Deposits	$	47,612.0	$	—	$	47,615.5	$	—	$	47,615.5
Other borrowings	1,501.9		—		1,518.4		—		1,518.4
Qualifying debt	895.8		—		857.3		81.3		938.6
Derivative liabilities	99.8		—		98.2		1.6		99.8
Accrued interest payable	9.2		—		9.2		—		9.2

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 that does not conform to both management and BOD risk tolerances without ALCO approval. There is also ALCO reporting at the Parent level for reviewing interest rate risk for the Company, which gets 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, 2022 and December 31, 2021 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, 2022 and December 31, 2021.

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Segments

3 Months Ended

Mar. 31, 2022

Segment Reporting [Abstract]

Segments

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

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

•Corporate & Other segment: consists of the Company's investment portfolio, Corporate borrowings and other related items, income and expense items not allocated to our 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 year. 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 that 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 life of the assets or liabilities in the portfolio. Residual funds transfer pricing mismatches are allocable to the Corporate & Other segment and presented as part of 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 the effective tax rate for the geographic location of the segment. 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:

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Summary of Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2022

Accounting Policies [Abstract]

Nature of Operation

Nature of operation

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 blockchain-based 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 has added to its capabilities with the acquisition of DST on January 25, 2022, which provides digital payment services for the class action legal industry. In addition, the Company has two non-bank subsidiaries, which are LVSP, which held and managed certain OREO properties, and 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.

Basis of Presentation

Basis of presentation

The accounting and reporting policies of the Company are in accordance with GAAP and conform to practices within the financial services industry. The accounts of the Company and its consolidated subsidiaries are included in the Consolidated Financial Statements.

Recent Accounting Pronouncements

Recent accounting pronouncements

Troubled Debt Restructurings and Vintage Disclosures

In March 2022, the FASB issued guidance within ASU 2022-02, Financial Instruments—Credit Losses (Topic 326). The amendments in this update eliminate the accounting guidance and related disclosures for TDRs by creditors in Subtopic 310-40, Receivables—Troubled Debt Restructurings by Creditors, while enhancing disclosure requirements for certain loan refinancings and restructurings by creditors when a borrower is experiencing financial difficulty and requiring an entity to disclose current-period gross writeoffs by year of origination for financing receivables and net investments in leases within the scope of Subtopic 326-20, Financial Instruments—Credit Losses—Measured at Amortized Cost.

The amendments in this update are effective for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years and are applied prospectively, except with respect to the recognition and measurement of TDRs, where an entity has the option to apply a modified retrospective transition method. Early adoption of the amendments in this update is permitted. An entity may elect to early adopt the amendments regarding TDRs and related disclosure enhancements separately from the amendments related to vintage disclosures. The adoption of this accounting guidance is not expected to have a material impact on the Company's Consolidated Financial Statements.

Recently adopted accounting guidance

Reference Rate Reform

In March 2020, the FASB issued guidance within ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting, in response to the scheduled discontinuation of LIBOR. Since the issuance of this guidance, the publication cessation of U.S. dollar LIBOR has been extended to June 30, 2023. The amendments in this update provide optional guidance designed to provide relief from the accounting analysis and impacts that may otherwise be required for modifications to agreements (e.g., loans, debt securities, derivatives, borrowings) necessitated by reference rate reform.

The following optional expedients for applying the requirements of certain ASC Topics or Industry Subtopics in the Codification are permitted for contracts that are modified because of reference rate reform and that meet certain scope guidance: 1) modifications of contracts within the scope of ASC Topics 310, Receivables, and 470, Debt, should be accounted for by prospectively adjusting the effective interest rate; 2) modifications of contracts within the scope of ASC Topic 842, Leases, should be accounted for as a continuation of the existing contracts with no reassessments of the lease classification and the discount rate or remeasurements of lease payments that otherwise would be required under this ASC Topic for modifications not accounted for as separate contracts; 3) modifications of contracts do not require an entity to reassess its original conclusion about whether that contract contains an embedded derivative that is clearly and closely related to the

economic characteristics and risks of the host contract under Subtopic ASC 815-15, Derivatives and Hedging- Embedded Derivatives; and 4) for other ASC Topics or Industry Subtopics in the Codification, the amendments in this update also include a general principle that permits an entity to consider contract modifications due to reference rate reform to be an event that does not require contract remeasurement at the modification date or reassessment of a previous accounting determination.

In January 2021, the FASB issued ASU 2021-01, Reference Rate Reform (Topic 848): Scope in order to clarify that certain optional expedients and exceptions in ASC Topic 848 apply to derivatives that are affected by the discounting transition. Specifically, certain provisions in ASC Topic 848, if elected by an entity, apply to derivative instruments that use an interest rate for margining, discount, or contract price alignment that is modified as a result of reference rate reform.

Due to the prospective nature of the revised guidance, the adoption of this accounting guidance did not have a material impact on the Company's Consolidated Financial Statements.

Convertible Debt and Derivatives and Hedging

In August 2020, the FASB issued guidance within ASU 2020-06, Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity’s Own Equity (Subtopic 815-40). The amendments in this update affect entities that issue convertible instruments and/or contracts indexed to and potentially settled in an entity’s own equity. This update simplifies the convertible accounting framework through elimination of the beneficial conversion and cash conversion accounting models for convertible instruments. It also amends the accounting for certain contracts in an entity’s own equity that are currently accounted for as derivatives because of specific settlement provisions. In addition, the new guidance modifies how particular convertible instruments and certain contracts that may be settled in cash or shares impact the diluted EPS computation. The Company adopted the amendments within ASU 2020-06 using the modified retrospective method. The adoption of this guidance did not have a material impact on the Company’s Consolidated Financial Statements.

Use of Estimates

Use of estimatesThe 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, particularly to the extent that economic conditions worsen or persist longer than expected in an adverse state, relate to: 1) the determination of the allowance for credit losses; 2) certain assets and liabilities carried at fair value; and 3) accounting for income taxes.

Principles of Consolidation

Principles of consolidation

As of March 31, 2022, 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 Mortgage.

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 have no effect on net income or stockholders’ equity as previously reported.

Investment Securities

Investment securities

Investment securities include debt and equity securities. Debt securities may be classified as HTM, AFS, or trading. The appropriate classification is initially decided at the time of purchase. Securities classified as HTM are those debt securities that the Company has both the intent and ability to hold to maturity regardless of changes in market conditions, liquidity needs, or general economic conditions. The sale of an HTM security within three months of its maturity date or after the majority of the principal outstanding has been collected is considered a maturity for purposes of classification and disclosure. Securities classified as AFS are debt securities that the Company intends to hold for an indefinite period of time, but not necessarily to maturity. Any decision to sell a security classified as AFS would be based on various factors, including significant movements in interest rates, changes in the maturity mix of the Company’s assets and liabilities, liquidity needs, decline in credit quality, and regulatory capital considerations.

HTM securities are carried at amortized cost. AFS securities are carried at their estimated fair value, with unrealized holding gains and losses reported in OCI, net of tax. When AFS debt securities are sold, the unrealized gains or losses are reclassified from OCI to non-interest income. Trading securities are carried at their estimated fair value, with changes in fair value reported in earnings as part of non-interest income.

Equity securities are carried at their estimated fair value, with changes in fair value reported in earnings as part of non-interest income.

Interest income is recognized based on the coupon rate and includes the amortization of purchase premiums and the accretion of purchase discounts. Premiums and discounts on investment securities are generally amortized or accreted over the contractual life of the security using the interest method. For the Company's mortgage-backed securities, amortization or accretion of premiums or discounts are adjusted for anticipated prepayments. Gains and losses on the sale of investment securities are recorded on the trade date and determined using the specific identification method.

A debt security is placed on nonaccrual status at the time its principal or interest payments become 90 days past due. Interest accrued but not received for a security placed on nonaccrual is reversed against interest income.

Credit Loss, Financial Instrument [Policy Text Block]

Allowance for credit losses on investment securities

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 Company measures expected credit losses on its HTM debt securities on a collective basis by major security type. The Company's HTM securities portfolio consists of low income housing tax-exempt bonds and private label residential MBS. Low income housing tax-exempt bonds share similar risk characteristics with the Company's CRE, non-owner occupied or construction and land loan pools, given the similarity in underlying assets or collateral. Accordingly, expected credit losses on HTM securities are estimated using the same models and approaches as these loan pools, which utilize risk parameters (probability of default, loss given default, and exposure at default) in the measurement of expected credit losses. The historical data used to estimate probability of default and severity of loss in the event of default is derived or obtained from internal and external sources and adjusted for the expected effects of reasonable and supportable forecasts over the expected lives of the securities on those historical losses. Accrued interest receivable on HTM securities, which is included in other assets on the Consolidated Balance Sheet, is excluded from the estimate of expected credit losses.

The credit loss model under ASC 326-30, applicable to AFS debt securities, requires recognition of credit losses through an allowance account with credit losses recognized once securities become impaired. For AFS debt securities, a decline in fair value due to credit loss results in recognition of an allowance for credit losses. Impairment may result from credit deterioration of the issuer or collateral underlying the security. An assessment to determine whether a decline in fair value resulted from a credit loss is performed at the individual security level. Among other factors, the Company considers: 1) the extent to which the fair value is less than the amortized cost basis; 2) the financial condition and near term prospects of the issuer, including consideration of relevant financial metrics or ratios of the issuer; 3) any adverse conditions related to an industry or geographic area of an issuer; 4) any changes to the rating of the security by a rating agency; and 5) any past due principal or interest payments from the issuer. If an assessment of the above factors indicates that a credit loss exists, the Company records an allowance for credit losses for the excess of the amortized cost basis over the present value of cash flows expected to be collected, limited to the amount that the security's fair value is less than its amortized cost basis. Subsequent changes in the allowance for credit losses are recorded as a provision for (or recovery of) credit loss expense. Interest accruals and amortization and accretion of premiums and discounts are suspended when the credit loss is recognized in earnings. Any interest received after the security has been placed on nonaccrual status is recognized on a cash basis. Accrued interest receivable on AFS debt securities, which is included in Other assets on the Consolidated Balance Sheet, is excluded from the estimate of expected credit losses.

For each AFS security in an unrealized loss position, the Company also considers: 1) its intent to retain the security until anticipated recovery of the security's fair value; and 2) whether it is more-likely-than not that the Company would be required to sell the security before recovery of its amortized cost basis. If either of the criteria regarding intent or requirement to sell is met, the debt security is written down to its fair value and the write-down is charged against the allowance for credit losses with any incremental impairment recorded in earnings.

Write-offs are made through reversal of the allowance for credit losses and a direct write-off of the amortized cost basis of the AFS security. The Company considers the following events to be indicators that a write-off should be taken: 1) bankruptcy of the issuer; 2) significant adverse event(s) affecting the issuer in which it is improbable for the issuer to make its remaining payments on the security; and 3) significant loss of value of the underlying collateral behind a security. Recoveries on debt securities, if any, are recorded in the period received.

Off-balance sheet credit exposures, including unfunded loan commitments

The Company maintains a separate allowance for credit losses on off-balance-sheet credit exposures, including unfunded loan commitments, financial guarantees, and letters of credit, which is classified in Other liabilities on the Consolidated Balance Sheet. The allowance for credit losses on off-balance sheet credit exposures is adjusted through increases or decreases to the provision for credit loss expense. The estimate includes consideration of the likelihood that funding will occur, an estimate of exposure at default that is derived from utilization rate assumptions using a non-modeled approach, and PD and LGD estimates that are derived from the same models and approaches for the Company's other loan portfolio segments described in the Allowance for credit losses on HFI loans section within this note as these unfunded commitments share similar risk characteristics with these loan portfolio segments. The Company does not record a credit loss estimate for off-balance sheet credit exposures that are unconditionally cancellable by the Company or for undrawn amounts under such arrangements that may be drawn prior to the cancellation of the arrangement.

Restricted Stock

Restricted stockWAB is a member of the Federal Reserve System and, as part of its membership, is required to maintain stock in the FRB in a specified ratio to its capital. In addition, WAB is a member of the FHLB system and, accordingly, maintains an investment in the capital stock of the FHLB based on the borrowing capacity used. These investments are considered equity securities with no actively traded market. Therefore, the shares are considered restricted investment securities. These investments are carried at cost, which is equal to the value at which they may be redeemed. Dividend income received from the stock is reported in interest income. The Company conducts a periodic review and evaluation of its restricted stock to determine if any impairment exists. No impairment has been recorded to date.

Loans, Interest and Fees from Loans

Loans held for investment

Loans that management has the intent and ability to hold for the foreseeable future or until maturity or payoff are reported at amortized cost. Amortized cost is the amount of unpaid principal, adjusted for unamortized net deferred fees and costs, premiums and discounts, and write-offs. In addition, the amortized cost of loans subject to a fair value hedge are adjusted for changes in value attributable to the effective portion of the hedged benchmark interest rate risk.

The Company may also purchase loans or acquire loans through a business combination. At the purchase or acquisition date, loans are evaluated to determine whether there has been more than insignificant credit deterioration since origination. Loans that have experienced more than insignificant credit deterioration since origination are referred to as PCD loans. In its evaluation of whether a loan has experienced more than insignificant deterioration in credit quality since origination, the Company takes into consideration loan grades, loan-to-values greater than policy limits, past due and nonaccrual status, and TDR loans. The Company may also consider external credit rating agency ratings for borrowers and for non-commercial loans, FICO score or band, probability of default levels, and number of times past due. The initial estimate of credit losses on PCD loans is added to the purchase price on the acquisition date to establish the initial amortized cost basis of the loan; accordingly, the initial recognition of expected credit losses has no impact on net income. When the initial measurement of expected credit losses on PCD loans are calculated on a pooled loan basis, the expected credit losses are allocated to each loan within the pool. Any difference between the initial amortized cost basis and the unpaid principal balance of the loan represents a noncredit discount or premium, which is accreted (or amortized) into interest income over the life of the loan. Subsequent changes to the allowance for credit losses on PCD loans are recorded through the provision for credit losses. For purchased loans that are not deemed to have experienced more than insignificant credit deterioration since origination, any discounts or premiums included in the purchase price are accreted (or amortized) over the contractual life of the individual loan. For additional information, see "Note 5. Loans, Leases and Allowance for Credit Losses" of these Notes to Unaudited Consolidated Financial Statements.

In applying the effective yield method to loans, the Company generally applies the contractual method whereby loan fees collected for the origination of loans less direct loan origination costs (net of deferred loan fees), as well as premiums and discounts and certain purchase accounting adjustments, are amortized over the contractual life of the loan through interest income. If a loan has scheduled payments, the amortization of the net deferred fee is calculated using the interest method over the contractual life of the loan. If a loan does not have scheduled payments, such as a line of credit, the net deferred loan fee is recognized as interest income on a straight-line basis over the contractual life of the loan commitment. Commitment fees based

on a percentage of a customer’s unused line of credit and fees related to standby letters of credit are recognized over the commitment period. When loans are repaid, any remaining unamortized balances of premiums, discounts, or net deferred fees are recognized as interest income.

Nonaccrual loans

When a borrower discontinues making payments as contractually required by the note, the Company must determine whether it is appropriate to continue to accrue interest. The Company ceases accruing interest income when the loan has become delinquent by more than 90 days or when management determines that the full repayment of principal and collection of interest according to contractual terms is no longer likely. Past due status is based on the contractual terms of the loan. The Company may decide to continue to accrue interest on certain loans more than 90 days delinquent if the loans are well secured by collateral and in the process of collection.

For all HFI loan types, when a loan is placed on nonaccrual status, all interest accrued but uncollected is reversed against interest income in the period in which the status is changed, and the Company makes a loan-level decision to apply either the cash basis or cost recovery method. The Company may recognize income on a cash basis when a payment is received and only for those nonaccrual loans for which the collection of the remaining principal balance is not in doubt. Under the cost recovery method, subsequent payments received from the customer are applied to principal and generally no further interest income is recognized until the loan principal has been paid in full or until circumstances have changed such that payments are again consistently received as contractually required. Loans are returned to accrual status when all of the principal and interest amounts contractually due are brought current and future payments are reasonably assured.

Troubled Debt Restructured Loans

A TDR loan is a loan on which the Company, for reasons related to a borrower’s financial difficulties, grants a concession to the borrower that the Company would not otherwise consider. In order to determine whether a borrower is experiencing financial difficulty, an evaluation is performed to assess the probability that the borrower will be in payment default on any of its debt in the foreseeable future without the modification. The evaluation is performed in accordance with the Company's internal underwriting policy. The loan terms that may be modified or restructured due to a borrower’s financial situation include, but are not limited to, a reduction in the stated interest rate, an extension of the maturity or renewal of the loan at an interest rate below current market, a reduction in the face amount of the debt, a reduction in the accrued interest, or deferral of interest payments. A TDR loan may be returned to accrual status when the loan is brought current, has performed in accordance with the contractual restructured terms for a reasonable period of time (generally six months), and the ultimate collectability of the total contractual restructured principal and interest is no longer in doubt. Consistent with regulatory guidance, a TDR loan that is subsequently modified in another restructuring agreement but has shown sustained performance and classification as a TDR, will be removed from TDR status provided that the modified terms were market-based at the time of modification.

The CARES Act, signed into law on March 27, 2020, permitted financial institutions to suspend requirements under GAAP for loan modifications to borrowers affected by COVID-19 that would otherwise be characterized as TDRs and suspend any determination related thereto if (i) the loan modification was made between March 1, 2020 and December 31, 2020 and (ii) the applicable loan was not more than 30 days past due as of December 31, 2019. The Consolidated Appropriations Act, 2021, extended these provisions through January 1, 2022, which have now expired. In addition, federal bank regulatory authorities issued guidance to encourage financial institutions to make loan modifications for borrowers affected by COVID-19 and assured financial institutions that they will neither receive supervisory criticism for such prudent loan modifications, nor be required by examiners to automatically categorize COVID-19-related loan modifications as TDRs. The Company has been applying this guidance to qualifying loan modifications.

Credit quality indicators

Loans are regularly reviewed to assess credit quality indicators and to determine appropriate loan classification and grading in accordance with applicable bank regulations. The Company’s risk rating methodology assigns risk ratings ranging from 1 to 9, where a higher rating represents higher risk. The Company differentiates its loan segments based on shared risk characteristics for which expected credit losses are measured on a pool basis.

The nine risk rating categories can generally be described by the following groupings for loans:

"Pass" (grades 1 through 5): The Company has five pass risk ratings, which represent a level of credit quality that ranges from having no well-defined deficiency or weakness to some noted weakness; however, the risk of default on any loan classified as pass is expected to be remote. The five pass risk ratings are described below:

Minimal risk. Consist of loans that are fully secured either with cash held in a deposit account at the Bank or by readily marketable securities with an acceptable margin based on the type of security pledged.

Low risk. Consist of loans with a high investment grade rating equivalent.

Modest risk. Consist of loans where the credit facility greatly exceeds all policy requirements or with policy exceptions that are appropriately mitigated. A secondary source of repayment is verified and considered sustainable. Collateral coverage on these loans is sufficient to fully cover the debt as a tertiary source of repayment. Debt of the borrower is low relative to borrower’s financial strength and ability to pay.

Average risk. Consist of loans where the credit facility meets or exceeds all policy requirements or with policy exceptions that are appropriately mitigated. A secondary source of repayment is available to service the debt. Collateral coverage is more than adequate to cover the debt. The borrower exhibits acceptable cash flow and moderate leverage.

Acceptable risk. Consist of loans with an acceptable primary source of repayment, but a less than preferable secondary source of repayment. Cash flow is adequate to service debt, but there is minimal excess cash flow. Leverage is moderate or high.

"Special mention" (grade 6): These are generally assets that possess potential weaknesses that warrant management's close attention. These loans may involve borrowers with adverse financial trends, higher debt-to-equity ratios, or weaker liquidity positions, but not to the degree of being considered a “problem loan” where risk of loss may be apparent. Loans in this category are usually performing as agreed, although there may be non-compliance with financial covenants.

"Substandard" (grade 7): These assets are characterized by well-defined credit weaknesses and carry the distinct possibility that the Company will sustain some loss if such weakness or deficiency is not corrected. All loans 90 days or more past due and all loans on nonaccrual status are considered at least "Substandard," unless extraordinary circumstances would suggest otherwise.

"Doubtful" (grade 8): These assets have all the weaknesses inherent in those classified as "Substandard" with the added characteristic that the weaknesses present make collection or liquidation in full, on the basis of currently existing facts, conditions and values, highly questionable and improbable, but because of certain known factors that may work to the advantage and strengthening of the asset (for example, capital injection, perfecting liens on additional collateral and refinancing plans), classification as an estimated loss is deferred until a more precise status may be determined. Due to the high probability of loss, loans classified as "Doubtful" are placed on nonaccrual status.

"Loss" (grade 9): These assets are considered uncollectible and having such little recoverable value that it is not practical to defer writing off the asset. This classification does not mean that the loan has absolutely no recovery or salvage value, but rather that it is not practicable or desirable to defer writing off the asset, even though partial recovery may be achieved in the future.

Allowance for Credit Losses

Allowance for credit losses on HFI loans

Credit risk is inherent in the business of extending loans and leases to borrowers and is continuously monitored by management and reflected within the allowance for credit losses. The allowance for credit losses is an estimate of life-of-loan losses for the Company's loans HFI. The allowance for credit losses is a valuation account that is deducted from the amortized cost basis of a loan to present the net amount expected to be collected on the loan. Accrued interest receivable on these loans, which is included in Other assets on the Consolidated Balance Sheet, is excluded from the estimate of expected credit losses. Expected recoveries of amounts previously written off and expected to be written off are included in the valuation account and may not exceed the aggregate of amounts previously written off and expected to be written off. The Company formally re-evaluates and establishes the appropriate level of the allowance for credit losses on a quarterly basis.

Determining the appropriateness of the allowance is complex and requires judgment by management about the effect of matters that are inherently uncertain. In future periods, evaluations of the overall loan portfolio or particular segments of the loan portfolio, in light of the factors and forecasts then prevailing, may result in significant changes in the allowance for credit losses and credit loss expense in those future periods. The allowance level is influenced by loan volumes, mix, loan performance metrics, asset quality characteristics, delinquency status, historical credit loss experience, and the inputs and assumptions in economic forecasts, such as macroeconomic inputs, length of reasonable and supportable forecast periods, and reversion methods. The methodology for estimating the amount of expected credit losses reported in the allowance for credit losses has two basic components: first, an asset-specific component involving individual loans that do not share similar risk characteristics with other loans and the measurement of expected credit losses for such individual loans and; second, a pooled component for estimated expected credit losses for loans that share similar risk characteristics.

Loans that do not share risk characteristics with other loans

Loans that do not share risk characteristics with other loans are evaluated on an individual basis. Loans evaluated individually are not included in the collective evaluation. These loans consist of loans with unique features or loans that no longer share risk characteristics with other pooled loans. The process for determining whether a loan should be evaluated on an individual basis begins with determination of credit rating. With the exception of residential loans, all accruing loans graded substandard or worse with a total commitment of $1.0 million or more are assigned a reserve based on an individual evaluation. For these loans, the allowance is based primarily on the fair value of the underlying collateral, utilizing independent third-party appraisals.

Loans that share similar risk characteristics with other loans

In estimating the component of the allowance for credit losses for loans that share similar risk characteristics with other loans, such loans are segregated into loan segments. The Company's primary portfolio segments align with the methodology applied in estimating the allowance for credit losses under CECL. Loans are designated into loan segments based on loans pooled by product types, business lines, and similar risk characteristics or areas of risk concentration.

In determining the allowance for credit losses, the Company derives an estimate of expected credit losses primarily using an expected loss methodology that incorporates risk parameters (probability of default, loss given default, and exposure at default), which are derived from various vendor models, internally-developed statistical models, or non-statistical estimation approaches. Probability of default is projected in these models or estimation approaches using a single economic scenario and were developed to incorporate relevant information about past events, current conditions, and reasonable and supportable forecasts. With the exception of the Company's residential loan segment, the Company's PD models share a common definition of default, which include loans that are 90 days past due, on nonaccrual status, have a charge-off, or obligor bankruptcy. Input reversion is used for all loan segment models, except for the commercial and industrial and CRE, owner-occupied loan segments. Output reversion is used for the commercial and industrial and CRE, owner-occupied loan segments by incorporating, after the forecast period, a one-year linear reversion to the long-term reversion rate in year three through the remaining life of the loans within the respective segments. LGDs are typically derived from the Company's historical loss experience. However, for the residential, warehouse lending, and municipal and nonprofit loan segments, where the Company has either zero (or near zero) losses, or has a limited loss history through the last economic downturn, certain non-modeled methodologies are employed to estimate LGD. Factors utilized in calculating average LGD vary for each loan segment and are further described below. Exposure at default refers to the Company's exposure to loss at the time of borrower default. For revolving lines of credit, the Company incorporates an expectation of increased line utilization for a higher EAD on defaulted loans based on historical experience. For term loans, EAD is calculated using an amortization schedule based on contractual loan terms, adjusted for a prepayment rate assumption. Prepayment trends are sensitive to interest rates and the macroeconomic environment. Fixed rate loans are more influenced by interest rates, whereas variable rate loans are more influenced by the macroeconomic environment. After the quantitative expected loss estimates are calculated, management then adjusts these estimates to incorporate considerations of current trends and conditions that are not captured in the quantitative loss estimates, through the use of qualitative and/or environmental factors.

The following provides credit quality indicators and risk elements most relevant in monitoring and measuring the allowance for credit losses on loans for each of the loan portfolio segments identified:

Warehouse lending

The warehouse lending portfolio segment consists of mortgage warehouse lines, MSR financing facilities, and note finance loans, which have a monitored borrowing base to mortgage companies and similar lenders and are primarily structured as commercial and industrial loans. The collateral for these loans is primarily comprised of residential whole loans and MSRs, with the borrowing base of these loans tightly monitored and controlled by the Company. The primary support for these loans takes the form of pledged collateral, with secondary support provided by the capacity of the financial institution. The collateral-driven nature of these loans distinguish them from traditional commercial and industrial loans. These loans are impacted by interest rate shocks, residential lending rates, prepayment assumptions, and general real estate stress. As a result of the unique loan characteristics, limited historical default and loss experience, and the collateral nature of this loan portfolio segment, the Company uses a non-modeled approach to estimate expected credit losses, leveraging grade information, grade migration history, and management judgment.

Municipal and nonprofit

The municipal and nonprofit portfolio segment consists of loans to local governments, government-operated utilities, special assessment districts, hospitals, schools and other nonprofits. These loans are generally, but not exclusively, entered into for the purpose of financing real estate investment or for refinancing existing debt and are primarily structured as commercial and industrial loans. Loans are supported by taxes or utility fees, and in some cases tax liens on real estate, operating revenue of the institution, or other collateral support the loans. While unemployment rates and the market valuation of residential properties have an effect on the tax revenues supporting these loans, these loans tend to be less cyclical in comparison to similar commercial loans due to reliance on diversified tax bases. The Company uses a non-modeled approach to estimate expected credit losses for this portfolio segment, leveraging grade information and historical municipal default rates.

Tech & innovation

The tech & innovation portfolio segment is comprised of commercial loans that are originated within this business line and are not collateralized by real estate. The source of repayment of these loans is generally expected to be the income that is generated from the business. Expected credit losses for this loan segment are estimated using both a vendor model and an internally-developed model. These models incorporate market level and company-specific factors such as financial statement variables, adjusted for the current stage of the credit cycle and for the Company's loan performance data such as delinquency, utilization, maturity, and size of the loan commitment under specific macroeconomic scenarios to produce a probability of default. Macroeconomic variables include the Dow Jones Index, credit spread between the BBB Bond Yield and 10-Year Treasury Bond Yield, unemployment rate, and CBOE VIX Index quarterly high. LGD and the prepayment rate assumption for EAD for this loan segment are driven by unemployment levels.

Equity fund resources

The equity fund resources portfolio segment is comprised of commercial loans to private equity and venture capital funds. The primary source of repayment of these loans is typically uncalled capital commitments from institutional investors and high net worth individuals. The Company uses a non-modeled approach to estimate expected credit losses for this portfolio segment, leveraging loan grade information.

Other commercial and industrial

The other commercial and industrial segment is comprised of commercial and industrial loans that are not originated within the Company's specialty business lines and are not collateralized by real estate. The models used to estimate expected credit losses for this loan segment are the same as those used for the tech & innovation portfolio segment.

Commercial real estate, owner-occupied

The CRE, owner-occupied portfolio segment is comprised of commercial loans that are collateralized by real estate, where the borrower has a business that occupies the property. These loans are typically entered into for the purpose of providing real estate finance or improvement. The primary source of repayment of these loans is the income generated by the business and where rental or sale of the property may provide secondary support for the loan. These loans are sensitive to general economic conditions as well as the market valuation of CRE properties. The probability of default estimate for this loan segment is modeled using the same model as the commercial and industrial loan segment. LGD for this loan segment is driven by property appreciation and the prepayment rate assumption for EAD is driven by unemployment levels.

Hotel franchise finance

The hotel franchise finance segment is comprised of loans that are originated within this business line and are collateralized by real estate, where the owner is not the primary tenant. These loans are typically entered into for the purpose of financing or the improvement of commercial investment properties. The primary source of repayment of these loans are the rents paid by tenants and where the sale of the property may provide secondary support for the loan. These loans are sensitive to the market valuation of CRE properties, rental rates, and general economic conditions. The vendor model used to estimate expected credit losses for this loan segment projects probabilities of default and exposure at default based on multiple macroeconomic scenarios by modeling how macroeconomic conditions affect the commercial real estate market. Real estate market factors utilized in this model include vacancy rate, rental growth rate, net operating income growth rate, and commercial property price changes for each specific property type. The model then incorporates loan and property-level characteristics including debt coverage, leverage, collateral size, seasoning, and property type. LGD for this loan segment is derived from a non-modeled approach that is driven by property appreciation and the prepayment rate assumption for EAD is driven by the property appreciation for fixed rate loans and unemployment levels for variable rate loans.

Other commercial real estate, non-owner occupied

The other commercial real estate, non-owner occupied segment is comprised of loans that are collateralized by real estate, where the owner is not the primary tenant but are not originated within the Company's specialty business lines. The model used to estimate expected credit losses for this loan segment is the same as the model used for the hotel franchise finance portfolio segment.

Residential

The residential loan portfolio segment is comprised of loans collateralized primarily by first liens on 1-4 residential family properties and home equity lines of credit that are collateralized by either first liens or junior liens on residential properties. The primary source of repayment of these loans is the value of the property and the capacity of the owner to make payments on the loan. Unemployment rates and the market valuation of residential properties will impact the ultimate repayment of these loans. The residential mortgage loan model is a vendor model that projects probability of default, loss given default severity, prepayment rate, and exposure at default to calculate expected losses. The model is intended to capture the borrower's payment behavior during the lifetime of the residential loan by incorporating loan level characteristics such as loan type, coupon, age, loan-to-value, and credit score and economic conditions such as Home Price Index, interest rate, and unemployment rate. A default event for residential loans is defined as 60 days or more past due, with property appreciation as the driver for LGD results. The prepayment rate assumption for exposure at default for residential loans is based on industry prepayment history.

Probability of default for HELOCs is derived from an internally-developed model that projects PD by incorporating loan level information such as delinquency status, loan term, and FICO score and macroeconomic conditions such as property appreciation. LGD for this loan segment is driven by property appreciation and lien position. Exposure at default for HELOCs is calculated based on utilization rate assumptions using a non-modeled approach and also incorporates management judgment.

Construction and land development

The construction and land portfolio segment is comprised of loans collateralized by land or real estate, which are entered into for the purpose of real estate development. The primary source of repayment of these loans is the eventual sale or refinance of the completed project and where claims on the property provide secondary support for the loan. These loans are impacted by the market valuation of CRE and residential properties and general economic conditions that have a higher sensitivity to real estate markets compared to other real estate loans. Default risk of a property is driven by loan-specific drivers, including loan-to-value, maturity, origination date, and the MSA in which the property is located, among other items. The variables used in the internally-developed model include loan level drivers such as origination loan-to-value, loan maturity, and macroeconomic drivers such as property appreciation, MSA level unemployment rate, and national GDP growth. LGD for this loan segment is driven by property appreciation. The prepayment rate assumption for EAD is driven by the property appreciation for fixed rate loans and unemployment levels for variable rate loans.

Other

The other portfolio consists of loans not already captured in one of the aforementioned loan portfolio segments, which include, but may not be limited to, overdraft lines for treasury services, credit cards, consumer loans not collateralized by real estate, and small business loans collateralized by residential real estate. The consumer and small business loans are supported by the capacity of the borrower and the valuation of any collateral. General economic factors such as unemployment will have an effect on these loans. The Company uses a non-modeled approach to estimate expected credit losses, leveraging average historical default rates. LGD for this loan segment is driven by unemployment levels and lien position. The prepayment rate assumption for EAD is driven by the BBB corporate spread for fixed rate loans and unemployment levels for variable rate loans.

Lessee, Leases [Policy Text Block]

Leases (lessee)

At inception, contracts are evaluated to determine whether the contract constitutes a lease agreement. For contracts that are determined to be an operating lease, a corresponding ROU asset and operating lease liability are recorded in separate line items on the Consolidated Balance Sheet. A ROU asset represents the Company’s right to use an underlying asset during the lease term and a lease liability represents the Company’s commitment to make contractually obligated lease payments. Operating lease ROU assets and liabilities are recognized at the commencement date of the lease and are based on the present value of lease payments over the lease term. The measurement of the operating lease ROU asset includes any lease payments made and is reduced by lease incentives that are paid or are payable to the Company. Variable lease payments that depend on an index or rate such as the Consumer Price Index are included in lease payments based on the rate in effect at the commencement date of the lease. Lease payments are recognized on a straight-line basis over the lease term as part of Occupancy expense in the Consolidated Income Statements.

As the rate implicit in the lease is not readily determinable, the Company's incremental collateralized borrowing rate is used to determine the present value of lease payments. This rate gives consideration to the applicable FHLB collateralized borrowing rates and is based on the information available at the commencement date. The Company has elected to apply the short-term lease measurement and recognition exemption to leases with an initial term of 12 months or less; therefore, these leases are not recorded on the Company’s Consolidated Balance Sheet, but rather, lease expense is recognized over the lease term on a straight-line basis. The Company’s lease agreements may include options to extend or terminate the lease. These options are included in the lease term when it is reasonably certain that the options will be exercised.

The Company also made an accounting policy election to not separate non-lease components from the associated lease component, and instead account for them together as part of the applicable lease component. The majority of the Company’s non-lease components such as common area maintenance, parking, and taxes are variable, and are expensed as incurred. Variable payment amounts are determined in arrears by the landlord depending on actual costs incurred.

Goodwill and Other Intangible Assets

Goodwill and other intangible assets

The Company records as goodwill the excess of the purchase price in a business combination over the fair value of the identifiable net assets acquired in accordance with applicable guidance. The Company performs its annual goodwill and intangibles impairment tests as of October 1 each year, or more often if events or circumstances indicate that the carrying value may not be recoverable. The Company can first elect to assess, through qualitative factors, whether it is more likely than not that goodwill is impaired. If the qualitative assessment indicates potential impairment, a quantitative impairment test is performed. If, based on the quantitative test, a reporting unit's carrying amount exceeds its fair value, a goodwill impairment charge for this difference is recorded to current period earnings as part of non-interest expense.

The Company’s intangible assets consist of correspondent relationships, operating licenses, tradenames, core deposit intangibles, customer relationships, and developed technology assets that are being amortized over periods of five to 40 years, with the exception of the Bridge Bank tradename which has an indefinite life. See "Note 2. Mergers, Acquisitions and

Dispositions" of these Notes to Unaudited Consolidated Financial Statements for discussion of the intangible assets acquired as part of the AmeriHome and Digital Disbursements acquisitions.

The Company considers the remaining useful lives of its intangible assets each reporting period, as required by ASC 350, Intangibles—Goodwill and Other, to determine whether events and circumstances warrant a revision to the remaining period of amortization. If the estimate of an intangible asset’s remaining useful life has changed, the remaining carrying amount of the intangible asset is amortized prospectively over the revised remaining useful life. The Company has not revised its estimates of the useful lives of its intangible assets during the three months ended March 31, 2022 or 2021.

Stockholders' Equity, Policy

Stock compensation plans

The Company has an incentive plan that gives the BOD the authority to grant stock awards, consisting of unrestricted stock, stock units, dividend equivalent rights, stock options (incentive and non-qualified), stock appreciation rights, restricted stock, and performance and annual incentive awards. Compensation expense on non-vested restricted stock awards is based on the fair value of the award on the measurement date which, for the Company, is the date of the grant and is recognized ratably over the service period of the award. Forfeitures are estimated at the time of the award grant and revised in subsequent periods if actual forfeitures differ from those estimates. The fair value of non-vested restricted stock awards is the market price of the Company’s stock on the date of grant.

The Company's performance stock units have a cumulative EPS target and a TSR performance measure component. The TSR component is a market-based performance condition that is separately valued as of the date of the grant. A Monte Carlo valuation model is used to determine the fair value of the TSR performance metric, which simulates potential TSR outcomes over the performance period and determines the payouts that would occur in each scenario. The resulting fair value of the TSR component is based on the average of these results. Compensation expense related to the TSR component is based on the fair value determination on the date of the grant and is not subsequently revised based on actual performance. Compensation expense related to the EPS component for these awards is based on the fair value (market price of the Company's stock on the date of the grant) of the award. Compensation expense related to both the TSR and EPS components is recognized ratably over the service period of the award.

See "Note 9. Stockholders' Equity" of these Notes to Unaudited Consolidated Financial Statements for further discussion of stock awards.

Dividends

WAL is a legal entity separate and distinct from its subsidiaries. As a holding company with limited significant assets other than the capital stock of its subsidiaries, WAL's ability to pay dividends depends primarily upon the receipt of dividends or other capital distributions from its subsidiaries. The Company's subsidiaries' ability to pay dividends to WAL is subject to, among other things, their individual earnings, financial condition, and need for funds, as well as federal and state governmental policies and regulations applicable to WAL and each of those subsidiaries, which limit the amount that may be paid as dividends without prior approval. In addition, the terms and conditions of other securities the Company issues may restrict its ability to pay dividends to holders of the Company's common stock. For example, if any required payments on outstanding trust preferred securities are not made, WAL would be prohibited from paying cash dividends on its common stock.

Preferred stock

On September 22, 2021, the Company issued an aggregate of 12,000,000 depositary shares, 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). The Company's Series A preferred stock is perpetual preferred stock that is not subject to any mandatory redemption, resulting in classification as permanent equity. Dividends on preferred stock are recognized on the declaration date and are recorded as a reduction of retained earnings.

Treasury shares

The Company separately presents treasury shares, which 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. Treasury shares are carried at cost.

Sales of common stock under ATM program

The Company has a distribution agency agreement with J.P. Morgan Securities LLC and Piper Sandler & Co., under which the Company may sell up to 6,132,670 shares of its common stock on the NYSE. The Company pays the distribution agents a mutually agreed rate, not to exceed 2% of the gross offering proceeds of the shares sold pursuant to the distribution agency agreement. The common stock is sold at prevailing market prices at the time of the sale or at negotiated prices and, as a result, prices will vary. Any 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). See "Note 9. Stockholders' Equity" of these Notes to Unaudited Consolidated Financial Statements for further discussion of this program.

Derivative Financial Instruments

Derivative financial instruments

The Company uses interest rate swaps to mitigate interest-rate risk associated with changes to the fair value of certain fixed-rate financial instruments (fair value hedges).

The Company recognizes derivatives as assets or liabilities on the Consolidated Balance Sheet at their fair value in accordance with ASC 815, Derivatives and Hedging. The accounting for changes in the fair value of a derivative instrument depends on whether it has been designated and qualifies as part of a hedging relationship and further, on the type of hedging relationship. Derivative instruments designated in a hedge relationship to mitigate exposure to changes in the fair value of an asset or liability attributable to a particular risk, such as interest rate risk, are considered fair value hedges.

The Company documents its hedge relationships, including identification of the hedging instruments and the hedged items, as well as its risk management objectives and strategies for undertaking the hedge transaction after the derivative contract is executed. At inception, the Company performs a quantitative assessment to determine whether the derivatives used in hedging transactions are highly effective (as defined in the guidance) in offsetting changes in the fair value of the hedged item. Retroactive effectiveness is assessed, as well as the continued expectation that the hedge will remain effective prospectively. After the initial quantitative assessment is performed, on a quarterly basis, the Company performs a qualitative hedge effectiveness assessment. This assessment takes into consideration any adverse developments related to the counterparty's risk of default and any negative events or circumstances that affect the factors that originally enabled the Company to assess that it could reasonably support, qualitatively, an expectation that the hedging relationship was and will continue to be highly effective. The Company discontinues hedge accounting prospectively when it is determined that a hedge is no longer highly effective. When hedge accounting is discontinued on a fair value hedge that no longer qualifies as an effective hedge, the derivative instrument continues to be reported at fair value on the Consolidated Balance Sheet, but the carrying amount of the hedged item is no longer adjusted for future changes in fair value. The adjustment to the carrying amount of the hedged item that existed at the date hedge accounting is discontinued is amortized over the remaining life of the hedged item into earnings.

Changes in the fair value of a derivative that is designated and qualifies as a fair value hedge, along with changes in the fair value of the hedged asset or liability that are attributable to the hedged risk, are recorded in the same line item as the offsetting loss or gain on the related interest rate swaps during the period of change. For loans, the gain or loss on the hedged item is included in interest income and for subordinated debt, the gain or loss on the hedged items is included in interest expense.

Derivative instruments that are not designated as hedges, so called free-standing derivatives, are reported on the Consolidated Balance Sheet at fair value and the changes in fair value are recognized in earnings as non-interest income during the period of change. With the acquisition of AmeriHome, the Company's economic hedging volume has substantially increased. The Company enters into commitments to purchase mortgage loans that will be held for sale. These loan commitments, described as IRLCs, qualify as derivative instruments, except those that are originated rather than purchased, and intended for HFI classification. As of March 31, 2022, all IRLCs qualify as derivative instruments. Changes in fair value associated with changes in interest rates are economically hedged by utilizing forward sale commitments and interest rate futures. These hedging instruments are typically entered into contemporaneously with IRLCs. Loans that have been or will be purchased or originated may be used to satisfy the Company's forward sale commitments. In addition, derivative financial instruments are also used to economically hedge the Company's MSR portfolio. Changes in the fair value of derivative financial instruments that hedge IRLCs and loans HFS are included in Net gain on loan origination and sale activities in the Consolidated Income Statement. Changes in the fair value of derivative financial instruments that hedge MSRs are included in Net loan servicing revenue in the Consolidated Income Statement.

The Company may in the normal course of business purchase a financial instrument or originate a loan that contains an embedded derivative instrument. Upon purchasing the instrument or originating the loan, the Company assesses whether the economic characteristics of the embedded derivative are clearly and closely related to the economic characteristics of the remaining component of the financial instrument (i.e., the host contract) and whether a separate instrument with the same terms as the embedded instrument would meet the definition of a derivative instrument. When it is determined that the embedded

derivative possesses economic characteristics that are not clearly and closely related to the economic characteristics of the host contract and a separate instrument with the same terms would qualify as a derivative instrument, the embedded derivative is separated from the host contract and carried at fair value. However, in cases where the host contract is measured at fair value, with changes in fair value reported in current earnings, or the Company is unable to reliably identify and measure an embedded derivative for separation from its host contract, the entire contract is carried on the Consolidated Balance Sheet at fair value and is not designated as a hedging instrument.

Off-Balance Sheet Instruments

Off-balance sheet instruments

In the ordinary course of business, the Company enters into off-balance sheet financial instrument arrangements consisting of commitments to extend credit and standby letters of credit. Such financial instruments are recorded in the Consolidated Balance Sheets when funded. These off-balance sheet financial instruments impact, to varying degrees, elements of credit risk in excess of amounts recognized on the Consolidated Balance Sheet. Losses could be experienced when the Company is contractually obligated to make a payment under these instruments and must seek repayment from the borrower, which may not be as financially sound in the current period as they were when the commitment was originally made. Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract and, in certain instances, may be unconditionally cancelable. 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 also has off-balance sheet arrangements related to its derivative instruments. Derivative instruments are recognized in the Consolidated Balance Sheets at fair value and their notional values are carried off-balance sheet. See "Note 11. Derivatives and Hedging Activities" of these Notes to Unaudited Consolidated Financial Statements for further discussion.

Fair Values of Financial Instruments

Fair values of financial instruments

The Company uses fair value measurements to record fair value adjustments to certain assets and liabilities. ASC 820, Fair Value Measurement, establishes a framework for measuring fair value and a three-level valuation hierarchy for disclosure of fair value measurement, and also sets forth disclosure requirements for fair value measurements. The valuation hierarchy is based upon the transparency of inputs to the valuation of an asset or liability as of the measurement date. The Company uses various valuation approaches, including market, income, and/or cost approaches. ASC 820 establishes a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that observable inputs be used when available. Observable inputs are inputs that market participants would use in pricing the asset or liability and are developed based on market data obtained from sources independent of the Company. Unobservable inputs are inputs that reflect the Company’s assumptions about the factors market participants would consider in pricing the asset or liability and are developed based on the best information available in the circumstances. The hierarchy is broken down into three levels based on the reliability of inputs, as follows:

•Level 1 - Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities.

•Level 2 - Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. These might include quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (such as interest rates, prepayment speeds, volatilities, etc.) or model-based valuation techniques where all significant assumptions are observable, either directly or indirectly, in the market.

•Level 3 - Valuation is generated from model-based techniques where one or more significant inputs are not observable, either directly or indirectly, in the market. These unobservable assumptions reflect the Company’s own estimates of assumptions that market participants would use in pricing the asset or liability. Valuation techniques may include use of matrix pricing, discounted cash flow models, and similar techniques.

The availability of observable inputs varies based on the nature of the specific financial instrument. To the extent that valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires more judgment. Accordingly, the degree of judgment exercised by the Company in determining fair value is greatest for instruments categorized in Level 3. In certain cases, the inputs used to measure fair value may fall into different levels of the

fair value hierarchy. For disclosure purposes, the lowest level input that is significant to the fair value measurement determines the level in the fair value hierarchy within which the fair value measurement falls in its entirety.

Fair value is a market-based measure considered from the perspective of a market participant who may purchase the asset or assume the liability, rather than an entity-specific measure. When market assumptions are available, ASC 820 requires that the Company consider the assumptions that market participants would use to estimate the fair value of the financial instrument at the measurement date.

ASC 825, Financial Instruments, requires disclosure of fair value information about financial instruments, whether or not recognized in the balance sheet, for which it is practicable to estimate that value.

Management uses its best judgment in estimating the fair value of the Company’s financial instruments; however, there are inherent limitations in any estimation technique. Therefore, for substantially all financial instruments, the fair value estimates presented herein are not necessarily indicative of the amounts the Company could have realized in a sales transaction at March 31, 2022 and December 31, 2021. The estimated fair value amounts for March 31, 2022 and December 31, 2021 have been measured as of period-end, and have not been re-evaluated or updated for purposes of these Unaudited Consolidated Financial Statements subsequent to those dates. As such, the estimated fair values of these financial instruments subsequent to the reporting date may be different than the amounts reported at period-end.

The information in "Note 15. Fair Value Accounting" of these Notes to Unaudited Consolidated Financial Statements should not be interpreted as an estimate of the fair value of the entire Company since a fair value calculation is only required for a limited portion of the Company’s assets and liabilities.

Due to the wide range of valuation techniques and the degree of subjectivity used in making the estimate, comparisons between the Company’s disclosures and those of other companies or banks may not be meaningful.

The following methods and assumptions were used by the Company in estimating the fair value of its financial instruments:

Cash, cash equivalents, and restricted cash

The carrying amounts reported on the Consolidated Balance Sheet for cash and due from banks approximate their fair value.

Investment securities

The fair values of U.S. treasury and certain other debt securities as well as publicly-traded CRA investments and exchange-listed preferred stock are based on quoted market prices and are categorized as Level 1 in the fair value hierarchy.

The fair values of debt securities are primarily determined based on matrix pricing. Matrix pricing is a mathematical technique that utilizes observable market inputs including, yield curves, credit ratings, and prepayment speeds. Fair values determined using matrix pricing are generally categorized as Level 2 in the fair value hierarchy. In addition to matrix pricing, the Company uses other pricing sources, including observed prices on publicly traded securities and dealer quotes, to estimate the fair value of debt securities, which are also categorized as Level 2 in the fair value hierarchy.

Restricted stock

Restricted stock consists of investments in the capital stock of the FRB and the FHLB. As no ready market exists for them, and they have no quoted market value, the fair values of these investments have been categorized as Level 2 in the fair value hierarchy.

Loans HFS

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

The fair value of non-agency loans HFS as well as certain loans that become nonsalable into active markets due to the identification of a defect is determined based on valuation techniques that utilize Level 3 inputs.

Loans HFI

The fair value of loans is estimated based on discounted cash flows using interest rates currently being offered for loans with similar terms to borrowers with similar credit quality and adjustments that the Company believes a market participant would consider in determining fair value based on a third-party independent valuation. As a result, the fair value for loans is categorized as Level 3 in the fair value hierarchy.

Mortgage servicing rights

The fair value of MSRs is estimated using a discounted cash flow model that incorporates assumptions that a market participant would use in estimating the fair value of servicing rights, including, but not limited to, option adjusted spread, conditional prepayment rate, servicing fee rate, and cost to service. As a result, the fair value for MSRs is categorized as Level 3 in the fair value hierarchy.

Accrued interest receivable and payable

The carrying amounts reported on the Consolidated Balance Sheet for accrued interest receivable and payable approximate their fair values.

Derivative financial instruments

All derivatives are recognized on the Consolidated Balance Sheets at fair value. The valuation methodologies used to estimate the fair value of derivative instruments varies by type. Treasury futures and options, Eurodollar futures, and swap futures are measured based on valuation techniques using Level 1 Inputs from exchange-provided daily settlement quotes. Interest rate swaps and forward purchase and sales contracts are measured based on valuation techniques using Level 2 inputs, such as quoted market price, contracted selling price, or market price equivalent. 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 the pull-through rate. The pull-through rate and servicing fee multiple are unobservable inputs based on historical experience.

Deposits

The fair value disclosed for demand and savings deposits is by definition equal to the amount payable on demand at the reporting date (that is, their carrying amount), as these deposits do not have a contractual term. The carrying amount for variable rate deposit accounts approximates their fair value. Fair values for fixed rate certificates of deposit are estimated using a discounted cash flow calculation that applies interest rates currently being offered on certificates to a schedule of aggregated expected monthly maturities on these deposits. The fair value measurement of deposit liabilities is categorized as Level 2 in the fair value hierarchy.

FHLB advances and customer repurchase agreements

The fair values of the Company’s borrowings are estimated using discounted cash flow analyses, based on the market rates for similar types of borrowing arrangements. The carrying value of FHLB advances and customer repurchase agreements approximate their fair values due to their short durations and have been categorized as Level 2 in the fair value hierarchy.

Credit linked notes

The fair value of credit linked notes is based on observable inputs, when available, and as such credit linked notes are categorized as Level 2 liabilities. Because the notes are variable rate debt, the fair value approximates carrying value.

Subordinated debt

The fair value of subordinated debt is based on the market rate for the respective subordinated debt security. Subordinated debt has been categorized as Level 2 in the fair value hierarchy.

Junior subordinated debt

Junior subordinated debt is valued based on a discounted cash flow model which uses the Treasury Bond rates and the 'BB' and 'BBB' rated financial indexes as inputs. Junior subordinated debt has been categorized as Level 3 in the fair value hierarchy.

Income Taxes

Income taxes

The Company is subject to income taxes in the United States and files a consolidated federal income tax return with all of its subsidiaries, with the exception of BW Real Estate, Inc. Deferred income taxes are recorded to reflect the effects of temporary differences between the financial reporting carrying amounts of assets and liabilities and their income tax bases using enacted tax rates that are expected to be in effect when the taxes are actually paid or recovered. As changes in tax laws or rates are enacted, deferred tax assets and liabilities are adjusted through the provision for income taxes.

Net deferred tax assets are recorded to the extent that these assets will more-likely-than-not be realized. In making these determinations, all available positive and negative evidence is considered, including scheduled reversals of deferred tax liabilities, tax planning strategies, projected future taxable income, and recent operating results. If it is determined that deferred income tax assets to be realized in the future are in excess of their net recorded amount, an adjustment to the valuation allowance will be recorded, which will reduce the Company's provision for income taxes.

A tax benefit from an unrecognized tax benefit may be recognized when it is more-likely-than-not that the position will be sustained upon examination, including related appeals or litigation, based on technical merits. Income tax benefits must meet a more-likely-than-not recognition threshold at the effective date to be recognized.

Interest and penalties related to unrecognized tax benefits are recognized as part of the provision for income taxes in the Consolidated Income Statement. Accrued interest and penalties are included in the related tax liability line with other liabilities on the Consolidated Balance Sheet. See "Note 13. Income Taxes" of these Notes to Unaudited Consolidated Financial Statements for further discussion on income taxes.

Revenue from Contract with Customer [Policy Text Block]

Non-interest income

Non-interest income includes revenue associated with mortgage banking and commercial banking activities, investment securities, equity investments, and bank owned life insurance. These non-interest income streams are primarily generated by different types of financial instruments, held by the Company for which there is specific accounting guidance and therefore, are not within the scope of ASC 606, Revenue from Contracts with Customers.

Non-interest income amounts within the scope of ASC 606 include service charges and fees, success fees related to equity investments, debit and credit card interchange fees, and legal settlement services fees. Service charges and fees consist of fees earned from performance of account analysis, general account services, and other deposit account services. These fees are recognized as the related services are provided. Success fees are one-time fees detailed as part of certain loan agreements and are earned immediately upon occurrence of a triggering event. Card income includes fees earned from customer use of debit and credit cards, interchange income from merchants, and international charges. Card income is generally within the scope of ASC 310, Receivables; however, certain processing transactions for merchants, such as interchange fees, are within the scope of ASC 606. The Company generally receives payment for its services during the period or at the time services are provided and, therefore, does not have material contract asset or liability balances at period end. Legal settlement service fees relate to payment services provided for the distribution of funds from legal settlements and are recognized upon transfer of funds to a claimant. See "Note 17. Revenue from Contracts with Customers" of these Notes to Unaudited Consolidated Financial Statements for further details related to the nature and timing of revenue recognition for non-interest income revenue streams within the scope of this standard.

Loans, held for sale

Loans held for sale

The Company began holding loans HFS in connection with the AmeriHome acquisition and continues to purchase and originate loans as part of its mortgage banking business. Loans HFS are reported at fair value or the lower of cost or fair value, depending on the acquisition source. The Company has elected to record loans purchased from correspondent sellers or originated directly to consumers at fair value to more timely reflect the Company's performance. Changes in fair value of loans HFS are reported in current period income as a component of Net gain on loan origination and sale activities in the Consolidated Income Statement. Alternatively, delinquent loans repurchased under the terms of the GNMA MBS program, referred to as EBO loans, are reported at the lower of cost or fair value. For EBO loans, the amount by which cost exceeds fair value is accounted for as a valuation allowance and any changes in the valuation allowance are included in Net gain on loan origination and sale activities in the Consolidated Income Statement.

The Company recognizes a transfer of loans as a sale when it surrenders control over the transferred loans. Control is considered to be surrendered when the transferred loans have been legally isolated from the Company, the transferee has the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred loans, and the Company does not maintain effective control over the transferred loans through either an agreement that entitles or obligates the Company to repurchase or redeem the loans before their maturity or the ability to unilaterally cause the holder to return loans. If the transfer of loans qualifies as a sale, the Company derecognizes such loans. If the transfer of loans does not qualify as a sale, the proceeds from the transfer are accounted for as secured borrowings.

Loan acquisition and origination fees on loans HFS consist of fees earned by the Company for purchasing and originating loans and are recognized at the time the loans are purchased or originated. These fees generally represent flat, per loan fee amounts and are included as part of Net gain on loan origination and sale activities in the Consolidated Income Statement.

Recognition of interest income on non-government guaranteed or insured loans HFS is suspended and accrued unpaid interest receivable is reversed against interest income when loans become 90 days delinquent or when recovery of income and principal becomes doubtful. Loans return to accrual status when the principal and interest become current and it is probable that the amounts are fully collectible. For government guaranteed or insured loans HFS that are 90 days delinquent, the Company continues to recognize interest income at the debenture rate for FHA loans and at the note rate for VA and USDA loans, adjusted for probability of default.

Transfers and Servicing of Financial Assets, Policy

Mortgage servicing rights

The Company acquired MSRs as part of the AmeriHome acquisition and continues to generate new MSRs from its mortgage banking business. When the Company sells mortgage loans in the secondary market and retains the right to service these loans, a servicing right asset is capitalized at the time of sale when the benefits of servicing are deemed to be greater than adequate compensation for performing the servicing activities. MSRs represent the then-current fair value of future net cash flows expected to be realized from performing servicing activities. The Company has elected to subsequently measure MSRs at fair value and report changes in fair value in current period income as a component of Net loan servicing revenue in the Consolidated Income Statement.

The Company may in the ordinary course of business sell MSRs and will recognize, as of the trade date, a gain or loss on the sale equal to the difference between the carrying value of the transferred MSRs and the value of the assets received as consideration. The Company subsequently derecognizes MSRs when substantially all of the risks and rewards of ownership are irrevocably passed to the transferee and any protection provisions retained by the Company are minor and can be reasonably estimated, which typically occurs on the settlement date. Protection provisions are considered to be minor if the obligation created by such provisions is estimated to be no more than 10 percent of the sales price and the Company retains the risk of prepayment for no more than 120 days. The Company records an estimated liability for retained protection provisions as of the trade date and continues to remeasure this liability until settlement, with any changes in the estimated liability recorded in earnings. In addition, fees to transfer loans associated with the sold MSRs to a new servicer are also recorded on the settlement date. Gains or losses on sales of MSRs, net of retained protection provisions, and transfer fees are included in Net loan servicing revenue in the Consolidated Income Statement.

Business Combinations

Business combinations

Business combinations are accounted for under the acquisition method of accounting in accordance with ASC 805, Business Combinations. Under the acquisition method, the acquiring entity in a business combination recognizes all of the acquired assets and assumed liabilities at their estimated fair values as of the date of acquisition. Any excess of the purchase price over the fair value of net assets and other identifiable intangible assets acquired is recorded as goodwill. To the extent the fair value of net assets acquired, including identified intangible assets, exceeds the purchase price, a bargain purchase gain is recognized. Assets acquired and liabilities assumed from contingencies are also recognized at fair value if the fair value can be determined during the measurement period. Results of operations of an acquired business are included in the Consolidated Income Statement from the date of acquisition. Acquisition-related costs, including conversion and restructuring charges, are expensed as incurred.

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Investment Securities (Tables)

3 Months Ended

Mar. 31, 2022

Investments, Debt and Equity Securities [Abstract]

Debt Securities, Held-to-maturity, Allowance for Credit Loss [Table Text Block]

	Three Months Ended March 31, 2022
	Balance, December 31, 2021		Recovery of Credit Losses		Write-offs		Recoveries		Balance, March 31, 2022
	(in millions)
Held-to-maturity debt securities
Tax-exempt	$	5.2	$	(2.0)	$	—	$	—	$	3.2

	Three Months Ended March 31, 2021:
	Balance, December 31, 2020		Provision for Credit Losses		Write-offs		Recoveries		Balance March 31, 2021
	(in millions)
Held-to-maturity debt securities
Tax-exempt	$	6.8	$	2.4	$	—	$	—	$	9.2

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.

Carrying Amounts and Fair Values of Investment Securities

The carrying amounts and fair values of investment securities at March 31, 2022 and December 31, 2021 are summarized as follows:

	March 31, 2022
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)		Fair Value
	(in millions)
Held-to-maturity
Private label residential MBS	$	211.1	$	—	$	(18.9)	$	192.2
Tax-exempt	949.9		18.2		(20.4)		947.7
Total HTM securities	$	1,161.0	$	18.2	$	(39.3)	$	1,139.9
Available-for-sale debt securities
CLO	$	2,061.3	$	1.2	$	(7.2)	$	2,055.3
Commercial MBS issued by GSEs	64.9		0.1		(2.8)		62.2
Corporate debt securities	424.6		1.7		(11.0)		415.3
Private label residential MBS	1,444.0		0.3		(101.1)		1,343.2
Residential MBS issued by GSEs	2,073.8		0.2		(169.0)		1,905.0
Tax-exempt	1,021.7		8.6		(37.4)		992.9
Other	75.2		9.2		(6.1)		78.3
Total AFS debt securities	$	7,165.5	$	21.3	$	(334.6)	$	6,852.2
Equity securities
CRA investments	$	54.1	$	—	$	(1.8)	$	52.3
Preferred stock	111.0		4.9		(3.5)		112.4
Total equity securities	$	165.1	$	4.9	$	(5.3)	$	164.7

	December 31, 2021
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)		Fair Value
	(in millions)
Held-to-maturity
Private label residential MBS	$	216.9	$	—	$	(1.6)	$	215.3
Tax-exempt	890.2		43.2		(2.3)		931.1
Total HTM securities	$	1,107.1	$	43.2	$	(3.9)	$	1,146.4
Available-for-sale debt securities
CLO	$	926.0	$	0.5	$	(0.3)	$	926.2
Commercial MBS issued by GSEs	68.2		0.9		(0.6)		68.5
Corporate debt securities	382.7		9.2		(9.0)		382.9
Private label residential MBS	1,528.7		3.5		(24.2)		1,508.0
Residential MBS issued by GSEs	2,027.5		7.3		(41.4)		1,993.4
Tax-exempt	1,145.1		71.2		(1.2)		1,215.1
U.S. treasury securities	13.0		—		—		13.0
Other	75.3		11.0		(4.6)		81.7
Total AFS debt securities	$	6,166.5	$	103.6	$	(81.3)	$	6,188.8
Equity securities
CRA investments	$	45.1	$	—	$	(0.5)	$	44.6
Preferred stock	107.1		7.7		(0.9)		113.9
Total equity securities	$	152.2	$	7.7	$	(1.4)	$	158.5

Securities with carrying amounts of approximately $1.9 billion and $2.2 billion at March 31, 2022 and December 31, 2021, respectively, were pledged for various purposes as required or permitted by law.

Unrealized Losses and Fair Value of Investment Securities in Continuous Unrealized Loss Position

unrealized loss position at March 31, 2022 and December 31, 2021, aggregated by major security type and length of time in a continuous unrealized loss position: 

	March 31, 2022
	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
CLO	$	6.8	$	1,101.8	$	0.4	$	63.2	$	7.2	$	1,165.0
Commercial MBS issued by GSEs	1.2		28.6		1.6		17.1		2.8		45.7
Corporate debt securities	11.0		346.3		—		—		11.0		346.3
Private label residential MBS	68.0		1,015.1		33.1		300.1		101.1		1,315.2
Residential MBS issued by GSEs	77.5		1,148.0		91.5		726.8		169.0		1,874.8
Tax-exempt	37.4		677.2		—		—		37.4		677.2
Other	1.6		15.4		4.5		27.5		6.1		42.9
Total AFS securities	$	203.5	$	4,332.4	$	131.1	$	1,134.7	$	334.6	$	5,467.1

	December 31, 2021
	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
CLO	$	0.3	$	170.7	$	—	$	—	$	0.3	$	170.7
Commercial MBS issued by GSEs	0.6		19.5		—		—		0.6		19.5
Corporate debt securities	9.0		107.0		—		—		9.0		107.0
Private label residential MBS	24.2		1,250.0		—		—		24.2		1,250.0
Residential MBS issued by GSEs	32.6		1,355.7		8.8		142.1		41.4		1,497.8
Tax-exempt	1.2		141.4		—		—		1.2		141.4
Other	—		2.0		4.6		27.4		4.6		29.4
Total AFS securities	$	67.9	$	3,046.3	$	13.4	$	169.5	$	81.3	$	3,215.8

Amortized Cost and Fair Value of Investment Securities by Contractual Maturities

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, 2022 the Company does 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, 2022, 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, 2022
	Amortized Cost		Estimated Fair Value
	(in millions)
Held-to-maturity
Due in one year or less	$	41.6	$	41.7
After one year through five years	18.2		18.0
After five years through ten years	7.2		7.5
After ten years	882.9		880.5
Mortgage-backed securities	211.1		192.2
Total HTM securities	$	1,161.0	$	1,139.9
Available-for-sale
Due in one year or less	$	1.5	$	1.5
After one year through five years	120.6		117.9
After five years through ten years	1,055.7		1,046.1
After ten years	2,405.0		2,376.3
Mortgage-backed securities	3,582.7		3,310.4
Total AFS securities	$	7,165.5	$	6,852.2

Investment Securities by Credit Rating Type

The following tables summarize the carrying amount of the Company’s investment ratings position as of March 31, 2022 and December 31, 2021, which are updated quarterly and used to monitor the credit quality of the Company's securities: 

	March 31, 2022
	AAA		Split-rated AAA/AA+		AA+ to AA-		A+ to A-		BBB+ to BBB-		BB+ and below		Unrated		Totals
	(in millions)
Held-to-maturity
Private label residential MBS	$	—	$	—	$	—	$	—	$	—	$	—	$	211.1	$	211.1
Tax-exempt	—		—		—		—		—		—		949.9		949.9
Total HTM securities (1)	$	—	$	—	$	—	$	—	$	—	$	—	$	1,161.0	$	1,161.0
Available-for-sale debt securities
CLO	$	123.5	$	—	$	1,676.1	$	255.7	$	—	$	—	$	—	$	2,055.3
Commercial MBS issued by GSEs	—		62.2		—		—		—		—		—		62.2
Corporate debt securities	—		—		—		48.0		367.3		—		—		415.3
Private label residential MBS	1,261.3		—		81.0		—		0.8		—		0.1		1,343.2
Residential MBS issued by GSEs	—		1,905.0		—		—		—		—		—		1,905.0
Tax-exempt	17.7		16.6		443.3		482.3		—		—		33.0		992.9
Other	—		—		10.8		9.8		30.1		8.5		19.1		78.3
Total AFS securities (1)	$	1,402.5	$	1,983.8	$	2,211.2	$	795.8	$	398.2	$	8.5	$	52.2	$	6,852.2
Equity securities
CRA investments	$	—	$	26.2	$	—	$	—	$	—	$	—	$	26.1	$	52.3
Preferred stock	—		—		—		—		78.0		19.2		15.2		112.4
Total equity securities (1)	$	—	$	26.2	$	—	$	—	$	78.0	$	19.2	$	41.3	$	164.7

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

	December 31, 2021
	AAA		Split-rated AAA/AA+		AA+ to AA-		A+ to A-		BBB+ to BBB-		BB+ and below		Unrated		Totals
	(in millions)
Held-to-maturity
Private label residential MBS	$	—	$	—	$	—	$	—	$	—	$	—	$	216.9	$	216.9
Tax-exempt	—		—		—		—		—		—		890.2		890.2
Total HTM securities (1)	$	—	$	—	$	—	$	—	$	—	$	—	$	1,107.1	$	1,107.1
Available-for-sale debt securities
CLO	$	45.0	$	—	$	635.6	$	245.6	$	—	$	—	$	—	$	926.2
Commercial MBS issued by GSEs	—		68.5		—		—		—		—		—		68.5
Corporate debt securities	—		—		—		45.3		318.7		18.9		—		382.9
Private label residential MBS	1,419.6		—		87.4		—		0.9		—		0.1		1,508.0
Residential MBS issued by GSEs	—		1,993.4		—		—		—		—		—		1,993.4
Tax-exempt	43.2		40.4		469.1		628.9		—		—		33.5		1,215.1
U.S. treasury securities	—		13.0		—		—		—		—		—		13.0
Other	—		—		12.1		10.0		30.2		9.6		19.8		81.7
Total AFS securities (1)	$	1,507.8	$	2,115.3	$	1,204.2	$	929.8	$	349.8	$	28.5	$	53.4	$	6,188.8
Equity securities
CRA investments	$	—	$	27.3	$	—	$	—	$	—	$	—	$	17.3	$	44.6
Preferred stock	—		—		—		—		79.3		20.2		14.4		113.9
Total equity securities (1)	$	—	$	27.3	$	—	$	—	$	79.3	$	20.2	$	31.7	$	158.5

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

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Loans, Leases and Allowance for Credit Losses (Tables)

3 Months Ended

Mar. 31, 2022

Receivables [Abstract]

Financing Receivable, Troubled Debt Restructuring [Table Text Block]

The following table presents TDR loans:

	March 31, 2022			December 31, 2021
	Number of Loans	Recorded Investment		Number of Loans	Recorded Investment
	(dollars in millions)
Tech & innovation	1	$	4.1	2	$	2.1
Other commercial and industrial	7	5.9		7	6.2
CRE - owner occupied	1	0.5		1	0.5
Other CRE - non-owner occupied	5	10.7		5	11.0
Construction and land development	1	1.0		1	1.0
Total	15	$	22.2	16	$	20.8

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, 2022		December 31, 2021
	(in millions)
Warehouse lending	$	4,530.2	$	5,155.9
Municipal & nonprofit	1,497.0		1,579.2
Tech & innovation	1,538.5		1,417.8
Equity fund resources	3,688.5		3,829.8
Other commercial and industrial	6,752.5		6,465.7
CRE - owner occupied	1,635.7		1,723.7
Hotel franchise finance	2,694.7		2,534.0
Other CRE - non-owner occupied	4,115.1		3,951.8
Residential	11,234.9		9,242.8
Construction and land development	3,264.4		3,005.8
Other	167.6		168.9
Total loans HFI	41,119.1		39,075.4
Allowance for credit losses	(257.6)		(252.5)
Total loans HFI, net of allowance	$	40,861.5	$	38,822.9

Contractual Aging of Loan Portfolio by Class of Loans Including Loans Held for Sale and Excluding Deferred Fees/Costs

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

	March 31, 2022
	Current		30-59 Days Past Due		60-89 Days Past Due		Over 90 days Past Due		Total Past Due		Total
	(in millions)
Warehouse lending	$	4,530.2	$	—	$	—	$	—	$	—	$	4,530.2
Municipal & nonprofit	1,497.0		—		—		—		—		1,497.0
Tech & innovation	1,538.5		—		—		—		—		1,538.5
Equity fund resources	3,688.5		—		—		—		—		3,688.5
Other commercial and industrial	6,742.5		9.8		0.2		—		10.0		6,752.5
CRE - owner occupied	1,635.7		—		—		—		—		1,635.7
Hotel franchise finance	2,694.7		—		—		—		—		2,694.7
Other CRE - non-owner occupied	4,109.9		5.2		—		—		5.2		4,115.1
Residential	11,194.7		31.6		8.6		—		40.2		11,234.9
Construction and land development	3,262.4		2.0		—		—		2.0		3,264.4
Other	167.4		0.2		—		—		0.2		167.6
Total loans	$	41,061.5	$	48.8	$	8.8	$	—	$	57.6	$	41,119.1

	December 31, 2021
	Current		30-59 Days Past Due		60-89 Days Past Due		Over 90 days Past Due		Total Past Due		Total
	(in millions)
Warehouse lending	$	5,155.9	$	—	$	—	$	—	$	—	$	5,155.9
Municipal & nonprofit	1,579.2		—		—		—		—		1,579.2
Tech & innovation	1,417.8		—		—		—		—		1,417.8
Equity fund resources	3,829.8		—		—		—		—		3,829.8
Other commercial and industrial	6,465.7		—		—		—		—		6,465.7
CRE - owner occupied	1,723.7		—		—		—		—		1,723.7
Hotel franchise finance	2,534.0		—		—		—		—		2,534.0
Other CRE - non-owner occupied	3,951.8		—		—		—		—		3,951.8
Residential	9,190.4		50.7		1.7		—		52.4		9,242.8
Construction and land development	3,005.8		—		—		—		—		3,005.8
Other	168.8		0.1		—		—		0.1		168.9
Total loans	$	39,022.9	$	50.8	$	1.7	$	—	$	52.5	$	39,075.4

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, 2022
	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)
Tech & innovation	$	—	$	18.1	$	18.1	$	—
Other commercial and industrial	10.4		2.0		12.4		—
CRE - owner occupied	8.3		2.2		10.5		—
Hotel franchise finance	—		10.2		10.2		—
Other CRE - non-owner occupied	12.5		1.2		13.7		—
Residential	—		22.6		22.6		—
Construction and land development	3.3		—		3.3		—
Other	0.2		—		0.2		—
Total	$	34.7	$	56.3	$	91.0	$	—

Loans by Risk Rating

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 risk rating categories are described in "Note 1. Summary of Significant Accounting Policies" of these Notes to Unaudited Consolidated Financial Statements. 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
March 31, 2022	2022		2021		2020		2019		2018		Prior
	(in millions)
Warehouse lending
Pass	$	—	$	223.6	$	31.4	$	—	$	—	$	—	$	4,275.2	$	4,530.2
Special mention	—		—		—		—		—		—		—		—
Classified	—		—		—		—		—		—		—		—
Total	$	—	$	223.6	$	31.4	$	—	$	—	$	—	$	4,275.2	$	4,530.2
Municipal & nonprofit
Pass	$	5.0	$	141.0	$	194.1	$	74.4	$	50.1	$	1,022.8	$	3.6	$	1,491.0
Special mention	—		—		—		6.0		—		—		—		6.0
Classified	—		—		—		—		—		—		—		—
Total	$	5.0	$	141.0	$	194.1	$	80.4	$	50.1	$	1,022.8	$	3.6	$	1,497.0
Tech & innovation
Pass	$	122.9	$	752.4	$	118.8	$	92.7	$	5.6	$	0.6	$	383.6	$	1,476.6
Special mention	7.0		8.4		3.5		1.5		—		—		14.4		34.8
Classified	—		2.5		15.7		5.4		—		—		3.5		27.1
Total	$	129.9	$	763.3	$	138.0	$	99.6	$	5.6	$	0.6	$	401.5	$	1,538.5
Equity fund resources
Pass	$	—	$	13.6	$	—	$	—	$	0.3	$	1.9	$	3,672.7	$	3,688.5
Special mention	—		—		—		—		—		—		—		—
Classified	—		—		—		—		—		—		—		—
Total	$	—	$	13.6	$	—	$	—	$	0.3	$	1.9	$	3,672.7	$	3,688.5
Other commercial and industrial
Pass	$	826.1	$	2,400.9	$	306.4	$	334.6	$	198.5	$	170.2	$	2,408.2	$	6,644.9
Special mention	3.3		5.8		19.1		20.2		17.4		—		12.6		78.4
Classified	0.3		0.8		13.2		7.0		1.6		1.4		4.9		29.2
Total	$	829.7	$	2,407.5	$	338.7	$	361.8	$	217.5	$	171.6	$	2,425.7	$	6,752.5
CRE - owner occupied
Pass	$	56.4	$	377.4	$	195.8	$	190.1	$	190.5	$	539.8	$	55.7	$	1,605.7
Special mention	0.4		—		—		0.2		—		—		—		0.6
Classified	7.6		2.2		2.6		—		5.5		11.5		—		29.4
Total	$	64.4	$	379.6	$	198.4	$	190.3	$	196.0	$	551.3	$	55.7	$	1,635.7
Hotel franchise finance
Pass	$	238.3	$	697.0	$	144.7	$	584.8	$	352.0	$	197.6	$	123.0	$	2,337.4
Special mention	—		—		41.8		132.1		—		—		—		173.9
Classified	8.6		20.3		—		98.9		45.4		10.2		—		183.4
Total	$	246.9	$	717.3	$	186.5	$	815.8	$	397.4	$	207.8	$	123.0	$	2,694.7
Other CRE - non-owner occupied
Pass	$	445.2	$	1,324.8	$	720.5	$	592.0	$	215.1	$	421.6	$	313.8	$	4,033.0
Special mention	—		19.7		—		21.6		—		5.7		—		47.0
Classified	—		—		10.8		4.1		4.3		15.9		—		35.1
Total	$	445.2	$	1,344.5	$	731.3	$	617.7	$	219.4	$	443.2	$	313.8	$	4,115.1

	Term Loan Amortized Cost Basis by Origination Year												Revolving Loans Amortized Cost Basis		Total
March 31, 2022	2022		2021		2020		2019		2018		Prior
	(in millions)
Residential
Pass	$	1,127.6	$	8,469.1	$	957.4	$	351.8	$	171.4	$	101.1	$	33.9	$	11,212.3
Special mention	—		—		—		—		—		—		—		—
Classified	—		15.1		0.6		3.8		0.5		2.6		—		22.6
Total	$	1,127.6	$	8,484.2	$	958.0	$	355.6	$	171.9	$	103.7	$	33.9	$	11,234.9
Construction and land development
Pass	$	297.7	$	1,065.0	$	622.9	$	245.1	$	73.5	$	3.2	$	931.5	$	3,238.9
Special mention	—		—		9.0		—		—		—		—		9.0
Classified	—		1.0		12.6		0.6		—		—		2.3		16.5
Total	$	297.7	$	1,066.0	$	644.5	$	245.7	$	73.5	$	3.2	$	933.8	$	3,264.4
Other
Pass	$	1.9	$	15.5	$	8.3	$	3.6	$	4.1	$	83.6	$	49.9	$	166.9
Special mention	—		—		—		—		—		0.2		—		0.2
Classified	—		—		—		0.1		0.1		0.3		—		0.5
Total	$	1.9	$	15.5	$	8.3	$	3.7	$	4.2	$	84.1	$	49.9	$	167.6
Total by Risk Category
Pass	$	3,121.1	$	15,480.3	$	3,300.3	$	2,469.1	$	1,261.1	$	2,542.4	$	12,251.1	$	40,425.4
Special mention	10.7		33.9		73.4		181.6		17.4		5.9		27.0		349.9
Classified	16.5		41.9		55.5		119.9		57.4		41.9		10.7		343.8
Total	$	3,148.3	$	15,556.1	$	3,429.2	$	2,770.6	$	1,335.9	$	2,590.2	$	12,288.8	$	41,119.1

	Term Loan Amortized Cost Basis by Origination Year												Revolving Loans Amortized Cost Basis		Total
December 31, 2021	2021		2020		2019		2018		2017		Prior
	(in millions)
Warehouse lending
Pass	$	242.6	$	12.5	$	—	$	—	$	—	$	—	$	4,900.8	$	5,155.9
Special mention	—		—		—		—		—		—		—		—
Classified	—		—		—		—		—		—		—		—
Total	$	242.6	$	12.5	$	—	$	—	$	—	$	—	$	4,900.8	$	5,155.9
Municipal & nonprofit
Pass	$	129.5	$	195.0	$	101.2	$	52.9	$	219.3	$	877.8	$	3.5	$	1,579.2
Special mention	—		—		—		—		—		—		—		—
Classified	—		—		—		—		—		—		—		—
Total	$	129.5	$	195.0	$	101.2	$	52.9	$	219.3	$	877.8	$	3.5	$	1,579.2
Tech & innovation
Pass	$	762.6	$	157.1	$	101.1	$	6.1	$	—	$	0.6	$	334.4	$	1,361.9
Special mention	26.0		4.7		—		—		—		—		8.1		38.8
Classified	3.0		5.2		7.5		—		—		—		1.4		17.1
Total	$	791.6	$	167.0	$	108.6	$	6.1	$	—	$	0.6	$	343.9	$	1,417.8
Equity fund resources
Pass	$	9.0	$	1.7	$	—	$	0.3	$	2.2	$	0.2	$	3,816.4	$	3,829.8
Special mention	—		—		—		—		—		—		—		—
Classified	—		—		—		—		—		—		—		—
Total	$	9.0	$	1.7	$	—	$	0.3	$	2.2	$	0.2	$	3,816.4	$	3,829.8
Other commercial and industrial
Pass	$	2,910.8	$	360.0	$	387.1	$	210.3	$	80.2	$	97.8	$	2,306.0	$	6,352.2
Special mention	5.4		26.7		22.0		17.6		0.1		—		15.0		86.8
Classified	—		10.1		5.6		2.2		1.4		0.2		7.2		26.7
Total	$	2,916.2	$	396.8	$	414.7	$	230.1	$	81.7	$	98.0	$	2,328.2	$	6,465.7

	Term Loan Amortized Cost Basis by Origination Year												Revolving Loans Amortized Cost Basis		Total
December 31, 2021	2021		2020		2019		2018		2017		Prior
	(in millions)
CRE - owner occupied
Pass	$	417.2	$	198.5	$	220.1	$	190.4	$	278.0	$	322.4	$	55.6	$	1,682.2
Special mention	—		—		0.3		10.1		—		1.5		0.4		12.3
Classified	2.2		2.6		1.0		4.6		8.0		10.7		0.1		29.2
Total	$	419.4	$	201.1	$	221.4	$	205.1	$	286.0	$	334.6	$	56.1	$	1,723.7
Hotel franchise finance
Pass	$	721.3	$	205.3	$	658.8	$	332.2	$	135.5	$	63.5	$	123.0	$	2,239.6
Special mention	—		—		87.6		51.1		—		—		—		138.7
Classified	30.3		—		99.2		15.9		10.3		—		—		155.7
Total	$	751.6	$	205.3	$	845.6	$	399.2	$	145.8	$	63.5	$	123.0	$	2,534.0
Other CRE - non-owner occupied
Pass	$	1,398.2	$	754.8	$	673.0	$	278.8	$	185.8	$	283.5	$	315.1	$	3,889.2
Special mention	14.8		—		9.8		—		—		1.7		—		26.3
Classified	—		—		4.2		4.5		0.3		16.4		10.9		36.3
Total	$	1,413.0	$	754.8	$	687.0	$	283.3	$	186.1	$	301.6	$	326.0	$	3,951.8
Residential
Pass	$	7,459.3	$	1,018.4	$	395.5	$	201.3	$	41.6	$	75.5	$	36.1	$	9,227.7
Special mention	—		—		—		—		—		—		—		—
Classified	8.9		0.9		3.6		0.5		0.1		1.1		—		15.1
Total	$	7,468.2	$	1,019.3	$	399.1	$	201.8	$	41.7	$	76.6	$	36.1	$	9,242.8
Construction and land development
Pass	$	957.6	$	632.3	$	394.0	$	112.2	$	3.5	$	0.1	$	869.8	$	2,969.5
Special mention	—		22.5		—		—		5.6		—		—		28.1
Classified	1.0		4.3		0.6		—		—		—		2.3		8.2
Total	$	958.6	$	659.1	$	394.6	$	112.2	$	9.1	$	0.1	$	872.1	$	3,005.8
Other
Pass	$	15.7	$	11.6	$	3.7	$	4.3	$	4.4	$	82.0	$	46.4	$	168.1
Special mention	—		—		—		—		—		0.1		—		0.1
Classified	—		—		0.1		0.1		—		0.5		—		0.7
Total	$	15.7	$	11.6	$	3.8	$	4.4	$	4.4	$	82.6	$	46.4	$	168.9
Total by Risk Category
Pass	$	15,023.8	$	3,547.2	$	2,934.5	$	1,388.8	$	950.5	$	1,803.4	$	12,807.1	$	38,455.3
Special mention	46.2		53.9		119.7		78.8		5.7		3.3		23.5		331.1
Classified	45.4		23.1		121.8		27.8		20.1		28.9		21.9		289.0
Total	$	15,115.4	$	3,624.2	$	3,176.0	$	1,495.4	$	976.3	$	1,835.6	$	12,852.5	$	39,075.4

Allowances for Credit Losses

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

	Three Months Ended March 31, 2022
	Balance, December 31, 2021		Provision for (Recovery of) Credit Losses		Write-offs		Recoveries		Balance, March 31, 2022
	(in millions)
Warehouse lending	$	3.0	$	(0.1)	$	—	$	—	$	2.9
Municipal & nonprofit	13.7		(0.3)		—		—		13.4
Tech & innovation	25.7		0.3		—		(2.0)		28.0
Equity fund resources	9.6		(3.0)		—		—		6.6
Other commercial and industrial	103.6		14.3		2.6		(0.4)		115.7
CRE - owner occupied	10.6		(2.5)		—		—		8.1
Hotel franchise finance	41.5		(10.9)		—		—		30.6
Other CRE - non-owner occupied	16.9		(1.6)		—		—		15.3
Residential	12.5		11.3		—		—		23.8
Construction and land development	12.5		(1.8)		—		—		10.7
Other	2.9		(0.4)		—		—		2.5
Total	$	252.5	$	5.3	$	2.6	$	(2.4)	$	257.6

	Three Months Ended March 31, 2021
	Balance, December 31, 2020		Provision for (Recovery of) Credit Losses		Write-offs		Recoveries		Balance, March 31, 2021
	(in millions)
Warehouse lending	$	3.4	$	0.2	$	—	$	—	$	3.6
Municipal & nonprofit	15.9		(0.7)		—		—		15.2
Tech & innovation	33.4		(10.6)		—		(0.2)		23.0
Equity fund resources	1.9		(1.0)		—		—		0.9
Other commercial and industrial	94.7		(16.5)		0.1		(0.3)		78.4
CRE - owner occupied	18.6		(8.9)		—		—		9.7
Hotel franchise finance	43.3		6.1		—		—		49.4
Other CRE - non-owner occupied	39.9		(5.4)		2.0		(0.2)		32.7
Residential	0.8		2.4		—		—		3.2
Construction and land development	22.0		3.9		—		—		25.9
Other	5.0		0.1		—		—		5.1
Total	$	278.9	$	(30.4)	$	2.1	$	(0.7)	$	247.1

Accrued interest receivable on loans totaled $201.1 million and $197.6 million at March 31, 2022 and December 31, 2021, respectively, and is excluded from the estimate of credit losses.

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

The below table reflects the activity in the allowance for credit losses on unfunded loan commitments:

	Three Months Ended March 31,
	2022		2021
	(in millions)
Balance, beginning of period	$	37.6	$	37.0
Provision for (recovery of) credit losses	5.7		(4.4)
Balance, end of period	$	43.3	$	32.6

The following tables disaggregate the Company's allowance for credit losses on funded HFI loans and loan balances by measurement methodology:

	March 31, 2022
	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	$	4,530.2	$	—	$	4,530.2	$	2.9	$	—	$	2.9
Municipal & nonprofit	1,497.0		—		1,497.0		13.4		—		13.4
Tech & innovation	1,511.5		27.0		1,538.5		23.7		4.3		28.0
Equity fund resources	3,688.5		—		3,688.5		6.6		—		6.6
Other commercial and industrial	6,726.5		26.0		6,752.5		112.9		2.8		115.7
CRE - owner occupied	1,609.7		26.0		1,635.7		8.1		—		8.1
Hotel franchise finance	2,511.3		183.4		2,694.7		24.1		6.5		30.6
Other CRE - non-owner occupied	4,081.2		33.9		4,115.1		15.3		—		15.3
Residential	11,234.9		—		11,234.9		23.8		—		23.8
Construction and land development	3,247.9		16.5		3,264.4		10.7		—		10.7
Other	167.3		0.3		167.6		2.5		—		2.5
Total	$	40,806.0	$	313.1	$	41,119.1	$	244.0	$	13.6	$	257.6

	December 31, 2021
	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	$	5,155.9	$	—	$	5,155.9	$	3.0	$	—	$	3.0
Municipal & nonprofit	1,579.2		—		1,579.2		13.7		—		13.7
Tech & innovation	1,400.8		17.0		1,417.8		22.9		2.8		25.7
Equity fund resources	3,829.8		—		3,829.8		9.6		—		9.6
Other commercial and industrial	6,442.7		23.0		6,465.7		101.1		2.5		103.6
CRE - owner occupied	1,699.3		24.4		1,723.7		10.6		—		10.6
Hotel franchise finance	2,378.3		155.7		2,534.0		30.7		10.8		41.5
Other CRE - non-owner occupied	3,917.3		34.5		3,951.8		16.9		—		16.9
Residential	9,242.8		—		9,242.8		12.5		—		12.5
Construction and land development	2,997.6		8.2		3,005.8		12.5		—		12.5
Other	168.6		0.3		168.9		2.9		—		2.9
Total	$	38,812.3	$	263.1	$	39,075.4	$	236.4	$	16.1	$	252.5

XML

Other Borrowings (Tables)

3 Months Ended

Mar. 31, 2022

Debt Disclosure [Abstract]

Company's Borrowings

The following table summarizes the Company’s borrowings as of March 31, 2022 and December 31, 2021: 

	March 31, 2022		December 31, 2021
	(in millions)
Short-Term:
Federal funds purchased	$	—	$	675.0
Customer repurchase agreements	18.0		16.6
Secured borrowings	52.3		35.3
Total short-term borrowings	$	70.3	$	726.9
Long-Term:
AmeriHome senior notes, net of fair value adjustment	$	317.5	$	317.9
Credit linked notes, net of debt issuance costs	445.5		457.1
Total long-term borrowings	$	763.0	$	775.0
Total other borrowings	$	833.3	$	1,501.9

XML

Accumulated Other Comprehensive Income (Tables)

3 Months Ended

Mar. 31, 2022

Equity [Abstract]

Summary of Changes in Accumulated Other Comprehensive Income

	Three Months Ended March 31,
	Unrealized holding gains (losses) on AFS securities		Unrealized holding gains (losses) on SERP		Unrealized holding gains (losses) on junior subordinated debt		Total
	(in millions)
Balance, December 31, 2021	$	16.7	$	(0.3)	$	(0.7)	$	15.7
Other comprehensive (loss) income before reclassifications	(247.9)		—		2.2		(245.7)
Amounts reclassified from AOCI	(5.1)		—		—		(5.1)
Net current-period other comprehensive (loss) income	(253.0)		—		2.2		(250.8)
Balance, March 31, 2022	$	(236.3)	$	(0.3)	$	1.5	$	(235.1)
Balance, December 31, 2020	$	92.1	$	(0.3)	$	0.5	$	92.3
Other comprehensive loss before reclassifications	(72.0)		—		(0.3)		(72.3)
Amounts reclassified from AOCI	(0.1)		—		—		(0.1)
Net current-period other comprehensive loss	(72.1)		—		(0.3)		(72.4)
Balance, March 31, 2021	$	20.0	$	(0.3)	$	0.2	$	19.9

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Derivatives and Hedging (Tables)

3 Months Ended

Mar. 31, 2022

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Instruments in Statement of Financial Position

11. DERIVATIVES AND HEDGING ACTIVITIES

The Company is a party to various derivative instruments, including those derivative instruments assumed from the AmeriHome acquisition. Derivative instruments are contracts between two or more parties that have a notional amount and an underlying variable, require a small or no initial investment, and allow for the net settlement of positions. A derivative’s notional amount serves as the basis for the payment provision of the contract and takes the form of units, such as shares or dollars. A derivative’s underlying variable is a specified interest rate, security price, commodity price, foreign exchange rate, index, or other variable. The interaction between the notional amount and the underlying variable determines the number of units to be exchanged between the parties and influences the fair value of the derivative contract.

The primary types of derivatives that the Company uses are interest rate swaps, 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 Sheets, 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 and volatility of net interest income and EVE to interest rate fluctuations. 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 are based on LIBOR and will convert to SOFR upon the discontinuation of LIBOR in June 2023.

The Company also had pay fixed/receive variable interest rate swaps, designated as fair value hedges using the last-of-layer method to manage the exposure to changes in fair value associated with fixed rate loans, resulting from changes in the designated benchmark interest rate (federal funds rate). These last-of-layer hedges provided 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 is 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. During the year ended December 31, 2021, the Company completed a partial discontinuation of one of its last-of-layer hedges, which reduced the total hedged amount on these hedges from $1.0 billion to $880.0 million. During the three months ended March 31, 2022, the Company discontinued the remaining portion of these last-of-layer hedges. The cumulative basis adjustment on the discontinued last-of-layer hedges totaled $30.6 million, which was allocated across the remaining loan pool upon termination of the hedges and is being amortized over the remaining term.

The Company had a receive fixed/pay variable interest rate swap, designated as a fair value hedge on its $175.0 million subordinated debentures issued on June 16, 2016. This swap was terminated during the year ended December 31, 2021 in connection with the full redemption of the debt. The Company was paying a variable rate of three-month LIBOR plus 3.25% and was receiving quarterly fixed payments of 6.25% to match the payments on the debt.

Derivatives Not Designated in Hedge Relationships

Management enters into certain foreign exchange derivative contracts and back-to-back interest rate swaps 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. Contracts with customers, along with the related derivative trades that 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's back-to-back interest rate swaps are used to allow customers to manage long-term interest rate risk.

As it relates to the Company's mortgage banking business, it also uses derivative financial instruments to manage exposure to interest rate risk 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 and interest rate futures.

Fair Value Hedges

As of March 31, 2022 and December 31, 2021, the following amounts are reflected on the Consolidated Balance Sheets related to cumulative basis adjustments for outstanding fair value hedges:

	March 31, 2022				December 31, 2021
	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)	$	474.0	$	20.7	$	1,390.7	$	38.5

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

(2)As of December 31, 2021, included last-of-layer derivative instruments, with $880 million designated as the hedged amount (from a closed portfolio of prepayable fixed rate loans with a carrying value of $1.4 billion). The cumulative basis adjustment included in the carrying value of these hedged items totaled $15.7 million and the basis adjustment related to the discontinued portion was $1.0 million as of December 31, 2021.

For the Company's derivative instruments that are designated and qualify as a fair value hedge, 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 earnings 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 and for subordinated debt, the gain or loss on the hedged items was included in interest expense, as shown in the table below.

	Three Months Ended March 31,
	2022				2021
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	$	33.5	$	(33.4)	$	38.7	$	(38.7)
Interest expense	—		—		(5.7)		5.7

In addition to the gains and losses on the Company's outstanding fair value hedges presented in the above table, the Company recognized $1.0 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, 2022.

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, 2022, December 31, 2021, and March 31, 2021. The change in the notional amounts of these derivatives from March 31, 2021 to March 31, 2022 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, 2022						December 31, 2021						March 31, 2021
			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 swaps (1)	$	498.5	$	1.7	$	22.7	$	1,382.8	$	13.8	$	54.5	$	1,685.9	$	7.9	$	57.7
Total	498.5		1.7		22.7		1,382.8		13.8		54.5		1,685.9		7.9		57.7
Derivatives not designated as hedging instruments (2):
Foreign currency contracts	$	151.9	$	0.4	$	1.6	$	180.1	$	0.2	$	1.4	$	119.3	$	1.0	$	0.7
Forward purchase contracts	5,018.8		4.1		64.7		11,713.5		8.1		18.0		—		—		—
Forward sales contracts	9,557.0		149.3		6.4		17,358.5		15.8		17.7		—		—		—
Futures purchase contracts (3)	202,818.0		—		—		218,053.7		—		—		—		—		—
Futures sales contracts (3)	219,617.0		—		—		229,040.0		—		—		—		—		—
Interest rate lock commitments	2,419.6		5.8		17.2		3,033.2		11.0		1.6		—		—		—
Interest rate swaps	64.1		0.3		0.3		4.1		0.1		0.1		3.5		0.2		0.2
Total	$	439,646.4	$	159.9	$	90.2	$	479,383.1	$	35.2	$	38.8	$	122.8	$	1.2	$	0.9
Margin			0.1		64.9				1.2		6.5				—		—
Total, including margin	$	439,646.4	$	160.0	$	155.1	$	479,383.1	$	36.4	$	45.3	$	122.8	$	1.2	$	0.9

(1)Interest rate swap amounts include a notional amount of $880 million and $1.0 billion related to the last-of-layer hedges at December 31, 2021 and March 31, 2021, respectively.

(2)Relate to economic hedging arrangements.

(3)The Company enters into forward purchase and sales contracts that are subject to daily remargining and almost all of which, are based on three-month LIBOR to hedge against its MSR valuation exposure. The notional amount on these contracts is substantial as these contracts have a duration of only 0.25 years and are intended to cover the longer duration of MSR hedges.

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 Sheets, as summarized in the table below:

	March 31, 2022						December 31, 2021						March 31, 2021
	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
Forward purchase contracts	$	3.6	$	—	$	3.6	$	7.9	$	—	$	7.9	$	—	$	—	$	—
Forward sales contracts	148.8		—		148.8		15.5		—		15.5		—		—		—
Interest rate swaps	1.7		—		1.7		13.8		—		13.8		7.9		—		7.9
Margin	0.1		—		0.1		1.2		—		1.2		—		—		—
Netting	—		(130.0)		(130.0)		—		(28.4)		(28.4)		—		—		—
	$	154.2	$	(130.0)	$	24.2	$	38.4	$	(28.4)	$	10.0	$	7.9	$	—	$	7.9
Liabilities
Forward purchase contracts	$	(64.4)	$	—	$	(64.4)	$	(17.7)	$	—	$	(17.7)	$	—	$	—	$	—
Forward sales contracts	(6.2)		—		(6.2)		(17.6)		—		(17.6)		—		—		—
Interest rate swaps	(22.7)		—		(22.7)		(54.5)		—		(54.5)		(57.7)		—		(57.7)
Margin	(64.9)		—		(64.9)		(6.5)		—		(6.5)		—		—		—
Netting	—		130.0		130.0		—		28.4		28.4		—		—		—
	$	(158.2)	$	130.0	$	(28.2)	$	(96.3)	$	28.4	$	(67.9)	$	(57.7)	$	—	$	(57.7)
Derivatives not subject to master netting arrangements:
Assets
Foreign currency contracts	$	0.4	$	—	$	0.4	$	0.2	$	—	$	0.2	$	1.0	$	—	$	1.0
Forward purchase contracts	0.5		—		0.5		0.2		—		0.2		—		—		—
Forward sales contracts	0.5		—		0.5		0.3		—		0.3		—		—		—
Interest rate lock commitments	5.8		—		5.8		11.0		—		11.0		—		—		—
Interest rate swaps	0.3		—		0.3		0.1		—		0.1		0.2		—		0.2
	$	7.5	$	—	$	7.5	$	11.8	$	—	$	11.8	$	1.2	$	—	$	1.2
Liabilities
Foreign currency contracts	$	(1.6)	$	—	$	(1.6)	$	(1.4)	$	—	$	(1.4)	$	(0.7)	$	—	$	(0.7)
Forward purchase contracts	(0.3)		—		(0.3)		(0.3)		—		(0.3)		—		—		—
Forward sales contracts	(0.2)		—		(0.2)		(0.1)		—		(0.1)		—		—		—
Interest rate lock commitments	(17.2)		—		(17.2)		(1.6)		—		(1.6)		—		—		—
Interest rate swaps	(0.3)		—		(0.3)		(0.1)		—		(0.1)		(0.2)		—		(0.2)
	$	(19.6)	$	—	$	(19.6)	$	(3.5)	$	—	$	(3.5)	$	(0.9)	$	—	$	(0.9)
Total derivatives and margin
Assets	$	161.7	$	(130.0)	$	31.7	$	50.2	$	(28.4)	$	21.8	$	9.1	$	—	$	9.1
Liabilities	$	(177.8)	$	130.0	$	(47.8)	$	(99.8)	$	28.4	$	(71.4)	$	(58.6)	$	—	$	(58.6)

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

	Three Months Ended March 31, 2022
	($ in millions)
Net gain (loss) on loan origination and sale activities:
Interest rate lock commitments	$	(20.8)
Forward contracts	241.3
Other contracts	(3.7)
Total gain	$	216.8
Net loan servicing revenue:
Forward contracts	$	(34.9)
Options contracts	—
Futures contracts	(22.0)
Total loss	$	(56.9)

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, such as GNMA, FNMA, and FHLMC. The total collateral pledged by the Company to counterparties for its derivatives designated as hedging instruments totaled $45.0 million, $67.1 million, and $93.2 million as of March 31, 2022, December 31, 2021, and March 31, 2021, respectively.

Schedule of Derivative Assets at Fair Value

As of March 31, 2022 and December 31, 2021, the following amounts are reflected on the Consolidated Balance Sheets related to cumulative basis adjustments for outstanding fair value hedges:

	March 31, 2022				December 31, 2021
	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)	$	474.0	$	20.7	$	1,390.7	$	38.5

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

(2)As of December 31, 2021, included last-of-layer derivative instruments, with $880 million designated as the hedged amount (from a closed portfolio of prepayable fixed rate loans with a carrying value of $1.4 billion). The cumulative basis adjustment included in the carrying value of these hedged items totaled $15.7 million and the basis adjustment related to the discontinued portion was $1.0 million as of December 31, 2021.

Derivative Instruments, Gain (Loss)

For the Company's derivative instruments that are designated and qualify as a fair value hedge, 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 earnings 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 and for subordinated debt, the gain or loss on the hedged items was included in interest expense, as shown in the table below.

	Three Months Ended March 31,
	2022				2021
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	$	33.5	$	(33.4)	$	38.7	$	(38.7)
Interest expense	—		—		(5.7)		5.7

In addition to the gains and losses on the Company's outstanding fair value hedges presented in the above table, the Company recognized $1.0 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, 2022.

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Earnings per Share (Tables)

3 Months Ended

Mar. 31, 2022

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,
	2022		2021
	(in millions, except per share amounts)
Weighted average shares - basic	106.0		100.8
Dilutive effect of stock awards	0.6		0.6
Weighted average shares - diluted	106.6		101.4
Net income available to common stockholders	$	236.9	$	192.5
Earnings per share - basic	2.23		1.91
Earnings per share - diluted	2.22		1.90

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Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2022

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, 2022		December 31, 2021
	(in millions)
Commitments to extend credit, including unsecured loan commitments of $1,205.2 at March 31, 2022 and $1,199.8 at December 31, 2021	$	14,884.8	$	13,396.3
Credit card commitments and financial guarantees	319.2		306.3
Letters of credit, including unsecured letters of credit of $2.6 at March 31, 2022 and $12.9 at December 31, 2021	201.8		198.1
Total	$	15,405.8	$	13,900.7

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Fair Value Accounting (Tables)

3 Months Ended

Mar. 31, 2022

Fair Value Disclosures [Abstract]

Gains and Losses from Fair Value Changes Included in Consolidated Statement of Operations

For the three months ended March 31, 2022 and 2021, unrealized gains and losses from fair value changes on junior subordinated debt were as follows:

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 as of the periods presented: 

	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
	(in millions)
March 31, 2022
Assets:
Available-for-sale debt securities
CLO	$	—	$	2,055.3	$	—	$	2,055.3
Commercial MBS issued by GSEs	—		62.2		—		62.2
Corporate debt securities	—		415.3		—		415.3
Private label residential MBS	—		1,343.2		—		1,343.2
Residential MBS issued by GSEs	—		1,905.0		—		1,905.0
Tax-exempt	—		992.9		—		992.9
Other	27.4		50.9		—		78.3
Total AFS debt securities	$	27.4	$	6,824.8	$	—	$	6,852.2
Equity securities
CRA investments	$	26.2	$	26.1	$	—	$	52.3
Preferred stock	112.4		—		—		112.4
Total equity securities	$	138.6	$	26.1	$	—	$	164.7
Loans HFS	$	—	$	2,940.5	$	7.9	$	2,948.4
Mortgage servicing rights	—		—		950.3		950.3
Derivative assets (1)	—		155.9		5.8		161.7
Liabilities:
Junior subordinated debt (2)	$	—	$	—	$	64.5	$	64.5
Derivative liabilities (1)	—		160.6		17.2		177.8

(1)See "Note 11. Derivatives and Hedging Activities." In addition, the carrying value of loans is increased by $20.7 million as of March 31, 2022 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.

(2)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
	(in millions)
December 31, 2021
Assets:
Available-for-sale debt securities
CLO	$	—	$	926.2	$	—	$	926.2
Commercial MBS issued by GSEs	—		68.5		—		68.5
Corporate debt securities	—		382.9		—		382.9
Private label residential MBS	—		1,508.0		—		1,508.0
Residential MBS issued by GSEs	—		1,993.4		—		1,993.4
Tax-exempt	—		1,215.1		—		1,215.1
U.S. treasury securities	13.0		—		—		13.0
Other	27.4		54.3		—		81.7
Total AFS debt securities	$	40.4	$	6,148.4	$	—	$	6,188.8
Equity securities
CRA investments	$	27.4	$	17.2	$	—	$	44.6
Preferred stock	113.9		—		—		113.9
Total equity securities	$	141.3	$	17.2	$	—	$	158.5
Loans - HFS	$	—	$	3,894.2	$	45.5	$	3,939.7
Mortgage servicing rights	—		—		698.0		698.0
Derivative assets (1)	—		39.2		11.0		50.2
Liabilities:
Junior subordinated debt (2)	$	—	$	—	$	67.4	$	67.4
Derivative liabilities (1)	—		98.2		1.6		99.8

(1)See "Note 11. Derivatives and Hedging Activities." In addition, the carrying value of loans is increased by $38.5 million as of December 31, 2021 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.

(2)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

For the three months ended March 31, 2022 and 2021, 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,
	2022		2021
	(in millions)
Beginning balance	$	(67.4)	$	(65.9)
Change in fair value (1)	2.9		(0.4)
Ending balance	$	(64.5)	$	(66.3)

Assets Measured at Fair Value on Nonrecurring Basis

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, 2022:
Loans HFI	$	259.6	$	—	$	—	$	259.6
Other assets acquired through foreclosure	11.7		—		—		11.7
As of December 31, 2021:
Loans HFI	$	216.0	$	—	$	—	$	216.0
Other assets acquired through foreclosure	11.7		—		—		11.7

Estimated Fair Value of Financial Instruments

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

	March 31, 2022
	Carrying Amount		Fair Value
			Level 1		Level 2		Level 3		Total
	(in millions)
Financial assets:
Investment securities:
HTM	$	1,161.0	$	—	$	1,139.9	$	—	$	1,139.9
AFS	6,852.2		27.4		6,824.8		—		6,852.2
Equity	164.7		138.6		26.1		—		164.7
Derivative assets	161.7		—		155.9		5.8		161.7
Loans HFS	4,761.6		—		2,940.5		1,828.3		4,768.8
Loans HFI, net	40,861.5		—		—		41,030.6		41,030.6
Mortgage servicing rights	950.3		—		—		950.3		950.3
Accrued interest receivable	235.6		—		235.6		—		235.6
Financial liabilities:
Deposits	$	52,159.5	$	—	$	52,162.7	$	—	$	52,162.7
Other borrowings	833.3		—		798.2		—		798.2
Qualifying debt	893.3		—		808.7		77.8		886.5
Derivative liabilities	177.8		—		160.6		17.2		177.8
Accrued interest payable	13.5		—		13.5		—		13.5

	December 31, 2021
	Carrying Amount		Fair Value
			Level 1		Level 2		Level 3		Total
	(in millions)
Financial assets:
Investment securities:
HTM	$	1,107.1	$	—	$	1,146.4	$	—	$	1,146.4
AFS	6,188.8		40.4		6,148.4		—		6,188.8
Equity securities	158.5		141.3		17.2		—		158.5
Derivative assets	50.2		—		39.2		11.0		50.2
Loans HFS	5,635.1		—		3,894.2		1,760.2		5,654.4
Loans HFI, net	38,822.9		—		—		39,218.2		39,218.2
Mortgage servicing rights	698.0		—		—		698.0		698.0
Accrued interest receivable	227.9		—		227.9		—		227.9
Financial liabilities:
Deposits	$	47,612.0	$	—	$	47,615.5	$	—	$	47,615.5
Other borrowings	1,501.9		—		1,518.4		—		1,518.4
Qualifying debt	895.8		—		857.3		81.3		938.6
Derivative liabilities	99.8		—		98.2		1.6		99.8
Accrued interest payable	9.2		—		9.2		—		9.2

XML

Segments (Tables)

3 Months Ended

Mar. 31, 2022

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, 2022:	(in millions)
Assets:
Cash, cash equivalents, and investment securities	$	10,878.9	$	15.6	$	97.0	$	10,766.3
Loans held for sale	4,761.6		—		4,761.6		—
Loans, net of deferred fees and costs	41,119.1		25,794.8		15,324.3		—
Less: allowance for credit losses	(257.6)		(221.3)		(36.3)		—
Total loans	40,861.5		25,573.5		15,288.0		—
Other assets acquired through foreclosure, net	11.7		11.7		—		—
Goodwill and other intangible assets, net	698.2		294.3		403.9		—
Other assets	3,364.2		253.2		1,594.8		1,516.2
Total assets	$	60,576.1	$	26,148.3	$	22,145.3	$	12,282.5
Liabilities:
Deposits	$	52,159.5	$	30,133.6	$	18,527.6	$	3,498.3
Borrowings and qualifying debt	1,726.6		18.0		369.8		1,338.8
Other liabilities	1,678.4		268.1		170.3		1,240.0
Total liabilities	55,564.5		30,419.7		19,067.7		6,077.1
Allocated equity:	5,011.6		2,661.8		1,752.1		597.7
Total liabilities and stockholders' equity	$	60,576.1	$	33,081.5	$	20,819.8	$	6,674.8
Excess funds provided (used)	—		6,933.2		(1,325.5)		(5,607.7)
Income Statement:
Three Months Ended March 31, 2022:	(in millions)
Net interest income	$	449.5	$	334.9	$	183.2	$	(68.6)
Provision for (recovery of) credit losses	9.0		0.6		10.5		(2.1)
Net interest income (expense) after provision for credit losses	440.5		334.3		172.7		(66.5)
Non-interest income	106.3		16.9		79.2		10.2
Non-interest expense	248.6		114.4		125.0		9.2
Income (loss) before income taxes	298.2		236.8		126.9		(65.5)
Income tax expense (benefit)	58.1		56.2		30.4		(28.5)
Net income (loss)	$	240.1	$	180.6	$	96.5	$	(37.0)

Balance Sheet:	Consolidated Company		Commercial		Consumer Related		Corporate
At December 31, 2021:	(in millions)
Assets:
Cash, cash equivalents, and investment securities	$	8,057.3	$	12.9	$	82.4	$	7,962.0
Loans held for sale	5,635.1		—		5,635.1		—
Loans, net of deferred fees and costs	39,075.4		25,092.4		13,983.0		—
Less: allowance for credit losses	(252.5)		(226.0)		(26.5)		—
Total loans	38,822.9		24,866.4		13,956.5		—
Other assets acquired through foreclosure, net	11.7		11.7		—		—
Goodwill and other intangible assets, net	634.8		294.7		340.1		—
Other assets	2,820.8		253.8		1,278.1		1,288.9
Total assets	$	55,982.6	$	25,439.5	$	21,292.2	$	9,250.9
Liabilities:
Deposits	$	47,612.0	$	30,466.8	$	15,362.9	$	1,782.3
Borrowings and qualifying debt	2,381.1		—		353.2		2,027.9
Other liabilities	1,026.9		233.4		138.2		655.3
Total liabilities	51,020.0		30,700.2		15,854.3		4,465.5
Allocated equity:	4,962.6		2,588.0		1,596.2		778.4
Total liabilities and stockholders' equity	$	55,982.6	$	33,288.2	$	17,450.5	$	5,243.9
Excess funds provided (used)	—		7,848.7		(3,841.7)		(4,007.0)
Income Statements:
Three Months Ended March 31, 2021:	(in millions)
Net interest income	$	317.3	$	263.7	$	107.9	$	(54.3)
Provision for (recovery of) credit losses	(32.4)		(36.3)		1.7		2.2
Net interest income (expense) after provision for credit losses	349.7		300.0		106.2		(56.5)
Non-interest income	19.7		19.2		0.5		—
Non-interest expense	135.0		98.3		35.2		1.5
Income (loss) before income taxes	234.4		220.9		71.5		(58.0)
Income tax expense (benefit)	41.9		52.7		17.5		(28.3)
Net income (loss)	$	192.5	$	168.2	$	54.0	$	(29.7)

XML

Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($) Subsidiary	Dec. 31, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Significant Of Accounting Policies [Line Items]
Number Of Wholly Owned Subsidiaries Non Bank Subsidiaries | Subsidiary	2
Number Of Unconsolidated Subsidiaries | Subsidiary	8
Debt Securities, Held-to-maturity, Allowance for Credit Loss	$ 3.2	$ 5.2	$ 9.2	$ 6.8
Loans and Leases Receivable, Allowance	257.6	252.5
Deferred Income Tax Assets, Net	67.6	20.9
Off-Balance Sheet, Credit Loss, Liability	43.3	37.6	$ 32.6	$ 37.0
Retained earnings	$ (2,972.6)	$ (2,773.0)

XML

Business Combinations (Details) - USD ($) $ in Millions			3 Months Ended		12 Months Ended
	Jan. 25, 2022	Apr. 07, 2021	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Business Combinations [Abstract]
Business Acquisition, Effective Date of Acquisition	Jan. 25, 2022	Apr. 07, 2021
Business Combination, Consideration Transferred			$ 67.8	$ 1,918.4
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 27.5	$ 141.0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Eligible for Repurchase		2,744.7
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	0.6	207.2
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Held for Sale		3,552.9
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Servicing Assets		1,347.0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment		11.3
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Operating Right of use Asset		18.9
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets		6.6
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	0.1	236.0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	28.2	8,265.6
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt		3,633.9
Business Combination, Recognized Identifiable Asset Acquired and Liability Assumed, Lease Obligation		18.9
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liability for Loans Eligible for Repurchase		2,744.7
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other	0.4	149.5
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	0.4	6,547.0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	27.8	1,718.6
Payments to Acquire Businesses, Gross			50.6	1,231.6	$ 1,200.0
Goodwill	$ 40.0	$ 199.8
Business Acquisition, Effective Date of Acquisition	Jan. 25, 2022	Apr. 07, 2021
Business Combination, Consideration Transferred			67.8	1,918.4
Business Combination, Elimination of Pre-existing debt and other		$ 686.8
Business Acquisition, Pro Forma Revenue			353.3
Business Acquisition, Pro Forma Non-interest Income			89.6
Business Acquisition, Pro Forma Net Income (Loss)			180.2
Acquisition and restructure expenses			$ 0.4	$ 0.4
Business Acquisition, Goodwill, Expected Tax Deductible Amount		$ 185.0
Business Combination, Contingent Consideration, Liability	$ 17.2

XML

Investment Securities - Carrying Amounts and Fair Values of Investment Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2022		Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	$ 164,700	[1]	$ 158,500	[2]
Debt Securities, Held-to-maturity	1,161,000		1,107,100
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	18,200		43,200
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(39,300)		(3,900)
Debt Securities, Held-to-maturity, Fair Value	1,139,900		1,146,400
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	334,600		81,300
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	21,300		103,600
Debt Securities, Available-for-sale	6,852,200	[1]	6,188,800	[2]
Securities available for sale Total, Amortized Cost	7,165,500		6,166,500
Equity Securities, FV-NI, Cost	165,100		152,200
Equity Securities, FV-NI, Unrealized Gain	4,900		7,700
Equity Securities, FV-NI, Unrealized Loss	5,300		1,400
Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	2,800		600
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	100		900
Debt Securities, Available-for-sale	62,200		68,500
Securities available for sale Total, Amortized Cost	64,900		68,200
Corporate Bond Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	11,000		9,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,700		9,200
Debt Securities, Available-for-sale	415,300		382,900
Securities available for sale Total, Amortized Cost	424,600		382,700
Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity	211,100		216,900
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0		0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(18,900)		(1,600)
Debt Securities, Held-to-maturity, Fair Value	192,200		215,300
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	101,100		24,200
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	300		3,500
Debt Securities, Available-for-sale	1,343,200		1,508,000
Securities available for sale Total, Amortized Cost	1,444,000		1,528,700
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	169,000		41,400
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	200		7,300
Debt Securities, Available-for-sale	1,905,000		1,993,400
Securities available for sale Total, Amortized Cost	2,073,800		2,027,500
Nontaxable Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity	949,900		890,200
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	18,200		43,200
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(20,400)		(2,300)
Debt Securities, Held-to-maturity, Fair Value	947,700		931,100
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	37,400		1,200
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	8,600		71,200
Debt Securities, Available-for-sale	992,900		1,215,100
Securities available for sale Total, Amortized Cost	1,021,700		1,145,100
US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax			0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax			0
Debt Securities, Available-for-sale			13,000
Securities available for sale Total, Amortized Cost			13,000
CRA investments [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	52,300		44,600
Equity Securities, FV-NI, Cost	54,100		45,100
Equity Securities, FV-NI, Unrealized Gain	0		0
Equity Securities, FV-NI, Unrealized Loss	1,800		500
Preferred Stock [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	112,400		113,900
Equity Securities, FV-NI, Cost	111,000		107,100
Equity Securities, FV-NI, Unrealized Gain	4,900		7,700
Equity Securities, FV-NI, Unrealized Loss	3,500		900
Collateralized Loan Obligations
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	7,200		300
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,200		500
Debt Securities, Available-for-sale	2,055,300		926,200
Securities available for sale Total, Amortized Cost	2,061,300		926,000
Other Security Investments
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	6,100		4,600
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	9,200		11,000
Debt Securities, Available-for-sale	78,300		81,700
Securities available for sale Total, Amortized Cost	75,200		75,300
AAA [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	0	[1]	0	[2]
Debt Securities, Held-to-maturity	0
Debt Securities, Available-for-sale	1,402,500	[1]	1,507,800	[2]
AAA [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	0		0
AAA [Member] | Corporate Bond Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	0		0
AAA [Member] | Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity	0		0
Debt Securities, Available-for-sale	1,261,300		1,419,600
AAA [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	0		0
AAA [Member] | Nontaxable Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity	0		0
Debt Securities, Available-for-sale	17,700		43,200
AAA [Member] | US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale			0
AAA [Member] | CRA investments [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	0		0
AAA [Member] | Preferred Stock [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	0		0
AAA [Member] | Collateralized Loan Obligations
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	123,500		45,000
AAA [Member] | Other Security Investments
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	0		0
Split-rated AAA/AA Plus [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	26,200	[1]	27,300	[2]
Debt Securities, Held-to-maturity	0
Debt Securities, Available-for-sale	1,983,800	[1]	2,115,300	[2]
Split-rated AAA/AA Plus [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	62,200		68,500
Split-rated AAA/AA Plus [Member] | Corporate Bond Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	0		0
Split-rated AAA/AA Plus [Member] | Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity	0		0
Debt Securities, Available-for-sale	0		0
Split-rated AAA/AA Plus [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	1,905,000		1,993,400
Split-rated AAA/AA Plus [Member] | Nontaxable Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity	0		0
Debt Securities, Available-for-sale	16,600		40,400
Split-rated AAA/AA Plus [Member] | US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale			13,000
Split-rated AAA/AA Plus [Member] | CRA investments [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	26,200		27,300
Split-rated AAA/AA Plus [Member] | Preferred Stock [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	0		0
Split-rated AAA/AA Plus [Member] | Collateralized Loan Obligations
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	0		0
Split-rated AAA/AA Plus [Member] | Other Security Investments
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	0		0
AA Plus to AA- [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	0	[1]	0	[2]
Debt Securities, Held-to-maturity	0
Debt Securities, Available-for-sale	2,211,200	[1]	1,204,200	[2]
AA Plus to AA- [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	0		0
AA Plus to AA- [Member] | Corporate Bond Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	0		0
AA Plus to AA- [Member] | Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity	0		0
Debt Securities, Available-for-sale	81,000		87,400
AA Plus to AA- [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	0		0
AA Plus to AA- [Member] | Nontaxable Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity	0		0
Debt Securities, Available-for-sale	443,300		469,100
AA Plus to AA- [Member] | US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale			0
AA Plus to AA- [Member] | CRA investments [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	0		0
AA Plus to AA- [Member] | Preferred Stock [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	0		0
AA Plus to AA- [Member] | Collateralized Loan Obligations
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	1,676,100		635,600
AA Plus to AA- [Member] | Other Security Investments
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	10,800		12,100
A Plus to A- [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	0	[1]	0	[2]
Debt Securities, Held-to-maturity	0
Debt Securities, Available-for-sale	795,800	[1]	929,800	[2]
A Plus to A- [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	0		0
A Plus to A- [Member] | Corporate Bond Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	48,000		45,300
A Plus to A- [Member] | Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity	0		0
Debt Securities, Available-for-sale	0		0
A Plus to A- [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	0		0
A Plus to A- [Member] | Nontaxable Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity	0		0
Debt Securities, Available-for-sale	482,300		628,900
A Plus to A- [Member] | US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale			0
A Plus to A- [Member] | CRA investments [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	0		0
A Plus to A- [Member] | Preferred Stock [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	0		0
A Plus to A- [Member] | Collateralized Loan Obligations
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	255,700		245,600
A Plus to A- [Member] | Other Security Investments
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	9,800		10,000
BBB Plus to BBB- [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	78,000	[1]	79,300	[2]
Debt Securities, Held-to-maturity	0
Debt Securities, Available-for-sale	398,200	[1]	349,800	[2]
BBB Plus to BBB- [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	0		0
BBB Plus to BBB- [Member] | Corporate Bond Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	367,300		318,700
BBB Plus to BBB- [Member] | Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity	0		0
Debt Securities, Available-for-sale	800		900
BBB Plus to BBB- [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	0		0
BBB Plus to BBB- [Member] | Nontaxable Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity	0		0
Debt Securities, Available-for-sale	0		0
BBB Plus to BBB- [Member] | US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale			0
BBB Plus to BBB- [Member] | CRA investments [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	0		0
BBB Plus to BBB- [Member] | Preferred Stock [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	78,000		79,300
BBB Plus to BBB- [Member] | Collateralized Loan Obligations
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	0		0
BBB Plus to BBB- [Member] | Other Security Investments
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	30,100		30,200
BB Plus and below [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	19,200	[1]	20,200	[2]
Debt Securities, Held-to-maturity	0
Debt Securities, Available-for-sale	8,500	[1]	28,500	[2]
BB Plus and below [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	0		0
BB Plus and below [Member] | Corporate Bond Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	0		18,900
BB Plus and below [Member] | Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity	0		0
Debt Securities, Available-for-sale	0		0
BB Plus and below [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	0		0
BB Plus and below [Member] | Nontaxable Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity	0		0
Debt Securities, Available-for-sale	0		0
BB Plus and below [Member] | US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale			0
BB Plus and below [Member] | CRA investments [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	0		0
BB Plus and below [Member] | Preferred Stock [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	19,200		20,200
BB Plus and below [Member] | Collateralized Loan Obligations
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	0		0
BB Plus and below [Member] | Other Security Investments
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	8,500		9,600
Corporate Credit Quality Indicator Unrated [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	41,300	[1]	31,700	[2]
Debt Securities, Held-to-maturity	1,161,000		1,107,100
Debt Securities, Available-for-sale	52,200	[1]	53,400	[2]
Corporate Credit Quality Indicator Unrated [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	0		0
Corporate Credit Quality Indicator Unrated [Member] | Corporate Bond Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	0		0
Corporate Credit Quality Indicator Unrated [Member] | Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity	211,100		216,900
Debt Securities, Available-for-sale	100		100
Corporate Credit Quality Indicator Unrated [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	0		0
Corporate Credit Quality Indicator Unrated [Member] | Nontaxable Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity	949,900		890,200
Debt Securities, Available-for-sale	33,000		33,500
Corporate Credit Quality Indicator Unrated [Member] | US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale			0
Corporate Credit Quality Indicator Unrated [Member] | CRA investments [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	26,100		17,300
Corporate Credit Quality Indicator Unrated [Member] | Preferred Stock [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	15,200		14,400
Corporate Credit Quality Indicator Unrated [Member] | Collateralized Loan Obligations
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	0		0
Corporate Credit Quality Indicator Unrated [Member] | Other Security Investments
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	$ 19,100		$ 19,800

[1] ratings differ, the Company uses an average of the available ratings by major credit agencies.

[2] For rated securities, if ratings differ, the Company uses an average of the available ratings by major credit agencies.

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Investment Securities - Additional Information (Detail) $ in Millions	Mar. 31, 2022 USD ($) positions	Dec. 31, 2021 USD ($) positions
Pledged Securities [Abstract]
Accrued Investment Income Receivable	$ 3.3	$ 3.0
Pledged Financial Instruments, Not Separately Reported, Other Debt Securities Available-for-sale or Held-for-investment	$ 1,900.0	$ 2,200.0
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | positions	575	179

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Investment Securities - Unrealized Losses and Fair Value of Investment Securities in Continuous Unrealized Loss Position (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) positions	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) positions
Debt Securities, Available-for-sale [Line Items]
Unrealized gains (losses) on assets measured at fair value, net	$ (6,600)	$ (1,500)
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	334,600		$ 81,300
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	131,100		13,400
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	203,500		67,900
Debt Securities, Available-for-sale, Unrealized Loss Position	5,467,100		3,215,800
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,134,700		169,500
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 4,332,400		$ 3,046,300
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | positions	575		179
Corporate Bond Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 11,000		$ 9,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	11,000		9,000
Debt Securities, Available-for-sale, Unrealized Loss Position	346,300		107,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	346,300		107,000
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	169,000		41,400
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	91,500		8,800
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	77,500		32,600
Debt Securities, Available-for-sale, Unrealized Loss Position	1,874,800		1,497,800
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	726,800		142,100
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	1,148,000		1,355,700
Nontaxable Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	37,400		1,200
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	37,400		1,200
Debt Securities, Available-for-sale, Unrealized Loss Position	677,200		141,400
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	677,200		141,400
Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	101,100		24,200
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	33,100		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	68,000		24,200
Debt Securities, Available-for-sale, Unrealized Loss Position	1,315,200		1,250,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	300,100		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	1,015,100		1,250,000
Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	2,800		600
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1,600		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1,200		600
Debt Securities, Available-for-sale, Unrealized Loss Position	45,700		19,500
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	17,100		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	28,600		19,500
Other Security Investments
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	6,100		4,600
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	4,500		4,600
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1,600		0
Debt Securities, Available-for-sale, Unrealized Loss Position	42,900		29,400
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	27,500		27,400
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	15,400		2,000
Collateralized Loan Obligations
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	7,200		300
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	400		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	6,800		300
Debt Securities, Available-for-sale, Unrealized Loss Position	1,165,000		170,700
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	63,200		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 1,101,800		$ 170,700

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Investment Securities - Amortized Cost and Fair Value of Investment Securities by Contractual Maturities (Detail) - USD ($) $ in Millions	Mar. 31, 2022		Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	$ 41.6
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	18.2
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Amortized Cost	882.9
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	41.7
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	18.0
Held-to-maturity Securities, Debt Maturities, Rolling Year Six Through Ten, Fair Value	7.5
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	7.2
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	880.5
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value	192.2
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Amortized Cost	211.1
Debt Securities, Held-to-maturity	1,161.0		$ 1,107.1
Debt Securities, Held-to-maturity, Fair Value	1,139.9		1,146.4
Securities available for sale, Due in one year or less, Amortized Cost	1.5
Securities available for sale, After one year through five years, Amortized Cost	120.6
Securities available for sale, After five years through ten years, Amortized Cost	1,055.7
Securities available for sale, After ten years, Amortized Cost	2,405.0
Securities available for sale, Mortgage backed securities, Amortized Cost	3,582.7
Securities available for sale Total, Amortized Cost	7,165.5		6,166.5
Securities available for sale, Due in one year or less, Estimated Fair Value	1.5
Securities available for sale, After one year through five years, Estimated Fair Value	117.9
Securities available for sale, After five years through ten years, Estimated Fair Value	1,046.1
Securities available for sale, After ten years, Estimated Fair Value	2,376.3
Securities available for sale, Mortgage backed securities, Estimated Fair Value	3,310.4
Securities available for sale Total, Estimated Fair Value	$ 6,852.2	[1]	$ 6,188.8	[2]

[1] ratings differ, the Company uses an average of the available ratings by major credit agencies.

[2] For rated securities, if ratings differ, the Company uses an average of the available ratings by major credit agencies.

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Investment Securities - Investment Securities by Credit Rating Type (Detail) - USD ($) $ in Thousands	Mar. 31, 2022		Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity	$ 1,161,000		$ 1,107,100
Debt Securities, Available-for-sale	6,852,200	[1]	6,188,800	[2]
Investment securities - equity	164,700	[1]	158,500	[2]
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	1,905,000		1,993,400
Nontaxable Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity	949,900		890,200
Debt Securities, Available-for-sale	992,900		1,215,100
Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	62,200		68,500
Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity	211,100		216,900
Debt Securities, Available-for-sale	1,343,200		1,508,000
US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale			13,000
Preferred Stock [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	112,400		113,900
Corporate Bond Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	415,300		382,900
CRA investments [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	52,300		44,600
Other Security Investments
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	78,300		81,700
Collateralized Loan Obligations
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	$ 2,055,300		$ 926,200

[1] ratings differ, the Company uses an average of the available ratings by major credit agencies.

[2] For rated securities, if ratings differ, the Company uses an average of the available ratings by major credit agencies.

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Investment Securities - Gross Gains and (Losses) on Sales of Investments (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($)
Investments, Debt and Equity Securities [Abstract]
Debt Securities, Available-for-sale, Realized Gain (Loss)	$ 6.9

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Investment Securities Investment Securities - Allowance for Credit Losses - HTM (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Debt Securities, Held-to-maturity, Allowance for Credit Loss	$ 3.2	$ 9.2	$ 5.2	$ 6.8
Debt Securities, Held-to-maturity, Allowance for Credit Loss, Period Increase (Decrease)	2.0	2.4
Debt Securities, Held-to-maturity, Allowance for Credit Loss, Writeoff	0.0	0.0
Debt Securities, Held-to-maturity, Allowance for Credit Loss, Recovery	$ 0.0	$ 0.0

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Loans Held For Sale (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Loans and Leases Receivable Disclosure [Line Items]
Loans Receivable Held-for-sale, Amount	$ 4,761.6		$ 5,635.1
Proceeds from Sale of Mortgage Loans Held-for-sale	(336.9)
MSR capitalized upon sale of loan	204.1
Provision for and change in estimate of liability for losses under representations and warranties	0.8
Change in fair value of loans held for sale	(66.2)
Unrealized Gain (Loss) on Derivatives	81.2
Derivative Instruments Not Designated as Hedging Instruments, Gain	135.6
Gain (Loss) on Sales of Loans, Net	18.6
Loan acquisition and origination fees	18.3
Pledged Assets Separately Reported, Loans Pledged as Collateral, at Fair Value	0.0
Net gain on loan origination and sale activities	36.9	$ 0.0
Purchased from Ginnie Mae
Loans and Leases Receivable Disclosure [Line Items]
Loans Receivable Held-for-sale, Amount	1,805.6		1,692.8
Purchased from correspondent seller
Loans and Leases Receivable Disclosure [Line Items]
Loans Receivable Held-for-sale, Amount	1,465.2		1,396.6
Loans Insured or Guaranteed by US Government Authorities
Loans and Leases Receivable Disclosure [Line Items]
Loans Receivable Held-for-sale, Amount	3,270.8		3,089.4
US Government Agency Insured Loans
Loans and Leases Receivable Disclosure [Line Items]
Loans Receivable Held-for-sale, Amount	1,483.6		2,482.9
Non-agency
Loans and Leases Receivable Disclosure [Line Items]
Loans Receivable Held-for-sale, Amount	$ 7.2		$ 62.8

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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, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Net of Deferred Income	$ 41,119.1	$ 39,075.4
Loans and Leases Receivable, Allowance	(257.6)	(252.5)
Loans, net	40,861.5	38,822.9
Net deferred loan fees and costs	(92.5)	(85.7)
Receivable with Imputed Interest, Premium	205.8	184.8
Loans Receivable Held-for-sale, Amount	4,761.6	5,635.1
Tech & Innovation [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,538.5	1,417.8
Other commercial and industrial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Net of Deferred Income	6,752.5	6,465.7
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,635.7	1,723.7
Hotel franchise finance [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Net of Deferred Income	2,694.7	2,534.0
Other Commercial Real Estate Non owner Occupied [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Net of Deferred Income	4,115.1	3,951.8
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Net of Deferred Income	11,234.9	9,242.8
Construction And Land Development Land [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Net of Deferred Income	3,264.4	3,005.8
Warehouse lending [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Net of Deferred Income	4,530.2	5,155.9
Municipal and nonprofit [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,497.0	1,579.2
Other, loan segment
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Net of Deferred Income	167.6	168.9
Equity fund resources
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Net of Deferred Income	$ 3,688.5	$ 3,829.8

XML

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	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No Allowance for Credit Loss	$ 34.7		$ 38.9
Nonaccrual with an Allowance for Credit Loss	56.3		33.7
Total Non-accrual	91.0		72.6
Financing Receivable, 90 Days or More Past Due, Still Accruing	0.0		0.0
Loans Receivable Held-for-sale, Amount	4,761.6		5,635.1
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans	1.1	$ 1.5
Loans and Leases Receivable, Net of Deferred Income	41,119.1		39,075.4
Tech & Innovation [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No Allowance for Credit Loss	0.0		2.1
Nonaccrual with an Allowance for Credit Loss	18.1		11.2
Total Non-accrual	18.1		13.3
Financing Receivable, 90 Days or More Past Due, Still Accruing	0.0		0.0
Loans and Leases Receivable, Net of Deferred Income	1,538.5		1,417.8
Other commercial and industrial [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No Allowance for Credit Loss	10.4		12.7
Nonaccrual with an Allowance for Credit Loss	2.0		3.4
Total Non-accrual	12.4		16.1
Financing Receivable, 90 Days or More Past Due, Still Accruing	0.0		0.0
Loans and Leases Receivable, Net of Deferred Income	6,752.5		6,465.7
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No Allowance for Credit Loss	8.3		11.6
Nonaccrual with an Allowance for Credit Loss	2.2		1.4
Total Non-accrual	10.5		13.0
Financing Receivable, 90 Days or More Past Due, Still Accruing	0.0		0.0
Loans and Leases Receivable, Net of Deferred Income	1,635.7		1,723.7
Hotel franchise finance [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No Allowance for Credit Loss	0.0
Nonaccrual with an Allowance for Credit Loss	10.2
Total Non-accrual	10.2
Financing Receivable, 90 Days or More Past Due, Still Accruing	0.0
Loans and Leases Receivable, Net of Deferred Income	2,694.7		2,534.0
Other Commercial Real Estate Non owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No Allowance for Credit Loss	12.5		11.3
Nonaccrual with an Allowance for Credit Loss	1.2		1.8
Total Non-accrual	13.7		13.1
Financing Receivable, 90 Days or More Past Due, Still Accruing	0.0		0.0
Loans and Leases Receivable, Net of Deferred Income	4,115.1		3,951.8
Residential Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No Allowance for Credit Loss	0.0		0.0
Nonaccrual with an Allowance for Credit Loss	22.6		15.1
Total Non-accrual	22.6		15.1
Financing Receivable, 90 Days or More Past Due, Still Accruing	0.0		0.0
Loans and Leases Receivable, Net of Deferred Income	11,234.9		9,242.8
Construction And Land Development [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No Allowance for Credit Loss	3.3		1.0
Nonaccrual with an Allowance for Credit Loss	0.0		0.0
Total Non-accrual	3.3		1.0
Financing Receivable, 90 Days or More Past Due, Still Accruing	0.0		0.0
Loans and Leases Receivable, Net of Deferred Income	3,264.4		3,005.8
Warehouse lending [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	4,530.2		5,155.9
Municipal and nonprofit [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,497.0		1,579.2
Other, loan segment
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No Allowance for Credit Loss	0.2		0.2
Nonaccrual with an Allowance for Credit Loss	0.0		0.2
Total Non-accrual	0.2		0.4
Financing Receivable, 90 Days or More Past Due, Still Accruing	0.0		0.0
Loans and Leases Receivable, Net of Deferred Income	167.6		168.9
Construction And Land Development Land [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	3,264.4		3,005.8
Equity fund resources
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No Allowance for Credit Loss			0.0
Nonaccrual with an Allowance for Credit Loss			0.6
Total Non-accrual			0.6
Financing Receivable, 90 Days or More Past Due, Still Accruing			0.0
Loans and Leases Receivable, Net of Deferred Income	$ 3,688.5		$ 3,829.8

XML

Contractual Aging of Loan Portfolio by Segment (Detail) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	$ 41,119.1	$ 39,075.4
Financing Receivable, Originated in Current Fiscal Year	3,148.3	15,115.4
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	15,556.1	3,624.2
Financing Receivable, Originated Two Years before Latest Fiscal Year	3,429.2	3,176.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,770.6	1,495.4
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,335.9	976.3
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,590.2	1,835.6
Financing Receivable, Revolving	12,288.8	12,852.5
Financing Receivable, 90 Days or More Past Due, Still Accruing	0.0	0.0
Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	40,425.4	38,455.3
Financing Receivable, Originated in Current Fiscal Year	3,121.1	15,023.8
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	15,480.3	3,547.2
Financing Receivable, Originated Two Years before Latest Fiscal Year	3,300.3	2,934.5
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,469.1	1,388.8
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,261.1	950.5
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,542.4	1,803.4
Financing Receivable, Revolving	12,251.1	12,807.1
Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	349.9	331.1
Financing Receivable, Originated in Current Fiscal Year	10.7	46.2
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	33.9	53.9
Financing Receivable, Originated Two Years before Latest Fiscal Year	73.4	119.7
Financing Receivable, Originated Three Years before Latest Fiscal Year	181.6	78.8
Financing Receivable, Originated Four Years before Latest Fiscal Year	17.4	5.7
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	5.9	3.3
Financing Receivable, Revolving	27.0	23.5
Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	343.8	289.0
Financing Receivable, Originated in Current Fiscal Year	16.5	45.4
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	41.9	23.1
Financing Receivable, Originated Two Years before Latest Fiscal Year	55.5	121.8
Financing Receivable, Originated Three Years before Latest Fiscal Year	119.9	27.8
Financing Receivable, Originated Four Years before Latest Fiscal Year	57.4	20.1
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	41.9	28.9
Financing Receivable, Revolving	10.7	21.9
Tech & Innovation [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,538.5	1,417.8
Financing Receivable, Originated in Current Fiscal Year	129.9	791.6
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	763.3	167.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	138.0	108.6
Financing Receivable, Originated Three Years before Latest Fiscal Year	99.6	6.1
Financing Receivable, Originated Four Years before Latest Fiscal Year	5.6	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.6	0.6
Financing Receivable, Revolving	401.5	343.9
Financing Receivable, 90 Days or More Past Due, Still Accruing	0.0	0.0
Tech & Innovation [Member] | Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,476.6	1,361.9
Financing Receivable, Originated in Current Fiscal Year	122.9	762.6
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	752.4	157.1
Financing Receivable, Originated Two Years before Latest Fiscal Year	118.8	101.1
Financing Receivable, Originated Three Years before Latest Fiscal Year	92.7	6.1
Financing Receivable, Originated Four Years before Latest Fiscal Year	5.6	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.6	0.6
Financing Receivable, Revolving	383.6	334.4
Tech & Innovation [Member] | Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	34.8	38.8
Financing Receivable, Originated in Current Fiscal Year	7.0	26.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	8.4	4.7
Financing Receivable, Originated Two Years before Latest Fiscal Year	3.5	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	1.5	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	14.4	8.1
Tech & Innovation [Member] | Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	27.1	17.1
Financing Receivable, Originated in Current Fiscal Year	0.0	3.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2.5	5.2
Financing Receivable, Originated Two Years before Latest Fiscal Year	15.7	7.5
Financing Receivable, Originated Three Years before Latest Fiscal Year	5.4	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	3.5	1.4
Other commercial and industrial [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	6,752.5	6,465.7
Financing Receivable, Originated in Current Fiscal Year	829.7	2,916.2
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,407.5	396.8
Financing Receivable, Originated Two Years before Latest Fiscal Year	338.7	414.7
Financing Receivable, Originated Three Years before Latest Fiscal Year	361.8	230.1
Financing Receivable, Originated Four Years before Latest Fiscal Year	217.5	81.7
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	171.6	98.0
Financing Receivable, Revolving	2,425.7	2,328.2
Financing Receivable, 90 Days or More Past Due, Still Accruing	0.0	0.0
Other commercial and industrial [Member] | Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	6,644.9	6,352.2
Financing Receivable, Originated in Current Fiscal Year	826.1	2,910.8
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,400.9	360.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	306.4	387.1
Financing Receivable, Originated Three Years before Latest Fiscal Year	334.6	210.3
Financing Receivable, Originated Four Years before Latest Fiscal Year	198.5	80.2
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	170.2	97.8
Financing Receivable, Revolving	2,408.2	2,306.0
Other commercial and industrial [Member] | Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	78.4	86.8
Financing Receivable, Originated in Current Fiscal Year	3.3	5.4
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	5.8	26.7
Financing Receivable, Originated Two Years before Latest Fiscal Year	19.1	22.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	20.2	17.6
Financing Receivable, Originated Four Years before Latest Fiscal Year	17.4	0.1
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	12.6	15.0
Other commercial and industrial [Member] | Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	29.2	26.7
Financing Receivable, Originated in Current Fiscal Year	0.3	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.8	10.1
Financing Receivable, Originated Two Years before Latest Fiscal Year	13.2	5.6
Financing Receivable, Originated Three Years before Latest Fiscal Year	7.0	2.2
Financing Receivable, Originated Four Years before Latest Fiscal Year	1.6	1.4
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1.4	0.2
Financing Receivable, Revolving	4.9	7.2
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,635.7	1,723.7
Financing Receivable, Originated in Current Fiscal Year	64.4	419.4
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	379.6	201.1
Financing Receivable, Originated Two Years before Latest Fiscal Year	198.4	221.4
Financing Receivable, Originated Three Years before Latest Fiscal Year	190.3	205.1
Financing Receivable, Originated Four Years before Latest Fiscal Year	196.0	286.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	551.3	334.6
Financing Receivable, Revolving	55.7	56.1
Financing Receivable, 90 Days or More Past Due, Still Accruing	0.0	0.0
Commercial Real Estate Owner Occupied [Member] | Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,605.7	1,682.2
Financing Receivable, Originated in Current Fiscal Year	56.4	417.2
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	377.4	198.5
Financing Receivable, Originated Two Years before Latest Fiscal Year	195.8	220.1
Financing Receivable, Originated Three Years before Latest Fiscal Year	190.1	190.4
Financing Receivable, Originated Four Years before Latest Fiscal Year	190.5	278.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	539.8	322.4
Financing Receivable, Revolving	55.7	55.6
Commercial Real Estate Owner Occupied [Member] | Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0.6	12.3
Financing Receivable, Originated in Current Fiscal Year	0.4	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.3
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.2	10.1
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	1.5
Financing Receivable, Revolving	0.0	0.4
Commercial Real Estate Owner Occupied [Member] | Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	29.4	29.2
Financing Receivable, Originated in Current Fiscal Year	7.6	2.2
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2.2	2.6
Financing Receivable, Originated Two Years before Latest Fiscal Year	2.6	1.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	4.6
Financing Receivable, Originated Four Years before Latest Fiscal Year	5.5	8.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	11.5	10.7
Financing Receivable, Revolving	0.0	0.1
Hotel franchise finance [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	2,694.7	2,534.0
Financing Receivable, Originated in Current Fiscal Year	246.9	751.6
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	717.3	205.3
Financing Receivable, Originated Two Years before Latest Fiscal Year	186.5	845.6
Financing Receivable, Originated Three Years before Latest Fiscal Year	815.8	399.2
Financing Receivable, Originated Four Years before Latest Fiscal Year	397.4	145.8
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	207.8	63.5
Financing Receivable, Revolving	123.0	123.0
Financing Receivable, 90 Days or More Past Due, Still Accruing	0.0
Hotel franchise finance [Member] | Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	2,337.4	2,239.6
Financing Receivable, Originated in Current Fiscal Year	238.3	721.3
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	697.0	205.3
Financing Receivable, Originated Two Years before Latest Fiscal Year	144.7	658.8
Financing Receivable, Originated Three Years before Latest Fiscal Year	584.8	332.2
Financing Receivable, Originated Four Years before Latest Fiscal Year	352.0	135.5
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	197.6	63.5
Financing Receivable, Revolving	123.0	123.0
Hotel franchise finance [Member] | Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	173.9	138.7
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	41.8	87.6
Financing Receivable, Originated Three Years before Latest Fiscal Year	132.1	51.1
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	0.0	0.0
Hotel franchise finance [Member] | Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	183.4	155.7
Financing Receivable, Originated in Current Fiscal Year	8.6	30.3
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	20.3	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	99.2
Financing Receivable, Originated Three Years before Latest Fiscal Year	98.9	15.9
Financing Receivable, Originated Four Years before Latest Fiscal Year	45.4	10.3
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	10.2	0.0
Financing Receivable, Revolving	0.0	0.0
Other Commercial Real Estate Non owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	4,115.1	3,951.8
Financing Receivable, Originated in Current Fiscal Year	445.2	1,413.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,344.5	754.8
Financing Receivable, Originated Two Years before Latest Fiscal Year	731.3	687.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	617.7	283.3
Financing Receivable, Originated Four Years before Latest Fiscal Year	219.4	186.1
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	443.2	301.6
Financing Receivable, Revolving	313.8	326.0
Financing Receivable, 90 Days or More Past Due, Still Accruing	0.0	0.0
Other Commercial Real Estate Non owner Occupied [Member] | Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	4,033.0	3,889.2
Financing Receivable, Originated in Current Fiscal Year	445.2	1,398.2
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,324.8	754.8
Financing Receivable, Originated Two Years before Latest Fiscal Year	720.5	673.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	592.0	278.8
Financing Receivable, Originated Four Years before Latest Fiscal Year	215.1	185.8
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	421.6	283.5
Financing Receivable, Revolving	313.8	315.1
Other Commercial Real Estate Non owner Occupied [Member] | Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	47.0	26.3
Financing Receivable, Originated in Current Fiscal Year	0.0	14.8
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	19.7	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	9.8
Financing Receivable, Originated Three Years before Latest Fiscal Year	21.6	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	5.7	1.7
Financing Receivable, Revolving	0.0	0.0
Other Commercial Real Estate Non owner Occupied [Member] | Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	35.1	36.3
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	10.8	4.2
Financing Receivable, Originated Three Years before Latest Fiscal Year	4.1	4.5
Financing Receivable, Originated Four Years before Latest Fiscal Year	4.3	0.3
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	15.9	16.4
Financing Receivable, Revolving	0.0	10.9
Residential Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	11,234.9	9,242.8
Financing Receivable, Originated in Current Fiscal Year	1,127.6	7,468.2
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	8,484.2	1,019.3
Financing Receivable, Originated Two Years before Latest Fiscal Year	958.0	399.1
Financing Receivable, Originated Three Years before Latest Fiscal Year	355.6	201.8
Financing Receivable, Originated Four Years before Latest Fiscal Year	171.9	41.7
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	103.7	76.6
Financing Receivable, Revolving	33.9	36.1
Financing Receivable, 90 Days or More Past Due, Still Accruing	0.0	0.0
Residential Real Estate [Member] | Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	11,212.3	9,227.7
Financing Receivable, Originated in Current Fiscal Year	1,127.6	7,459.3
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	8,469.1	1,018.4
Financing Receivable, Originated Two Years before Latest Fiscal Year	957.4	395.5
Financing Receivable, Originated Three Years before Latest Fiscal Year	351.8	201.3
Financing Receivable, Originated Four Years before Latest Fiscal Year	171.4	41.6
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	101.1	75.5
Financing Receivable, Revolving	33.9	36.1
Residential Real Estate [Member] | Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0.0	0.0
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	0.0	0.0
Residential Real Estate [Member] | Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	22.6	15.1
Financing Receivable, Originated in Current Fiscal Year	0.0	8.9
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	15.1	0.9
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.6	3.6
Financing Receivable, Originated Three Years before Latest Fiscal Year	3.8	0.5
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.5	0.1
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2.6	1.1
Financing Receivable, Revolving	0.0	0.0
Construction And Land Development [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	3,264.4	3,005.8
Financing Receivable, 90 Days or More Past Due, Still Accruing	0.0	0.0
Warehouse lending [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	4,530.2	5,155.9
Financing Receivable, Originated in Current Fiscal Year	0.0	242.6
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	223.6	12.5
Financing Receivable, Originated Two Years before Latest Fiscal Year	31.4	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	4,275.2	4,900.8
Warehouse lending [Member] | Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	4,530.2	5,155.9
Financing Receivable, Originated in Current Fiscal Year	0.0	242.6
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	223.6	12.5
Financing Receivable, Originated Two Years before Latest Fiscal Year	31.4	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	4,275.2	4,900.8
Warehouse lending [Member] | Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0.0	0.0
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	0.0	0.0
Warehouse lending [Member] | Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0.0	0.0
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	0.0	0.0
Municipal and nonprofit [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,497.0	1,579.2
Financing Receivable, Originated in Current Fiscal Year	5.0	129.5
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	141.0	195.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	194.1	101.2
Financing Receivable, Originated Three Years before Latest Fiscal Year	80.4	52.9
Financing Receivable, Originated Four Years before Latest Fiscal Year	50.1	219.3
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,022.8	877.8
Financing Receivable, Revolving	3.6	3.5
Municipal and nonprofit [Member] | Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,491.0	1,579.2
Financing Receivable, Originated in Current Fiscal Year	5.0	129.5
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	141.0	195.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	194.1	101.2
Financing Receivable, Originated Three Years before Latest Fiscal Year	74.4	52.9
Financing Receivable, Originated Four Years before Latest Fiscal Year	50.1	219.3
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,022.8	877.8
Financing Receivable, Revolving	3.6	3.5
Municipal and nonprofit [Member] | Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	6.0	0.0
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	6.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	0.0	0.0
Municipal and nonprofit [Member] | Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0.0	0.0
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	0.0	0.0
Other, loan segment
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	167.6	168.9
Financing Receivable, Originated in Current Fiscal Year	1.9	15.7
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	15.5	11.6
Financing Receivable, Originated Two Years before Latest Fiscal Year	8.3	3.8
Financing Receivable, Originated Three Years before Latest Fiscal Year	3.7	4.4
Financing Receivable, Originated Four Years before Latest Fiscal Year	4.2	4.4
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	84.1	82.6
Financing Receivable, Revolving	49.9	46.4
Financing Receivable, 90 Days or More Past Due, Still Accruing	0.0	0.0
Other, loan segment | Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	166.9	168.1
Financing Receivable, Originated in Current Fiscal Year	1.9	15.7
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	15.5	11.6
Financing Receivable, Originated Two Years before Latest Fiscal Year	8.3	3.7
Financing Receivable, Originated Three Years before Latest Fiscal Year	3.6	4.3
Financing Receivable, Originated Four Years before Latest Fiscal Year	4.1	4.4
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	83.6	82.0
Financing Receivable, Revolving	49.9	46.4
Other, loan segment | Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0.2	0.1
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.2	0.1
Financing Receivable, Revolving	0.0	0.0
Other, loan segment | Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0.5	0.7
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.1
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.1	0.1
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.1	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.3	0.5
Financing Receivable, Revolving	0.0	0.0
Construction And Land Development Land [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	3,264.4	3,005.8
Financing Receivable, Originated in Current Fiscal Year	297.7	958.6
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,066.0	659.1
Financing Receivable, Originated Two Years before Latest Fiscal Year	644.5	394.6
Financing Receivable, Originated Three Years before Latest Fiscal Year	245.7	112.2
Financing Receivable, Originated Four Years before Latest Fiscal Year	73.5	9.1
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	3.2	0.1
Financing Receivable, Revolving	933.8	872.1
Construction And Land Development Land [Member] | Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	3,238.9	2,969.5
Financing Receivable, Originated in Current Fiscal Year	297.7	957.6
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,065.0	632.3
Financing Receivable, Originated Two Years before Latest Fiscal Year	622.9	394.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	245.1	112.2
Financing Receivable, Originated Four Years before Latest Fiscal Year	73.5	3.5
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	3.2	0.1
Financing Receivable, Revolving	931.5	869.8
Construction And Land Development Land [Member] | Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	9.0	28.1
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	22.5
Financing Receivable, Originated Two Years before Latest Fiscal Year	9.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	5.6
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	0.0	0.0
Construction And Land Development Land [Member] | Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	16.5	8.2
Financing Receivable, Originated in Current Fiscal Year	0.0	1.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1.0	4.3
Financing Receivable, Originated Two Years before Latest Fiscal Year	12.6	0.6
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.6	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	2.3	2.3
Equity fund resources
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	3,688.5	3,829.8
Financing Receivable, Originated in Current Fiscal Year	0.0	9.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	13.6	1.7
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.3
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.3	2.2
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1.9	0.2
Financing Receivable, Revolving	3,672.7	3,816.4
Financing Receivable, 90 Days or More Past Due, Still Accruing		0.0
Equity fund resources | Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	3,688.5	3,829.8
Financing Receivable, Originated in Current Fiscal Year	0.0	9.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	13.6	1.7
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.3
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.3	2.2
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1.9	0.2
Financing Receivable, Revolving	3,672.7	3,816.4
Equity fund resources | Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0.0	0.0
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	0.0	0.0
Equity fund resources | Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0.0	0.0
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	0.0	0.0
Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	48.8	50.8
Financial Asset, 30 to 59 Days Past Due [Member] | Tech & Innovation [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0.0	0.0
Financial Asset, 30 to 59 Days Past Due [Member] | Other commercial and industrial [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	9.8	0.0
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0.0	0.0
Financial Asset, 30 to 59 Days Past Due [Member] | Hotel franchise finance [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0.0	0.0
Financial Asset, 30 to 59 Days Past Due [Member] | Other Commercial Real Estate Non owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	5.2	0.0
Financial Asset, 30 to 59 Days Past Due [Member] | Residential Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	31.6	50.7
Financial Asset, 30 to 59 Days Past Due [Member] | Construction And Land Development [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	2.0	0.0
Financial Asset, 30 to 59 Days Past Due [Member] | Warehouse lending [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0.0	0.0
Financial Asset, 30 to 59 Days Past Due [Member] | Municipal and nonprofit [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0.0	0.0
Financial Asset, 30 to 59 Days Past Due [Member] | Other, loan segment
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0.2	0.1
Financial Asset, 30 to 59 Days Past Due [Member] | Equity fund resources
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0.0	0.0
Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	8.8	1.7
Financial Asset, 60 to 89 Days Past Due [Member] | Tech & Innovation [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0.0	0.0
Financial Asset, 60 to 89 Days Past Due [Member] | Other commercial and industrial [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0.2	0.0
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0.0	0.0
Financial Asset, 60 to 89 Days Past Due [Member] | Hotel franchise finance [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0.0	0.0
Financial Asset, 60 to 89 Days Past Due [Member] | Other Commercial Real Estate Non owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0.0	0.0
Financial Asset, 60 to 89 Days Past Due [Member] | Residential Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	8.6	1.7
Financial Asset, 60 to 89 Days Past Due [Member] | Construction And Land Development [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0.0	0.0
Financial Asset, 60 to 89 Days Past Due [Member] | Warehouse lending [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0.0	0.0
Financial Asset, 60 to 89 Days Past Due [Member] | Municipal and nonprofit [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0.0	0.0
Financial Asset, 60 to 89 Days Past Due [Member] | Other, loan segment
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0.0	0.0
Financial Asset, 60 to 89 Days Past Due [Member] | Equity fund resources
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0.0	0.0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0.0	0.0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Tech & Innovation [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0.0	0.0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Other commercial and industrial [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0.0	0.0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0.0	0.0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Hotel franchise finance [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0.0	0.0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Other Commercial Real Estate Non owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0.0	0.0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0.0	0.0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction And Land Development [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0.0	0.0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Warehouse lending [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0.0	0.0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Municipal and nonprofit [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0.0	0.0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Other, loan segment
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0.0	0.0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Equity fund resources
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0.0	0.0
Financial Asset, Not Past Due
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	41,061.5	39,022.9
Financial Asset, Not Past Due | Tech & Innovation [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,538.5	1,417.8
Financial Asset, Not Past Due | Other commercial and industrial [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	6,742.5	6,465.7
Financial Asset, Not Past Due | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,635.7	1,723.7
Financial Asset, Not Past Due | Hotel franchise finance [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,694.7	2,534.0
Financial Asset, Not Past Due | Other Commercial Real Estate Non owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	4,109.9	3,951.8
Financial Asset, Not Past Due | Residential Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	11,194.7	9,190.4
Financial Asset, Not Past Due | Construction And Land Development [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	3,262.4	3,005.8
Financial Asset, Not Past Due | Warehouse lending [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	4,530.2	5,155.9
Financial Asset, Not Past Due | Municipal and nonprofit [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,497.0	1,579.2
Financial Asset, Not Past Due | Other, loan segment
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	167.4	168.8
Financial Asset, Not Past Due | Equity fund resources
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	3,688.5	3,829.8
Financial Asset, Past Due
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	57.6	52.5
Financial Asset, Past Due | Tech & Innovation [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0.0	0.0
Financial Asset, Past Due | Other commercial and industrial [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	10.0	0.0
Financial Asset, Past Due | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0.0	0.0
Financial Asset, Past Due | Hotel franchise finance [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0.0	0.0
Financial Asset, Past Due | Other Commercial Real Estate Non owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	5.2	0.0
Financial Asset, Past Due | Residential Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	40.2	52.4
Financial Asset, Past Due | Construction And Land Development [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	2.0	0.0
Financial Asset, Past Due | Warehouse lending [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0.0	0.0
Financial Asset, Past Due | Municipal and nonprofit [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0.0	0.0
Financial Asset, Past Due | Other, loan segment
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0.2	0.1
Financial Asset, Past Due | Equity fund resources
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 0.0	$ 0.0

XML

Loans, Leases and Allowance for Credit Losses - Loans by Risk Rating (Detail) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	$ 3,148.3	$ 15,115.4
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	15,556.1	3,624.2
Financing Receivable, Originated Two Years before Latest Fiscal Year	3,429.2	3,176.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,770.6	1,495.4
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,335.9	976.3
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,590.2	1,835.6
Financing Receivable, Revolving	12,288.8	12,852.5
Loans and Leases Receivable, Net of Deferred Income	41,119.1	39,075.4
Loans and Leases Receivable, Collateral for Secured Borrowings	266.5	226.8
Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	3,121.1	15,023.8
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	15,480.3	3,547.2
Financing Receivable, Originated Two Years before Latest Fiscal Year	3,300.3	2,934.5
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,469.1	1,388.8
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,261.1	950.5
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,542.4	1,803.4
Financing Receivable, Revolving	12,251.1	12,807.1
Loans and Leases Receivable, Net of Deferred Income	40,425.4	38,455.3
Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	10.7	46.2
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	33.9	53.9
Financing Receivable, Originated Two Years before Latest Fiscal Year	73.4	119.7
Financing Receivable, Originated Three Years before Latest Fiscal Year	181.6	78.8
Financing Receivable, Originated Four Years before Latest Fiscal Year	17.4	5.7
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	5.9	3.3
Financing Receivable, Revolving	27.0	23.5
Loans and Leases Receivable, Net of Deferred Income	349.9	331.1
Substandard [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	16.5	45.4
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	41.9	23.1
Financing Receivable, Originated Two Years before Latest Fiscal Year	55.5	121.8
Financing Receivable, Originated Three Years before Latest Fiscal Year	119.9	27.8
Financing Receivable, Originated Four Years before Latest Fiscal Year	57.4	20.1
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	41.9	28.9
Financing Receivable, Revolving	10.7	21.9
Loans and Leases Receivable, Net of Deferred Income	343.8	289.0
Tech & Innovation [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	129.9	791.6
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	763.3	167.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	138.0	108.6
Financing Receivable, Originated Three Years before Latest Fiscal Year	99.6	6.1
Financing Receivable, Originated Four Years before Latest Fiscal Year	5.6	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.6	0.6
Financing Receivable, Revolving	401.5	343.9
Loans and Leases Receivable, Net of Deferred Income	1,538.5	1,417.8
Tech & Innovation [Member] | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	122.9	762.6
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	752.4	157.1
Financing Receivable, Originated Two Years before Latest Fiscal Year	118.8	101.1
Financing Receivable, Originated Three Years before Latest Fiscal Year	92.7	6.1
Financing Receivable, Originated Four Years before Latest Fiscal Year	5.6	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.6	0.6
Financing Receivable, Revolving	383.6	334.4
Loans and Leases Receivable, Net of Deferred Income	1,476.6	1,361.9
Tech & Innovation [Member] | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	7.0	26.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	8.4	4.7
Financing Receivable, Originated Two Years before Latest Fiscal Year	3.5	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	1.5	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	14.4	8.1
Loans and Leases Receivable, Net of Deferred Income	34.8	38.8
Tech & Innovation [Member] | Substandard [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.0	3.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2.5	5.2
Financing Receivable, Originated Two Years before Latest Fiscal Year	15.7	7.5
Financing Receivable, Originated Three Years before Latest Fiscal Year	5.4	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	3.5	1.4
Loans and Leases Receivable, Net of Deferred Income	27.1	17.1
Other commercial and industrial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	829.7	2,916.2
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,407.5	396.8
Financing Receivable, Originated Two Years before Latest Fiscal Year	338.7	414.7
Financing Receivable, Originated Three Years before Latest Fiscal Year	361.8	230.1
Financing Receivable, Originated Four Years before Latest Fiscal Year	217.5	81.7
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	171.6	98.0
Financing Receivable, Revolving	2,425.7	2,328.2
Loans and Leases Receivable, Net of Deferred Income	6,752.5	6,465.7
Loans and Leases Receivable, Collateral for Secured Borrowings	16.4	12.5
Other commercial and industrial [Member] | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	826.1	2,910.8
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,400.9	360.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	306.4	387.1
Financing Receivable, Originated Three Years before Latest Fiscal Year	334.6	210.3
Financing Receivable, Originated Four Years before Latest Fiscal Year	198.5	80.2
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	170.2	97.8
Financing Receivable, Revolving	2,408.2	2,306.0
Loans and Leases Receivable, Net of Deferred Income	6,644.9	6,352.2
Other commercial and industrial [Member] | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	3.3	5.4
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	5.8	26.7
Financing Receivable, Originated Two Years before Latest Fiscal Year	19.1	22.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	20.2	17.6
Financing Receivable, Originated Four Years before Latest Fiscal Year	17.4	0.1
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	12.6	15.0
Loans and Leases Receivable, Net of Deferred Income	78.4	86.8
Other commercial and industrial [Member] | Substandard [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.3	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.8	10.1
Financing Receivable, Originated Two Years before Latest Fiscal Year	13.2	5.6
Financing Receivable, Originated Three Years before Latest Fiscal Year	7.0	2.2
Financing Receivable, Originated Four Years before Latest Fiscal Year	1.6	1.4
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1.4	0.2
Financing Receivable, Revolving	4.9	7.2
Loans and Leases Receivable, Net of Deferred Income	29.2	26.7
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	64.4	419.4
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	379.6	201.1
Financing Receivable, Originated Two Years before Latest Fiscal Year	198.4	221.4
Financing Receivable, Originated Three Years before Latest Fiscal Year	190.3	205.1
Financing Receivable, Originated Four Years before Latest Fiscal Year	196.0	286.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	551.3	334.6
Financing Receivable, Revolving	55.7	56.1
Loans and Leases Receivable, Net of Deferred Income	1,635.7	1,723.7
Loans and Leases Receivable, Collateral for Secured Borrowings	23.3	23.0
Commercial Real Estate Owner Occupied [Member] | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	56.4	417.2
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	377.4	198.5
Financing Receivable, Originated Two Years before Latest Fiscal Year	195.8	220.1
Financing Receivable, Originated Three Years before Latest Fiscal Year	190.1	190.4
Financing Receivable, Originated Four Years before Latest Fiscal Year	190.5	278.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	539.8	322.4
Financing Receivable, Revolving	55.7	55.6
Loans and Leases Receivable, Net of Deferred Income	1,605.7	1,682.2
Commercial Real Estate Owner Occupied [Member] | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.4	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.3
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.2	10.1
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	1.5
Financing Receivable, Revolving	0.0	0.4
Loans and Leases Receivable, Net of Deferred Income	0.6	12.3
Commercial Real Estate Owner Occupied [Member] | Substandard [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	7.6	2.2
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2.2	2.6
Financing Receivable, Originated Two Years before Latest Fiscal Year	2.6	1.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	4.6
Financing Receivable, Originated Four Years before Latest Fiscal Year	5.5	8.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	11.5	10.7
Financing Receivable, Revolving	0.0	0.1
Loans and Leases Receivable, Net of Deferred Income	29.4	29.2
Hotel franchise finance [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	246.9	751.6
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	717.3	205.3
Financing Receivable, Originated Two Years before Latest Fiscal Year	186.5	845.6
Financing Receivable, Originated Three Years before Latest Fiscal Year	815.8	399.2
Financing Receivable, Originated Four Years before Latest Fiscal Year	397.4	145.8
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	207.8	63.5
Financing Receivable, Revolving	123.0	123.0
Loans and Leases Receivable, Net of Deferred Income	2,694.7	2,534.0
Loans and Leases Receivable, Collateral for Secured Borrowings	183.4	155.7
Hotel franchise finance [Member] | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	238.3	721.3
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	697.0	205.3
Financing Receivable, Originated Two Years before Latest Fiscal Year	144.7	658.8
Financing Receivable, Originated Three Years before Latest Fiscal Year	584.8	332.2
Financing Receivable, Originated Four Years before Latest Fiscal Year	352.0	135.5
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	197.6	63.5
Financing Receivable, Revolving	123.0	123.0
Loans and Leases Receivable, Net of Deferred Income	2,337.4	2,239.6
Hotel franchise finance [Member] | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	41.8	87.6
Financing Receivable, Originated Three Years before Latest Fiscal Year	132.1	51.1
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	173.9	138.7
Hotel franchise finance [Member] | Substandard [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	8.6	30.3
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	20.3	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	99.2
Financing Receivable, Originated Three Years before Latest Fiscal Year	98.9	15.9
Financing Receivable, Originated Four Years before Latest Fiscal Year	45.4	10.3
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	10.2	0.0
Financing Receivable, Revolving	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	183.4	155.7
Other Commercial Real Estate Non owner Occupied [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	445.2	1,413.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,344.5	754.8
Financing Receivable, Originated Two Years before Latest Fiscal Year	731.3	687.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	617.7	283.3
Financing Receivable, Originated Four Years before Latest Fiscal Year	219.4	186.1
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	443.2	301.6
Financing Receivable, Revolving	313.8	326.0
Loans and Leases Receivable, Net of Deferred Income	4,115.1	3,951.8
Loans and Leases Receivable, Collateral for Secured Borrowings	31.0	31.6
Other Commercial Real Estate Non owner Occupied [Member] | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	445.2	1,398.2
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,324.8	754.8
Financing Receivable, Originated Two Years before Latest Fiscal Year	720.5	673.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	592.0	278.8
Financing Receivable, Originated Four Years before Latest Fiscal Year	215.1	185.8
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	421.6	283.5
Financing Receivable, Revolving	313.8	315.1
Loans and Leases Receivable, Net of Deferred Income	4,033.0	3,889.2
Other Commercial Real Estate Non owner Occupied [Member] | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.0	14.8
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	19.7	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	9.8
Financing Receivable, Originated Three Years before Latest Fiscal Year	21.6	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	5.7	1.7
Financing Receivable, Revolving	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	47.0	26.3
Other Commercial Real Estate Non owner Occupied [Member] | Substandard [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	10.8	4.2
Financing Receivable, Originated Three Years before Latest Fiscal Year	4.1	4.5
Financing Receivable, Originated Four Years before Latest Fiscal Year	4.3	0.3
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	15.9	16.4
Financing Receivable, Revolving	0.0	10.9
Loans and Leases Receivable, Net of Deferred Income	35.1	36.3
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	1,127.6	7,468.2
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	8,484.2	1,019.3
Financing Receivable, Originated Two Years before Latest Fiscal Year	958.0	399.1
Financing Receivable, Originated Three Years before Latest Fiscal Year	355.6	201.8
Financing Receivable, Originated Four Years before Latest Fiscal Year	171.9	41.7
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	103.7	76.6
Financing Receivable, Revolving	33.9	36.1
Loans and Leases Receivable, Net of Deferred Income	11,234.9	9,242.8
Residential Real Estate [Member] | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	1,127.6	7,459.3
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	8,469.1	1,018.4
Financing Receivable, Originated Two Years before Latest Fiscal Year	957.4	395.5
Financing Receivable, Originated Three Years before Latest Fiscal Year	351.8	201.3
Financing Receivable, Originated Four Years before Latest Fiscal Year	171.4	41.6
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	101.1	75.5
Financing Receivable, Revolving	33.9	36.1
Loans and Leases Receivable, Net of Deferred Income	11,212.3	9,227.7
Residential Real Estate [Member] | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	0.0	0.0
Residential Real Estate [Member] | Substandard [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.0	8.9
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	15.1	0.9
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.6	3.6
Financing Receivable, Originated Three Years before Latest Fiscal Year	3.8	0.5
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.5	0.1
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2.6	1.1
Financing Receivable, Revolving	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	22.6	15.1
Construction And Land Development Land [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	297.7	958.6
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,066.0	659.1
Financing Receivable, Originated Two Years before Latest Fiscal Year	644.5	394.6
Financing Receivable, Originated Three Years before Latest Fiscal Year	245.7	112.2
Financing Receivable, Originated Four Years before Latest Fiscal Year	73.5	9.1
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	3.2	0.1
Financing Receivable, Revolving	933.8	872.1
Loans and Leases Receivable, Net of Deferred Income	3,264.4	3,005.8
Construction And Land Development Land [Member] | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	297.7	957.6
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,065.0	632.3
Financing Receivable, Originated Two Years before Latest Fiscal Year	622.9	394.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	245.1	112.2
Financing Receivable, Originated Four Years before Latest Fiscal Year	73.5	3.5
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	3.2	0.1
Financing Receivable, Revolving	931.5	869.8
Loans and Leases Receivable, Net of Deferred Income	3,238.9	2,969.5
Construction And Land Development Land [Member] | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	22.5
Financing Receivable, Originated Two Years before Latest Fiscal Year	9.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	5.6
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	9.0	28.1
Construction And Land Development Land [Member] | Substandard [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.0	1.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1.0	4.3
Financing Receivable, Originated Two Years before Latest Fiscal Year	12.6	0.6
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.6	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	2.3	2.3
Loans and Leases Receivable, Net of Deferred Income	16.5	8.2
Warehouse lending [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.0	242.6
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	223.6	12.5
Financing Receivable, Originated Two Years before Latest Fiscal Year	31.4	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	4,275.2	4,900.8
Loans and Leases Receivable, Net of Deferred Income	4,530.2	5,155.9
Warehouse lending [Member] | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.0	242.6
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	223.6	12.5
Financing Receivable, Originated Two Years before Latest Fiscal Year	31.4	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	4,275.2	4,900.8
Loans and Leases Receivable, Net of Deferred Income	4,530.2	5,155.9
Warehouse lending [Member] | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	0.0	0.0
Warehouse lending [Member] | Substandard [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	0.0	0.0
Municipal and nonprofit [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	5.0	129.5
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	141.0	195.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	194.1	101.2
Financing Receivable, Originated Three Years before Latest Fiscal Year	80.4	52.9
Financing Receivable, Originated Four Years before Latest Fiscal Year	50.1	219.3
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,022.8	877.8
Financing Receivable, Revolving	3.6	3.5
Loans and Leases Receivable, Net of Deferred Income	1,497.0	1,579.2
Municipal and nonprofit [Member] | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	5.0	129.5
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	141.0	195.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	194.1	101.2
Financing Receivable, Originated Three Years before Latest Fiscal Year	74.4	52.9
Financing Receivable, Originated Four Years before Latest Fiscal Year	50.1	219.3
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,022.8	877.8
Financing Receivable, Revolving	3.6	3.5
Loans and Leases Receivable, Net of Deferred Income	1,491.0	1,579.2
Municipal and nonprofit [Member] | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	6.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	6.0	0.0
Municipal and nonprofit [Member] | Substandard [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	0.0	0.0
Other, loan segment
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	1.9	15.7
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	15.5	11.6
Financing Receivable, Originated Two Years before Latest Fiscal Year	8.3	3.8
Financing Receivable, Originated Three Years before Latest Fiscal Year	3.7	4.4
Financing Receivable, Originated Four Years before Latest Fiscal Year	4.2	4.4
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	84.1	82.6
Financing Receivable, Revolving	49.9	46.4
Loans and Leases Receivable, Net of Deferred Income	167.6	168.9
Loans and Leases Receivable, Collateral for Secured Borrowings	0.1	0.1
Other, loan segment | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	1.9	15.7
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	15.5	11.6
Financing Receivable, Originated Two Years before Latest Fiscal Year	8.3	3.7
Financing Receivable, Originated Three Years before Latest Fiscal Year	3.6	4.3
Financing Receivable, Originated Four Years before Latest Fiscal Year	4.1	4.4
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	83.6	82.0
Financing Receivable, Revolving	49.9	46.4
Loans and Leases Receivable, Net of Deferred Income	166.9	168.1
Other, loan segment | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.2	0.1
Financing Receivable, Revolving	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	0.2	0.1
Other, loan segment | Substandard [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.1
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.1	0.1
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.1	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.3	0.5
Financing Receivable, Revolving	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	0.5	0.7
Equity fund resources
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.0	9.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	13.6	1.7
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.3
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.3	2.2
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1.9	0.2
Financing Receivable, Revolving	3,672.7	3,816.4
Loans and Leases Receivable, Net of Deferred Income	3,688.5	3,829.8
Equity fund resources | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.0	9.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	13.6	1.7
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.3
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.3	2.2
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1.9	0.2
Financing Receivable, Revolving	3,672.7	3,816.4
Loans and Leases Receivable, Net of Deferred Income	3,688.5	3,829.8
Equity fund resources | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	0.0	0.0
Equity fund resources | Substandard [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	$ 0.0	$ 0.0

XML

Loans, Leases and Allowance for Credit Losses Loans, Leases and Allowance for Credit Losses - Troubled Debt Restructurings (Details) $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($) SecurityLoan	Mar. 31, 2021 USD ($) SecurityLoan	Dec. 31, 2021 USD ($) SecurityLoan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	$ 266.5		$ 226.8
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | SecurityLoan	0	0
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend	$ 4.0		0.0
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 4.1	$ 4.7
Financing Receivable, Modifications, Number of Contracts | SecurityLoan	1	3
Financing Receivable, Troubled Debt Restructuring	$ 22.2		20.8
Reserves allocated to customers whose loan terms modified in troubled debt restructurings	$ 1.0		$ 0.0
Financing Receivable, Troubled Debt Restructured Loans, Number of Outstanding Contracts | SecurityLoan	15		16
COVID-19-related Loan Modifications	$ 131.4
Loans in Forbearance	12.9
Tech & Innovation [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring	$ 4.1		$ 2.1
Financing Receivable, Troubled Debt Restructured Loans, Number of Outstanding Contracts | SecurityLoan	1		2
Other commercial and industrial [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	$ 16.4		$ 12.5
Financing Receivable, Troubled Debt Restructuring	$ 5.9		$ 6.2
Financing Receivable, Troubled Debt Restructured Loans, Number of Outstanding Contracts | SecurityLoan	7		7
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	$ 23.3		$ 23.0
Financing Receivable, Troubled Debt Restructuring	$ 0.5		$ 0.5
Financing Receivable, Troubled Debt Restructured Loans, Number of Outstanding Contracts | SecurityLoan	1		1
Hotel franchise finance [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	$ 183.4		$ 155.7
Other Commercial Real Estate Non owner Occupied [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	31.0		31.6
Financing Receivable, Troubled Debt Restructuring	$ 10.7		$ 11.0
Financing Receivable, Troubled Debt Restructured Loans, Number of Outstanding Contracts | SecurityLoan	5		5
Construction And Land Development [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	$ 12.3		$ 3.9
Financing Receivable, Troubled Debt Restructuring	$ 1.0		$ 1.0
Financing Receivable, Troubled Debt Restructured Loans, Number of Outstanding Contracts | SecurityLoan	1		1

XML

Loans, Leases and Allowance for Credit Losses Loans, Leases and Allowance for Credit Losses - Collateral Dependent Loans (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	$ 266.5	$ 226.8
Loans collectively evaluated for impairment	40,806.0	38,812.3
Financing Receivable, Individually Evaluated for Impairment	313.1	263.1
Loans and Leases Receivable, Net of Deferred Income	41,119.1	39,075.4
Loans collectively evaluated for impairment	244.0	236.4
Total loans individually evaluated for impairment	13.6	16.1
Financing Receivable, Allowance for Credit Loss	257.6	252.5	$ 247.1	$ 278.9
Real Estate Collateral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	250.0	214.2
Other Collateral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	16.5	12.6
Tech & Innovation [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans collectively evaluated for impairment	1,511.5	1,400.8
Financing Receivable, Individually Evaluated for Impairment	27.0	17.0
Loans and Leases Receivable, Net of Deferred Income	1,538.5	1,417.8
Loans collectively evaluated for impairment	23.7	22.9
Total loans individually evaluated for impairment	4.3	2.8
Financing Receivable, Allowance for Credit Loss	28.0	25.7	23.0	33.4
Other commercial and industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	16.4	12.5
Loans collectively evaluated for impairment	6,726.5	6,442.7
Financing Receivable, Individually Evaluated for Impairment	26.0	23.0
Loans and Leases Receivable, Net of Deferred Income	6,752.5	6,465.7
Loans collectively evaluated for impairment	112.9	101.1
Total loans individually evaluated for impairment	2.8	2.5
Financing Receivable, Allowance for Credit Loss	115.7	103.6	78.4	94.7
Other commercial and industrial [Member] | Real Estate Collateral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	0.0	0.0
Other commercial and industrial [Member] | Other Collateral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	16.4	12.5
Commercial Real Estate Owner Occupied [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	23.3	23.0
Loans collectively evaluated for impairment	1,609.7	1,699.3
Financing Receivable, Individually Evaluated for Impairment	26.0	24.4
Loans and Leases Receivable, Net of Deferred Income	1,635.7	1,723.7
Loans collectively evaluated for impairment	8.1	10.6
Total loans individually evaluated for impairment	0.0	0.0
Financing Receivable, Allowance for Credit Loss	8.1	10.6	9.7	18.6
Commercial Real Estate Owner Occupied [Member] | Real Estate Collateral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	23.3	23.0
Commercial Real Estate Owner Occupied [Member] | Other Collateral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	0.0	0.0
Hotel franchise finance [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	183.4	155.7
Loans collectively evaluated for impairment	2,511.3	2,378.3
Financing Receivable, Individually Evaluated for Impairment	183.4	155.7
Loans and Leases Receivable, Net of Deferred Income	2,694.7	2,534.0
Loans collectively evaluated for impairment	24.1	30.7
Total loans individually evaluated for impairment	6.5	10.8
Financing Receivable, Allowance for Credit Loss	30.6	41.5	49.4	43.3
Hotel franchise finance [Member] | Real Estate Collateral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	183.4	155.7
Hotel franchise finance [Member] | Other Collateral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	0.0	0.0
Other Commercial Real Estate Non owner Occupied [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	31.0	31.6
Loans collectively evaluated for impairment	4,081.2	3,917.3
Financing Receivable, Individually Evaluated for Impairment	33.9	34.5
Loans and Leases Receivable, Net of Deferred Income	4,115.1	3,951.8
Loans collectively evaluated for impairment	15.3	16.9
Total loans individually evaluated for impairment	0.0	0.0
Financing Receivable, Allowance for Credit Loss	15.3	16.9	32.7	39.9
Other Commercial Real Estate Non owner Occupied [Member] | Real Estate Collateral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	31.0	31.6
Other Commercial Real Estate Non owner Occupied [Member] | Other Collateral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	0.0	0.0
Residential Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans collectively evaluated for impairment	11,234.9	9,242.8
Financing Receivable, Individually Evaluated for Impairment	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	11,234.9	9,242.8
Loans collectively evaluated for impairment	23.8	12.5
Total loans individually evaluated for impairment	0.0	0.0
Financing Receivable, Allowance for Credit Loss	23.8	12.5	3.2	0.8
Construction And Land Development [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	12.3	3.9
Loans collectively evaluated for impairment	3,247.9	2,997.6
Financing Receivable, Individually Evaluated for Impairment	16.5	8.2
Loans and Leases Receivable, Net of Deferred Income	3,264.4	3,005.8
Loans collectively evaluated for impairment	10.7	12.5
Total loans individually evaluated for impairment	0.0	0.0
Financing Receivable, Allowance for Credit Loss	10.7	12.5	25.9	22.0
Construction And Land Development [Member] | Real Estate Collateral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	12.3	3.9
Construction And Land Development [Member] | Other Collateral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	0.0	0.0
Warehouse lending [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans collectively evaluated for impairment	4,530.2	5,155.9
Financing Receivable, Individually Evaluated for Impairment	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	4,530.2	5,155.9
Loans collectively evaluated for impairment	2.9	3.0
Total loans individually evaluated for impairment	0.0	0.0
Financing Receivable, Allowance for Credit Loss	2.9	3.0	3.6	3.4
Municipal and nonprofit [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans collectively evaluated for impairment	1,497.0	1,579.2
Financing Receivable, Individually Evaluated for Impairment	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	1,497.0	1,579.2
Loans collectively evaluated for impairment	13.4	13.7
Total loans individually evaluated for impairment	0.0	0.0
Financing Receivable, Allowance for Credit Loss	13.4	13.7	15.2	15.9
Other, loan segment
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	0.1	0.1
Loans collectively evaluated for impairment	167.3	168.6
Financing Receivable, Individually Evaluated for Impairment	0.3	0.3
Loans and Leases Receivable, Net of Deferred Income	167.6	168.9
Loans collectively evaluated for impairment	2.5	2.9
Total loans individually evaluated for impairment	0.0	0.0
Financing Receivable, Allowance for Credit Loss	2.5	2.9	5.1	5.0
Other, loan segment | Real Estate Collateral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	0.0	0.0
Other, loan segment | Other Collateral [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Collateral for Secured Borrowings	0.1	0.1
Equity fund resources
Loans and Leases Receivable Disclosure [Line Items]
Loans collectively evaluated for impairment	3,688.5	3,829.8
Financing Receivable, Individually Evaluated for Impairment	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	3,688.5	3,829.8
Loans collectively evaluated for impairment	6.6	9.6
Total loans individually evaluated for impairment	0.0	0.0
Financing Receivable, Allowance for Credit Loss	$ 6.6	$ 9.6	$ 0.9	$ 1.9

XML

Loans, Leases and Allowance for Credit Losses - Allowances for Credit Losses (Detail) Valuation - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Valuation Allowance [Line Items]
Financing Receivable, Allowance for Credit Loss	$ 257.6	$ 247.1	$ 252.5	$ 278.9
Provision for Loan and Lease Losses	(5.3)	(30.4)
Financing Receivable, Allowance for Credit Loss, Writeoff	2.6	2.1
Financing Receivable, Allowance for Credit Loss, Recovery	(2.4)	(0.7)
Financing Receivable, Collectively Evaluated for Impairment	40,806.0		38,812.3
Financing Receivable, Individually Evaluated for Impairment	313.1		263.1
Loans and Leases Receivable, Net of Deferred Income	41,119.1		39,075.4
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	244.0		236.4
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	13.6		16.1
Off-Balance Sheet, Credit Loss, Liability	43.3	32.6	37.6	37.0
Loans and Leases Receivable, Allowance	257.6		252.5
Interest Receivable	201.1		197.6
Off-Balance Sheet, Credit Loss, Liability, Change in Method, Credit Loss Expense (Reversal)	5.7	(4.4)
Tech & Innovation [Member]
Valuation Allowance [Line Items]
Financing Receivable, Allowance for Credit Loss	28.0	23.0	25.7	33.4
Provision for Loan and Lease Losses	(0.3)	(10.6)
Financing Receivable, Allowance for Credit Loss, Writeoff	0.0	0.0
Financing Receivable, Allowance for Credit Loss, Recovery	(2.0)	(0.2)
Financing Receivable, Collectively Evaluated for Impairment	1,511.5		1,400.8
Financing Receivable, Individually Evaluated for Impairment	27.0		17.0
Loans and Leases Receivable, Net of Deferred Income	1,538.5		1,417.8
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	23.7		22.9
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	4.3		2.8
Other commercial and industrial [Member]
Valuation Allowance [Line Items]
Financing Receivable, Allowance for Credit Loss	115.7	78.4	103.6	94.7
Provision for Loan and Lease Losses	(14.3)	(16.5)
Financing Receivable, Allowance for Credit Loss, Writeoff	2.6	0.1
Financing Receivable, Allowance for Credit Loss, Recovery	(0.4)	(0.3)
Financing Receivable, Collectively Evaluated for Impairment	6,726.5		6,442.7
Financing Receivable, Individually Evaluated for Impairment	26.0		23.0
Loans and Leases Receivable, Net of Deferred Income	6,752.5		6,465.7
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	112.9		101.1
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	2.8		2.5
Commercial Real Estate Owner Occupied [Member]
Valuation Allowance [Line Items]
Financing Receivable, Allowance for Credit Loss	8.1	9.7	10.6	18.6
Provision for Loan and Lease Losses	(2.5)	(8.9)
Financing Receivable, Allowance for Credit Loss, Writeoff	0.0	0.0
Financing Receivable, Allowance for Credit Loss, Recovery	0.0	0.0
Financing Receivable, Collectively Evaluated for Impairment	1,609.7		1,699.3
Financing Receivable, Individually Evaluated for Impairment	26.0		24.4
Loans and Leases Receivable, Net of Deferred Income	1,635.7		1,723.7
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	8.1		10.6
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0.0		0.0
Hotel franchise finance [Member]
Valuation Allowance [Line Items]
Financing Receivable, Allowance for Credit Loss	30.6	49.4	41.5	43.3
Provision for Loan and Lease Losses	(10.9)	(6.1)
Financing Receivable, Allowance for Credit Loss, Writeoff	0.0	0.0
Financing Receivable, Allowance for Credit Loss, Recovery	0.0	0.0
Financing Receivable, Collectively Evaluated for Impairment	2,511.3		2,378.3
Financing Receivable, Individually Evaluated for Impairment	183.4		155.7
Loans and Leases Receivable, Net of Deferred Income	2,694.7		2,534.0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	24.1		30.7
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	6.5		10.8
Other Commercial Real Estate Non owner Occupied [Member]
Valuation Allowance [Line Items]
Financing Receivable, Allowance for Credit Loss	15.3	32.7	16.9	39.9
Provision for Loan and Lease Losses	(1.6)	(5.4)
Financing Receivable, Allowance for Credit Loss, Writeoff	0.0	2.0
Financing Receivable, Allowance for Credit Loss, Recovery	0.0	(0.2)
Financing Receivable, Collectively Evaluated for Impairment	4,081.2		3,917.3
Financing Receivable, Individually Evaluated for Impairment	33.9		34.5
Loans and Leases Receivable, Net of Deferred Income	4,115.1		3,951.8
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	15.3		16.9
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0.0		0.0
Residential Real Estate [Member]
Valuation Allowance [Line Items]
Financing Receivable, Allowance for Credit Loss	23.8	3.2	12.5	0.8
Provision for Loan and Lease Losses	(11.3)	(2.4)
Financing Receivable, Allowance for Credit Loss, Writeoff	0.0	0.0
Financing Receivable, Allowance for Credit Loss, Recovery	0.0	0.0
Financing Receivable, Collectively Evaluated for Impairment	11,234.9		9,242.8
Financing Receivable, Individually Evaluated for Impairment	0.0		0.0
Loans and Leases Receivable, Net of Deferred Income	11,234.9		9,242.8
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	23.8		12.5
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0.0		0.0
Construction And Land Development [Member]
Valuation Allowance [Line Items]
Financing Receivable, Allowance for Credit Loss	10.7	25.9	12.5	22.0
Provision for Loan and Lease Losses	(1.8)	(3.9)
Financing Receivable, Allowance for Credit Loss, Writeoff	0.0	0.0
Financing Receivable, Allowance for Credit Loss, Recovery	0.0	0.0
Financing Receivable, Collectively Evaluated for Impairment	3,247.9		2,997.6
Financing Receivable, Individually Evaluated for Impairment	16.5		8.2
Loans and Leases Receivable, Net of Deferred Income	3,264.4		3,005.8
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	10.7		12.5
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0.0		0.0
Warehouse lending [Member]
Valuation Allowance [Line Items]
Financing Receivable, Allowance for Credit Loss	2.9	3.6	3.0	3.4
Provision for Loan and Lease Losses	(0.1)	(0.2)
Financing Receivable, Allowance for Credit Loss, Writeoff	0.0	0.0
Financing Receivable, Allowance for Credit Loss, Recovery	0.0	0.0
Financing Receivable, Collectively Evaluated for Impairment	4,530.2		5,155.9
Financing Receivable, Individually Evaluated for Impairment	0.0		0.0
Loans and Leases Receivable, Net of Deferred Income	4,530.2		5,155.9
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	2.9		3.0
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0.0		0.0
Municipal and nonprofit [Member]
Valuation Allowance [Line Items]
Financing Receivable, Allowance for Credit Loss	13.4	15.2	13.7	15.9
Provision for Loan and Lease Losses	(0.3)	(0.7)
Financing Receivable, Allowance for Credit Loss, Writeoff	0.0	0.0
Financing Receivable, Allowance for Credit Loss, Recovery	0.0	0.0
Financing Receivable, Collectively Evaluated for Impairment	1,497.0		1,579.2
Financing Receivable, Individually Evaluated for Impairment	0.0		0.0
Loans and Leases Receivable, Net of Deferred Income	1,497.0		1,579.2
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	13.4		13.7
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0.0		0.0
Other, loan segment
Valuation Allowance [Line Items]
Financing Receivable, Allowance for Credit Loss	2.5	5.1	2.9	5.0
Provision for Loan and Lease Losses	(0.4)	(0.1)
Financing Receivable, Allowance for Credit Loss, Writeoff	0.0	0.0
Financing Receivable, Allowance for Credit Loss, Recovery	0.0	0.0
Financing Receivable, Collectively Evaluated for Impairment	167.3		168.6
Financing Receivable, Individually Evaluated for Impairment	0.3		0.3
Loans and Leases Receivable, Net of Deferred Income	167.6		168.9
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	2.5		2.9
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0.0		0.0
Equity fund resources
Valuation Allowance [Line Items]
Financing Receivable, Allowance for Credit Loss	6.6	0.9	9.6	$ 1.9
Provision for Loan and Lease Losses	(3.0)	(1.0)
Financing Receivable, Allowance for Credit Loss, Writeoff	0.0	0.0
Financing Receivable, Allowance for Credit Loss, Recovery	0.0	$ 0.0
Financing Receivable, Collectively Evaluated for Impairment	3,688.5		3,829.8
Financing Receivable, Individually Evaluated for Impairment	0.0		0.0
Loans and Leases Receivable, Net of Deferred Income	3,688.5		3,829.8
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	6.6		9.6
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	$ 0.0		$ 0.0

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Loans, Leases and Allowance for Credit Losses Loans, Leases and Allowance for Credit Losses - Loan Purchases and Sales (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Financing Receivable, Purchase
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Purchase	$ 2,400.0	$ 1,000.0

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MSR Portfolio (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Apr. 07, 2021
Servicing Assets at Fair Value [Line Items]
Servicing Asset at Fair Value, Amount	$ 950.3		$ 698.0
Servicing Asset at Fair Value, Additions	204.1	$ 0.0
Servicing Asset at Fair Value, Disposals	0.0
Servicing Asset at Fair Value, Changes in Fair Value Resulting from Changes in Valuation Inputs or Changes in Assumptions	81.4
Servicing Asset at Fair Value, Other Changes in Fair Value	(33.2)
Continuing Involvement with Transferred Financial Assets, Principal Amount Outstanding	65,546.7
Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset	42.9
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Servicing Assets				$ 1,347.0
MSR Loan Sales, Receivable	58.4
Mortgage servicing asset
Servicing Assets at Fair Value [Line Items]
Servicing Asset at Fair Value, Other Changes in Fair Value	(56.2)
Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset	$ 61.0

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UPB in MSR Portfolio (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Servicing Assets at Fair Value [Line Items]
Continuing Involvement with Transferred Financial Assets, Principal Amount Outstanding	$ 65,546.7
Servicing advances, net	$ (62.8)	$ (81.6)

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Hypothetical Change in FV (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Servicing Assets at Fair Value [Line Items]
Servicing Asset at Fair Value, Amount	$ 950.3	$ 698.0
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 50 basis point Adverse Interest Rate Change	(30.1)
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 50 basis point Favorable Interest Rate Change	17.7
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 50 basis point Discount Rate Increase	(18.2)
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 50 basis point Discount Rate Decrease	18.9
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 1 Percent Adverse Change in Prepayment Speed	(24.3)
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 1 Percent Adverse Change in Prepayment Speed	26.9
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Increase Cost of Service	(11.9)
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Decrease Cost of Service	$ 11.9

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Net Loan Servicing Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Servicing Assets at Fair Value [Line Items]
Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset	$ 42.9
Servicing Asset at Fair Value, Other Changes in Fair Value	(33.2)
Unrealized Gain (Loss) on Derivatives	(81.2)
Expense Related to Distribution or Servicing and Underwriting Fees	10.8	$ 0.0
Servicing advances, net	62.8		$ 81.6
Mortgage servicing asset
Servicing Assets at Fair Value [Line Items]
Servicing Asset at Fair Value, Additions	1.8
Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset	61.0
Servicing Asset at Fair Value, Other Changes in Fair Value	(56.2)
Cash Flows Between Transferor and Transferee, Servicing Fees	67.6
Gain (Loss) on Disposition of Assets for Financial Service Operations	(0.2)
Unrealized Gain (Loss) on Derivatives	82.6
Derivative Instruments Not Designated as Hedging Instruments, Loss	46.4
Expense Related to Distribution or Servicing and Underwriting Fees	20.8
Contractually Specified Servicing Fees, Amount	$ 59.2

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Other Borrowings - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Debt [Line Items]
FHLB advances	$ 0.0
Other Short-term Borrowings	52.3	$ 35.3
Short-term Debt	70.3	726.9
Senior Notes	317.5	317.9
Notes Payable	445.5	457.1
Long-term Debt	763.0	775.0
Other borrowings	833.3	1,501.9
Customer repurchase agreements	18.0	16.6
Federal Funds Purchased	0.0	675.0
Notes Payable, Other Payables
Debt [Line Items]
Debt Issuance Cost	2.9
Debt Instrument, Face Amount	$ 242.0
Debt Instrument, Interest Rate Terms	LIBOR plus 5.50%
Senior Notes
Debt [Line Items]
Debt Instrument, Face Amount	$ 300.0
Debt Instrument, Interest Rate, Stated Percentage	6.50%
Credit Linked Notes Maturing July 2059
Debt [Line Items]
Debt Issuance Cost	$ 3.0
Debt Instrument, Face Amount	227.6
Federal Home Loan Bank Advances [Member]
Debt [Line Items]
Additional available credit with the entity	9,900.0	7,800.0
FRB [Member]
Debt [Line Items]
Additional available credit with the entity	4,100.0	$ 3,400.0
Unsecured Credit Facility [Member]
Debt [Line Items]
Secured borrowing credit line	3,500.0
Warehouse Agreement Borrowings
Debt [Line Items]
Additional available credit with the entity	$ 1,000.0

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Qualifying Debt (Details)	3 Months Ended
	Mar. 31, 2022 USD ($) Trust $ / shares	Mar. 31, 2021 $ / shares	Dec. 31, 2021 USD ($)	Jun. 16, 2016 USD ($)
Debt Instrument [Line Items]
Common Stock, Dividends, Per Share, Cash Paid | $ / shares	$ 0.35	$ 0.25
Number of Statutory Business Trusts Formed or Acquired | Trust	8
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	$ 77,800,000		$ 80,700,000
Subordinated Long-term Debt, Noncurrent	815,500,000		815,100,000
Subordinated Debt [Member] | Subordinated Debentures Maturing July 2056 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount				$ 175,000,000
Debt Instrument, Interest Rate, Stated Percentage				6.25%
Subordinated Debt [Member] | Subordinated Debentures Maturing June 2030 [Member] [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	225,000,000.0		225,000,000.0
Debt Issuance Cost	$ 3,100,000		$ 3,100,000
Debt Instrument, Interest Rate, Stated Percentage	5.25%		5.25%
Subordinated Debt [Member] | Subordinated Debentures Maturing June 2031
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 600,000,000.0		$ 600,000,000.0
Debt Issuance Cost	$ 8,100,000		$ 8,100,000
Debt Instrument, Interest Rate, Stated Percentage	3.00%		3.00%
Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate, at Point in Time	3.30%		2.55%

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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends, Common Stock, Cash	$ 37.3	$ 25.3
Common Stock, Dividends, Per Share, Cash Paid	$ 0.35	$ 0.25
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation	185,534	154,163
Treasury Stock Acquired, Average Cost Per Share	$ 93.51	$ 83.56
Stock Issued During Period, Shares, New Issues	1,300,000	2,300,000
Shares Issued, Price Per Share	$ 86.78	$ 91.00
Stock Issued During Period, Value, New Issues	$ 107.7	$ 209.2
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs	0.7
Proceeds from Issuance of Common Stock	$ 94.9	209.2
Preferred Stock, Dividends, Per Share, Cash Paid	$ 0.27
Preferred Stock, Shares Outstanding	12,000,000		12,000,000
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense	$ 2.8	2.1
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture	40.0	23.7
Share-based Payment Arrangement, Expense	7.1	5.6
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Value, New Issues	108.4
Executive Officer [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense		0.3
Retained Earnings [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends, Common Stock, Cash	$ 37.3	$ 25.3
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury Stock, Shares, Acquired	200,000	200,000
Stock Issued During Period, Shares, New Issues	1,300,000	2,300,000
Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred Stock, Shares Outstanding	12,000,000

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Accumulated Other Comprehensive Income - Summary of Changes in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 15.7	$ 92.3
Other comprehensive income before reclassifications	245.7	72.3
Amounts reclassified from accumulated other comprehensive income	(5.1)	(0.1)
Net other comprehensive loss	250.8	72.4
Ending balance	(235.1)	19.9
Unrealized holding gains (losses) on AFS
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	16.7	92.1
Other comprehensive income before reclassifications	247.9	72.0
Amounts reclassified from accumulated other comprehensive income	(5.1)	(0.1)
Net other comprehensive loss	253.0	72.1
Ending balance	(236.3)	20.0
Accumulated Gain (Loss), Financial Liability, Fair Value Option, Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(0.7)	0.5
Other comprehensive income before reclassifications	2.2	0.3
Amounts reclassified from accumulated other comprehensive income	0.0	0.0
Net other comprehensive loss	2.2	0.3
Ending balance	1.5	0.2
Supplemental Employee Retirement Plan [Member]
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	0.0	0.0
Ending balance	$ 0.3	$ (0.3)

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Accumulated Other Comprehensive Income - Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount reclassified from accumulated other comprehensive income	$ 1.8	$ (0.0)
Amount reclassified from accumulated other comprehensive income	$ 5.1	$ 0.1

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Derivatives and Hedging Fair Value of Derivative Contracts (Detail) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Jun. 16, 2016
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	$ 154.2	$ 38.4	$ 7.9
Derivative Liability, Fair Value	(158.2)	(96.3)	(57.7)
Derivative Asset, Not Subject to Master Netting Arrangement	7.5	11.8	1.2
Derivative Liability, Not Subject to Master Netting Arrangement	(19.6)	(3.5)	(0.9)
Derivative Asset, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election	31.7	21.8	9.1
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	161.7	50.2	9.1
Derivative Liability, Fair Value, Amount Offset Against Collateral	(28.2)	(67.9)	(57.7)
Derivative Netting Adjustments, Liabilities	130.0	28.4	0.0
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	(64.9)	(6.5)
Derivative Netting Adjustments, Assets	(130.0)	(28.4)	0.0
Derivative Liability, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election	47.8	71.4	58.6
Derivative Asset, Fair Value, Amount Offset Against Collateral	24.2	10.0	7.9
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	177.8	99.8	58.6
Derivative Asset, Collateral, Obligation to Return Cash, Offset	0.1	1.2
Subordinated Debentures Maturing July 2056 [Member] | Subordinated Debt [Member]
Derivatives, Fair Value [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				6.25%
Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	1.7	13.8	7.9
Derivative Liability, Fair Value	(22.7)	(54.5)	(57.7)
Derivative Asset, Not Subject to Master Netting Arrangement	0.3	0.1	0.2
Derivative Liability, Not Subject to Master Netting Arrangement	(0.3)	(0.1)	(0.2)
Derivative Liability, Fair Value, Amount Offset Against Collateral	(22.7)	(54.5)	(57.7)
Derivative Netting Adjustments, Liabilities		0.0	0.0
Derivative Netting Adjustments, Assets		0.0	0.0
Derivative Asset, Fair Value, Amount Offset Against Collateral	1.7	13.8	7.9
Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Not Subject to Master Netting Arrangement	0.4	0.2	1.0
Derivative Liability, Not Subject to Master Netting Arrangement	(1.6)	(1.4)	(0.7)
Interest Rate Lock Commitments
Derivatives, Fair Value [Line Items]
Derivative Asset, Not Subject to Master Netting Arrangement	5.8	11.0
Derivative Liability, Not Subject to Master Netting Arrangement	(17.2)	(1.6)
Forward purchase contracts
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	3.6	7.9	0.0
Derivative Liability, Fair Value	(64.4)	(17.7)	0.0
Derivative Asset, Not Subject to Master Netting Arrangement	0.5	0.2
Derivative Liability, Not Subject to Master Netting Arrangement	(0.3)	(0.3)
Derivative Liability, Fair Value, Amount Offset Against Collateral	(64.4)	(17.7)	0.0
Derivative Netting Adjustments, Liabilities		0.0	0.0
Derivative Netting Adjustments, Assets		0.0	0.0
Derivative Asset, Fair Value, Amount Offset Against Collateral	3.6	7.9	0.0
Forward sales contracts
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	148.8	15.5	0.0
Derivative Liability, Fair Value	(6.2)	(17.6)	0.0
Derivative Asset, Not Subject to Master Netting Arrangement	0.5	0.3
Derivative Liability, Not Subject to Master Netting Arrangement	(0.2)	(0.1)
Derivative Liability, Fair Value, Amount Offset Against Collateral	(6.2)	(17.6)	0.0
Derivative Netting Adjustments, Liabilities		0.0	0.0
Derivative Netting Adjustments, Assets		0.0	0.0
Derivative Asset, Fair Value, Amount Offset Against Collateral	148.8	15.5	0.0
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	159.9	35.2	1.2
Derivative Liability, Fair Value	(90.2)	(38.8)	(0.9)
Derivative, Notional Amount	439,646.4	479,383.1	122.8
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	0.3	0.1	0.2
Derivative Liability, Fair Value	(0.3)	(0.1)	(0.2)
Derivative, Notional Amount	64.1	4.1	3.5
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	0.4	0.2	1.0
Derivative Liability, Fair Value	(1.6)	(1.4)	(0.7)
Derivative, Notional Amount	151.9	180.1	119.3
Not Designated as Hedging Instrument [Member] | Interest Rate Lock Commitments
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	5.8	11.0	0.0
Derivative Liability, Fair Value	(17.2)	(1.6)	0.0
Derivative, Notional Amount	2,419.6	3,033.2	0.0
Not Designated as Hedging Instrument [Member] | Forward purchase contracts
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	4.1	8.1	0.0
Derivative Liability, Fair Value	(64.7)	(18.0)	0.0
Derivative, Notional Amount	5,018.8	11,713.5	0.0
Not Designated as Hedging Instrument [Member] | Forward sales contracts
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	149.3	15.8	0.0
Derivative Liability, Fair Value	(6.4)	(17.7)	0.0
Derivative, Notional Amount	9,557.0	17,358.5	0.0
Not Designated as Hedging Instrument [Member] | Futures purchase contracts
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	0.0	0.0	0.0
Derivative Liability, Fair Value	0.0	0.0	0.0
Derivative, Notional Amount	202,818.0	218,053.7	0.0
Not Designated as Hedging Instrument [Member] | Futures sales contracts
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	0.0	0.0	0.0
Derivative Liability, Fair Value	0.0	0.0	0.0
Derivative, Notional Amount	219,617.0	229,040.0	0.0
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	1.7	13.8	7.9
Derivative Liability, Fair Value	(22.7)	(54.5)	(57.7)
Derivative, Notional Amount	498.5	1,382.8	1,685.9
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	1.7	13.8	7.9
Derivative Liability, Fair Value	(22.7)	(54.5)	(57.7)
Derivative, Notional Amount	$ 498.5	$ 1,382.8	$ 1,685.9

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Derivatives and Hedging Pre-Tax Net Gains (Losses) on Fair Value Hedges (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Interest Income
Derivative Instruments, Gain (Loss) [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	$ 33.5	$ 38.7
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	(33.4)	(38.7)
Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	0.0	(5.7)
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	$ 0.0	$ 5.7

XML

Derivatives and Hedging Largest Exposure to Individual Counterparty (Detail) - Individual Counterparty - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Largest gross exposure (positive derivative NPV) to an individual counterparty	$ 0.0	$ 2.7	$ 3.9
Collateral posted by this counterparty	0.0	0.0	0.0
Negative derivative NPV with this counterparty	0.0	0.0	0.0
Collateral pledged to this counterparty	0.0	0.0	0.0
Net exposure after netting adjustments and collateral	$ 0.0	$ 2.7	$ 7.9

XML

Derivatives and Hedging Additional Information (Detail) - USD ($)		3 Months Ended
		Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Jun. 16, 2016
Derivative [Line Items]
Hedged Asset, Fair Value Hedge		$ 474,000,000.0	$ 1,390,700,000
Fair Value Hedge Assets, Loans	[1]	20,700,000	38,500,000
Derivative Liability, Fair Value		158,200,000	96,300,000	$ 57,700,000
Derivative Liability, Fair Value of Collateral		45,000,000	67,100,000	93,200,000
Net gain on loan origination and sale activities
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net		216,800,000
Loan servicing fees, net
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net		(56,900,000)
Interest Rate Lock Commitments | Net gain on loan origination and sale activities
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net		(20,800,000)
Forward Contracts | Net gain on loan origination and sale activities
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net		241,300,000
Forward Contracts | Loan servicing fees, net
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net		(34,900,000)
Swaption | Loan servicing fees, net
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net		0
Future | Loan servicing fees, net
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net		(22,000,000.0)
Other Contract | Net gain on loan origination and sale activities
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net		(3,700,000)
Subordinated Debentures Maturing July 2056 [Member] | Subordinated Debt [Member]
Derivative [Line Items]
Debt Instrument, Face Amount					$ 175,000,000
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liability, Fair Value		$ 22,700,000	$ 54,500,000	$ 57,700,000

[1] Included in the carrying value of the hedged assets/(liabilities).(2)As of December 31, 2021, included last-of-layer derivative instruments, with $880 million designated as the hedged amount (from a closed portfolio of prepayable fixed rate loans with a carrying value of $1.4 billion). The cumulative basis adjustment included in the carrying value of these hedged items totaled $15.7 million and the basis adjustment related to the discontinued portion was $1.0 million as of December 31, 2021.

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Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share [Abstract]
Basic	106.0	100.8
Weighted Average Number Diluted Shares Outstanding Adjustment	0.6	0.6
Diluted	106.6	101.4
Net income available to common shareholders	$ 236,900	$ 192,500
Earnings (loss) per share - basic	$ 2.23	$ 1.91
Earnings (loss) per share - diluted	$ 2.22	$ 1.90
Anti-dilutive stock options outstanding that were not included in computation of diluted earnings per common share	0.0	0.0

XML

Income Taxes Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Operating Loss Carryforwards [Line Items]
Effective Income Tax Rate Reconciliation, Percent	19.50%	17.90%
Deferred Income Tax Assets, Net	$ 67,600		$ 20,900
Increase (Decrease) in Deferred Income Taxes	46,700
Investments in LIHTC and renewable energy	729,900		631,300
Investment-related Liabilities	445,900		360,800
Amortization of tax credit investments	13,400	$ 15,500
Deferred Tax Assets, Valuation Allowance	$ 0		$ 0

XML

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Loss Contingencies [Line Items]
Letters of credit expiration period	1 year
Off-Balance Sheet, Credit Loss, Liability	$ 43.3	$ 37.6	$ 32.6	$ 37.0
Percentage of first liens initial loan to value ratio	75.00%
Percentage Of Commercial Real Estate Loans Occupied By Owners	21.00%	23.00%
Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member] | Credit Concentration Risk [Member]
Loss Contingencies [Line Items]
Percent of commercial real estate related loans	29.00%
Unfunded Loan Commitment [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual	$ 43.3	$ 37.6

XML

Commitments and Contingencies - Summary of Contractual Amounts for Unfunded Commitments and Letters of Credit (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Other Commitments [Line Items]
Total amount	$ 15,405.8	$ 13,900.7
Percentage Of Commercial Real Estate Loans Occupied By Owners	21.00%	23.00%
Commitments to extend credit [Member]
Other Commitments [Line Items]
Unsecured Loan Commitments	$ 1,205.2	$ 1,199.8
Total amount	14,884.8	13,396.3
Credit card guarantees [Member]
Other Commitments [Line Items]
Total amount	319.2	306.3
Standby letters of credit [Member]
Other Commitments [Line Items]
Total amount	201.8	198.1
Unsecured Letters Of Credit	$ 2.6	$ 12.9
Commercial Real Estate Portfolio Segment [Member] | Credit Concentration Risk [Member] | Loans Receivable [Member]
Other Commitments [Line Items]
Concentration Risk, Percentage	29.00%

XML

Commitments and Contingencies Lease Commitments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Lease, Cost	$ 5.9	$ 3.7
Lessee, operating lease, other cost	1.1	1.0
Other Commitments [Line Items]
Lease, Cost	5.9	3.7
Lessee, operating lease, other cost	$ 1.1	$ 1.0

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Fair Value Accounting - Gains and Losses from Fair Value Changes Included in Consolidated Statement of Operations (Detail) $ in Millions		3 Months Ended		12 Months Ended
		Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Subordinated Debt Obligations, Fair Value Disclosure		$ 64.5		$ 67.4
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Unrealized Gain (Loss) Arising During Period, after Tax		$ 2.2	$ 0.3
Junior Subordinated Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Measurement Input		0.0380		0.0261
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss)		$ 2.9	(0.4)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)	[1]	$ 2.9	$ (0.4)
Period of basis point spread		2.84%		2.40%
Percentage of LIBOR		0.96%		0.21%

[1] Unrealized gains/(losses) attributable to changes in the fair value of junior subordinated debt are recorded as part of OCI, net of tax, and totaled $2.2 million and $(0.3) million for three months ended March 31, 2022 and 2021, respectively.

XML

Fair Value Accounting - Fair Value of Assets and Liabilities (Detail)		3 Months Ended
		Mar. 31, 2022 USD ($) percent		Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) percent
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity		$ 164,700,000	[1]		$ 158,500,000	[2]
Subordinated Debt Obligations, Fair Value Disclosure		64,500,000			67,400,000
Servicing Asset at Fair Value, Amount		$ 950,300,000			$ 698,000,000.0
Minimum | Recapture Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input | percent		0.200			0.200
Minimum | Conditional Prepayment Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input | percent		0.089			0.099
Maximum | Recapture Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input | percent		0.200			0.200
Maximum | Conditional Prepayment Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input | percent		0.172			0.207
Weighted Average | Recapture Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input | percent		20			20
Weighted Average | Conditional Prepayment Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input | percent		13			15.2
Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity		$ 164,700,000			$ 158,500,000
Derivative Liability		177,800,000	[3]		99,800,000
Largest gross exposure (positive derivative NPV) to an individual counterparty		161,700,000	[3]		50,200,000
Loans Held-for-sale, Fair Value Disclosure		2,948,400,000			3,939,700,000
Servicing Asset at Fair Value, Amount		950,300,000			698,000,000.0
Fair Value, Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity		138,600,000			141,300,000
Subordinated Debt Obligations, Fair Value Disclosure		0			0
Derivative Liability		0	[3]		0
Largest gross exposure (positive derivative NPV) to an individual counterparty		0	[3]		0
Loans Held-for-sale, Fair Value Disclosure		0			0
Servicing Asset at Fair Value, Amount		0			0
Fair Value, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity		26,100,000			17,200,000
Subordinated Debt Obligations, Fair Value Disclosure		0			0
Derivative Liability		160,600,000	[3]		98,200,000
Largest gross exposure (positive derivative NPV) to an individual counterparty		155,900,000	[3]		39,200,000
Loans Held-for-sale, Fair Value Disclosure		2,940,500,000			3,894,200,000
Servicing Asset at Fair Value, Amount		0			0
Fair Value, Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity		0			0
Subordinated Debt Obligations, Fair Value Disclosure		64,500,000			67,400,000
Derivative Liability		17,200,000	[3]		1,600,000
Largest gross exposure (positive derivative NPV) to an individual counterparty		5,800,000	[3]		11,000,000.0
Loans Held-for-sale, Fair Value Disclosure		7,900,000			45,500,000
Servicing Asset at Fair Value, Amount		950,300,000			698,000,000.0
Reported Value Measurement [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity		164,700,000			158,500,000
Derivative Liability		177,800,000			99,800,000
Largest gross exposure (positive derivative NPV) to an individual counterparty		161,700,000			50,200,000
Estimate of Fair Value Measurement [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity		164,700,000			158,500,000
Derivative Liability		177,800,000			99,800,000
Largest gross exposure (positive derivative NPV) to an individual counterparty		161,700,000			50,200,000
Estimate of Fair Value Measurement [Member] | Fair Value, Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity		138,600,000			141,300,000
Derivative Liability		0			0
Largest gross exposure (positive derivative NPV) to an individual counterparty		0			0
Estimate of Fair Value Measurement [Member] | Fair Value, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity		26,100,000			17,200,000
Derivative Liability		160,600,000			98,200,000
Largest gross exposure (positive derivative NPV) to an individual counterparty		155,900,000			39,200,000
Estimate of Fair Value Measurement [Member] | Fair Value, Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity		0			0
Derivative Liability		17,200,000			1,600,000
Largest gross exposure (positive derivative NPV) to an individual counterparty		5,800,000			11,000,000.0
Junior Subordinated Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss)		2,900,000		$ (400,000)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)	[4]	2,900,000		$ (400,000)
Junior Subordinated Debt [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Subordinated Debt Obligations, Fair Value Disclosure		$ 64,500,000			$ 67,400,000

[1] ratings differ, the Company uses an average of the available ratings by major credit agencies.

[2] For rated securities, if ratings differ, the Company uses an average of the available ratings by major credit agencies.

[3] See "Note 11. Derivatives and Hedging Activities." In addition, the carrying value of loans is increased by $20.7 million as of March 31, 2022 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.

[4] Unrealized gains/(losses) attributable to changes in the fair value of junior subordinated debt are recorded as part of OCI, net of tax, and totaled $2.2 million and $(0.3) million for three months ended March 31, 2022 and 2021, respectively.

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Fair Value Accounting - Change in Level 3 Liabilities Measured at Fair Value on Recurring Basis (Detail) $ in Millions		3 Months Ended		12 Months Ended
		Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Unrealized Gain (Loss) Arising During Period, after Tax		$ (2.2)	$ (0.3)
Junior subordinated debt		64.5		$ 67.4
Loans held for sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3		(38.5)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		7.9		45.5
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases		292.2
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales		(350.7)
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss)		0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3		(17.6)
Interest Rate Lock Commitments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		(11.4)		9.4
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases		5,323.3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances		(5,321.1)
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss)		(11.4)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		(23.0)
Servicing Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		950.3		698.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases		204.1
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales		0.0
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss)		80.4
Realization of expected cash flows		(33.2)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		81.4
Fair Value, Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Junior subordinated debt		$ 64.5		$ 67.4
Loans and Finance Receivables [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Processes, Description		Discounted cash flow method		Discounted cash flow method
Other Assets [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Processes, Description		Collateral method		Collateral method
Junior Subordinated Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)	[1]	$ 2.9	(0.4)
Debt Instrument, Measurement Input		0.0380		0.0261
Junior Subordinated Debt [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Junior subordinated debt		$ 64.5		$ 67.4
Fair Value Measurements, Valuation Processes, Description		Implied credit rating of the Company		Implied credit rating of the Company
Junior Subordinated Debt [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning balance		$ (67.4)	65.9	$ 65.9
Closing balance		$ (64.5)	$ (66.3)	$ (67.4)
Valuation Technique, Discounted Cash Flow [Member] | Junior Subordinated Debt [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Processes, Description		Discounted cash flow		Discounted cash flow
Collateral Method [Member] | Loans and Finance Receivables [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Processes, Description		Collateral method		Collateral method
Third Party Appraisal [Member] | Loans and Finance Receivables [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Processes, Description		Third party appraisal		Third party appraisal
Third Party Appraisal [Member] | Other Assets [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Processes, Description		Third party appraisal		Third party appraisal
Discount Rate [Member] | Loans and Finance Receivables [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Processes, Description		Discount rate		Discount rate

[1] Unrealized gains/(losses) attributable to changes in the fair value of junior subordinated debt are recorded as part of OCI, net of tax, and totaled $2.2 million and $(0.3) million for three months ended March 31, 2022 and 2021, respectively.

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Fair Value Accounting - Assets Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans with an allowance recorded	$ 7.0	$ 10.8
Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets acquired through foreclosure	11.7	11.7
Collateral Dependent Loans, Net of Allowance	259.6	216.0
Fair Value, Nonrecurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets acquired through foreclosure	0.0	0.0
Collateral Dependent Loans, Net of Allowance	0.0	0.0
Fair Value, Nonrecurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets acquired through foreclosure	0.0	0.0
Collateral Dependent Loans, Net of Allowance	0.0	0.0
Fair Value, Nonrecurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets acquired through foreclosure	11.7	11.7
Collateral Dependent Loans, Net of Allowance	$ 259.6	$ 216.0
Loans and Finance Receivables [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Processes, Description	Discounted cash flow method	Discounted cash flow method
Other Assets [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Processes, Description	Collateral method	Collateral method
Collateral Method [Member] | Loans and Finance Receivables [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Processes, Description	Collateral method	Collateral method
Third Party Appraisal [Member] | Loans and Finance Receivables [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Processes, Description	Third party appraisal	Third party appraisal
Level 3 Fair Value Measurement Inputs	Costs to sell	Costs to sell
Third Party Appraisal [Member] | Other Assets [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Processes, Description	Third party appraisal	Third party appraisal
Level 3 Fair Value Measurement Inputs	Costs to sell	Costs to sell
Discount Rate [Member] | Loans and Finance Receivables [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Processes, Description	Discount rate	Discount rate
Level 3 Fair Value Measurement Inputs	Contractual loan rate	Contractual loan rate
Scheduled Cash Collections [Member] | Loans and Finance Receivables [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Processes, Description	Scheduled cash collections	Scheduled cash collections
Level 3 Fair Value Measurement Inputs	Probability of default	Probability of default
Proceeds from Non-Real Estate Collateral [Member] | Loans and Finance Receivables [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Processes, Description	Proceeds from non-real estate collateral	Proceeds from non-real estate collateral
Level 3 Fair Value Measurement Inputs	Loss given default	Loss given default

XML

Fair Value Accounting - Change in Level 3 Unobservable Inputs (Detail) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2022 USD ($) percent	Dec. 31, 2021 USD ($) percent
Loans held for sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | $	$ 7.9	$ 45.5
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | $	292.2
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | $	(350.7)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | $	38.5
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) | $	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | $	0.0
Interest Rate Lock Commitments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | $	(11.4)	9.4
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | $	5,323.3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances | $	(5,321.1)
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) | $	(11.4)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | $	(23.0)
Servicing Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | $	950.3	$ 698.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | $	204.1
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | $	0.0
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) | $	80.4
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | $	81.4
Realization of expected cash flows | $	$ (33.2)
Loans and Finance Receivables [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Processes, Description	Discounted cash flow method	Discounted cash flow method
Loans and Finance Receivables [Member] | Level 3 [Member] | Scheduled Cash Collections [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Processes, Description	Scheduled cash collections	Scheduled cash collections
Level 3 Fair Value Measurement Inputs	Probability of default	Probability of default
Loans and Finance Receivables [Member] | Level 3 [Member] | Proceeds from Non-Real Estate Collateral [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Processes, Description	Proceeds from non-real estate collateral	Proceeds from non-real estate collateral
Level 3 Fair Value Measurement Inputs	Loss given default	Loss given default
Option Adjusted Spread | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	623	735
Option Adjusted Spread | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	518	600
Option Adjusted Spread | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	408	553
Conditional Prepayment Rate | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	0.172	0.207
Conditional Prepayment Rate | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	13	15.2
Conditional Prepayment Rate | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	0.089	0.099
Servicing Fee Rate | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	50.0	50.0
Servicing Fee Rate | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	30.1	29.5
Servicing Fee Rate | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	25.0	25.0
Cost to Service | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	91	91
Cost to Service | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	86	86
Cost to Service | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	84	84
Servicing Fee Multiple | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Measurement Input	5.6	5.4
Servicing Fee Multiple | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Measurement Input	4.7	4.6
Servicing Fee Multiple | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Measurement Input	3.6	3.6
Pull-through Rate | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Measurement Input	1	1
Pull-through Rate | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Measurement Input	89	90
Pull-through Rate | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Measurement Input	0.73	0.75
Whole loan spread to TBA price in basis points | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Measurement Input	(2.0)	(2.9)
Whole loan spread to TBA price in basis points | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Measurement Input	(3.1)	(3.3)
Whole loan spread to TBA price in basis points | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Measurement Input	(4.2)	(3.7)
Recapture Rate | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	0.200	0.200
Recapture Rate | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	20	20
Recapture Rate | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	0.200	0.200

XML

Fair Value Accounting - Estimated Fair Value of Financial Instruments (Detail) - USD ($) $ in Millions	Mar. 31, 2022		Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Repossessed Assets	$ 11.7		$ 11.7
Financial assets
Debt Securities, Held-to-maturity	1,161.0		1,107.1
Debt Securities, Available-for-sale	6,852.2	[1]	6,188.8	[2]
Investment securities - equity	164.7	[1]	158.5	[2]
Loans, net	40,861.5		38,822.9
Loans Receivable Held-for-sale, Amount	4,761.6		5,635.1
Servicing Asset	950.3		698.0
Accrued Investment Income Receivable	3.3		3.0
Financial liabilities
Deposits	52,159.5		47,612.0
Other borrowings	833.3		1,501.9
Junior subordinated debt	64.5		67.4
Fair Value, Nonrecurring [Member]
Financial liabilities
Other assets acquired through foreclosure	11.7		11.7
Fair Value, Nonrecurring [Member] | Level 1 [Member]
Financial liabilities
Other assets acquired through foreclosure	0.0		0.0
Fair Value, Nonrecurring [Member] | Level 2 [Member]
Financial liabilities
Other assets acquired through foreclosure	0.0		0.0
Fair Value, Nonrecurring [Member] | Level 3 [Member]
Financial liabilities
Other assets acquired through foreclosure	11.7		11.7
Fair Value, Nonrecurring [Member] | Reported Value Measurement [Member]
Financial assets
Debt Securities, Held-to-maturity	1,161.0		1,107.1
Loans, net	40,861.5		38,822.9
Accrued Investment Income Receivable	235.6		227.9
Financial liabilities
Deposits	52,159.5		47,612.0
Other borrowings	833.3		1,501.9
Junior subordinated debt	893.3		895.8
Interest Payable, Current	13.5		9.2
Fair Value, Nonrecurring [Member] | Estimate of Fair Value Measurement [Member]
Financial assets
Debt Securities, Held-to-maturity	1,139.9		1,146.4
Loans, net	41,030.6		39,218.2
Accrued Investment Income Receivable	235.6		227.9
Financial liabilities
Deposits	52,162.7		47,615.5
Other borrowings	798.2		1,518.4
Junior subordinated debt	886.5		938.6
Interest Payable, Current	13.5		9.2
Fair Value, Nonrecurring [Member] | Estimate of Fair Value Measurement [Member] | Level 1 [Member]
Financial assets
Debt Securities, Held-to-maturity	0.0		0.0
Loans, net	0.0		0.0
Accrued Investment Income Receivable	0.0		0.0
Financial liabilities
Deposits	0.0		0.0
Other borrowings	0.0		0.0
Junior subordinated debt	0.0		0.0
Interest Payable, Current	0.0		0.0
Fair Value, Nonrecurring [Member] | Estimate of Fair Value Measurement [Member] | Level 2 [Member]
Financial assets
Debt Securities, Held-to-maturity	1,139.9		1,146.4
Loans, net	0.0		0.0
Accrued Investment Income Receivable	235.6		227.9
Financial liabilities
Deposits	52,162.7		47,615.5
Other borrowings	798.2		1,518.4
Junior subordinated debt	808.7		857.3
Interest Payable, Current	13.5		9.2
Fair Value, Nonrecurring [Member] | Estimate of Fair Value Measurement [Member] | Level 3 [Member]
Financial assets
Debt Securities, Held-to-maturity	0.0		0.0
Loans, net	41,030.6		39,218.2
Accrued Investment Income Receivable	0.0		0.0
Financial liabilities
Deposits	0.0		0.0
Other borrowings	0.0		0.0
Junior subordinated debt	77.8		81.3
Interest Payable, Current	0.0		0.0
Fair Value, Recurring [Member]
Financial assets
Debt Securities, Available-for-sale	6,852.2		6,188.8
Investment securities - equity	164.7		158.5
Derivative Asset	161.7	[3]	50.2
Financial liabilities
Derivative Liability	177.8	[3]	99.8
Fair Value, Recurring [Member] | Level 1 [Member]
Financial assets
Debt Securities, Available-for-sale	27.4		40.4
Investment securities - equity	138.6		141.3
Derivative Asset	0.0	[3]	0.0
Financial liabilities
Junior subordinated debt	0.0		0.0
Derivative Liability	0.0	[3]	0.0
Fair Value, Recurring [Member] | Level 2 [Member]
Financial assets
Debt Securities, Available-for-sale	6,824.8		6,148.4
Investment securities - equity	26.1		17.2
Derivative Asset	155.9	[3]	39.2
Financial liabilities
Junior subordinated debt	0.0		0.0
Derivative Liability	160.6	[3]	98.2
Fair Value, Recurring [Member] | Level 3 [Member]
Financial assets
Debt Securities, Available-for-sale	0.0		0.0
Investment securities - equity	0.0		0.0
Derivative Asset	5.8	[3]	11.0
Financial liabilities
Junior subordinated debt	64.5		67.4
Derivative Liability	17.2	[3]	1.6
Fair Value, Recurring [Member] | Reported Value Measurement [Member]
Financial assets
Debt Securities, Available-for-sale	6,852.2		6,188.8
Investment securities - equity	164.7		158.5
Derivative Asset	161.7		50.2
Loans Receivable Held-for-sale, Amount	4,761.6		5,635.1
Servicing Asset	950.3		698.0
Financial liabilities
Derivative Liability	177.8		99.8
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member]
Financial assets
Debt Securities, Available-for-sale	6,852.2		6,188.8
Investment securities - equity	164.7		158.5
Derivative Asset	161.7		50.2
Loans Receivable Held-for-sale, Amount	4,768.8		5,654.4
Servicing Asset	950.3		698.0
Financial liabilities
Derivative Liability	177.8		99.8
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Level 1 [Member]
Financial assets
Debt Securities, Available-for-sale	27.4		40.4
Investment securities - equity	138.6		141.3
Derivative Asset	0.0		0.0
Loans Receivable Held-for-sale, Amount	0.0		0.0
Servicing Asset	0.0		0.0
Financial liabilities
Derivative Liability	0.0		0.0
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Level 2 [Member]
Financial assets
Debt Securities, Available-for-sale	6,824.8		6,148.4
Investment securities - equity	26.1		17.2
Derivative Asset	155.9		39.2
Loans Receivable Held-for-sale, Amount	2,940.5		3,894.2
Servicing Asset	0.0		0.0
Financial liabilities
Derivative Liability	160.6		98.2
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Level 3 [Member]
Financial assets
Debt Securities, Available-for-sale	0.0		0.0
Investment securities - equity	0.0		0.0
Derivative Asset	5.8		11.0
Loans Receivable Held-for-sale, Amount	1,828.3		1,760.2
Servicing Asset	950.3		698.0
Financial liabilities
Derivative Liability	$ 17.2		$ 1.6

[1] ratings differ, the Company uses an average of the available ratings by major credit agencies.

[2] For rated securities, if ratings differ, the Company uses an average of the available ratings by major credit agencies.

[3] See "Note 11. Derivatives and Hedging Activities." In addition, the carrying value of loans is increased by $20.7 million as of March 31, 2022 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.

XML

Fair Value Accounting - Additional Information (Detail)	3 Months Ended		12 Months Ended
	Mar. 31, 2022 USD ($) percent shares		Dec. 31, 2021 USD ($) percent shares		Jan. 25, 2022 USD ($)	Apr. 07, 2021 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets acquired through foreclosure	$ 11,700,000		$ 11,700,000
Goodwill					$ 40,000,000.0	$ 199,800,000
Common Stock, Shares, Issued | shares	110,824,061		108,981,341
Loans Held-for-sale, Fair Value Disclosure	$ 2,948,400,000		$ 3,939,700,000
Financing Receivable, 90 Days or More Past Due, Still Accruing	2,000,000.0		2,200,000
Fair Value, Option, Loans Held as Assets, Aggregate Difference	9,400,000		130,200,000
Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due, Aggregate Difference	(100,000)		0
UPB, Option, Loans Held as Assets, Current Through 89 Days	2,936,900,000		3,807,300,000
Fair Value, Option, Loans Held as Assets, Current Through 89 days, Aggregate Difference	9,500,000		130,200,000
UPB, Option, Loans Held as Assets, 90 Days or More Past Due	2,100,000		2,200,000
Investment securities - equity	164,700,000	[1]	158,500,000	[2]
Debt Securities, Available-for-sale	6,852,200,000	[1]	6,188,800,000	[2]
Fair Value, Option, Loans Held as Assets, Current Through 89 Days	2,946,400,000		3,937,500,000
Servicing Asset at Fair Value, Amount	$ 950,300,000		$ 698,000,000.0
Minimum | Option Adjusted Spread
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input | percent	408		553
Minimum | Conditional Prepayment Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input | percent	0.089		0.099
Minimum | Servicing Fee Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input | percent	25.0		25.0
Minimum | Cost to Service
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input | percent	84		84
Minimum | Whole loan spread to TBA price in basis points
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Measurement Input | percent	(4.2)		(3.7)
Minimum | Servicing Fee Multiple
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Measurement Input | percent	3.6		3.6
Minimum | Pull-through Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Measurement Input | percent	0.73		0.75
Minimum | Recapture Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input | percent	0.200		0.200
Maximum | Option Adjusted Spread
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input | percent	623		735
Maximum | Conditional Prepayment Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input | percent	0.172		0.207
Maximum | Servicing Fee Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input | percent	50.0		50.0
Maximum | Cost to Service
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input | percent	91		91
Maximum | Whole loan spread to TBA price in basis points
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Measurement Input | percent	(2.0)		(2.9)
Maximum | Servicing Fee Multiple
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Measurement Input | percent	5.6		5.4
Maximum | Pull-through Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Measurement Input | percent	1		1
Maximum | Recapture Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input | percent	0.200		0.200
Weighted Average | Option Adjusted Spread
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input | percent	518		600
Weighted Average | Conditional Prepayment Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input | percent	13		15.2
Weighted Average | Servicing Fee Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input | percent	30.1		29.5
Weighted Average | Cost to Service
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input | percent	86		86
Weighted Average | Whole loan spread to TBA price in basis points
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Measurement Input | percent	(3.1)		(3.3)
Weighted Average | Servicing Fee Multiple
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Measurement Input | percent	4.7		4.6
Weighted Average | Pull-through Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Measurement Input | percent	89		90
Weighted Average | Recapture Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input | percent	20		20
Collateralized Loan Obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	$ 2,055,300,000		$ 926,200,000
Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	62,200,000		68,500,000
Corporate Bond Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	415,300,000		382,900,000
Residential Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	1,343,200,000		1,508,000,000
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	1,905,000,000		1,993,400,000
Nontaxable Municipal Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	992,900,000		1,215,100,000
US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale			13,000,000.0
Other Security Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	78,300,000		81,700,000
CRA investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity	52,300,000		44,600,000
Preferred Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity	112,400,000		113,900,000
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans with an allowance recorded	$ 7,000,000		$ 10,800,000
Junior Subordinated Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Period of basis point spread	2.84%		2.40%
Percentage of LIBOR	0.96%		0.21%
Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral Dependent Loans, Net of Allowance	$ 259,600,000		$ 216,000,000.0
Fair Value, Nonrecurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral Dependent Loans, Net of Allowance	259,600,000		216,000,000.0
Fair Value, Nonrecurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral Dependent Loans, Net of Allowance	0		0
Fair Value, Nonrecurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral Dependent Loans, Net of Allowance	0		0
Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing Receivable Unpaid Principal Balance	2,939,000,000		3,809,500,000
Investment securities - equity	164,700,000		158,500,000
Debt Securities, Available-for-sale	6,852,200,000		6,188,800,000
Servicing Asset at Fair Value, Amount	950,300,000		698,000,000.0
Fair Value, Recurring [Member] | Collateralized Loan Obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	2,055,300,000		926,200,000
Fair Value, Recurring [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	62,200,000		68,500,000
Fair Value, Recurring [Member] | Corporate Bond Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	415,300,000		382,900,000
Fair Value, Recurring [Member] | Residential Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	1,343,200,000		1,508,000,000
Fair Value, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	1,905,000,000		1,993,400,000
Fair Value, Recurring [Member] | Nontaxable Municipal Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	992,900,000		1,215,100,000
Fair Value, Recurring [Member] | US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale			13,000,000.0
Fair Value, Recurring [Member] | Other Security Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	78,300,000		81,700,000
Fair Value, Recurring [Member] | CRA investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity	52,300,000		44,600,000
Fair Value, Recurring [Member] | Preferred Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity	112,400,000		113,900,000
Fair Value, Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity	0		0
Debt Securities, Available-for-sale	0		0
Servicing Asset at Fair Value, Amount	950,300,000		698,000,000.0
Fair Value, Recurring [Member] | Level 3 [Member] | Collateralized Loan Obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	0		0
Fair Value, Recurring [Member] | Level 3 [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	0		0
Fair Value, Recurring [Member] | Level 3 [Member] | Corporate Bond Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	0		0
Fair Value, Recurring [Member] | Level 3 [Member] | Residential Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	0		0
Fair Value, Recurring [Member] | Level 3 [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	0		0
Fair Value, Recurring [Member] | Level 3 [Member] | Nontaxable Municipal Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	0		0
Fair Value, Recurring [Member] | Level 3 [Member] | US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale			0
Fair Value, Recurring [Member] | Level 3 [Member] | Other Security Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	0		0
Fair Value, Recurring [Member] | Level 3 [Member] | CRA investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity	0		0
Fair Value, Recurring [Member] | Level 3 [Member] | Preferred Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity	0		0
Fair Value, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity	26,100,000		17,200,000
Debt Securities, Available-for-sale	6,824,800,000		6,148,400,000
Servicing Asset at Fair Value, Amount	0		0
Fair Value, Recurring [Member] | Level 2 [Member] | Collateralized Loan Obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	2,055,300,000		926,200,000
Fair Value, Recurring [Member] | Level 2 [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	62,200,000		68,500,000
Fair Value, Recurring [Member] | Level 2 [Member] | Corporate Bond Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	415,300,000		382,900,000
Fair Value, Recurring [Member] | Level 2 [Member] | Residential Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	1,343,200,000		1,508,000,000
Fair Value, Recurring [Member] | Level 2 [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	1,905,000,000		1,993,400,000
Fair Value, Recurring [Member] | Level 2 [Member] | Nontaxable Municipal Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	992,900,000		1,215,100,000
Fair Value, Recurring [Member] | Level 2 [Member] | US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale			0
Fair Value, Recurring [Member] | Level 2 [Member] | Other Security Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	50,900,000		54,300,000
Fair Value, Recurring [Member] | Level 2 [Member] | CRA investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity	26,100,000		17,200,000
Fair Value, Recurring [Member] | Level 2 [Member] | Preferred Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity	0		0
Fair Value, Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity	138,600,000		141,300,000
Debt Securities, Available-for-sale	27,400,000		40,400,000
Servicing Asset at Fair Value, Amount	0		0
Fair Value, Recurring [Member] | Level 1 [Member] | Collateralized Loan Obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	0		0
Fair Value, Recurring [Member] | Level 1 [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	0		0
Fair Value, Recurring [Member] | Level 1 [Member] | Corporate Bond Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	0		0
Fair Value, Recurring [Member] | Level 1 [Member] | Residential Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	0		0
Fair Value, Recurring [Member] | Level 1 [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	0		0
Fair Value, Recurring [Member] | Level 1 [Member] | Nontaxable Municipal Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	0		0
Fair Value, Recurring [Member] | Level 1 [Member] | US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale			13,000,000.0
Fair Value, Recurring [Member] | Level 1 [Member] | Other Security Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	27,400,000		27,400,000
Fair Value, Recurring [Member] | Level 1 [Member] | CRA investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity	26,200,000		27,400,000
Fair Value, Recurring [Member] | Level 1 [Member] | Preferred Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity	$ 112,400,000		$ 113,900,000

[1] ratings differ, the Company uses an average of the available ratings by major credit agencies.

[2] For rated securities, if ratings differ, the Company uses an average of the available ratings by major credit agencies.

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Segments - Operating Segment Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Operating Statistics [Line Items]
Service charges and fees	$ 7.0	$ 6.7
Cash, Cash Equivalents and Investment Securities	10,878.9		$ 8,057.3
Loans Receivable Held-for-sale, Amount	4,761.6		5,635.1
Loans and Leases Receivable, Net of Deferred Income	41,119.1		39,075.4
Less: Allowance for credit losses	(257.6)		(252.5)
Loans, net	40,861.5		38,822.9
Other Repossessed Assets	11.7		11.7
Goodwill and intangible assets, net	698.2		634.8
Other Assets Segment	3,364.2		2,820.8
Assets	60,576.1		55,982.6
Deposits	52,159.5		47,612.0
Other borrowings	1,726.6		2,381.1
Other Liabilities Segment	1,678.4		1,026.9
Total liabilities	55,564.5		51,020.0
Stockholders' equity	5,011.6	3,712.7	4,962.6	$ 3,413.5
Liabilities and Equity	60,576.1		55,982.6
Excess Funds Provided by (Used in) Segment Basis	0.0		0.0
Net interest income	449.5	317.3
Provision for Loan, Lease, and Other Losses	9.0	32.4
Net interest income (loss) after provision for credit losses	440.5	349.7
Noninterest Income	106.3	19.7
Non-interest expense	(248.6)	(135.0)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	298.2	234.4
Income tax expense (benefit)	58.1	41.9
Net income	240.1	192.5
Operating Segments [Member] | Commercial Segment
Operating Statistics [Line Items]
Cash, Cash Equivalents and Investment Securities	15.6		12.9
Loans Receivable Held-for-sale, Amount	0.0		0.0
Loans and Leases Receivable, Net of Deferred Income	25,794.8		25,092.4
Less: Allowance for credit losses	221.3		226.0
Loans, net	25,573.5		24,866.4
Other Repossessed Assets	11.7		11.7
Goodwill and intangible assets, net	294.3		294.7
Other Assets Segment	253.2		253.8
Assets	26,148.3		25,439.5
Deposits	30,133.6		30,466.8
Other borrowings	18.0		0.0
Other Liabilities Segment	268.1		233.4
Total liabilities	30,419.7		30,700.2
Stockholders' equity	2,661.8		2,588.0
Liabilities and Equity	33,081.5		33,288.2
Excess Funds Provided by (Used in) Segment Basis	(6,933.2)		(7,848.7)
Net interest income	334.9	263.7
Provision for Loan, Lease, and Other Losses	0.6	36.3
Net interest income (loss) after provision for credit losses	334.3	300.0
Noninterest Income	16.9	19.2
Non-interest expense	(114.4)	(98.3)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	236.8	220.9
Income tax expense (benefit)	56.2	52.7
Net income	180.6	168.2
Operating Segments [Member] | Consumer Related Segment
Operating Statistics [Line Items]
Cash, Cash Equivalents and Investment Securities	97.0		82.4
Loans Receivable Held-for-sale, Amount	4,761.6		5,635.1
Loans and Leases Receivable, Net of Deferred Income	15,324.3		13,983.0
Less: Allowance for credit losses	36.3		26.5
Loans, net	15,288.0		13,956.5
Other Repossessed Assets	0.0		0.0
Goodwill and intangible assets, net	403.9		340.1
Other Assets Segment	1,594.8		1,278.1
Assets	22,145.3		21,292.2
Deposits	18,527.6		15,362.9
Other borrowings	369.8		353.2
Other Liabilities Segment	170.3		138.2
Total liabilities	19,067.7		15,854.3
Stockholders' equity	1,752.1		1,596.2
Liabilities and Equity	20,819.8		17,450.5
Excess Funds Provided by (Used in) Segment Basis	(1,325.5)		(3,841.7)
Net interest income	183.2	107.9
Provision for Loan, Lease, and Other Losses	10.5	1.7
Net interest income (loss) after provision for credit losses	172.7	106.2
Noninterest Income	79.2	0.5
Non-interest expense	(125.0)	(35.2)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	126.9	71.5
Income tax expense (benefit)	30.4	17.5
Net income	96.5	54.0
Corporate & Other
Operating Statistics [Line Items]
Cash, Cash Equivalents and Investment Securities	10,766.3		7,962.0
Loans Receivable Held-for-sale, Amount	0.0		0.0
Loans and Leases Receivable, Net of Deferred Income	0.0		0.0
Less: Allowance for credit losses	0.0		0.0
Loans, net	0.0		0.0
Other Repossessed Assets	0.0		0.0
Goodwill and intangible assets, net	0.0		0.0
Other Assets Segment	1,516.2		1,288.9
Assets	12,282.5		9,250.9
Deposits	3,498.3		1,782.3
Other borrowings	1,338.8		2,027.9
Other Liabilities Segment	1,240.0		655.3
Total liabilities	6,077.1		4,465.5
Stockholders' equity	597.7		778.4
Liabilities and Equity	6,674.8		5,243.9
Excess Funds Provided by (Used in) Segment Basis	5,607.7		$ 4,007.0
Net interest income	(68.6)	(54.3)
Provision for Loan, Lease, and Other Losses	(2.1)	2.2
Net interest income (loss) after provision for credit losses	(66.5)	(56.5)
Noninterest Income	10.2	0.0
Non-interest expense	(9.2)	(1.5)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	(65.5)	(58.0)
Income tax expense (benefit)	(28.5)	(28.3)
Net income	$ (37.0)	$ (29.7)

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Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Service charges and fees	$ 7.0	$ 6.7
Noninterest Income	106.3	19.7
Revenue from Contracts with Customers	14.4	9.2
Operating Segments [Member] | Commercial Segment
Disaggregation of Revenue [Line Items]
Noninterest Income	16.9	19.2
Operating Segments [Member] | Consumer Related Segment
Disaggregation of Revenue [Line Items]
Noninterest Income	79.2	0.5
Corporate & Other
Disaggregation of Revenue [Line Items]
Noninterest Income	$ 10.2	$ 0.0

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Subsequent Events (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Subsequent Event [Line Items]
Business Combination, Consideration Transferred	$ 67.8	$ 1,918.4
Payments to Acquire Businesses, Gross	$ 50.6	$ 1,231.6	$ 1,200.0