Western Alliance Bancorporation (WAL) 10-Q 1 Nov 22 2022 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2022	Oct. 27, 2022
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 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	Q3
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		108,912,097
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

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($) $ / shares shares		Sep. 30, 2022 USD ($) $ / shares shares		Dec. 31, 2021 USD ($) $ / shares shares
Assets:
Cash and due from banks	$ 260		$ 260		$ 166
Interest-bearing deposits in other financial institutions	1,350		1,350		350
Cash, cash equivalents and restricted cash	1,610		1,610		516
Debt Securities, Available-for-sale	6,960	[1]	6,960	[1]	6,189	[2]
Debt Securities, Held-to-maturity, Net of Allowance	1,266		1,266		1,102
Debt Securities, Held-to-maturity, Allowance for Credit Loss	(4.4)		(4.4)		(5.2)
Investment securities - equity	165	[1]	165	[1]	159	[2]
Investments in restricted stock, at cost	212		212		92
Loans Receivable Held-for-sale, Amount	2,204		2,204		5,635
Loans:
Loans and Leases Receivable, Net of Deferred Income	52,201		52,201		39,075
Less: Allowance for credit losses	(304.1)		(304.1)		(252.5)
Net loans held for investment	51,897		51,897		38,823
Servicing Asset	1,044		1,044		698
Premises and equipment, net	237		237		182
Operating Lease, Right-of-Use Asset	131		131		133
Bank owned life insurance	181		181		180
Goodwill and intangible assets, net	682		682		635
Deferred Income Tax Assets, Net	302		302		21
Investments in LIHTC and renewable energy	727		727		631
Other assets	1,547		1,547		987
Total assets	69,165		69,165		55,983
Deposits:
Non-interest-bearing demand	24,926		24,926		21,353
Interest-bearing	30,663		30,663		26,259
Total deposits	55,589		55,589		47,612
Customer repurchase agreements	26		26		17
Other borrowings	6,319		6,319		1,502
Qualifying debt	889		889		896
Operating Lease, Liability	149		149		143
Other liabilities	1,198		1,198		867
Total liabilities	64,144		64,144		51,020
Commitments and Contingencies
Preferred Stock, Shares Outstanding | shares	12,000,000		12,000,000		12,000,000
Preferred Stock, Shares Authorized | shares	20,000,000		20,000,000		20,000,000
Preferred Stock, Liquidation Preference Per Share | $ / shares	$ 25		$ 25		$ 25
Preferred Stock, Par or Stated Value Per Share | $ / shares	$ 0.0001		$ 0.0001		$ 0.0001
Preferred Stock, Value, Issued	$ 295		$ 295		$ 295
Common Stock, Shares, Issued | shares	111,466,865		111,466,865		108,981,341
Common stock, shares authorized | shares	200,000,000		200,000,000		200,000,000
Stockholders’ equity:
Common Stock, Value, Issued	$ 2,154		$ 2,154		$ 1,966
Treasury Stock, Value	(105)		(105)		(87)
Accumulated other comprehensive (loss) income	(736.2)		(736.2)		15.7
Retained earnings	3,413		3,413		2,773
Total stockholders’ equity	5,020.8		5,020.8		4,962.6
Total liabilities and stockholders’ equity	69,165		69,165		55,983
Dividends, Common Stock, Cash	(39)		(114.2)
Debt Securities, Held-to-maturity, Fair Value	$ 1,084		$ 1,084		$ 1,146
Common stock, par value | $ / shares	$ 0.0001		$ 0.0001		$ 0.0001
Treasury Stock, Shares | shares	2,549,229		2,549,229		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.

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale, Amortized Cost	$ 7,944	$ 6,167
Debt Securities, Held-to-maturity, Fair Value	$ 1,084	$ 1,146
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	111,466,865	108,981,341
Treasury Stock, Value	$ 105	$ 87

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands, shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Interest income:
Loans, including fees	$ 657,000	$ 398,000	$ 1,608,300	$ 1,050,200
Investment securities	74,000	42,000	178,300	116,600
Dividends and other	8,400	2,800	16,900	8,600
Total interest income	739,400	442,800	1,803,500	1,175,400
Interest expense:
Deposits	77,600	12,300	118,800	34,700
Qualifying debt	8,900	10,800	25,900	23,900
Other borrowings	50,800	9,300	82,200	18,600
Total interest expense	137,300	32,400	226,900	77,200
Net interest income	602,100	410,400	1,576,600	1,098,200
Provision for (recovery of) credit losses	(28,500)	12,300	(65,000)	(34,600)
Net interest income after provision for (recovery of) credit losses	573,600	398,100	1,511,600	1,132,800
Net gain on loan origination and sale activities	14,500	121,000	78,600	253,000
Non-interest income:
Service charges and fees	6,500	7,100	21,100	21,200
Income from equity instruments	4,300	2,500	13,600	16,900
Commercial banking related income	5,100	4,600	16,000	12,500
Unrealized gains (losses) on assets measured at fair value, net	(2,800)	(2,200)	(19,400)	(500)
Loan servicing fees, net	23,000	2,200	109,500	(18,600)
Other income	10,800	2,900	25,300	9,200
Total non-interest income	61,800	138,100	263,100	293,800
Non-interest expense:
Salaries and employee benefits	136,500	133,500	413,800	346,100
Expense Related to Distribution or Servicing and Underwriting Fees	15,200	15,600	40,700	37,900
Legal, professional, and directors' fees	24,800	13,700	73,900	37,800
Loan Processing Fee	5,800	9,700	18,700	20,200
Occupancy	13,900	12,400	39,700	31,400
Data processing	21,800	15,400	59,100	40,300
Deposit costs	56,200	7,300	83,600	20,700
Insurance	8,100	6,200	22,200	15,900
Business development and marketing	5,000	2,800	14,800	7,400
Net gain on sales and valuations of repossessed and other assets	(200)	(1,300)	(400)	(3,100)
Acquisition and restructure expenses	0	2,400	400	18,500
Other expense	18,700	16,100	56,800	40,500
Total non-interest expense	305,800	233,800	823,300	613,600
Income before provision for income taxes	329,600	302,400	951,400	813,000
Income Tax Expense (Benefit)	65,600	65,500	187,100	159,800
Net income	264,000	236,900	764,300	653,200
Net income available to common shareholders	$ 260,800	$ 236,900	$ 754,700	$ 653,200
Earnings per share:
Basic	$ 2.43	$ 2.29	$ 7.06	$ 6.39
Diluted	$ 2.42	$ 2.28	$ 7.03	$ 6.35
Weighted average number of common shares outstanding:
Basic	107.5	103.3	107	102.3
Diluted	107.9	103.9	107.4	102.9
Dividends declared per common share	$ 0.36	$ 0.35	$ 1.06	$ 0.85
Gain on sales of investment securities	$ 0	$ 0	$ (6,700)	$ (100)
Gain on recovery from credit guarantees	400	0	11,700	0
Preferred Stock Dividends, Income Statement Impact	$ 3,200	$ 0	$ 9,600	$ 0

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 264	$ 236.9	$ 764.3	$ 653.2
Other comprehensive income (loss), net:
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax	(219.9)	(21.8)	(752.3)	(49)
Unrealized loss on AFS securities, net of tax effect of $74.2, $7.1, $248.2, and $16.0 respectively	74.2	7.1	248.2	16
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Unrealized Gain (Loss) Arising During Period, after Tax	(1.6)	(0.1)	5.8	(0.6)
Unrealized gain (loss) on junior subordinated debt, net of tax effect of $(0.5), $0.1, $(1.9), and $0.2 respectively	0.5	0.1	1.9	0.2
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	0	0	(5.4)	(0.1)
Realized gain on sale of AFS securities included in income, net of tax effect of $0.0, $(0.0), $1.8, and $0.0 respectively	0	0	(1.8)	0
Net other comprehensive loss	(218.3)	(21.9)	(751.9)	(49.7)
Comprehensive income	$ 45.7	$ 215	$ 12.4	$ 603.5

CONSOLIDATED STATEMENTS OF STOC

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	$ 1,390.9	$ 71.1	$ 92.3	$ 2,001.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	653.2					653.2
Restricted stock grants, net, shares		(600,000)
Restricted stock grants, net	25.9		25.9
Treasury Stock, Shares, Acquired		200,000
Treasury Stock, Value, Acquired, Cost Method	14.8			14.8
Stock Issued During Period, Value, New Issues	$ 279		279
Stock Issued During Period, Shares, New Issues	700,000	3,000,000
Dividends, Common Stock, Cash	$ (87.6)					(87.6)
Other comprehensive (loss) income, net	(49.7)				(49.7)
Ending balance, shares at Sep. 30, 2021		104,200,000					12,000,000
Ending Balance at Sep. 30, 2021	4,514	$ 0	1,695.8	85.9	42.6	2,567	$ 294.5
Beginning balance, shares at Jun. 30, 2021		104,200,000
Beginning balance at Jun. 30, 2021	4,034.5	$ 0	1,687.6	84.2	64.5	2,366.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	236.9					236.9
Restricted stock grants, net, shares		0
Restricted stock grants, net	8.2		8.2
Treasury Stock, Shares, Acquired		0
Treasury Stock, Value, Acquired, Cost Method	1.7			1.7
Dividends, Common Stock, Cash	(36.5)					(36.5)
Other comprehensive (loss) income, net	(21.9)				(21.9)
Ending balance, shares at Sep. 30, 2021		104,200,000					12,000,000
Ending Balance at Sep. 30, 2021	4,514	$ 0	1,695.8	85.9	42.6	2,567	$ 294.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Retained earnings	2,773
Beginning balance, shares at Dec. 31, 2021		106,600,000					12,000,000
Beginning balance at Dec. 31, 2021	4,962.6	$ 0	1,966.2	86.8	15.7	2,773	$ 294.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	764.3					764.3
Restricted stock grants, net, shares		(600,000)
Restricted stock grants, net	30.3		30.3
Treasury Stock, Shares, Acquired		200,000
Treasury Stock, Value, Acquired, Cost Method	18.4			18.4
Stock Issued During Period, Value, New Issues	$ 157.7		157.7
Stock Issued During Period, Shares, New Issues	1,900,000	1,900,000
Dividends, Common Stock, Cash	$ (114.2)					(114.2)
Other comprehensive (loss) income, net	(751.9)				(751.9)
Ending balance, shares at Sep. 30, 2022		108,900,000					12,000,000
Ending Balance at Sep. 30, 2022	5,020.8	$ 0	2,154.2	105.2	(736.2)	3,413.5	$ 294.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends, Preferred Stock, Cash	(9.6)					(9.6)
Beginning balance, shares at Jun. 30, 2022		108,300,000					12,000,000
Beginning balance at Jun. 30, 2022	4,958.8	$ 0	2,094.8	104.3	(517.9)	3,191.7	$ 294.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	264					264
Restricted stock grants, net, shares		0
Restricted stock grants, net	9.4		9.4
Treasury Stock, Shares, Acquired		0
Treasury Stock, Value, Acquired, Cost Method	0.9			0.9
Stock Issued During Period, Value, New Issues	$ 50		50
Stock Issued During Period, Shares, New Issues	600,000	600,000
Dividends, Common Stock, Cash	$ (39)					(39)
Other comprehensive (loss) income, net	(218.3)				(218.3)
Ending balance, shares at Sep. 30, 2022		108,900,000					12,000,000
Ending Balance at Sep. 30, 2022	5,020.8	$ 0	$ 2,154.2	$ 105.2	$ (736.2)	3,413.5	$ 294.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends, Preferred Stock, Cash	(3.2)					$ (3.2)
Retained earnings	$ 3,413

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities:
Net income	$ 764,300	$ 653,200
Adjustments to reconcile net income to cash provided by (used in) operating activities:
Provision for (recovery of) credit losses	(65,000)	(34,600)
Depreciation and amortization	36,100	25,600
Stock-based compensation	30,300	25,600
Deferred income taxes	47,700	43,600
Amortization of net premiums for investment securities	17,100	30,800
Amortization of tax credit investments	45,600	36,600
Amortization of operating lease right of use asset	16,400	11,500
Amortization of net deferred loan fees and net purchase premiums	(50,600)	(53,200)
Payments for Origination and Purchases of Loans Held-for-sale	37,064,400	41,336,400
Proceeds from Sale and Collection of Loans Held-for-sale	38,294,500	37,810,500
Servicing Asset at Fair Value, Additions	578,100	512,700
Servicing Asset at Fair Value, Period Increase (Decrease)	139,300	(49,500)
Net (gains) losses on:
Equity Securities, FV-NI, Unrealized Gain (Loss)	19,400	500
Changes in other assets and liabilities, net	(43,800)	(21,400)
Net cash provided by (used in) operating activities	1,450,900	3,269,000
Payments to Acquire Debt Securities, Available-for-sale	2,286,400	3,100,700
Investment securities - AFS
Principal pay downs and maturities	511,800	1,293,200
Proceeds from sales	124,600	49,800
Debt Securities, Held-to-maturity [Abstract]
Purchases	230,300	494,700
Principal pay downs and maturities	68,100	14,200
Equity Securities, FV-NI, Gain (Loss) [Abstract]
Purchases	(35,200)	(36,100)
Redemptions	1,100	21,400
Proceeds from Sale of Mortgage Servicing Rights (MSR)	382,200	1,112,100
Net increase in loans HFI	(11,736,500)	(8,385,400)
Purchase of premises, equipment, and other assets, net	(84,200)	(31,800)
Net cash used in investing activities	(13,621,000)	10,668,000
Cash flows from financing activities:
Net increase in deposits	7,976,700	13,352,100
Net proceeds from issuance of long-term debt	485,500	831,400
Repayments of Subordinated Debt	(24,800)	(75,000)
Net increase (decrease) in short-term borrowings	4,810,300	(2,396,600)
Cash paid for tax withholding on vested restricted stock and other	18,400	14,600
Cash dividends paid on common stock and preferred stock	123,800	87,600
Proceeds from Issuance of Common Stock	157,700	279,000
Net cash provided by financing activities	13,263,200	12,183,200
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	1,093,100	(1,753,800)
Cash, cash equivalents, and restricted cash at beginning of period	516,400	2,671,700
Cash, cash equivalents, and restricted cash at end of period	1,609,500	917,900
Interest Paid, Excluding Capitalized Interest, Operating Activities	211,400	70,400
Cash paid during the period for:
Income Taxes Paid, Net	190,700	160,200
Transfer of EBO loans previously classified as HFS to HFI	1,505,700	0
Transfers of mortgage-backed securities in settlement of secured borrowings	452,900	495,200
Proceeds from Sale of Equity securities, FV-NI	$ 14,100	$ 2,800
Dividends declared per common share	$ 1.06	$ 0.85
Payments to Acquire Businesses, Net of Cash Acquired	$ 50,000	$ 1,013,400
Other Operating Activities, Cash Flow Statement	10,100	2,400
Purchase of Other Investments	(300,300)	(99,400)
Net increase (decrease) in unfunded commitments and obligations	281,100	152,600
Net increase in unsettled loans HFI and investment securities purchased	(33,400)	104,300
Transfers of securitized LHFS to AFS securities	131,000	0
Preferred Stock [Member]
Cash flows from financing activities:
Stock Issued During Period, Value, New Issues	$ 0	$ 294,500

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 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 24/7 funds transfer and other 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, 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 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 September 30, 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 and nine months ended September 30, 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 non-interest income. Equity securities are carried at their estimated fair value, with changes in fair value required to be reported in earnings as non-interest income. Interest income is recognized based on the coupon rate and, for HTM and AFS securities, 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 through 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. Charge-offs are made through reversal of the allowance for credit losses and a direct charge to the amortized cost basis of the AFS security. The Company considers the following events to be indicators that a charge-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 regularly carrying loans HFS in connection with the AmeriHome acquisition and continues to purchase and originate loans to be sold or securitized through 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, and which are classified as HFS, 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 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 through 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 a rate between the debenture and note rates, as adjusted for probability of default for FHA loans and at the note rate for VA and USDA loans. If management determines that it no longer intends to sell loans classified as HFS, such loans will be transferred to loans HFI. Loans transferred from HFS to HFI are transferred at amortized cost, and any valuation allowance previously recorded is reversed through the Consolidated Income Statement at the time of the transfer. The loans are then evaluated to determine the allowance for credit losses in accordance with the Company's policy as described in the Allowance for credit losses on HFI loans section within this note. Loans held for investment Loans HFI are 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 charge-offs. In addition, the amortized cost basis 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, 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. At the purchase or acquisition date, the amortized cost basis of PCD loans is equal to the purchase price and an initial estimate of credit losses. The initial recognition of expected credit losses on PCD loans has no impact on net income. When the initial measurement of expected credit losses on PCD loans is 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 and are therefore not deemed PCD, 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 a loan becomes 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 government guaranteed or insured loans that are 90 days delinquent, the Company continues to recognize interest income at a rate between the debenture rate and note rates, as adjusted for probability of default for FHA loans, and at the note rate for VA and USDA loans. For all HFI loans, 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 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. Reference Rate Reform On March 5, 2021, the United Kingdom administrator of LIBOR announced that the 1-month, 3-month, 6-month and 12-month US dollar LIBOR settings would cease to exist after June 30, 2023. The US federal banking agencies issued a statement in November 2020 encouraging banks to transition away from US dollar LIBOR as soon as practicable and to stop entering into new contracts that use US dollar LIBOR by December 31, 2021. The Bank began offering three alternative rate indices (Ameribor, SOFR, and BSBY) on its loans in the second half of 2021, with Ameribor as its preferred rate index. The Bank ceased offering loans indexed to US dollar LIBOR on December 31, 2021. Loans indexed to US dollar LIBOR will be converted to Ameribor, SOFR, or BSBY. The Company applied the optional expedient in Topic 848 for such conversions by prospectively adjusting the effective interest rate. For the Company's borrowing arrangements currently indexed to LIBOR, the paying agent is responsible for choosing the alternate rate index. 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 a

Investment Securities

Investment Securities	9 Months Ended
	Sep. 30, 2022
Investments, Debt and Equity Securities [Abstract]
Investment Securities	d fair values of investment securities at September 30, 2022 and December 31, 2021 are summarized as follows: September 30, 2022 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (in millions) Held-to-maturity Private label residential MBS $ 201 $ — $ (44) $ 157 Tax-exempt 1,069 — (142) 927 Total HTM securities $ 1,270 $ — $ (186) $ 1,084 Available-for-sale debt securities CLO $ 2,786 $ — $ (145) $ 2,641 Commercial MBS issued by GSEs 70 — (8) 62 Corporate debt securities 429 — (38) 391 Private label residential MBS 1,473 — (245) 1,228 Residential MBS issued by GSEs 2,085 — (391) 1,694 Tax-exempt 1,026 — (152) 874 Other 75 7 (12) 70 Total AFS debt securities $ 7,944 $ 7 $ (991) $ 6,960 Equity securities CRA investments $ 53 $ — $ (4) $ 49 Preferred stock 124 — (8) 116 Total equity securities $ 177 $ — $ (12) $ 165 December 31, 2021 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (in millions) Held-to-maturity Private label residential MBS $ 217 $ — $ (2) $ 215 Tax-exempt 890 43 (2) 931 Total HTM securities $ 1,107 $ 43 $ (4) $ 1,146 Available-for-sale debt securities CLO $ 926 $ 1 $ (1) $ 926 Commercial MBS issued by GSEs 68 1 — 69 Corporate debt securities 383 9 (9) 383 Private label residential MBS 1,529 3 (24) 1,508 Residential MBS issued by GSEs 2,028 7 (42) 1,993 Tax-exempt 1,145 71 (1) 1,215 U.S. treasury securities 13 — — 13 Other 75 11 (4) 82 Total AFS debt securities $ 6,167 $ 103 $ (81) $ 6,189 Equity securities CRA investments $ 45 $ — $ — $ 45 Preferred stock 107 8 (1) 114 Total equity securities $ 152 $ 8 $ (1) $ 159 Securities with carrying amounts of approximately $ 1.7 billion 2.2 billion The following tables summarize the Company's AFS debt securities in an unrealized loss position at September 30, 2022 and December 31, 2021, aggregated by major security type and length of time in a continuous unrealized loss position: September 30, 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 $ 138 $ 2,460 $ 7 $ 123 $ 145 $ 2,583 Commercial MBS issued by GSEs 4 48 4 14 8 62 Corporate debt securities 32 295 6 94 38 389 Private label residential MBS 135 796 110 424 245 1,220 Residential MBS issued by GSEs 164 946 227 746 391 1,692 Tax-exempt 125 758 27 73 152 831 Other 5 27 7 25 12 52 Total AFS securities $ 603 $ 5,330 $ 388 $ 1,499 $ 991 $ 6,829 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 $ 1 $ 171 $ — $ — $ 1 $ 171 Commercial MBS issued by GSEs 1 19 — — 1 19 Corporate debt securities 9 107 — — 9 107 Private label residential MBS 24 1,250 — — 24 1,250 Residential MBS issued by GSEs 32 1,356 9 142 41 1,498 Tax-exempt 1 141 — — 1 141 Other — 2 4 28 4 30 Total AFS securities $ 68 $ 3,046 $ 13 $ 170 $ 81 $ 3,216 The total number of AFS debt securities in an unrealized loss position at September 30, 2022 is 766, 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 are investment grade, issuers continue to make timely principal and interest payments, and the unrealized losses on these security portfolios primarily relate to changes in interest rates and other market conditions 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 and nine months ended September 30, 2022 and 2021. In addition, as of September 30, 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 September 30, 2022 Balance, Provision for Credit Losses Charge-offs Recoveries Balance, (in millions) Held-to-maturity debt securities Tax-exempt $ 3.2 $ 1.2 $ — $ — $ 4.4 Nine Months Ended September 30, 2022 Balance, Recovery of Credit Losses Charge-offs Recoveries Balance, (in millions) Held-to-maturity debt securities Tax-exempt $ 5.2 $ (0.8) $ — $ — $ 4.4 Three Months Ended September 30, 2021: Balance, Recovery of Credit Losses Charge-offs Recoveries Balance (in millions) Held-to-maturity debt securities Tax-exempt $ 6.0 $ (1.5) $ — $ — $ 4.5 Nine Months Ended September 30, 2021: Balance, Recovery of Credit Losses Charge-offs Recoveries Balance (in millions) Held-to-maturity debt securities Tax-exempt $ 6.8 $ (2.3) $ — $ — $ 4.5 No allowance has been recognized on the Company's HTM private label residential MBS as losses are not expected due to the Company holding a senior position in these securities. Accrued interest receivable on HTM securities totaled $4 million and $3 million at September 30, 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 September 30, 2022 and December 31, 2021, which are updated quarterly and used to monitor the credit quality of the Company's securities: September 30, 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 $ — $ — $ — $ — $ — $ — $ 201 $ 201 Tax-exempt — — — — — — 1,069 1,069 Total HTM securities (1) $ — $ — $ — $ — $ — $ — $ 1,270 $ 1,270 Available-for-sale debt securities CLO $ 277 $ — $ 2,096 $ 268 $ — $ — $ — $ 2,641 Commercial MBS issued by GSEs — 62 — — — — — 62 Corporate debt securities — — — 75 316 — — 391 Private label residential MBS 1,136 — 91 — 1 — — 1,228 Residential MBS issued by GSEs — 1,694 — — — — — 1,694 Tax-exempt 15 15 392 417 — — 35 874 Other — — 9 9 27 7 18 70 Total AFS securities (1) $ 1,428 $ 1,771 $ 2,588 $ 769 $ 344 $ 7 $ 53 $ 6,960 Equity securities CRA investments $ — $ 24 $ — $ — $ — $ — $ 25 $ 49 Preferred stock — — — — 89 17 10 116 Total equity securities (1) $ — $ 24 $ — $ — $ 89 $ 17 $ 35 $ 165 (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 $ — $ — $ — $ — $ — $ — $ 217 $ 217 Tax-exempt — — — — — — 890 890 Total HTM securities (1) $ — $ — $ — $ — $ — $ — $ 1,107 $ 1,107 Available-for-sale debt securities CLO $ 45 $ — $ 636 $ 245 $ — $ — $ — $ 926 Commercial MBS issued by GSEs — 69 — — — — — 69 Corporate debt securities — — — 45 319 19 — 383 Private label residential MBS 1,420 — 87 — 1 — — 1,508 Residential MBS issued by GSEs — 1,993 — — — — — 1,993 Tax-exempt 43 40 469 629 — — 34 1,215 U.S. treasury securities — 13 — — — — — 13 Other — — 12 10 30 10 20 82 Total AFS securities (1) $ 1,508 $ 2,115 $ 1,204 $ 929 $ 350 $ 29 $ 54 $ 6,189 Equity securities CRA investments $ — $ 28 $ — $ — $ — $ — $ 17 $ 45 Preferred stock — — — — 79 20 15 114 Total equity securities (1) $ — $ 28 $ — $ — $ 79 $ 20 $ 32 $ 159 (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 September 30, 2022, the Company did not have a significant amount of investment securities that were past due or on nonaccrual status. The amortized cost and fair value of the Company's debt securities as of September 30, 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. September 30, 2022 Amortized Cost Estimated Fair Value (in millions) Held-to-maturity Due in one year or less $ 3 $ 3 After one year through five years 23 22 After five years through ten years 29 28 After ten years 1,013 874 Mortgage-backed securities 201 157 Total HTM securities $ 1,270 $ 1,084 Available-for-sale Due in one year or less $ 1 $ 1 After one year through five years 172 159 After five years through ten years 1,147 1,083 After ten years 2,997 2,733 Mortgage-backed securities 3,627 2,984 Total AFS securities $ 7,944 $ 6,960

Stockholders' Equity

Stockholders' Equity	9 Months Ended
	Sep. 30, 2022
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 were 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 and nine months ended September 30, 2022 was $0.8 million and $42.2 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 and nine months ended September 30, 2022, the Company recognized $7.1 million and $21.8 million, respectively, in stock-based compensation expense related to these stock grants, compared to $5.0 million and $17.2 million for the three and nine months ended September 30, 2021, respectively. 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 and nine months ended September 30, 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 $0.6 million in stock-based compensation expense related to these performance-based restricted stock grants during the nine months ended September 30, 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 and nine months ended September 30, 2022, the Company recognized $2.3 million and $8.5 million, respectively, in stock-based compensation expense related to these performance stock units, compared to $3.1 million and $7.7 million in stock-based compensation expense for such units during the three and nine months ended September 30, 2021, respectively. 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). During the three and nine months ended September 30, 2022, the Company declared and paid a quarterly cash dividend of $0.27 per depositary share, for a total dividend payment to preferred shareholders of $3.2 million and $9.6 million, respectively. The Company did not pay a dividend to preferred shareholders during the three and nine months ended September 30, 2021. 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 and nine months ended September 30, 2022, the Company sold 0.6 million and 1.9 million shares, respectively, under the ATM program at a weighted-average selling price of $78.27 and $83.89 per share for gross proceeds of $50.3 million and $158.7 million, respectively. There were no sales under the ATM program during the three months ended September 30, 2021. During the nine months ended September 30, 2021, the Company sold 0.7 million shares under the ATM program at a weighted-average selling price of $100.59 per share for gross proceeds of $70.4 million. Total related offering costs were $0.3 million and $1.0 million, respectively, for the three and nine months ended September 30, 2022, substantially all of which relates to compensation costs paid to the distribution agents, and $0.6 million for the nine months ended September 30, 2021, of which $0.4 million relates to compensation costs paid to the distribution agent. As of September 30, 2022, the remaining number of shares that can be sold under this agreement totaled 1,107,769. Registered Direct Offering The Company sold 2.3 million shares of its common stock in a registered direct offering during the nine months ended September 30, 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 and nine months ended September 30, 2022, the Company declared and paid a quarterly cash dividend of $0.35 per share for the first two quarters of the year and increased the quarterly cash dividend to $0.36 per share in the third quarter, for a total dividend payment to shareholders of $39.0 million and $114.2 million, respectively. During the three and nine months ended September 30, 2021, the Company declared and paid quarterly cash dividends of $0.25 per share for the first two quarters of the year and increased the quarterly cash dividend to $0.35 per share in the third quarter, for a total dividend payment to shareholders of $36.5 million and $87.6 million, respectively. Treasury Shares

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	9 Months Ended
	Sep. 30, 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 September 30, Unrealized holding gains (losses) on AFS securities Unrealized holding losses on SERP Unrealized holding gains (losses) on junior subordinated debt Total (in millions) Balance, June 30, 2022 $ (521.1) $ (0.3) $ 3.5 $ (517.9) Other comprehensive (loss) income before reclassifications (219.9) — 1.6 (218.3) Amounts reclassified from AOCI — — — — Net current-period other comprehensive (loss) income (219.9) — 1.6 (218.3) Balance, September 30, 2022 $ (741.0) $ (0.3) $ 5.1 $ (736.2) Balance, June 30, 2021 $ 64.8 $ (0.3) $ — $ 64.5 Other comprehensive loss before reclassifications (21.8) — (0.1) (21.9) Amounts reclassified from AOCI — — — — Net current-period other comprehensive loss (21.8) — (0.1) (21.9) Balance, September 30, 2021 $ 43.0 $ (0.3) $ (0.1) $ 42.6 Nine Months Ended September 30, Unrealized holding gains (losses) on AFS securities Unrealized holding 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 (752.3) — 5.8 (746.5) Amounts reclassified from AOCI (5.4) — — (5.4) Net current-period other comprehensive (loss) income (757.7) — 5.8 (751.9) Balance, September 30, 2022 $ (741.0) $ (0.3) $ 5.1 $ (736.2) Balance, December 31, 2020 $ 92.1 $ (0.3) $ 0.5 $ 92.3 Other comprehensive loss before reclassifications (49.0) — (0.6) (49.6) Amounts reclassified from AOCI (0.1) — — (0.1) Net current-period other comprehensive loss (49.1) — (0.6) (49.7) Balance, September 30, 2021 $ 43.0 $ (0.3) $ (0.1) $ 42.6

Derivatives and Hedging

Derivatives and Hedging	3 Months Ended
	Sep. 30, 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. 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 plus a spread adjustment 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 was identified as the hedged item. Under these interest rate swap contracts, the Company received a variable rate and paid a fixed rate on the outstanding notional amount. 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 million. During the nine months ended September 30, 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 $31 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 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 September 30, 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: September 30, 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) $ 447 $ 22 $ 1,391 $ 39 (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 $16 million and the basis adjustment related to the discontinued portion was $1 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 September 30, 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 $ 27.5 $ (27.5) $ 7.5 $ (7.4) Interest expense — — (0.5) 0.5 Nine Months Ended September 30, 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 $ 76.3 $ (76.2) $ 35.4 $ (35.3) Interest expense — — (2.4) 2.4 In addition to the gains and losses on the Company's outstanding fair value hedges presented in the above table, the Company recognized $3.0 million and $7.0 million in interest income related to the amortization of the cumulative basis adjustment on its discontinued last-of-layer hedges during the three and nine months ended September 30, 2022, respectively. 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 September 30, 2022, December 31, 2021, and September 30, 2021. The change in the notional amounts of these derivatives from September 30, 2021 to September 30, 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. September 30, 2022 December 31, 2021 September 30, 2021 Fair Value Fair Value Fair Value Notional Derivative Assets Derivative Liabilities Notional Derivative Assets Derivative Liabilities Notional Derivative Assets Derivative Liabilities (in millions) Derivatives designated as hedging instruments: Fair value hedges Interest rate swaps (1) $ 483 $ 22 $ — $ 1,383 $ 14 $ 55 $ 1,547 $ 7 $ 57 Total 483 22 — 1,383 14 55 1,547 7 57 Derivatives not designated as hedging instruments (2): Foreign currency contracts $ 146 $ 2 $ 1 $ 180 $ — $ 1 $ 118 $ 2 $ — Forward purchase contracts 8,226 3 249 11,714 8 18 6,551 1 37 Forward sales contracts 11,792 380 6 17,358 16 18 13,984 71 4 Futures purchase contracts (3) 172,333 — — 218,054 — — 224,325 — — Futures sales contracts (3) 180,454 — — 229,040 — — 232,527 — — Interest rate lock commitments 1,918 3 31 3,033 11 2 3,576 15 6 Interest rate swaps 2,155 5 5 4 — — 4 — — Options contracts — — — — — — 50 — — Total $ 377,024 $ 393 $ 292 $ 479,383 $ 35 $ 39 $ 481,135 $ 89 $ 47 Margin (100) (11) 1 6 1 37 Total, including margin $ 377,024 $ 293 $ 281 $ 479,383 $ 36 $ 45 $ 481,135 $ 90 $ 84 (1) Interest rate swap amounts include a notional amount of $880 million related to the last-of-layer hedges at December 31, 2021 and September 30, 2021. (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: September 30, 2022 December 31, 2021 September 30, 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 $ — $ 3 $ 8 $ — $ 8 $ 1 $ — $ 1 Forward sales contracts 360 — 360 15 — 15 69 — 69 Interest rate swaps 22 — 22 14 — 14 7 — 7 Margin (100) — (100) 1 — 1 1 — 1 Netting — (233) (233) — (28) (28) — (66) (66) $ 285 $ (233) $ 52 $ 38 $ (28) $ 10 $ 78 $ (66) $ 12 Liabilities Forward purchase contracts $ (242) $ — $ (242) $ (18) $ — $ (18) $ (37) $ — $ (37) Forward sales contracts (6) — (6) (18) — (18) (4) — (4) Interest rate swaps — — — (54) — (54) (57) — (57) Margin 11 — 11 (6) — (6) (37) — (37) Netting — 233 233 — 28 28 — 66 66 $ (237) $ 233 $ (4) $ (96) $ 28 $ (68) $ (135) $ 66 $ (69) Derivatives not subject to master netting arrangements: Assets Foreign currency contracts $ 2 $ — $ 2 $ — $ — $ — $ 2 $ — $ 2 Forward sales contracts 20 — 20 1 — 1 2 — 2 Interest rate lock commitments 3 — 3 11 — 11 15 — 15 Interest rate swaps 5 — 5 — — — — — — $ 30 $ — $ 30 $ 12 $ — $ 12 $ 19 $ — $ 19 Liabilities Foreign currency contracts $ (1) $ — $ (1) $ (2) $ — $ (2) $ — $ — $ — Forward purchase contracts (7) — (7) — — — — — — Interest rate lock commitments (31) — (31) (2) — (2) (6) — (6) Interest rate swaps (5) — (5) — — — — — — $ (44) $ — $ (44) $ (4) $ — $ (4) $ (6) $ — $ (6) Total derivatives and margin Assets $ 315 $ (233) $ 82 $ 50 $ (28) $ 22 $ 97 $ (66) $ 31 Liabilities $ (281) $ 233 $ (48) $ (100) $ 28 $ (72) $ (141) $ 66 $ (75) The following table summarizes the net gain (loss) on derivatives included in income: Three Months Ended September 30, Nine Months Ended September 30, 2022 2021 2022 2021 ($ in millions) Net gain (loss) on loan origination and sale activities: Interest rate lock commitments $ (39.3) $ (26.6) $ (36.9) $ (7.0) Forward contracts 145.3 17.1 487.6 (50.6) Interest rate swaps (8.6) — (8.6) — Other contracts 1.6 (2.4) (8.2) (0.1) Total gain (loss) $ 99.0 $ (11.9) $ 433.9 $ (57.7) Net loan servicing revenue: Forward contracts $ (18.0) $ (2.6) $ (60.9) $ 10.1 Options contracts — 1.4 — 0.4 Futures contracts 2.4 (8.9) (41.5) 15.7 Interest rate swaps (52.8) — (52.8) — Total loss $ (68.4) $ (10.1) $ (155.2) $ 26.2 Counterparty Credit Risk

Earnings per Share

Earnings per Share	9 Months Ended
	Sep. 30, 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 September 30, Nine Months Ended September 30, 2022 2021 2022 2021 (in millions, except per share amounts) Weighted average shares - basic 107.5 103.3 107.0 102.3 Dilutive effect of stock awards 0.4 0.6 0.4 0.6 Weighted average shares - diluted 107.9 103.9 107.4 102.9 Net income available to common stockholders $ 260.8 $ 236.9 $ 754.7 $ 653.2 Earnings per share - basic 2.43 2.29 7.06 6.39 Earnings per share - diluted 2.42 2.28 7.03 6.35 The Company had no anti-dilutive stock options outstanding as of September 30, 2022 and 2021.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Income Taxes	The Company's effective tax rate was 19.9% and 21.7% for the three months ended September 30, 2022 and 2021, respectively. For the nine months ended September 30, 2022 and 2021, the Company's effective tax rate was 19.7%. The decrease in the three month effective tax rate was primarily due to increases in solar tax credit investments and a decrease in state tax expense. As of September 30, 2022, the net DTA balance totaled $302 million, an increase of $281 million from $21 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 and expected tax credit carryovers. These items 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 $302 million at September 30, 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 September 30, 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.

Segments

Segments	9 Months Ended
	Sep. 30, 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 and beginning on January 25, 2022 includes the financial results of DST. • 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 in net interest income. The net income amount for each reportable segment is further derived by the use of expense allocations. Certain expenses not directly attributable to a specific segment are allocated across all segments based on key metrics, such as number of employees, number of transactions processed for loans and deposits, and average loan and deposit balances. These types of expenses include information technology, operations, human resources, finance, risk management, credit administration, legal, and marketing. Income taxes are applied to each segment based on 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.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 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 24/7 funds transfer and other blockchain-based offerings through its wholly-owned banking subsidiary, WAB.
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, 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)
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 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 September 30, 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	ReclassificationsCertain 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 non-interest income. Equity securities are carried at their estimated fair value, with changes in fair value required to be reported in earnings as non-interest income. Interest income is recognized based on the coupon rate and, for HTM and AFS securities, 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.
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. Charge-offs are made through reversal of the allowance for credit losses and a direct charge to the amortized cost basis of the AFS security. The Company considers the following events to be indicators that a charge-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. 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 HFI are 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 charge-offs. In addition, the amortized cost basis 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, 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. At the purchase or acquisition date, the amortized cost basis of PCD loans is equal to the purchase price and an initial estimate of credit losses. The initial recognition of expected credit losses on PCD loans has no impact on net income. When the initial measurement of expected credit losses on PCD loans is 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 and are therefore not deemed PCD, 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 a loan becomes 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 government guaranteed or insured loans that are 90 days delinquent, the Company continues to recognize interest income at a rate between the debenture rate and note rates, as adjusted for probability of default for FHA loans, and at the note rate for VA and USDA loans. For all HFI loans, 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 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. Reference Rate Reform On March 5, 2021, the United Kingdom administrator of LIBOR announced that the 1-month, 3-month, 6-month and 12-month US dollar LIBOR settings would cease to exist after June 30, 2023. The US federal banking agencies issued a statement in November 2020 encouraging banks to transition away from US dollar LIBOR as soon as practicable and to stop entering into new contracts that use US dollar LIBOR by December 31, 2021. The Bank began offering three alternative rate indices (Ameribor, SOFR, and BSBY) on its loans in the second half of 2021, with Ameribor as its preferred rate index. The Bank ceased offering loans indexed to US dollar LIBOR on December 31, 2021. Loans indexed to US dollar LIBOR will be converted to Ameribor, SOFR, or BSBY. The Company applied the optional expedient in Topic 848 for such conversions by prospectively adjusting the effective interest rate. For the Company's borrowing arrangements currently indexed to LIBOR, the paying agent is responsible for choosing the alternate rate index. 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 HFI loans. 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. The estimate of expected credit losses excludes accrued interest receivable on these loans, except for accrued interest related to the Residential-EBO loan pool. Accrued interest receivable, net of an allowance for credit losses on the Residential-EBO loan pool, is included in Other assets on the Consolidated Balance Sheet. The allowance for credit losses on HFI loans includes an estimate of future charge-offs, offset by expected recoveries of amounts previously charged-off and shall not exceed the aggregate of prior and expected charge-offs. 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 effects 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 growth, 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, and assessment of borrower guarantees. 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, loans are segregated into loan segments with shared risk characteristics. 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 other risk characteristics. 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 define default as 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 consideration of different probability weighted economic scenarios, 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 or contributions from ownership to sustain the business's growth model. Expected credit losses for this loan segment are estimated using internally-developed models. 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 average investment to GDP and treasury yields. 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 primarily of commercial and industrial loans to middle market companies and large corporations that are not collateralized by real estate. The models used to estimate expected credit losses for middle market companies are the same as those used for the tech & innovation portfolio segment, whereas a vendor model is used to estimate expected credit losses for loans to large corporations. 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. Residential - EBO The residential EBO loan portfolio segment is comprised of government guaranteed or insured loans collateralized primarily by first liens on 1-4 residential family properties purchased from the FHA, VA, or USDA, which were at least three months delinquent at the time of purchase. These loans differ from the residential loans included in the Company's Residential loan portfolio segment as the principal balance of these loans are government guaranteed or insured. The Company has not recognized an allowance for credit losses on this portfolio segment as management's expectation of nonpayment of the amortized cost basis, based on historical losses, adjusted for current and forecasted conditions, is zero. 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
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 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.
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 may 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 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 in 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 and nine months ended September 30, 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 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 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. 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). 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 September 30, 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 September 30, 2022 and December 31, 2021. The estimated fair value amounts for September 30, 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. 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 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
Loans, held for sale	Loans held for sale The Company began regularly carrying loans HFS in connection with the AmeriHome acquisition and continues to purchase and originate loans to be sold or securitized through 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, and which are classified as HFS, 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 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 through 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 a rate between the debenture and note rates, as adjusted for probability of default for FHA loans and at the note rate for VA and USDA loans.
Transfers and Servicing of Financial Assets, Policy	Mortgage servicing rights The Company generates 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 estimated proceeds to be 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.

Investment Securities (Tables)

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2022
Investments, Debt and Equity Securities [Abstract]
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Table Text Block]	Three Months Ended September 30, 2022 Balance, Provision for Credit Losses Charge-offs Recoveries Balance, (in millions) Held-to-maturity debt securities Tax-exempt $ 3.2 $ 1.2 $ — $ — $ 4.4 Nine Months Ended September 30, 2022 Balance, Recovery of Credit Losses Charge-offs Recoveries Balance, (in millions) Held-to-maturity debt securities Tax-exempt $ 5.2 $ (0.8) $ — $ — $ 4.4 Three Months Ended September 30, 2021: Balance, Recovery of Credit Losses Charge-offs Recoveries Balance (in millions) Held-to-maturity debt securities Tax-exempt $ 6.0 $ (1.5) $ — $ — $ 4.5 Nine Months Ended September 30, 2021: Balance, Recovery of Credit Losses Charge-offs Recoveries Balance (in millions) Held-to-maturity debt securities Tax-exempt $ 6.8 $ (2.3) $ — $ — $ 4.5
Carrying Amounts and Fair Values of Investment Securities	The carrying amounts and fair values of investment securities at September 30, 2022 and December 31, 2021 are summarized as follows: September 30, 2022 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (in millions) Held-to-maturity Private label residential MBS $ 201 $ — $ (44) $ 157 Tax-exempt 1,069 — (142) 927 Total HTM securities $ 1,270 $ — $ (186) $ 1,084 Available-for-sale debt securities CLO $ 2,786 $ — $ (145) $ 2,641 Commercial MBS issued by GSEs 70 — (8) 62 Corporate debt securities 429 — (38) 391 Private label residential MBS 1,473 — (245) 1,228 Residential MBS issued by GSEs 2,085 — (391) 1,694 Tax-exempt 1,026 — (152) 874 Other 75 7 (12) 70 Total AFS debt securities $ 7,944 $ 7 $ (991) $ 6,960 Equity securities CRA investments $ 53 $ — $ (4) $ 49 Preferred stock 124 — (8) 116 Total equity securities $ 177 $ — $ (12) $ 165 December 31, 2021 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value (in millions) Held-to-maturity Private label residential MBS $ 217 $ — $ (2) $ 215 Tax-exempt 890 43 (2) 931 Total HTM securities $ 1,107 $ 43 $ (4) $ 1,146 Available-for-sale debt securities CLO $ 926 $ 1 $ (1) $ 926 Commercial MBS issued by GSEs 68 1 — 69 Corporate debt securities 383 9 (9) 383 Private label residential MBS 1,529 3 (24) 1,508 Residential MBS issued by GSEs 2,028 7 (42) 1,993 Tax-exempt 1,145 71 (1) 1,215 U.S. treasury securities 13 — — 13 Other 75 11 (4) 82 Total AFS debt securities $ 6,167 $ 103 $ (81) $ 6,189 Equity securities CRA investments $ 45 $ — $ — $ 45 Preferred stock 107 8 (1) 114 Total equity securities $ 152 $ 8 $ (1) $ 159 Securities with carrying amounts of approximately $ 1.7 billion 2.2 billion
Unrealized Losses and Fair Value of Investment Securities in Continuous Unrealized Loss Position	unrealized loss position at September 30, 2022 and December 31, 2021, aggregated by major security type and length of time in a continuous unrealized loss position: September 30, 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 $ 138 $ 2,460 $ 7 $ 123 $ 145 $ 2,583 Commercial MBS issued by GSEs 4 48 4 14 8 62 Corporate debt securities 32 295 6 94 38 389 Private label residential MBS 135 796 110 424 245 1,220 Residential MBS issued by GSEs 164 946 227 746 391 1,692 Tax-exempt 125 758 27 73 152 831 Other 5 27 7 25 12 52 Total AFS securities $ 603 $ 5,330 $ 388 $ 1,499 $ 991 $ 6,829 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 $ 1 $ 171 $ — $ — $ 1 $ 171 Commercial MBS issued by GSEs 1 19 — — 1 19 Corporate debt securities 9 107 — — 9 107 Private label residential MBS 24 1,250 — — 24 1,250 Residential MBS issued by GSEs 32 1,356 9 142 41 1,498 Tax-exempt 1 141 — — 1 141 Other — 2 4 28 4 30 Total AFS securities $ 68 $ 3,046 $ 13 $ 170 $ 81 $ 3,216
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 September 30, 2022, the Company did not have a significant amount of investment securities that were past due or on nonaccrual status. The amortized cost and fair value of the Company's debt securities as of September 30, 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. September 30, 2022 Amortized Cost Estimated Fair Value (in millions) Held-to-maturity Due in one year or less $ 3 $ 3 After one year through five years 23 22 After five years through ten years 29 28 After ten years 1,013 874 Mortgage-backed securities 201 157 Total HTM securities $ 1,270 $ 1,084 Available-for-sale Due in one year or less $ 1 $ 1 After one year through five years 172 159 After five years through ten years 1,147 1,083 After ten years 2,997 2,733 Mortgage-backed securities 3,627 2,984 Total AFS securities $ 7,944 $ 6,960
Investment Securities by Credit Rating Type	The following tables summarize the carrying amount of the Company’s investment ratings position as of September 30, 2022 and December 31, 2021, which are updated quarterly and used to monitor the credit quality of the Company's securities: September 30, 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 $ — $ — $ — $ — $ — $ — $ 201 $ 201 Tax-exempt — — — — — — 1,069 1,069 Total HTM securities (1) $ — $ — $ — $ — $ — $ — $ 1,270 $ 1,270 Available-for-sale debt securities CLO $ 277 $ — $ 2,096 $ 268 $ — $ — $ — $ 2,641 Commercial MBS issued by GSEs — 62 — — — — — 62 Corporate debt securities — — — 75 316 — — 391 Private label residential MBS 1,136 — 91 — 1 — — 1,228 Residential MBS issued by GSEs — 1,694 — — — — — 1,694 Tax-exempt 15 15 392 417 — — 35 874 Other — — 9 9 27 7 18 70 Total AFS securities (1) $ 1,428 $ 1,771 $ 2,588 $ 769 $ 344 $ 7 $ 53 $ 6,960 Equity securities CRA investments $ — $ 24 $ — $ — $ — $ — $ 25 $ 49 Preferred stock — — — — 89 17 10 116 Total equity securities (1) $ — $ 24 $ — $ — $ 89 $ 17 $ 35 $ 165 (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 $ — $ — $ — $ — $ — $ — $ 217 $ 217 Tax-exempt — — — — — — 890 890 Total HTM securities (1) $ — $ — $ — $ — $ — $ — $ 1,107 $ 1,107 Available-for-sale debt securities CLO $ 45 $ — $ 636 $ 245 $ — $ — $ — $ 926 Commercial MBS issued by GSEs — 69 — — — — — 69 Corporate debt securities — — — 45 319 19 — 383 Private label residential MBS 1,420 — 87 — 1 — — 1,508 Residential MBS issued by GSEs — 1,993 — — — — — 1,993 Tax-exempt 43 40 469 629 — — 34 1,215 U.S. treasury securities — 13 — — — — — 13 Other — — 12 10 30 10 20 82 Total AFS securities (1) $ 1,508 $ 2,115 $ 1,204 $ 929 $ 350 $ 29 $ 54 $ 6,189 Equity securities CRA investments $ — $ 28 $ — $ — $ — $ — $ 17 $ 45 Preferred stock — — — — 79 20 15 114 Total equity securities (1) $ — $ 28 $ — $ — $ 79 $ 20 $ 32 $ 159 (1) For rated securities, if ratings differ, the Company uses an average of the available ratings by major credit agencies.

Loans, Leases and Allowance for

Loans, Leases and Allowance for Credit Losses (Tables)	9 Months Ended
	Sep. 30, 2022
Receivables [Abstract]
Financing Receivable, Troubled Debt Restructuring [Table Text Block]	The following table presents TDR loans: September 30, 2022 December 31, 2021 Number of Loans Recorded Investment Number of Loans Recorded Investment (dollars in millions) Tech & innovation 1 $ 3 2 $ 2 Other commercial and industrial 7 8 7 6 CRE - owner occupied 1 1 1 1 Hotel franchise finance 1 10 — — Other CRE - non-owner occupied 3 8 5 11 Construction and land development 1 1 1 1 Total 14 $ 31 16 $ 21
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: September 30, 2022 December 31, 2021 (in millions) Warehouse lending $ 5,525 $ 5,156 Municipal & nonprofit 1,522 1,579 Tech & innovation 2,175 1,418 Equity fund resources 5,107 3,830 Other commercial and industrial 8,182 6,465 CRE - owner occupied 1,686 1,723 Hotel franchise finance 3,602 2,534 Other CRE - non-owner occupied 5,021 3,952 Residential 13,810 9,243 Residential - EBO 1,815 — Construction and land development 3,579 3,006 Other 177 169 Total loans HFI 52,201 39,075 Allowance for credit losses (304) (252) Total loans HFI, net of allowance $ 51,897 $ 38,823
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: September 30, 2022 Current 30-59 Days 60-89 Days Over 90 days Total Total (in millions) Warehouse lending $ 5,525 $ — $ — $ — $ — $ 5,525 Municipal & nonprofit 1,522 — — — — 1,522 Tech & innovation 2,175 — — — — 2,175 Equity fund resources 5,107 — — — — 5,107 Other commercial and industrial 8,181 1 — — 1 8,182 CRE - owner occupied 1,686 — — — — 1,686 Hotel franchise finance 3,593 — 9 — 9 3,602 Other CRE - non-owner occupied 5,021 — — — — 5,021 Residential 13,764 42 4 — 46 13,810 Residential - EBO 926 166 79 644 889 1,815 Construction and land development 3,579 — — — — 3,579 Other 177 — — — — 177 Total loans $ 51,256 $ 209 $ 92 $ 644 $ 945 $ 52,201 December 31, 2021 Current 30-59 Days 60-89 Days Over 90 days Total Total (in millions) Warehouse lending $ 5,156 $ — $ — $ — $ — $ 5,156 Municipal & nonprofit 1,579 — — — — 1,579 Tech & innovation 1,418 — — — — 1,418 Equity fund resources 3,830 — — — — 3,830 Other commercial and industrial 6,465 — — — — 6,465 CRE - owner occupied 1,723 — — — — 1,723 Hotel franchise finance 2,534 — — — — 2,534 Other CRE - non-owner occupied 3,952 — — — — 3,952 Residential 9,191 51 1 — 52 9,243 Construction and land development 3,006 — — — — 3,006 Other 169 — — — — 169 Total loans $ 39,023 $ 51 $ 1 $ — $ 52 $ 39,075
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: September 30, 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) Municipal & nonprofit $ — $ 7 $ 7 $ — Tech & innovation — 4 4 — Other commercial and industrial 12 6 18 — CRE - owner occupied 9 2 11 — Hotel franchise finance — 10 10 — Other CRE - non-owner occupied 17 2 19 — Residential — 20 20 — Residential - EBO — — — 644 Construction and land development 1 — 1 — Total $ 39 $ 51 $ 90 $ 644 Loans contractually delinquent by 90 days or more and still accruing totaled $644 million at September 30, 2022 and consist entirely of government guaranteed EBO residential loans.
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 September 30, 2022 2022 2021 2020 2019 2018 Prior (in millions) Warehouse lending Pass $ 429 $ 43 $ 140 $ — $ — $ — $ 4,913 $ 5,525 Special mention — — — — — — — — Classified — — — — — — — — Total $ 429 $ 43 $ 140 $ — $ — $ — $ 4,913 $ 5,525 Municipal & nonprofit Pass $ 101 $ 179 $ 189 $ 72 $ 43 $ 925 $ — $ 1,509 Special mention — — — 6 — — — 6 Classified — — — — — 7 — 7 Total $ 101 $ 179 $ 189 $ 78 $ 43 $ 932 $ — $ 1,522 Tech & innovation Pass $ 639 $ 510 $ 86 $ 71 $ 5 $ 1 $ 779 $ 2,091 Special mention 20 17 3 — — — 21 61 Classified 4 8 — 9 — — 2 23 Total $ 663 $ 535 $ 89 $ 80 $ 5 $ 1 $ 802 $ 2,175 Equity fund resources Pass $ 1,617 $ 1,585 $ 214 $ 45 $ — $ — $ 1,646 $ 5,107 Special mention — — — — — — — — Classified — — — — — — — — Total $ 1,617 $ 1,585 $ 214 $ 45 $ — $ — $ 1,646 $ 5,107 Other commercial and industrial Pass $ 2,676 $ 1,817 $ 259 $ 393 $ 339 $ 251 $ 2,353 $ 8,088 Special mention 1 32 20 3 — — 3 59 Classified 5 3 5 6 3 1 12 35 Total $ 2,682 $ 1,852 $ 284 $ 402 $ 342 $ 252 $ 2,368 $ 8,182 CRE - owner occupied Pass $ 322 $ 359 $ 184 $ 168 $ 214 $ 359 $ 32 $ 1,638 Special mention — 2 — — — 1 11 14 Classified 8 10 1 — 5 10 — 34 Total $ 330 $ 371 $ 185 $ 168 $ 219 $ 370 $ 43 $ 1,686 Hotel franchise finance Pass $ 1,386 $ 727 $ 54 $ 559 $ 321 $ 164 $ 118 $ 3,329 Special mention — — 26 51 — — — 77 Classified 18 20 — 113 45 — — 196 Total $ 1,404 $ 747 $ 80 $ 723 $ 366 $ 164 $ 118 $ 3,602 Other CRE - non-owner occupied Pass $ 1,950 $ 1,187 $ 874 $ 268 $ 166 $ 233 $ 259 $ 4,937 Special mention 6 27 — 19 — — — 52 Classified — — — 3 10 19 — 32 Total $ 1,956 $ 1,214 $ 874 $ 290 $ 176 $ 252 $ 259 $ 5,021 Term Loan Amortized Cost Basis by Origination Year Revolving Loans Amortized Cost Basis Total September 30, 2022 2022 2021 2020 2019 2018 Prior (in millions) Residential Pass $ 3,714 $ 8,581 $ 891 $ 318 $ 156 $ 91 $ 39 $ 13,790 Special mention — — — — — — — — Classified 1 13 — 3 1 2 — 20 Total $ 3,715 $ 8,594 $ 891 $ 321 $ 157 $ 93 $ 39 $ 13,810 Residential - EBO Pass $ — $ 262 $ 719 $ 428 $ 167 $ 239 $ — $ 1,815 Special mention — — — — — — — — Classified — — — — — — — — Total $ — $ 262 $ 719 $ 428 $ 167 $ 239 $ — $ 1,815 Construction and land development Pass $ 1,034 $ 978 $ 385 $ 28 $ — $ 2 $ 1,099 $ 3,526 Special mention — 2 41 — — — — 43 Classified — 1 8 1 — — — 10 Total $ 1,034 $ 981 $ 434 $ 29 $ — $ 2 $ 1,099 $ 3,579 Other Pass $ 18 $ 12 $ 13 $ 6 $ 3 $ 62 $ 63 $ 177 Special mention — — — — — — — — Classified — — — — — — — — Total $ 18 $ 12 $ 13 $ 6 $ 3 $ 62 $ 63 $ 177 Total by Risk Category Pass $ 13,886 $ 16,240 $ 4,008 $ 2,356 $ 1,414 $ 2,327 $ 11,301 $ 51,532 Special mention 27 80 90 79 — 1 35 312 Classified 36 55 14 135 64 39 14 357 Total $ 13,949 $ 16,375 $ 4,112 $ 2,570 $ 1,478 $ 2,367 $ 11,350 $ 52,201 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 $ 243 $ 12 $ — $ — $ — $ — $ 4,901 $ 5,156 Special mention — — — — — — — — Classified — — — — — — — — Total $ 243 $ 12 $ — $ — $ — $ — $ 4,901 $ 5,156 Municipal & nonprofit Pass $ 129 $ 195 $ 101 $ 53 $ 219 $ 878 $ 4 $ 1,579 Special mention — — — — — — — — Classified — — — — — — — — Total $ 129 $ 195 $ 101 $ 53 $ 219 $ 878 $ 4 $ 1,579 Tech & innovation Pass $ 763 $ 157 $ 101 $ 6 $ — $ 1 $ 334 $ 1,362 Special mention 26 5 — — — — 8 39 Classified 3 5 7 — — — 2 17 Total $ 792 $ 167 $ 108 $ 6 $ — $ 1 $ 344 $ 1,418 Equity fund resources Pass $ 9 $ 2 $ — $ — $ 2 $ — $ 3,817 $ 3,830 Special mention — — — — — — — — Classified — — — — — — — — Total $ 9 $ 2 $ — $ — $ 2 $ — $ 3,817 $ 3,830 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) Other commercial and industrial Pass $ 2,911 $ 360 $ 387 $ 210 $ 80 $ 98 $ 2,306 $ 6,352 Special mention 5 27 22 18 — — 15 87 Classified — 10 6 2 1 — 7 26 Total $ 2,916 $ 397 $ 415 $ 230 $ 81 $ 98 $ 2,328 $ 6,465 CRE - owner occupied Pass $ 417 $ 199 $ 220 $ 190 $ 278 $ 322 $ 56 $ 1,682 Special mention — — — 10 — 2 — 12 Classified 2 2 1 5 8 11 — 29 Total $ 419 $ 201 $ 221 $ 205 $ 286 $ 335 $ 56 $ 1,723 Hotel franchise finance Pass $ 721 $ 205 $ 659 $ 332 $ 135 $ 64 $ 123 $ 2,239 Special mention — — 88 51 — — — 139 Classified 30 — 99 16 11 — — 156 Total $ 751 $ 205 $ 846 $ 399 $ 146 $ 64 $ 123 $ 2,534 Other CRE - non-owner occupied Pass $ 1,398 $ 755 $ 673 $ 279 $ 186 $ 283 $ 315 $ 3,889 Special mention 15 — 10 — — 1 — 26 Classified — — 4 5 — 17 11 37 Total $ 1,413 $ 755 $ 687 $ 284 $ 186 $ 301 $ 326 $ 3,952 Residential Pass $ 7,459 $ 1,019 $ 396 $ 201 $ 42 $ 75 $ 36 $ 9,228 Special mention — — — — — — — — Classified 9 1 3 1 — 1 — 15 Total $ 7,468 $ 1,020 $ 399 $ 202 $ 42 $ 76 $ 36 $ 9,243 Construction and land development Pass $ 958 $ 632 $ 394 $ 112 $ 4 $ — $ 870 $ 2,970 Special mention — 22 — — 6 — — 28 Classified 1 4 1 — — — 2 8 Total $ 959 $ 658 $ 395 $ 112 $ 10 $ — $ 872 $ 3,006 Other Pass $ 16 $ 12 $ 4 $ 4 $ 4 $ 82 $ 46 $ 168 Special mention — — — — — — — — Classified — — — — — 1 — 1 Total $ 16 $ 12 $ 4 $ 4 $ 4 $ 83 $ 46 $ 169 Total by Risk Category Pass $ 15,024 $ 3,548 $ 2,935 $ 1,387 $ 950 $ 1,803 $ 12,808 $ 38,455 Special mention 46 54 120 79 6 3 23 331 Classified 45 22 121 29 20 30 22 289 Total $ 15,115 $ 3,624 $ 3,176 $ 1,495 $ 976 $ 1,836 $ 12,853 $ 39,075
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 September 30, 2022 Balance, Provision for (Recovery of) Credit Losses Charge-offs Recoveries Balance, (in millions) Warehouse lending $ 3.7 $ 0.7 $ — $ — $ 4.4 Municipal & nonprofit 13.6 1.6 — — 15.2 Tech & innovation 25.4 (0.2) — — 25.2 Equity fund resources 14.0 (3.1) — — 10.9 Other commercial and industrial 119.2 (14.7) 2.1 (3.8) 106.2 CRE - owner occupied 7.5 (0.8) — — 6.7 Hotel franchise finance 33.8 17.2 — — 51.0 Other CRE - non-owner occupied 22.1 11.2 — (0.1) 33.4 Residential 18.8 6.8 — — 25.6 Residential - EBO — — — — — Construction and land development 12.2 10.1 — (0.1) 22.4 Other 2.9 0.2 — — 3.1 Total $ 273.2 $ 29.0 $ 2.1 $ (4.0) $ 304.1 Nine Months Ended September 30, 2022 Balance, Provision for (Recovery of) Credit Losses Charge-offs Recoveries Balance, (in millions) Warehouse lending $ 3.0 $ 1.4 $ — $ — $ 4.4 Municipal & nonprofit 13.7 1.5 — — 15.2 Tech & innovation 25.7 (2.5) — (2.0) 25.2 Equity fund resources 9.6 1.3 — — 10.9 Other commercial and industrial 103.6 4.7 7.0 (4.9) 106.2 CRE - owner occupied 10.6 (4.0) — (0.1) 6.7 Hotel franchise finance 41.5 9.5 — — 51.0 Other CRE - non-owner occupied 16.9 16.4 — (0.1) 33.4 Residential 12.5 13.1 — — 25.6 Residential - EBO — — — — — Construction and land development 12.5 9.8 — (0.1) 22.4 Other 2.9 0.1 0.1 (0.2) 3.1 Total $ 252.5 $ 51.3 $ 7.1 $ (7.4) $ 304.1 Three Months Ended September 30, 2021 Balance, Provision for (Recovery of) Credit Losses Charge-offs Recoveries Balance, (in millions) Warehouse lending $ 3.2 $ (0.6) $ — $ — $ 2.6 Municipal & nonprofit 15.9 (0.7) — — 15.2 Tech & innovation 20.5 8.6 — (0.1) 29.2 Equity fund resources 1.1 6.1 — — 7.2 Other commercial and industrial 76.4 18.3 3.3 (0.2) 91.6 CRE - owner occupied 9.3 0.1 — — 9.4 Hotel franchise finance 49.4 0.2 — — 49.6 Other CRE - non-owner occupied 29.8 (9.7) — — 20.1 Residential 8.1 (2.0) — — 6.1 Construction and land development 14.1 (2.6) — — 11.5 Other 5.1 (0.7) — — 4.4 Total $ 232.9 $ 17.0 $ 3.3 $ (0.3) $ 246.9 Nine Months Ended September 30, 2021 Balance, Provision for (Recovery of) Credit Losses Charge-offs Recoveries Balance, (in millions) Warehouse lending $ 3.4 $ (0.8) $ — $ — $ 2.6 Municipal & nonprofit 15.9 (0.7) — — 15.2 Tech & innovation 33.4 (2.6) 2.0 (0.4) 29.2 Equity fund resources 1.9 5.3 — — 7.2 Other commercial and industrial 94.7 (0.2) 3.7 (0.8) 91.6 CRE - owner occupied 18.6 (9.2) — — 9.4 Hotel franchise finance 43.3 6.3 — — 49.6 Other CRE - non-owner occupied 39.9 (19.2) 2.0 (1.4) 20.1 Residential 0.8 5.2 — (0.1) 6.1 Construction and land development 22.0 (10.5) — — 11.5 Other 5.0 (1.1) — (0.5) 4.4 Total $ 278.9 $ (27.5) $ 7.7 $ (3.2) $ 246.9 Accrued interest receivable on loans totaled $263 million and $198 million at September 30, 2022 and December 31, 2021, respectively, and is excluded from the estimate of credit losses, except for accrued interest related to the Residential-EBO loan portfolio segment, which has an allowance of $7 million as of September 30, 2022. 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 September 30, Nine Months Ended September 30, 2022 2021 2022 2021 (in millions) Balance, beginning of period $ 53.8 $ 31.3 $ 37.6 $ 37.0 (Recovery of) provision for credit losses (1.7) 0.8 14.5 (4.9) Balance, end of period $ 52.1 $ 32.1 $ 52.1 $ 32.1 The following tables disaggregate the Company's allowance for credit losses on funded HFI loans and loan balances by measurement methodology: September 30, 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 $ 5,525 $ — $ 5,525 $ 4.4 $ — $ 4.4 Municipal & nonprofit 1,515 7 1,522 12.7 2.5 15.2 Tech & innovation 2,152 23 2,175 21.9 3.3 25.2 Equity fund resources 5,107 — 5,107 10.9 — 10.9 Other commercial and industrial 8,149 33 8,182 99.6 6.6 106.2 CRE - owner occupied 1,655 31 1,686 6.7 — 6.7 Hotel franchise finance 3,406 196 3,602 44.6 6.4 51.0 Other CRE - non-owner occupied 4,991 30 5,021 33.4 — 33.4 Residential 13,810 — 13,810 25.6 — 25.6 Residential EBO 1,815 — 1,815 — — — Construction and land development 3,569 10 3,579 22.4 — 22.4 Other 177 — 177 3.1 — 3.1 Total $ 51,871 $ 330 $ 52,201 $ 285.3 $ 18.8 $ 304.1 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 $ 5,156 $ — $ 5,156 $ 3.0 $ — $ 3.0 Municipal & nonprofit 1,579 — 1,579 13.7 — 13.7 Tech & innovation 1,401 17 1,418 22.9 2.8 25.7 Equity fund resources 3,830 — 3,830 9.6 — 9.6 Other commercial and industrial 6,442 23 6,465 101.1 2.5 103.6 CRE - owner occupied 1,699 24 1,723 10.6 — 10.6 Hotel franchise finance 2,378 156 2,534 30.7 10.8 41.5 Other CRE - non-owner occupied 3,917 35 3,952 16.9 — 16.9 Residential 9,243 — 9,243 12.5 — 12.5 Construction and land development 2,998 8 3,006 12.5 — 12.5 Other 169 — 169 2.9 — 2.9 Total $ 38,812 $ 263 $ 39,075 $ 236.4 $ 16.1 $ 252.5

Other Borrowings (Tables)

Other Borrowings (Tables)	9 Months Ended
	Sep. 30, 2022
Debt Disclosure [Abstract]
Company's Borrowings	The following table summarizes the Company’s borrowings as of September 30, 2022 and December 31, 2021: September 30, 2022 December 31, 2021 (in millions) Short-Term: Federal funds purchased $ 1,010 $ 675 FHLB advances 4,000 — Repurchase agreements 26 17 Secured borrowings 60 35 Total short-term borrowings $ 5,096 $ 727 Long-Term: AmeriHome senior notes, net of fair value adjustment $ 316 $ 318 Credit linked notes, net of debt issuance costs 907 457 Total long-term borrowings $ 1,223 $ 775 Total other borrowings $ 6,319 $ 1,502

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2022
Equity [Abstract]
Summary of Changes in Accumulated Other Comprehensive Income	Three Months Ended September 30, Unrealized holding gains (losses) on AFS securities Unrealized holding losses on SERP Unrealized holding gains (losses) on junior subordinated debt Total (in millions) Balance, June 30, 2022 $ (521.1) $ (0.3) $ 3.5 $ (517.9) Other comprehensive (loss) income before reclassifications (219.9) — 1.6 (218.3) Amounts reclassified from AOCI — — — — Net current-period other comprehensive (loss) income (219.9) — 1.6 (218.3) Balance, September 30, 2022 $ (741.0) $ (0.3) $ 5.1 $ (736.2) Balance, June 30, 2021 $ 64.8 $ (0.3) $ — $ 64.5 Other comprehensive loss before reclassifications (21.8) — (0.1) (21.9) Amounts reclassified from AOCI — — — — Net current-period other comprehensive loss (21.8) — (0.1) (21.9) Balance, September 30, 2021 $ 43.0 $ (0.3) $ (0.1) $ 42.6 Nine Months Ended September 30, Unrealized holding gains (losses) on AFS securities Unrealized holding 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 (752.3) — 5.8 (746.5) Amounts reclassified from AOCI (5.4) — — (5.4) Net current-period other comprehensive (loss) income (757.7) — 5.8 (751.9) Balance, September 30, 2022 $ (741.0) $ (0.3) $ 5.1 $ (736.2) Balance, December 31, 2020 $ 92.1 $ (0.3) $ 0.5 $ 92.3 Other comprehensive loss before reclassifications (49.0) — (0.6) (49.6) Amounts reclassified from AOCI (0.1) — — (0.1) Net current-period other comprehensive loss (49.1) — (0.6) (49.7) Balance, September 30, 2021 $ 43.0 $ (0.3) $ (0.1) $ 42.6

Derivatives and Hedging (Tables

Derivatives and Hedging (Tables)	3 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 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. 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 plus a spread adjustment 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 was identified as the hedged item. Under these interest rate swap contracts, the Company received a variable rate and paid a fixed rate on the outstanding notional amount. 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 million. During the nine months ended September 30, 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 $31 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 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 September 30, 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: September 30, 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) $ 447 $ 22 $ 1,391 $ 39 (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 $16 million and the basis adjustment related to the discontinued portion was $1 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 September 30, 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 $ 27.5 $ (27.5) $ 7.5 $ (7.4) Interest expense — — (0.5) 0.5 Nine Months Ended September 30, 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 $ 76.3 $ (76.2) $ 35.4 $ (35.3) Interest expense — — (2.4) 2.4 In addition to the gains and losses on the Company's outstanding fair value hedges presented in the above table, the Company recognized $3.0 million and $7.0 million in interest income related to the amortization of the cumulative basis adjustment on its discontinued last-of-layer hedges during the three and nine months ended September 30, 2022, respectively. 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 September 30, 2022, December 31, 2021, and September 30, 2021. The change in the notional amounts of these derivatives from September 30, 2021 to September 30, 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. September 30, 2022 December 31, 2021 September 30, 2021 Fair Value Fair Value Fair Value Notional Derivative Assets Derivative Liabilities Notional Derivative Assets Derivative Liabilities Notional Derivative Assets Derivative Liabilities (in millions) Derivatives designated as hedging instruments: Fair value hedges Interest rate swaps (1) $ 483 $ 22 $ — $ 1,383 $ 14 $ 55 $ 1,547 $ 7 $ 57 Total 483 22 — 1,383 14 55 1,547 7 57 Derivatives not designated as hedging instruments (2): Foreign currency contracts $ 146 $ 2 $ 1 $ 180 $ — $ 1 $ 118 $ 2 $ — Forward purchase contracts 8,226 3 249 11,714 8 18 6,551 1 37 Forward sales contracts 11,792 380 6 17,358 16 18 13,984 71 4 Futures purchase contracts (3) 172,333 — — 218,054 — — 224,325 — — Futures sales contracts (3) 180,454 — — 229,040 — — 232,527 — — Interest rate lock commitments 1,918 3 31 3,033 11 2 3,576 15 6 Interest rate swaps 2,155 5 5 4 — — 4 — — Options contracts — — — — — — 50 — — Total $ 377,024 $ 393 $ 292 $ 479,383 $ 35 $ 39 $ 481,135 $ 89 $ 47 Margin (100) (11) 1 6 1 37 Total, including margin $ 377,024 $ 293 $ 281 $ 479,383 $ 36 $ 45 $ 481,135 $ 90 $ 84 (1) Interest rate swap amounts include a notional amount of $880 million related to the last-of-layer hedges at December 31, 2021 and September 30, 2021. (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: September 30, 2022 December 31, 2021 September 30, 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 $ — $ 3 $ 8 $ — $ 8 $ 1 $ — $ 1 Forward sales contracts 360 — 360 15 — 15 69 — 69 Interest rate swaps 22 — 22 14 — 14 7 — 7 Margin (100) — (100) 1 — 1 1 — 1 Netting — (233) (233) — (28) (28) — (66) (66) $ 285 $ (233) $ 52 $ 38 $ (28) $ 10 $ 78 $ (66) $ 12 Liabilities Forward purchase contracts $ (242) $ — $ (242) $ (18) $ — $ (18) $ (37) $ — $ (37) Forward sales contracts (6) — (6) (18) — (18) (4) — (4) Interest rate swaps — — — (54) — (54) (57) — (57) Margin 11 — 11 (6) — (6) (37) — (37) Netting — 233 233 — 28 28 — 66 66 $ (237) $ 233 $ (4) $ (96) $ 28 $ (68) $ (135) $ 66 $ (69) Derivatives not subject to master netting arrangements: Assets Foreign currency contracts $ 2 $ — $ 2 $ — $ — $ — $ 2 $ — $ 2 Forward sales contracts 20 — 20 1 — 1 2 — 2 Interest rate lock commitments 3 — 3 11 — 11 15 — 15 Interest rate swaps 5 — 5 — — — — — — $ 30 $ — $ 30 $ 12 $ — $ 12 $ 19 $ — $ 19 Liabilities Foreign currency contracts $ (1) $ — $ (1) $ (2) $ — $ (2) $ — $ — $ — Forward purchase contracts (7) — (7) — — — — — — Interest rate lock commitments (31) — (31) (2) — (2) (6) — (6) Interest rate swaps (5) — (5) — — — — — — $ (44) $ — $ (44) $ (4) $ — $ (4) $ (6) $ — $ (6) Total derivatives and margin Assets $ 315 $ (233) $ 82 $ 50 $ (28) $ 22 $ 97 $ (66) $ 31 Liabilities $ (281) $ 233 $ (48) $ (100) $ 28 $ (72) $ (141) $ 66 $ (75) The following table summarizes the net gain (loss) on derivatives included in income: Three Months Ended September 30, Nine Months Ended September 30, 2022 2021 2022 2021 ($ in millions) Net gain (loss) on loan origination and sale activities: Interest rate lock commitments $ (39.3) $ (26.6) $ (36.9) $ (7.0) Forward contracts 145.3 17.1 487.6 (50.6) Interest rate swaps (8.6) — (8.6) — Other contracts 1.6 (2.4) (8.2) (0.1) Total gain (loss) $ 99.0 $ (11.9) $ 433.9 $ (57.7) Net loan servicing revenue: Forward contracts $ (18.0) $ (2.6) $ (60.9) $ 10.1 Options contracts — 1.4 — 0.4 Futures contracts 2.4 (8.9) (41.5) 15.7 Interest rate swaps (52.8) — (52.8) — Total loss $ (68.4) $ (10.1) $ (155.2) $ 26.2 Counterparty Credit Risk
Schedule of Derivative Assets at Fair Value	As of September 30, 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: September 30, 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) $ 447 $ 22 $ 1,391 $ 39 (1) Included in the carrying value of the hedged assets/(liabilities).
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 September 30, 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 $ 27.5 $ (27.5) $ 7.5 $ (7.4) Interest expense — — (0.5) 0.5 Nine Months Ended September 30, 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 $ 76.3 $ (76.2) $ 35.4 $ (35.3) Interest expense — — (2.4) 2.4 In addition to the gains and losses on the Company's outstanding fair value hedges presented in the above table, the Company recognized $3.0 million and $7.0 million in interest income related to the amortization of the cumulative basis adjustment on its discontinued last-of-layer hedges during the three and nine months ended September 30, 2022, respectively.

Earnings per Share (Tables)

Earnings per Share (Tables)	9 Months Ended
	Sep. 30, 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 September 30, Nine Months Ended September 30, 2022 2021 2022 2021 (in millions, except per share amounts) Weighted average shares - basic 107.5 103.3 107.0 102.3 Dilutive effect of stock awards 0.4 0.6 0.4 0.6 Weighted average shares - diluted 107.9 103.9 107.4 102.9 Net income available to common stockholders $ 260.8 $ 236.9 $ 754.7 $ 653.2 Earnings per share - basic 2.43 2.29 7.06 6.39 Earnings per share - diluted 2.42 2.28 7.03 6.35

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 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: September 30, 2022 December 31, 2021 (in millions) Commitments to extend credit, including unsecured loan commitments of $1,326 at September 30, 2022 and $1,200 at December 31, 2021 $ 18,229 $ 13,396 Credit card commitments and financial guarantees 365 307 Letters of credit, including unsecured letters of credit of $7 at September 30, 2022 and $13 at December 31, 2021 273 198 Total $ 18,867 $ 13,901

Fair Value Accounting (Tables)

Fair Value Accounting (Tables)	9 Months Ended
	Sep. 30, 2022
Fair Value Disclosures [Abstract]
Gains and Losses from Fair Value Changes Included in Consolidated Statement of Operations	For the three and nine months ended September 30, 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 Significant Other Observable Inputs Significant Unobservable Inputs Fair Value (in millions) September 30, 2022 Assets: Available-for-sale debt securities CLO $ — $ 2,641 $ — $ 2,641 Commercial MBS issued by GSEs — 62 — 62 Corporate debt securities — 391 — 391 Private label residential MBS — 1,228 — 1,228 Residential MBS issued by GSEs — 1,694 — 1,694 Tax-exempt — 874 — 874 Other 25 45 — 70 Total AFS debt securities $ 25 $ 6,935 $ — $ 6,960 Equity securities CRA investments $ 24 $ 25 $ — $ 49 Preferred stock 116 — — 116 Total equity securities $ 140 $ 25 $ — $ 165 Loans HFS $ — $ 2,052 $ 1 $ 2,053 Mortgage servicing rights — — 1,044 1,044 Derivative assets (1) — 312 3 315 Liabilities: Junior subordinated debt (2) $ — $ — $ 60 $ 60 Derivative liabilities (1) — 250 31 281 (1) See "Note 11. Derivatives and Hedging Activities." In addition, the carrying value of loans is decreased by $22 million as of September 30, 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 Significant Other Observable Inputs Significant Unobservable Inputs Fair Value (in millions) December 31, 2021 Assets: Available-for-sale debt securities CLO $ — $ 926 $ — $ 926 Commercial MBS issued by GSEs — 69 — 69 Corporate debt securities — 383 — 383 Private label residential MBS — 1,508 — 1,508 Residential MBS issued by GSEs — 1,993 — 1,993 Tax-exempt — 1,215 — 1,215 U.S. treasury securities 13 — — 13 Other 28 54 — 82 Total AFS debt securities $ 41 $ 6,148 $ — $ 6,189 Equity securities CRA investments $ 28 $ 17 $ — $ 45 Preferred stock 114 — — 114 Total equity securities $ 142 $ 17 $ — $ 159 Loans - HFS $ — $ 3,894 $ 46 $ 3,940 Mortgage servicing rights — — 698 698 Derivative assets (1) — 39 11 50 Liabilities: Junior subordinated debt (2) $ — $ — $ 67 $ 67 Derivative liabilities (1) — 98 2 100 (1) See "Note 11. Derivatives and Hedging Activities." In addition, the carrying value of loans is increased by $39 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 and nine months ended September 30, 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 September 30, Nine Months Ended September 30, 2022 2021 2022 2021 (in millions) Beginning balance $ (61.8) $ (66.5) $ (67.4) $ (65.9) Change in fair value (1) 2.1 (0.2) 7.7 (0.8) Ending balance $ (59.7) $ (66.7) $ (59.7) $ (66.7)
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 Active Markets for Similar Assets Unobservable Inputs (in millions) As of September 30, 2022: Loans HFI $ 254 $ — $ — $ 254 Other assets acquired through foreclosure 11 — — 11 As of December 31, 2021: Loans HFI $ 216 $ — $ — $ 216 Other assets acquired through foreclosure 12 — — 12
Estimated Fair Value of Financial Instruments	The estimated fair value of the Company’s financial instruments is as follows: September 30, 2022 Carrying Amount Fair Value Level 1 Level 2 Level 3 Total (in millions) Financial assets: Investment securities: HTM $ 1,270 $ — $ 1,084 $ — $ 1,084 AFS 6,960 25 6,935 — 6,960 Equity 165 140 25 — 165 Derivative assets 315 — 312 3 315 Loans HFS 2,204 — 2,053 152 2,205 Loans HFI, net 51,897 — — 50,068 50,068 Mortgage servicing rights 1,044 — — 1,044 1,044 Accrued interest receivable 313 — 313 — 313 Financial liabilities: Deposits $ 55,589 $ — $ 55,600 $ — $ 55,600 Other borrowings 6,319 — 6,217 — 6,217 Qualifying debt 889 — 743 72 815 Derivative liabilities 281 — 250 31 281 Accrued interest payable 20 — 20 — 20 December 31, 2021 Carrying Amount Fair Value Level 1 Level 2 Level 3 Total (in millions) Financial assets: Investment securities: HTM $ 1,107 $ — $ 1,146 $ — $ 1,146 AFS 6,189 41 6,148 — 6,189 Equity securities 159 142 17 — 159 Derivative assets 50 — 39 11 50 Loans HFS 5,635 — 3,894 1,760 5,654 Loans HFI, net 38,823 — — 39,218 39,218 Mortgage servicing rights 698 — — 698 698 Accrued interest receivable 228 — 228 — 228 Financial liabilities: Deposits $ 47,612 $ — $ 47,616 $ — $ 47,616 Other borrowings 1,502 — 1,518 — 1,518 Qualifying debt 896 — 858 81 939 Derivative liabilities 100 — 98 2 100 Accrued interest payable 9 — 9 — 9

Segments (Tables)

Segments (Tables)	9 Months Ended
	Sep. 30, 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 September 30, 2022: (in millions) Assets: Cash, cash equivalents, and investment securities $ 10,213 $ 12 $ — $ 10,201 Loans held for sale 2,204 — 2,204 — Loans, net of deferred fees and costs 52,201 32,060 20,141 — Less: allowance for credit losses (304) (266) (38) — Total loans 51,897 31,794 20,103 — Other assets acquired through foreclosure, net 11 11 — — Goodwill and other intangible assets, net 682 294 388 — Other assets 4,158 370 1,890 1,898 Total assets $ 69,165 $ 32,481 $ 24,585 $ 12,099 Liabilities: Deposits $ 55,589 $ 30,006 $ 20,957 $ 4,626 Borrowings and qualifying debt 7,208 26 375 6,807 Other liabilities 1,347 105 447 795 Total liabilities 64,144 30,137 21,779 12,228 Allocated equity: 5,021 2,802 1,711 508 Total liabilities and stockholders' equity $ 69,165 $ 32,939 $ 23,490 $ 12,736 Excess funds provided (used) — 458 (1,095) 637 Income Statement: Three Months Ended September 30, 2022: (in millions) Net interest income $ 602.1 $ 413.0 $ 235.0 $ (45.9) Provision for credit losses 28.5 19.9 7.6 1.0 Net interest income (expense) after provision for credit losses 573.6 393.1 227.4 (46.9) Non-interest income 61.8 16.1 44.2 1.5 Non-interest expense 305.8 111.0 178.4 16.4 Income (loss) before income taxes 329.6 298.2 93.2 (61.8) Income tax expense (benefit) 65.6 71.0 22.3 (27.7) Net income (loss) $ 264.0 $ 227.2 $ 70.9 $ (34.1) Nine Months Ended September 30, 2022: (in millions) Net interest income $ 1,576.6 $ 1,118.3 $ 637.7 $ (179.4) Provision for (recovery of) credit losses 65.0 53.1 12.9 (1.0) Net interest income (expense) after provision for credit losses 1,511.6 1,065.2 624.8 (178.4) Non-interest income 263.1 51.0 198.0 14.1 Non-interest expense 823.3 341.4 442.5 39.4 Income (loss) before income taxes 951.4 774.8 380.3 (203.7) Income tax expense (benefit) 187.1 184.4 90.8 (88.1) Net income (loss) $ 764.3 $ 590.4 $ 289.5 $ (115.6) Balance Sheet: Consolidated Company Commercial Consumer Related Corporate At December 31, 2021: (in millions) Assets: Cash, cash equivalents, and investment securities $ 8,057 $ 13 $ 82 $ 7,962 Loans held for sale 5,635 — 5,635 — Loans, net of deferred fees and costs 39,075 25,092 13,983 — Less: allowance for credit losses (252) (226) (26) — Total loans 38,823 24,866 13,957 — Other assets acquired through foreclosure, net 12 12 — — Goodwill and other intangible assets, net 635 295 340 — Other assets 2,821 254 1,278 1,289 Total assets $ 55,983 $ 25,440 $ 21,292 $ 9,251 Liabilities: Deposits $ 47,612 $ 30,467 $ 15,363 $ 1,782 Borrowings and qualifying debt 2,398 — 353 2,045 Other liabilities 1,010 233 138 639 Total liabilities 51,020 30,700 15,854 4,466 Allocated equity: 4,963 2,588 1,596 779 Total liabilities and stockholders' equity $ 55,983 $ 33,288 $ 17,450 $ 5,245 Excess funds provided (used) — 7,848 (3,842) (4,006) Income Statements: Three Months Ended September 30, 2021: (in millions) Net interest income $ 410.4 $ 304.4 $ 170.3 $ (64.3) Provision for (recovery of) credit losses 12.3 19.3 (5.5) (1.5) Net interest income (expense) after provision for credit losses 398.1 285.1 175.8 (62.8) Non-interest income 138.1 15.1 123.8 (0.8) Non-interest expense 233.8 107.0 123.6 3.2 Income (loss) before income taxes 302.4 193.2 176.0 (66.8) Income tax expense (benefit) 65.5 46.5 42.6 (23.6) Net income (loss) $ 236.9 $ 146.7 $ 133.4 $ (43.2) Nine Months Ended September 30, 2021: (in millions) Net interest income $ 1,098.2 $ 848.8 $ 417.8 $ (168.4) (Recovery of) provision for credit losses (34.6) (35.5) 3.4 (2.5) Net interest income (expense) after provision for credit losses 1,132.8 884.3 414.4 (165.9) Non-interest income 293.8 48.2 241.1 4.5 Non-interest expense 613.6 309.4 294.4 9.8 Income (loss) before income taxes 813.0 623.1 361.1 (171.2) Income tax expense (benefit) 159.8 149.8 87.5 (77.5) Net income (loss) $ 653.2 $ 473.3 $ 273.6 $ (93.7)

Summary of Significant Accoun_3

Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2022 USD ($) Subsidiary	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 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
Loans and Leases Receivable, Allowance	$ 304		$ 252
Deferred Income Tax Assets, Net	302		21
Off-Balance Sheet, Credit Loss, Liability	52.1	$ 53.8	37.6	$ 32.1	$ 31.3	$ 37
Retained earnings	$ (3,413)		$ (2,773)

Business Combinations (Details)

Business Combinations (Details) - USD ($) $ in Millions			3 Months Ended		6 Months Ended	9 Months Ended
	Jan. 25, 2022	Apr. 07, 2021	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2022	Sep. 30, 2022	Sep. 30, 2021
Business Combinations [Abstract]
Business Acquisition, Effective Date of Acquisition	Jan. 25, 2022	Apr. 07, 2021
Business Combination, Consideration Transferred	$ 57	$ 1,918.4
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	20.1	141
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
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
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	20.8	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
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	20.4	1,718.6
Payments to Acquire Businesses, Gross	50.6	1,231.6			$ 1,200
Goodwill	$ 36.6	$ 199.8
Business Acquisition, Effective Date of Acquisition	Jan. 25, 2022	Apr. 07, 2021
Business Combination, Consideration Transferred	$ 57	$ 1,918.4
Business Combination, Elimination of Pre-existing debt and other		686.8
Business Acquisition, Pro Forma Revenue				$ 442.8			$ 1,196.6
Business Acquisition, Pro Forma Non-interest Income				122.8			344.8
Business Acquisition, Pro Forma Net Income (Loss)				236.9			660.9
Acquisition and restructure expenses			$ 0	$ 2.4		$ 0.4	$ 18.5
Business Acquisition, Goodwill, Expected Tax Deductible Amount		$ 185
Business Combination, Contingent Consideration, Liability	$ 6.4
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles			7.4
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments Related to Previous Period			0.5
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred			$ 10.8

Investment Securities - Carryin

Investment Securities - Carrying Amounts and Fair Values of Investment Securities (Detail) - USD ($) $ in Millions	Sep. 30, 2022		Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	$ 165	[1]	$ 159	[2]
Debt Securities, Held-to-maturity	1,270		1,107
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0		43
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(186)		(4)
Debt Securities, Held-to-maturity, Fair Value	1,084		1,146
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	991		81
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	7		103
Debt Securities, Available-for-sale	6,960	[1]	6,189	[2]
Securities available for sale Total, Amortized Cost	7,944		6,167
Equity Securities, FV-NI, Cost	177		152
Equity Securities, FV-NI, Unrealized Gain	0		8
Equity Securities, FV-NI, Unrealized Loss	12		1
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	8		0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0		1
Debt Securities, Available-for-sale	62		69
Securities available for sale Total, Amortized Cost	70		68
Corporate Bond Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	38		9
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0		9
Debt Securities, Available-for-sale	391		383
Securities available for sale Total, Amortized Cost	429		383
Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity	201		217
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0		0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(44)		(2)
Debt Securities, Held-to-maturity, Fair Value	157		215
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	245		24
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0		3
Debt Securities, Available-for-sale	1,228		1,508
Securities available for sale Total, Amortized Cost	1,473		1,529
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	391		42
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0		7
Debt Securities, Available-for-sale	1,694		1,993
Securities available for sale Total, Amortized Cost	2,085		2,028
Nontaxable Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity	1,069		890
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0		43
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(142)		(2)
Debt Securities, Held-to-maturity, Fair Value	927		931
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	152		1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0		71
Debt Securities, Available-for-sale	874		1,215
Securities available for sale Total, Amortized Cost	1,026		1,145
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
Securities available for sale Total, Amortized Cost			13
CRA investments [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	49		45
Equity Securities, FV-NI, Cost	53		45
Equity Securities, FV-NI, Unrealized Gain	0		0
Equity Securities, FV-NI, Unrealized Loss	4		0
Preferred Stock [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	116		114
Equity Securities, FV-NI, Cost	124		107
Equity Securities, FV-NI, Unrealized Gain	0		8
Equity Securities, FV-NI, Unrealized Loss	8		1
Collateralized Loan Obligations
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	145		1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0		1
Debt Securities, Available-for-sale	2,641		926
Securities available for sale Total, Amortized Cost	2,786		926
Other Security Investments
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	12		4
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	7		11
Debt Securities, Available-for-sale	70		82
Securities available for sale Total, Amortized Cost	75		75
AAA [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	0	[1]	0	[2]
Debt Securities, Held-to-maturity	0		0
Debt Securities, Available-for-sale	1,428	[1]	1,508	[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	1,136		1,420
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	15		43
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	277		45
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	24	[1]	28	[2]
Debt Securities, Held-to-maturity	0		0
Debt Securities, Available-for-sale	1,771	[1]	2,115	[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		69
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	1,694		1,993
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	15		40
Split-rated AAA/AA Plus [Member] | US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale			13
Split-rated AAA/AA Plus [Member] | CRA investments [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	24		28
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		0
Debt Securities, Available-for-sale	2,588	[1]	1,204	[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	91		87
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	392		469
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	2,096		636
AA Plus to AA- [Member] | Other Security Investments
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	9		12
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		0
Debt Securities, Available-for-sale	769	[1]	929	[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	75		45
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	417		629
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	268		245
A Plus to A- [Member] | Other Security Investments
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	9		10
BBB Plus to BBB- [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	89	[1]	79	[2]
Debt Securities, Held-to-maturity	0		0
Debt Securities, Available-for-sale	344	[1]	350	[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	316		319
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	1		1
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	89		79
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	27		30
BB Plus and below [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	17	[1]	20	[2]
Debt Securities, Held-to-maturity	0		0
Debt Securities, Available-for-sale	7	[1]	29	[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		19
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	17		20
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	7		10
Corporate Credit Quality Indicator Unrated [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	35	[1]	32	[2]
Debt Securities, Held-to-maturity	1,270		1,107
Debt Securities, Available-for-sale	53	[1]	54	[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	201		217
Debt Securities, Available-for-sale	0		0
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	1,069		890
Debt Securities, Available-for-sale	35		34
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	25		17
Corporate Credit Quality Indicator Unrated [Member] | Preferred Stock [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	10		15
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	$ 18		$ 20
[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.

Investment Securities - Additio

Investment Securities - Additional Information (Detail) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2022 USD ($) positions	Sep. 30, 2022 USD ($) positions	Dec. 31, 2021 USD ($) positions
Pledged Securities [Abstract]
Accrued Investment Income Receivable	$ 4	$ 4	$ 3
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | positions	766	766	179
Debt Securities, Available-for-sale, Realized Gain (Loss)	$ 0	$ 6.7
Debt Securities, Available-for-Sale, Pledged Status [Extensible Enumeration]	Asset Pledged as Collateral	Asset Pledged as Collateral	Asset Pledged as Collateral

Investment Securities - Unreali

Investment Securities - Unrealized Losses and Fair Value of Investment Securities in Continuous Unrealized Loss Position (Detail) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($) positions	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) positions	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) positions
Debt Securities, Available-for-sale [Line Items]
Unrealized gains (losses) on assets measured at fair value, net	$ (2.8)	$ (2.2)	$ (19.4)	$ (0.5)
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	991		991		$ 81
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	388		388		13
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	603		603		68
Debt Securities, Available-for-sale, Unrealized Loss Position	6,829		6,829		3,216
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,499		1,499		170
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 5,330		$ 5,330		$ 3,046
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | positions	766		766		179
Corporate Bond Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 38		$ 38		$ 9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	6		6		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	32		32		9
Debt Securities, Available-for-sale, Unrealized Loss Position	389		389		107
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	94		94		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	295		295		107
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	391		391		41
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	227		227		9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	164		164		32
Debt Securities, Available-for-sale, Unrealized Loss Position	1,692		1,692		1,498
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	746		746		142
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	946		946		1,356
Nontaxable Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	152		152		1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	27		27		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	125		125		1
Debt Securities, Available-for-sale, Unrealized Loss Position	831		831		141
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	73		73		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	758		758		141
Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	245		245		24
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	110		110		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	135		135		24
Debt Securities, Available-for-sale, Unrealized Loss Position	1,220		1,220		1,250
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	424		424		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	796		796		1,250
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	8		8		1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	4		4		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	4		4		1
Debt Securities, Available-for-sale, Unrealized Loss Position	62		62		19
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	14		14		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	48		48		19
Other Security Investments
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	12		12		4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	7		7		4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	5		5		0
Debt Securities, Available-for-sale, Unrealized Loss Position	52		52		30
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	25		25		28
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	27		27		2
Collateralized Loan Obligations
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	145		145		1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	7		7		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	138		138		1
Debt Securities, Available-for-sale, Unrealized Loss Position	2,583		2,583		171
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	123		123		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 2,460		$ 2,460		$ 171

Investment Securities - Amortiz

Investment Securities - Amortized Cost and Fair Value of Investment Securities by Contractual Maturities (Detail) - USD ($) $ in Millions	Sep. 30, 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	$ 3
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	23
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Amortized Cost	1,013
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	3
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	22
Held-to-maturity Securities, Debt Maturities, Rolling Year Six Through Ten, Fair Value	28
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	29
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	874
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value	157
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Amortized Cost	201
Debt Securities, Held-to-maturity	1,270		$ 1,107
Debt Securities, Held-to-maturity, Fair Value	1,084		1,146
Securities available for sale, Due in one year or less, Amortized Cost	1
Securities available for sale, After one year through five years, Amortized Cost	172
Securities available for sale, After five years through ten years, Amortized Cost	1,147
Securities available for sale, After ten years, Amortized Cost	2,997
Securities available for sale, Mortgage backed securities, Amortized Cost	3,627
Securities available for sale Total, Amortized Cost	7,944		6,167
Securities available for sale, Due in one year or less, Estimated Fair Value	1
Securities available for sale, After one year through five years, Estimated Fair Value	159
Securities available for sale, After five years through ten years, Estimated Fair Value	1,083
Securities available for sale, After ten years, Estimated Fair Value	2,733
Securities available for sale, Mortgage backed securities, Estimated Fair Value	2,984
Securities available for sale Total, Estimated Fair Value	$ 6,960	[1]	$ 6,189	[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.

Investment Securities - Investm

Investment Securities - Investment Securities by Credit Rating Type (Detail) - USD ($) $ in Millions	Sep. 30, 2022		Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity	$ 1,270		$ 1,107
Debt Securities, Available-for-sale	6,960	[1]	6,189	[2]
Investment securities - equity	165	[1]	159	[2]
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	1,694		1,993
Nontaxable Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity	1,069		890
Debt Securities, Available-for-sale	874		1,215
Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	62		69
Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity	201		217
Debt Securities, Available-for-sale	1,228		1,508
US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale			13
Preferred Stock [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	116		114
Corporate Bond Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	391		383
CRA investments [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	49		45
Other Security Investments
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	70		82
Collateralized Loan Obligations
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	2,641		926
A Plus to A- [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity	0		0
Debt Securities, Available-for-sale	769	[1]	929	[2]
Investment securities - equity	0	[1]	0	[2]
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	417		629
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] | 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] | US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale			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] | Corporate Bond Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	75		45
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] | Other Security Investments
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	9		10
A Plus to A- [Member] | Collateralized Loan Obligations
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	$ 268		$ 245
[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.

Investment Securities - Gross G

Investment Securities - Gross Gains and (Losses) on Sales of Investments (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2022
Investments, Debt and Equity Securities [Abstract]
Debt Securities, Available-for-sale, Realized Gain (Loss)	$ 0	$ 6.7

Investment Securities Investmen

Investment Securities Investment Securities - Allowance for Credit Losses - HTM (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest	$ 4.4	$ 4.5	$ 4.4	$ 4.5	$ 3.2	$ 5.2	$ 6	$ 6.8
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, Credit Loss Expense (Reversal)	(1.2)	(1.5)	0.8	(2.3)
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0	0	0	0
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	0	$ 0	0	$ 0
Accrued Investment Income Receivable	$ 4		$ 4			$ 3

Loans Held For Sale (Details)

Loans Held For Sale (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Loans and Leases Receivable Disclosure [Line Items]
Loans Receivable Held-for-sale, Amount	$ 2,204		$ 2,204		$ 5,635
Proceeds from Sale of Mortgage Loans Held-for-sale	(207.1)	$ (107.4)	(905.7)	$ (251)
MSR capitalized upon sale of loan	180.6	230.4	578.1	512.7
Provision for and change in estimate of liability for losses under representations and warranties	0.7	1.1	2.3	0.4
Change in fair value of loans held for sale	(75.1)	(18.4)	(82)	(5.2)
Unrealized Gain (Loss) on Derivatives	80.7	24	112.1	(31.2)
Derivative Instruments Not Designated as Hedging Instruments, Gain	18.3	(35.9)	321.8	(26.5)
Derivative, Gain (Loss) on Derivative, Net	99	(11.9)	433.9	(57.7)
Gain (Loss) on Sales of Loans, Net	(1.9)	93.8	26.6	199.2
Loan acquisition and origination fees	16.4	27.2	52	53.8
Net gain on loan origination and sale activities	14.5	$ 121	78.6	$ 253
Purchased from Ginnie Mae
Loans and Leases Receivable Disclosure [Line Items]
Loans Receivable Held-for-sale, Amount	141		141		1,693
Purchased from correspondent seller
Loans and Leases Receivable Disclosure [Line Items]
Loans Receivable Held-for-sale, Amount	872		872		1,396
Loans Insured or Guaranteed by US Government Authorities
Loans and Leases Receivable Disclosure [Line Items]
Loans Receivable Held-for-sale, Amount	1,013		1,013		3,089
US Government Agency Insured Loans
Loans and Leases Receivable Disclosure [Line Items]
Loans Receivable Held-for-sale, Amount	1,191		1,191		2,483
Non-agency
Loans and Leases Receivable Disclosure [Line Items]
Loans Receivable Held-for-sale, Amount	$ 0		$ 0		$ 63

Loans, Leases and Allowance f_2

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	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Net of Deferred Income	$ 52,201		$ 39,075
Loans and Leases Receivable, Allowance	(304.1)	$ (273.2)	(252.5)	$ (246.9)	$ (232.9)	$ (278.9)
Loans, net	51,897		38,823
Net deferred loan fees and costs	(141)		(86)
Receivable with Imputed Interest, Premium	197		185
Loans Receivable Held-for-sale, Amount	2,204		5,635
Tech & Innovation [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Net of Deferred Income	2,175		1,418
Loans and Leases Receivable, Allowance	(25.2)	(25.4)	(25.7)	(29.2)	(20.5)	(33.4)
Other commercial and industrial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Net of Deferred Income	8,182		6,465
Loans and Leases Receivable, Allowance	(106.2)	(119.2)	(103.6)	(91.6)	(76.4)	(94.7)
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,686		1,723
Loans and Leases Receivable, Allowance	(6.7)	(7.5)	(10.6)	(9.4)	(9.3)	(18.6)
Hotel franchise finance [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Net of Deferred Income	3,602		2,534
Loans and Leases Receivable, Allowance	(51)	(33.8)	(41.5)	(49.6)	(49.4)	(43.3)
Other Commercial Real Estate Non owner Occupied [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,021		3,952
Loans and Leases Receivable, Allowance	(33.4)	(22.1)	(16.9)	(20.1)	(29.8)	(39.9)
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Net of Deferred Income	13,810		9,243
Loans and Leases Receivable, Allowance	(25.6)	(18.8)	(12.5)	(6.1)	(8.1)	(0.8)
Construction And Land Development Land [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Net of Deferred Income	3,579		3,006
Warehouse lending [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,525		5,156
Loans and Leases Receivable, Allowance	(4.4)	(3.7)	(3)	(2.6)	(3.2)	(3.4)
Municipal and nonprofit [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,522		1,579
Loans and Leases Receivable, Allowance	(15.2)	(13.6)	(13.7)	(15.2)	(15.9)	(15.9)
Other, loan segment
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Net of Deferred Income	177		169
Loans and Leases Receivable, Allowance	(3.1)	(2.9)	(2.9)	(4.4)	(5.1)	(5)
Equity fund resources
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,107		3,830
Loans and Leases Receivable, Allowance	(10.9)	(14)	(9.6)	$ (7.2)	$ (1.1)	$ (1.9)
Residential - EBO
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,815		0
Loans and Leases Receivable, Allowance	$ 0	$ 0	$ 0

Loans, Leases and Allowance f_3

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		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with an Allowance for Credit Loss	$ 51		$ 51		$ 34
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing	644		644		0
Financing Receivable, Excluding Accrued Interest, Nonaccrual	90		90		73
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	39		39		39
Loans Receivable Held-for-sale, Amount	2,204		2,204		5,635
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans	1.3	$ 1.4	3.6	$ 4.4
Loans and Leases Receivable, Net of Deferred Income	52,201		52,201		39,075
Tech & Innovation [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with an Allowance for Credit Loss	4		4		11
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing	0		0		0
Financing Receivable, Excluding Accrued Interest, Nonaccrual	4		4		13
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	0		0		2
Loans and Leases Receivable, Net of Deferred Income	2,175		2,175		1,418
Other commercial and industrial [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with an Allowance for Credit Loss	6		6		3
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing	0		0		0
Financing Receivable, Excluding Accrued Interest, Nonaccrual	18		18		16
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	12		12		13
Loans and Leases Receivable, Net of Deferred Income	8,182		8,182		6,465
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with an Allowance for Credit Loss	2		2		1
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing	0		0		0
Financing Receivable, Excluding Accrued Interest, Nonaccrual	11		11		13
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	9		9		12
Loans and Leases Receivable, Net of Deferred Income	1,686		1,686		1,723
Hotel franchise finance [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with an Allowance for Credit Loss	10		10
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing	0		0
Financing Receivable, Excluding Accrued Interest, Nonaccrual	10		10
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	0		0
Loans and Leases Receivable, Net of Deferred Income	3,602		3,602		2,534
Other Commercial Real Estate Non owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with an Allowance for Credit Loss	2		2		2
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing	0		0		0
Financing Receivable, Excluding Accrued Interest, Nonaccrual	19		19		13
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	17		17		11
Loans and Leases Receivable, Net of Deferred Income	5,021		5,021		3,952
Residential Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with an Allowance for Credit Loss	20		20		15
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing	0		0		0
Financing Receivable, Excluding Accrued Interest, Nonaccrual	20		20		15
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	0		0		0
Loans and Leases Receivable, Net of Deferred Income	13,810		13,810		9,243
Construction And Land Development [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with an Allowance for Credit Loss	0		0		0
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing	0		0		0
Financing Receivable, Excluding Accrued Interest, Nonaccrual	1		1		1
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	1		1		1
Loans and Leases Receivable, Net of Deferred Income	3,579		3,579		3,006
Warehouse lending [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,525		5,525		5,156
Municipal and nonprofit [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with an Allowance for Credit Loss	7		7
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing	0		0
Financing Receivable, Excluding Accrued Interest, Nonaccrual	7		7
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	0		0
Loans and Leases Receivable, Net of Deferred Income	1,522		1,522		1,579
Other, loan segment
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with an Allowance for Credit Loss					1
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing					0
Financing Receivable, Excluding Accrued Interest, Nonaccrual					1
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance					0
Loans and Leases Receivable, Net of Deferred Income	177		177		169
Construction And Land Development Land [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	3,579		3,579		3,006
Equity fund resources
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with an Allowance for Credit Loss					1
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing					0
Financing Receivable, Excluding Accrued Interest, Nonaccrual					1
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance					0
Loans and Leases Receivable, Net of Deferred Income	5,107		5,107		3,830
Residential - EBO
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with an Allowance for Credit Loss	0		0
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing	644		644
Financing Receivable, Excluding Accrued Interest, Nonaccrual	0		0
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	0		0
Loans and Leases Receivable, Net of Deferred Income	$ 1,815		$ 1,815		$ 0

Contractual Aging of Loan Portf

Contractual Aging of Loan Portfolio by Segment (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	$ 52,201	$ 39,075
Financing Receivable, Originated in Current Fiscal Year	13,949	15,115
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	16,375	3,624
Financing Receivable, Originated Two Years before Latest Fiscal Year	4,112	3,176
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,570	1,495
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,478	976
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,367	1,836
Financing Receivable, Revolving	11,350	12,853
Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	51,532	38,455
Financing Receivable, Originated in Current Fiscal Year	13,886	15,024
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	16,240	3,548
Financing Receivable, Originated Two Years before Latest Fiscal Year	4,008	2,935
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,356	1,387
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,414	950
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,327	1,803
Financing Receivable, Revolving	11,301	12,808
Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	312	331
Financing Receivable, Originated in Current Fiscal Year	27	46
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	80	54
Financing Receivable, Originated Two Years before Latest Fiscal Year	90	120
Financing Receivable, Originated Three Years before Latest Fiscal Year	79	79
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	6
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1	3
Financing Receivable, Revolving	35	23
Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	357	289
Financing Receivable, Originated in Current Fiscal Year	36	45
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	55	22
Financing Receivable, Originated Two Years before Latest Fiscal Year	14	121
Financing Receivable, Originated Three Years before Latest Fiscal Year	135	29
Financing Receivable, Originated Four Years before Latest Fiscal Year	64	20
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	39	30
Financing Receivable, Revolving	14	22
Tech & Innovation [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	2,175	1,418
Financing Receivable, Originated in Current Fiscal Year	663	792
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	535	167
Financing Receivable, Originated Two Years before Latest Fiscal Year	89	108
Financing Receivable, Originated Three Years before Latest Fiscal Year	80	6
Financing Receivable, Originated Four Years before Latest Fiscal Year	5	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1	1
Financing Receivable, Revolving	802	344
Tech & Innovation [Member] | Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	2,091	1,362
Financing Receivable, Originated in Current Fiscal Year	639	763
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	510	157
Financing Receivable, Originated Two Years before Latest Fiscal Year	86	101
Financing Receivable, Originated Three Years before Latest Fiscal Year	71	6
Financing Receivable, Originated Four Years before Latest Fiscal Year	5	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1	1
Financing Receivable, Revolving	779	334
Tech & Innovation [Member] | Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	61	39
Financing Receivable, Originated in Current Fiscal Year	20	26
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	17	5
Financing Receivable, Originated Two Years before Latest Fiscal Year	3	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	21	8
Tech & Innovation [Member] | Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	23	17
Financing Receivable, Originated in Current Fiscal Year	4	3
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	8	5
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	7
Financing Receivable, Originated Three Years before Latest Fiscal Year	9	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	2	2
Other commercial and industrial [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	8,182	6,465
Financing Receivable, Originated in Current Fiscal Year	2,682	2,916
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,852	397
Financing Receivable, Originated Two Years before Latest Fiscal Year	284	415
Financing Receivable, Originated Three Years before Latest Fiscal Year	402	230
Financing Receivable, Originated Four Years before Latest Fiscal Year	342	81
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	252	98
Financing Receivable, Revolving	2,368	2,328
Other commercial and industrial [Member] | Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	8,088	6,352
Financing Receivable, Originated in Current Fiscal Year	2,676	2,911
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,817	360
Financing Receivable, Originated Two Years before Latest Fiscal Year	259	387
Financing Receivable, Originated Three Years before Latest Fiscal Year	393	210
Financing Receivable, Originated Four Years before Latest Fiscal Year	339	80
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	251	98
Financing Receivable, Revolving	2,353	2,306
Other commercial and industrial [Member] | Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	59	87
Financing Receivable, Originated in Current Fiscal Year	1	5
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	32	27
Financing Receivable, Originated Two Years before Latest Fiscal Year	20	22
Financing Receivable, Originated Three Years before Latest Fiscal Year	3	18
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	3	15
Other commercial and industrial [Member] | Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	35	26
Financing Receivable, Originated in Current Fiscal Year	5	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	3	10
Financing Receivable, Originated Two Years before Latest Fiscal Year	5	6
Financing Receivable, Originated Three Years before Latest Fiscal Year	6	2
Financing Receivable, Originated Four Years before Latest Fiscal Year	3	1
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1	0
Financing Receivable, Revolving	12	7
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,686	1,723
Financing Receivable, Originated in Current Fiscal Year	330	419
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	371	201
Financing Receivable, Originated Two Years before Latest Fiscal Year	185	221
Financing Receivable, Originated Three Years before Latest Fiscal Year	168	205
Financing Receivable, Originated Four Years before Latest Fiscal Year	219	286
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	370	335
Financing Receivable, Revolving	43	56
Commercial Real Estate Owner Occupied [Member] | Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,638	1,682
Financing Receivable, Originated in Current Fiscal Year	322	417
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	359	199
Financing Receivable, Originated Two Years before Latest Fiscal Year	184	220
Financing Receivable, Originated Three Years before Latest Fiscal Year	168	190
Financing Receivable, Originated Four Years before Latest Fiscal Year	214	278
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	359	322
Financing Receivable, Revolving	32	56
Commercial Real Estate Owner Occupied [Member] | Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	14	12
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	10
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1	2
Financing Receivable, Revolving	11	0
Commercial Real Estate Owner Occupied [Member] | Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	34	29
Financing Receivable, Originated in Current Fiscal Year	8	2
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	10	2
Financing Receivable, Originated Two Years before Latest Fiscal Year	1	1
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	5
Financing Receivable, Originated Four Years before Latest Fiscal Year	5	8
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	10	11
Financing Receivable, Revolving	0	0
Hotel franchise finance [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	3,602	2,534
Financing Receivable, Originated in Current Fiscal Year	1,404	751
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	747	205
Financing Receivable, Originated Two Years before Latest Fiscal Year	80	846
Financing Receivable, Originated Three Years before Latest Fiscal Year	723	399
Financing Receivable, Originated Four Years before Latest Fiscal Year	366	146
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	164	64
Financing Receivable, Revolving	118	123
Hotel franchise finance [Member] | Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	3,329	2,239
Financing Receivable, Originated in Current Fiscal Year	1,386	721
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	727	205
Financing Receivable, Originated Two Years before Latest Fiscal Year	54	659
Financing Receivable, Originated Three Years before Latest Fiscal Year	559	332
Financing Receivable, Originated Four Years before Latest Fiscal Year	321	135
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	164	64
Financing Receivable, Revolving	118	123
Hotel franchise finance [Member] | Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	77	139
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	26	88
Financing Receivable, Originated Three Years before Latest Fiscal Year	51	51
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	0	0
Hotel franchise finance [Member] | Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	196	156
Financing Receivable, Originated in Current Fiscal Year	18	30
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	20	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	99
Financing Receivable, Originated Three Years before Latest Fiscal Year	113	16
Financing Receivable, Originated Four Years before Latest Fiscal Year	45	11
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	0	0
Other Commercial Real Estate Non owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,021	3,952
Financing Receivable, Originated in Current Fiscal Year	1,956	1,413
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,214	755
Financing Receivable, Originated Two Years before Latest Fiscal Year	874	687
Financing Receivable, Originated Three Years before Latest Fiscal Year	290	284
Financing Receivable, Originated Four Years before Latest Fiscal Year	176	186
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	252	301
Financing Receivable, Revolving	259	326
Other Commercial Real Estate Non owner Occupied [Member] | Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	4,937	3,889
Financing Receivable, Originated in Current Fiscal Year	1,950	1,398
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,187	755
Financing Receivable, Originated Two Years before Latest Fiscal Year	874	673
Financing Receivable, Originated Three Years before Latest Fiscal Year	268	279
Financing Receivable, Originated Four Years before Latest Fiscal Year	166	186
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	233	283
Financing Receivable, Revolving	259	315
Other Commercial Real Estate Non owner Occupied [Member] | Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	52	26
Financing Receivable, Originated in Current Fiscal Year	6	15
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	27	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	10
Financing Receivable, Originated Three Years before Latest Fiscal Year	19	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	1
Financing Receivable, Revolving	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	32	37
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	4
Financing Receivable, Originated Three Years before Latest Fiscal Year	3	5
Financing Receivable, Originated Four Years before Latest Fiscal Year	10	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	19	17
Financing Receivable, Revolving	0	11
Residential Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	13,810	9,243
Financing Receivable, Originated in Current Fiscal Year	3,715	7,468
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	8,594	1,020
Financing Receivable, Originated Two Years before Latest Fiscal Year	891	399
Financing Receivable, Originated Three Years before Latest Fiscal Year	321	202
Financing Receivable, Originated Four Years before Latest Fiscal Year	157	42
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	93	76
Financing Receivable, Revolving	39	36
Residential Real Estate [Member] | Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	13,790	9,228
Financing Receivable, Originated in Current Fiscal Year	3,714	7,459
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	8,581	1,019
Financing Receivable, Originated Two Years before Latest Fiscal Year	891	396
Financing Receivable, Originated Three Years before Latest Fiscal Year	318	201
Financing Receivable, Originated Four Years before Latest Fiscal Year	156	42
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	91	75
Financing Receivable, Revolving	39	36
Residential Real Estate [Member] | Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	0
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	0	0
Residential Real Estate [Member] | Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	20	15
Financing Receivable, Originated in Current Fiscal Year	1	9
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	13	1
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	3
Financing Receivable, Originated Three Years before Latest Fiscal Year	3	1
Financing Receivable, Originated Four Years before Latest Fiscal Year	1	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2	1
Financing Receivable, Revolving	0	0
Construction And Land Development [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	3,579	3,006
Warehouse lending [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,525	5,156
Financing Receivable, Originated in Current Fiscal Year	429	243
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	43	12
Financing Receivable, Originated Two Years before Latest Fiscal Year	140	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	4,913	4,901
Warehouse lending [Member] | Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,525	5,156
Financing Receivable, Originated in Current Fiscal Year	429	243
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	43	12
Financing Receivable, Originated Two Years before Latest Fiscal Year	140	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	4,913	4,901
Warehouse lending [Member] | Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	0
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	0	0
Warehouse lending [Member] | Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	0
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	0	0
Municipal and nonprofit [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,522	1,579
Financing Receivable, Originated in Current Fiscal Year	101	129
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	179	195
Financing Receivable, Originated Two Years before Latest Fiscal Year	189	101
Financing Receivable, Originated Three Years before Latest Fiscal Year	78	53
Financing Receivable, Originated Four Years before Latest Fiscal Year	43	219
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	932	878
Financing Receivable, Revolving	0	4
Municipal and nonprofit [Member] | Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,509	1,579
Financing Receivable, Originated in Current Fiscal Year	101	129
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	179	195
Financing Receivable, Originated Two Years before Latest Fiscal Year	189	101
Financing Receivable, Originated Three Years before Latest Fiscal Year	72	53
Financing Receivable, Originated Four Years before Latest Fiscal Year	43	219
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	925	878
Financing Receivable, Revolving	0	4
Municipal and nonprofit [Member] | Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	6	0
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	6	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	0	0
Municipal and nonprofit [Member] | Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	7	0
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	7	0
Financing Receivable, Revolving	0	0
Other, loan segment
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	177	169
Financing Receivable, Originated in Current Fiscal Year	18	16
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	12	12
Financing Receivable, Originated Two Years before Latest Fiscal Year	13	4
Financing Receivable, Originated Three Years before Latest Fiscal Year	6	4
Financing Receivable, Originated Four Years before Latest Fiscal Year	3	4
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	62	83
Financing Receivable, Revolving	63	46
Other, loan segment | Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	177	168
Financing Receivable, Originated in Current Fiscal Year	18	16
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	12	12
Financing Receivable, Originated Two Years before Latest Fiscal Year	13	4
Financing Receivable, Originated Three Years before Latest Fiscal Year	6	4
Financing Receivable, Originated Four Years before Latest Fiscal Year	3	4
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	62	82
Financing Receivable, Revolving	63	46
Other, loan segment | Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	0
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	0	0
Other, loan segment | Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	1
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	1
Financing Receivable, Revolving	0	0
Construction And Land Development Land [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	3,579	3,006
Financing Receivable, Originated in Current Fiscal Year	1,034	959
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	981	658
Financing Receivable, Originated Two Years before Latest Fiscal Year	434	395
Financing Receivable, Originated Three Years before Latest Fiscal Year	29	112
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	10
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2	0
Financing Receivable, Revolving	1,099	872
Construction And Land Development Land [Member] | Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	3,526	2,970
Financing Receivable, Originated in Current Fiscal Year	1,034	958
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	978	632
Financing Receivable, Originated Two Years before Latest Fiscal Year	385	394
Financing Receivable, Originated Three Years before Latest Fiscal Year	28	112
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	4
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2	0
Financing Receivable, Revolving	1,099	870
Construction And Land Development Land [Member] | Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	43	28
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2	22
Financing Receivable, Originated Two Years before Latest Fiscal Year	41	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	6
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	0	0
Construction And Land Development Land [Member] | Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	10	8
Financing Receivable, Originated in Current Fiscal Year	0	1
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1	4
Financing Receivable, Originated Two Years before Latest Fiscal Year	8	1
Financing Receivable, Originated Three Years before Latest Fiscal Year	1	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	0	2
Equity fund resources
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,107	3,830
Financing Receivable, Originated in Current Fiscal Year	1,617	9
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,585	2
Financing Receivable, Originated Two Years before Latest Fiscal Year	214	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	45	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	2
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	1,646	3,817
Equity fund resources | Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,107	3,830
Financing Receivable, Originated in Current Fiscal Year	1,617	9
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,585	2
Financing Receivable, Originated Two Years before Latest Fiscal Year	214	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	45	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	2
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	1,646	3,817
Equity fund resources | Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	0
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	0	0
Equity fund resources | Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	0
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	0	0
Residential - EBO
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,815	0
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	262
Financing Receivable, Originated Two Years before Latest Fiscal Year	719
Financing Receivable, Originated Three Years before Latest Fiscal Year	428
Financing Receivable, Originated Four Years before Latest Fiscal Year	167
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	239
Financing Receivable, Revolving	0
Residential - EBO | Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,815
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	262
Financing Receivable, Originated Two Years before Latest Fiscal Year	719
Financing Receivable, Originated Three Years before Latest Fiscal Year	428
Financing Receivable, Originated Four Years before Latest Fiscal Year	167
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	239
Financing Receivable, Revolving	0
Residential - EBO | Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	0
Residential - EBO | Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	0
Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	209	51
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
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	1	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
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
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	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	42	51
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	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
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
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	0
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
Financial Asset, 30 to 59 Days Past Due [Member] | Residential - EBO
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	166
Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	92	1
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
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	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
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	9	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
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	4	1
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
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
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
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
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
Financial Asset, 60 to 89 Days Past Due [Member] | Residential - EBO
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	79
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	644	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
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
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
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
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
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
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
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
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
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
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
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential - EBO
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	644
Financial Asset, Not Past Due
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	51,256	39,023
Financial Asset, Not Past Due | Tech & Innovation [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,175	1,418
Financial Asset, Not Past Due | Other commercial and industrial [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	8,181	6,465
Financial Asset, Not Past Due | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,686	1,723
Financial Asset, Not Past Due | Hotel franchise finance [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	3,593	2,534
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	5,021	3,952
Financial Asset, Not Past Due | Residential Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	13,764	9,191
Financial Asset, Not Past Due | Construction And Land Development [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	3,579	3,006
Financial Asset, Not Past Due | Warehouse lending [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	5,525	5,156
Financial Asset, Not Past Due | Municipal and nonprofit [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,522	1,579
Financial Asset, Not Past Due | Other, loan segment
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	177	169
Financial Asset, Not Past Due | Equity fund resources
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	5,107	3,830
Financial Asset, Not Past Due | Residential - EBO
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	926
Financial Asset, Past Due
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	945	52
Financial Asset, Past Due | Tech & Innovation [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, Past Due | Other commercial and industrial [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	1	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
Financial Asset, Past Due | Hotel franchise finance [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	9	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	0	0
Financial Asset, Past Due | Residential Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	46	52
Financial Asset, Past Due | Construction And Land Development [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, Past Due | Warehouse lending [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, Past Due | Municipal and nonprofit [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, Past Due | Other, loan segment
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, Past Due | Equity fund resources
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	$ 0
Financial Asset, Past Due | Residential - EBO
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 889

Loans, Leases and Allowance f_4

Loans, Leases and Allowance for Credit Losses - Loans by Risk Rating (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	$ 13,949	$ 15,115
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	16,375	3,624
Financing Receivable, Originated Two Years before Latest Fiscal Year	4,112	3,176
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,570	1,495
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,478	976
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,367	1,836
Financing Receivable, Revolving	11,350	12,853
Loans and Leases Receivable, Net of Deferred Income	52,201	39,075
Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	13,886	15,024
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	16,240	3,548
Financing Receivable, Originated Two Years before Latest Fiscal Year	4,008	2,935
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,356	1,387
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,414	950
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,327	1,803
Financing Receivable, Revolving	11,301	12,808
Loans and Leases Receivable, Net of Deferred Income	51,532	38,455
Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	27	46
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	80	54
Financing Receivable, Originated Two Years before Latest Fiscal Year	90	120
Financing Receivable, Originated Three Years before Latest Fiscal Year	79	79
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	6
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1	3
Financing Receivable, Revolving	35	23
Loans and Leases Receivable, Net of Deferred Income	312	331
Substandard [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	36	45
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	55	22
Financing Receivable, Originated Two Years before Latest Fiscal Year	14	121
Financing Receivable, Originated Three Years before Latest Fiscal Year	135	29
Financing Receivable, Originated Four Years before Latest Fiscal Year	64	20
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	39	30
Financing Receivable, Revolving	14	22
Loans and Leases Receivable, Net of Deferred Income	357	289
Tech & Innovation [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	663	792
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	535	167
Financing Receivable, Originated Two Years before Latest Fiscal Year	89	108
Financing Receivable, Originated Three Years before Latest Fiscal Year	80	6
Financing Receivable, Originated Four Years before Latest Fiscal Year	5	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1	1
Financing Receivable, Revolving	802	344
Loans and Leases Receivable, Net of Deferred Income	2,175	1,418
Tech & Innovation [Member] | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	639	763
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	510	157
Financing Receivable, Originated Two Years before Latest Fiscal Year	86	101
Financing Receivable, Originated Three Years before Latest Fiscal Year	71	6
Financing Receivable, Originated Four Years before Latest Fiscal Year	5	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1	1
Financing Receivable, Revolving	779	334
Loans and Leases Receivable, Net of Deferred Income	2,091	1,362
Tech & Innovation [Member] | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	20	26
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	17	5
Financing Receivable, Originated Two Years before Latest Fiscal Year	3	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	21	8
Loans and Leases Receivable, Net of Deferred Income	61	39
Tech & Innovation [Member] | Substandard [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	4	3
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	8	5
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	7
Financing Receivable, Originated Three Years before Latest Fiscal Year	9	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	2	2
Loans and Leases Receivable, Net of Deferred Income	23	17
Other commercial and industrial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	2,682	2,916
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,852	397
Financing Receivable, Originated Two Years before Latest Fiscal Year	284	415
Financing Receivable, Originated Three Years before Latest Fiscal Year	402	230
Financing Receivable, Originated Four Years before Latest Fiscal Year	342	81
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	252	98
Financing Receivable, Revolving	2,368	2,328
Loans and Leases Receivable, Net of Deferred Income	8,182	6,465
Other commercial and industrial [Member] | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	2,676	2,911
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,817	360
Financing Receivable, Originated Two Years before Latest Fiscal Year	259	387
Financing Receivable, Originated Three Years before Latest Fiscal Year	393	210
Financing Receivable, Originated Four Years before Latest Fiscal Year	339	80
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	251	98
Financing Receivable, Revolving	2,353	2,306
Loans and Leases Receivable, Net of Deferred Income	8,088	6,352
Other commercial and industrial [Member] | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	1	5
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	32	27
Financing Receivable, Originated Two Years before Latest Fiscal Year	20	22
Financing Receivable, Originated Three Years before Latest Fiscal Year	3	18
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	3	15
Loans and Leases Receivable, Net of Deferred Income	59	87
Other commercial and industrial [Member] | Substandard [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	5	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	3	10
Financing Receivable, Originated Two Years before Latest Fiscal Year	5	6
Financing Receivable, Originated Three Years before Latest Fiscal Year	6	2
Financing Receivable, Originated Four Years before Latest Fiscal Year	3	1
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1	0
Financing Receivable, Revolving	12	7
Loans and Leases Receivable, Net of Deferred Income	35	26
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	330	419
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	371	201
Financing Receivable, Originated Two Years before Latest Fiscal Year	185	221
Financing Receivable, Originated Three Years before Latest Fiscal Year	168	205
Financing Receivable, Originated Four Years before Latest Fiscal Year	219	286
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	370	335
Financing Receivable, Revolving	43	56
Loans and Leases Receivable, Net of Deferred Income	1,686	1,723
Commercial Real Estate Owner Occupied [Member] | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	322	417
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	359	199
Financing Receivable, Originated Two Years before Latest Fiscal Year	184	220
Financing Receivable, Originated Three Years before Latest Fiscal Year	168	190
Financing Receivable, Originated Four Years before Latest Fiscal Year	214	278
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	359	322
Financing Receivable, Revolving	32	56
Loans and Leases Receivable, Net of Deferred Income	1,638	1,682
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	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	10
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1	2
Financing Receivable, Revolving	11	0
Loans and Leases Receivable, Net of Deferred Income	14	12
Commercial Real Estate Owner Occupied [Member] | Substandard [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	8	2
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	10	2
Financing Receivable, Originated Two Years before Latest Fiscal Year	1	1
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	5
Financing Receivable, Originated Four Years before Latest Fiscal Year	5	8
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	10	11
Financing Receivable, Revolving	0	0
Loans and Leases Receivable, Net of Deferred Income	34	29
Hotel franchise finance [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	1,404	751
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	747	205
Financing Receivable, Originated Two Years before Latest Fiscal Year	80	846
Financing Receivable, Originated Three Years before Latest Fiscal Year	723	399
Financing Receivable, Originated Four Years before Latest Fiscal Year	366	146
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	164	64
Financing Receivable, Revolving	118	123
Loans and Leases Receivable, Net of Deferred Income	3,602	2,534
Hotel franchise finance [Member] | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	1,386	721
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	727	205
Financing Receivable, Originated Two Years before Latest Fiscal Year	54	659
Financing Receivable, Originated Three Years before Latest Fiscal Year	559	332
Financing Receivable, Originated Four Years before Latest Fiscal Year	321	135
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	164	64
Financing Receivable, Revolving	118	123
Loans and Leases Receivable, Net of Deferred Income	3,329	2,239
Hotel franchise finance [Member] | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	26	88
Financing Receivable, Originated Three Years before Latest Fiscal Year	51	51
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	0	0
Loans and Leases Receivable, Net of Deferred Income	77	139
Hotel franchise finance [Member] | Substandard [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	18	30
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	20	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	99
Financing Receivable, Originated Three Years before Latest Fiscal Year	113	16
Financing Receivable, Originated Four Years before Latest Fiscal Year	45	11
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	0	0
Loans and Leases Receivable, Net of Deferred Income	196	156
Other Commercial Real Estate Non owner Occupied [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	1,956	1,413
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,214	755
Financing Receivable, Originated Two Years before Latest Fiscal Year	874	687
Financing Receivable, Originated Three Years before Latest Fiscal Year	290	284
Financing Receivable, Originated Four Years before Latest Fiscal Year	176	186
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	252	301
Financing Receivable, Revolving	259	326
Loans and Leases Receivable, Net of Deferred Income	5,021	3,952
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	1,950	1,398
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,187	755
Financing Receivable, Originated Two Years before Latest Fiscal Year	874	673
Financing Receivable, Originated Three Years before Latest Fiscal Year	268	279
Financing Receivable, Originated Four Years before Latest Fiscal Year	166	186
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	233	283
Financing Receivable, Revolving	259	315
Loans and Leases Receivable, Net of Deferred Income	4,937	3,889
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	6	15
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	27	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	10
Financing Receivable, Originated Three Years before Latest Fiscal Year	19	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	1
Financing Receivable, Revolving	0	0
Loans and Leases Receivable, Net of Deferred Income	52	26
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
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	4
Financing Receivable, Originated Three Years before Latest Fiscal Year	3	5
Financing Receivable, Originated Four Years before Latest Fiscal Year	10	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	19	17
Financing Receivable, Revolving	0	11
Loans and Leases Receivable, Net of Deferred Income	32	37
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	3,715	7,468
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	8,594	1,020
Financing Receivable, Originated Two Years before Latest Fiscal Year	891	399
Financing Receivable, Originated Three Years before Latest Fiscal Year	321	202
Financing Receivable, Originated Four Years before Latest Fiscal Year	157	42
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	93	76
Financing Receivable, Revolving	39	36
Loans and Leases Receivable, Net of Deferred Income	13,810	9,243
Residential Real Estate [Member] | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	3,714	7,459
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	8,581	1,019
Financing Receivable, Originated Two Years before Latest Fiscal Year	891	396
Financing Receivable, Originated Three Years before Latest Fiscal Year	318	201
Financing Receivable, Originated Four Years before Latest Fiscal Year	156	42
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	91	75
Financing Receivable, Revolving	39	36
Loans and Leases Receivable, Net of Deferred Income	13,790	9,228
Residential Real Estate [Member] | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	0	0
Loans and Leases Receivable, Net of Deferred Income	0	0
Residential Real Estate [Member] | Substandard [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	1	9
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	13	1
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	3
Financing Receivable, Originated Three Years before Latest Fiscal Year	3	1
Financing Receivable, Originated Four Years before Latest Fiscal Year	1	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2	1
Financing Receivable, Revolving	0	0
Loans and Leases Receivable, Net of Deferred Income	20	15
Construction And Land Development Land [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	1,034	959
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	981	658
Financing Receivable, Originated Two Years before Latest Fiscal Year	434	395
Financing Receivable, Originated Three Years before Latest Fiscal Year	29	112
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	10
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2	0
Financing Receivable, Revolving	1,099	872
Loans and Leases Receivable, Net of Deferred Income	3,579	3,006
Construction And Land Development Land [Member] | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	1,034	958
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	978	632
Financing Receivable, Originated Two Years before Latest Fiscal Year	385	394
Financing Receivable, Originated Three Years before Latest Fiscal Year	28	112
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	4
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2	0
Financing Receivable, Revolving	1,099	870
Loans and Leases Receivable, Net of Deferred Income	3,526	2,970
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
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2	22
Financing Receivable, Originated Two Years before Latest Fiscal Year	41	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	6
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	0	0
Loans and Leases Receivable, Net of Deferred Income	43	28
Construction And Land Development Land [Member] | Substandard [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0	1
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1	4
Financing Receivable, Originated Two Years before Latest Fiscal Year	8	1
Financing Receivable, Originated Three Years before Latest Fiscal Year	1	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	0	2
Loans and Leases Receivable, Net of Deferred Income	10	8
Warehouse lending [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	429	243
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	43	12
Financing Receivable, Originated Two Years before Latest Fiscal Year	140	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	4,913	4,901
Loans and Leases Receivable, Net of Deferred Income	5,525	5,156
Warehouse lending [Member] | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	429	243
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	43	12
Financing Receivable, Originated Two Years before Latest Fiscal Year	140	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	4,913	4,901
Loans and Leases Receivable, Net of Deferred Income	5,525	5,156
Warehouse lending [Member] | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	0	0
Loans and Leases Receivable, Net of Deferred Income	0	0
Warehouse lending [Member] | Substandard [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	0	0
Loans and Leases Receivable, Net of Deferred Income	0	0
Municipal and nonprofit [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	101	129
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	179	195
Financing Receivable, Originated Two Years before Latest Fiscal Year	189	101
Financing Receivable, Originated Three Years before Latest Fiscal Year	78	53
Financing Receivable, Originated Four Years before Latest Fiscal Year	43	219
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	932	878
Financing Receivable, Revolving	0	4
Loans and Leases Receivable, Net of Deferred Income	1,522	1,579
Municipal and nonprofit [Member] | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	101	129
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	179	195
Financing Receivable, Originated Two Years before Latest Fiscal Year	189	101
Financing Receivable, Originated Three Years before Latest Fiscal Year	72	53
Financing Receivable, Originated Four Years before Latest Fiscal Year	43	219
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	925	878
Financing Receivable, Revolving	0	4
Loans and Leases Receivable, Net of Deferred Income	1,509	1,579
Municipal and nonprofit [Member] | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	6	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	0	0
Loans and Leases Receivable, Net of Deferred Income	6	0
Municipal and nonprofit [Member] | Substandard [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	7	0
Financing Receivable, Revolving	0	0
Loans and Leases Receivable, Net of Deferred Income	7	0
Other, loan segment
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	18	16
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	12	12
Financing Receivable, Originated Two Years before Latest Fiscal Year	13	4
Financing Receivable, Originated Three Years before Latest Fiscal Year	6	4
Financing Receivable, Originated Four Years before Latest Fiscal Year	3	4
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	62	83
Financing Receivable, Revolving	63	46
Loans and Leases Receivable, Net of Deferred Income	177	169
Other, loan segment | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	18	16
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	12	12
Financing Receivable, Originated Two Years before Latest Fiscal Year	13	4
Financing Receivable, Originated Three Years before Latest Fiscal Year	6	4
Financing Receivable, Originated Four Years before Latest Fiscal Year	3	4
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	62	82
Financing Receivable, Revolving	63	46
Loans and Leases Receivable, Net of Deferred Income	177	168
Other, loan segment | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	0	0
Loans and Leases Receivable, Net of Deferred Income	0	0
Other, loan segment | Substandard [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	1
Financing Receivable, Revolving	0	0
Loans and Leases Receivable, Net of Deferred Income	0	1
Equity fund resources
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	1,617	9
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,585	2
Financing Receivable, Originated Two Years before Latest Fiscal Year	214	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	45	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	2
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	1,646	3,817
Loans and Leases Receivable, Net of Deferred Income	5,107	3,830
Equity fund resources | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	1,617	9
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,585	2
Financing Receivable, Originated Two Years before Latest Fiscal Year	214	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	45	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	2
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	1,646	3,817
Loans and Leases Receivable, Net of Deferred Income	5,107	3,830
Equity fund resources | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	0	0
Loans and Leases Receivable, Net of Deferred Income	0	0
Equity fund resources | Substandard [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Financing Receivable, Revolving	0	0
Loans and Leases Receivable, Net of Deferred Income	0	0
Residential - EBO
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	262
Financing Receivable, Originated Two Years before Latest Fiscal Year	719
Financing Receivable, Originated Three Years before Latest Fiscal Year	428
Financing Receivable, Originated Four Years before Latest Fiscal Year	167
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	239
Financing Receivable, Revolving	0
Loans and Leases Receivable, Net of Deferred Income	1,815	$ 0
Residential - EBO | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	262
Financing Receivable, Originated Two Years before Latest Fiscal Year	719
Financing Receivable, Originated Three Years before Latest Fiscal Year	428
Financing Receivable, Originated Four Years before Latest Fiscal Year	167
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	239
Financing Receivable, Revolving	0
Loans and Leases Receivable, Net of Deferred Income	1,815
Residential - EBO | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	0
Loans and Leases Receivable, Net of Deferred Income	0
Residential - EBO | Substandard [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	0
Loans and Leases Receivable, Net of Deferred Income	$ 0

Loans, Leases and Allowance f_5

Loans, Leases and Allowance for Credit Losses Loans, Leases and Allowance for Credit Losses - Troubled Debt Restructurings (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($) SecurityLoan	Sep. 30, 2021 SecurityLoan	Sep. 30, 2022 USD ($) SecurityLoan	Sep. 30, 2021 USD ($) SecurityLoan	Dec. 31, 2021 USD ($) SecurityLoan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | SecurityLoan	0	0	0	1
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend	$ 1		$ 1		$ 0
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 14		$ 17	$ 13
Financing Receivable, Modifications, Number of Contracts | SecurityLoan	2	0	4	9
Financing Receivable, Troubled Debt Restructuring	$ 31		$ 31		21
Reserves allocated to customers whose loan terms modified in troubled debt restructurings	$ 5		$ 5		$ 0
Financing Receivable, Troubled Debt Restructured Loans, Number of Outstanding Contracts | SecurityLoan	14		14		16
COVID-19-related Loan Modifications	$ 111		$ 111
Loans in Forbearance	10		10
Financing Receivable, Troubled Debt Restructuring, Subsequent Default				$ 4
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down				$ 2
Tech & Innovation [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring	$ 3		$ 3		$ 2
Financing Receivable, Troubled Debt Restructured Loans, Number of Outstanding Contracts | SecurityLoan	1		1		2
Other commercial and industrial [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring	$ 8		$ 8		$ 6
Financing Receivable, Troubled Debt Restructured Loans, Number of Outstanding Contracts | SecurityLoan	7		7		7
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring	$ 1		$ 1		$ 1
Financing Receivable, Troubled Debt Restructured Loans, Number of Outstanding Contracts | SecurityLoan	1		1		1
Hotel franchise finance [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring	$ 10		$ 10		$ 0
Financing Receivable, Troubled Debt Restructured Loans, Number of Outstanding Contracts | SecurityLoan	1		1		0
Other Commercial Real Estate Non owner Occupied [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring	$ 8		$ 8		$ 11
Financing Receivable, Troubled Debt Restructured Loans, Number of Outstanding Contracts | SecurityLoan	3		3		5
Construction And Land Development [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring	$ 1		$ 1		$ 1
Financing Receivable, Troubled Debt Restructured Loans, Number of Outstanding Contracts | SecurityLoan	1		1		1

Loans, Leases and Allowance f_6

Loans, Leases and Allowance for Credit Losses Loans, Leases and Allowance for Credit Losses - Collateral Dependent Loans (Details) - USD ($) $ in Millions	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Loans and Leases Receivable Disclosure [Line Items]
Loans collectively evaluated for impairment	$ 51,871		$ 38,812
Financing Receivable, Individually Evaluated for Impairment	330		263
Loans and Leases Receivable, Net of Deferred Income	52,201		39,075
Loans collectively evaluated for impairment	285.3		236.4
Total loans individually evaluated for impairment	18.8		16.1
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	304.1	$ 273.2	252.5	$ 246.9	$ 232.9	$ 278.9
Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	268		227
Real Estate Collateral [Member] | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	244		214
Other Collateral [Member] | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	24		13
Tech & Innovation [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans collectively evaluated for impairment	2,152		1,401
Financing Receivable, Individually Evaluated for Impairment	23		17
Loans and Leases Receivable, Net of Deferred Income	2,175		1,418
Loans collectively evaluated for impairment	21.9		22.9
Total loans individually evaluated for impairment	3.3		2.8
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	25.2	25.4	25.7	29.2	20.5	33.4
Other commercial and industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans collectively evaluated for impairment	8,149		6,442
Financing Receivable, Individually Evaluated for Impairment	33		23
Loans and Leases Receivable, Net of Deferred Income	8,182		6,465
Loans collectively evaluated for impairment	99.6		101.1
Total loans individually evaluated for impairment	6.6		2.5
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	106.2	119.2	103.6	91.6	76.4	94.7
Other commercial and industrial [Member] | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	16		13
Other commercial and industrial [Member] | Real Estate Collateral [Member] | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0		0
Other commercial and industrial [Member] | Other Collateral [Member] | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	16		13
Commercial Real Estate Owner Occupied [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans collectively evaluated for impairment	1,655		1,699
Financing Receivable, Individually Evaluated for Impairment	31		24
Loans and Leases Receivable, Net of Deferred Income	1,686		1,723
Loans collectively evaluated for impairment	6.7		10.6
Total loans individually evaluated for impairment	0		0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	6.7	7.5	10.6	9.4	9.3	18.6
Commercial Real Estate Owner Occupied [Member] | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	24		23
Commercial Real Estate Owner Occupied [Member] | Real Estate Collateral [Member] | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	24		23
Commercial Real Estate Owner Occupied [Member] | Other Collateral [Member] | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0		0
Hotel franchise finance [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans collectively evaluated for impairment	3,406		2,378
Financing Receivable, Individually Evaluated for Impairment	196		156
Loans and Leases Receivable, Net of Deferred Income	3,602		2,534
Loans collectively evaluated for impairment	44.6		30.7
Total loans individually evaluated for impairment	6.4		10.8
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	51	33.8	41.5	49.6	49.4	43.3
Hotel franchise finance [Member] | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	182		156
Hotel franchise finance [Member] | Real Estate Collateral [Member] | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	182		156
Hotel franchise finance [Member] | Other Collateral [Member] | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0		0
Other Commercial Real Estate Non owner Occupied [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans collectively evaluated for impairment	4,991		3,917
Financing Receivable, Individually Evaluated for Impairment	30		35
Loans and Leases Receivable, Net of Deferred Income	5,021		3,952
Loans collectively evaluated for impairment	33.4		16.9
Total loans individually evaluated for impairment	0		0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	33.4	22.1	16.9	20.1	29.8	39.9
Other Commercial Real Estate Non owner Occupied [Member] | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	28		31
Other Commercial Real Estate Non owner Occupied [Member] | Real Estate Collateral [Member] | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	28		31
Other Commercial Real Estate Non owner Occupied [Member] | Other Collateral [Member] | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0		0
Residential Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans collectively evaluated for impairment	13,810		9,243
Financing Receivable, Individually Evaluated for Impairment	0		0
Loans and Leases Receivable, Net of Deferred Income	13,810		9,243
Loans collectively evaluated for impairment	25.6		12.5
Total loans individually evaluated for impairment	0		0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	25.6	18.8	12.5	6.1	8.1	0.8
Construction And Land Development [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans collectively evaluated for impairment	3,569		2,998
Financing Receivable, Individually Evaluated for Impairment	10		8
Loans and Leases Receivable, Net of Deferred Income	3,579		3,006
Loans collectively evaluated for impairment	22.4		12.5
Total loans individually evaluated for impairment	0		0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	22.4	12.2	12.5	11.5	14.1	22
Construction And Land Development [Member] | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	10		4
Construction And Land Development [Member] | Real Estate Collateral [Member] | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	10		4
Construction And Land Development [Member] | Other Collateral [Member] | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0		0
Warehouse lending [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans collectively evaluated for impairment	5,525		5,156
Financing Receivable, Individually Evaluated for Impairment	0		0
Loans and Leases Receivable, Net of Deferred Income	5,525		5,156
Loans collectively evaluated for impairment	4.4		3
Total loans individually evaluated for impairment	0		0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	4.4	3.7	3	2.6	3.2	3.4
Municipal and nonprofit [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans collectively evaluated for impairment	1,515		1,579
Financing Receivable, Individually Evaluated for Impairment	7		0
Loans and Leases Receivable, Net of Deferred Income	1,522		1,579
Loans collectively evaluated for impairment	12.7		13.7
Total loans individually evaluated for impairment	2.5		0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	15.2	13.6	13.7	15.2	15.9	15.9
Municipal and nonprofit [Member] | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	8		0
Municipal and nonprofit [Member] | Real Estate Collateral [Member] | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0		0
Municipal and nonprofit [Member] | Other Collateral [Member] | Asset Pledged as Collateral
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Net of Deferred Income	8		0
Other, loan segment
Loans and Leases Receivable Disclosure [Line Items]
Loans collectively evaluated for impairment	177		169
Financing Receivable, Individually Evaluated for Impairment	0		0
Loans and Leases Receivable, Net of Deferred Income	177		169
Loans collectively evaluated for impairment	3.1		2.9
Total loans individually evaluated for impairment	0		0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	3.1	2.9	2.9	4.4	5.1	5
Equity fund resources
Loans and Leases Receivable Disclosure [Line Items]
Loans collectively evaluated for impairment	5,107		3,830
Financing Receivable, Individually Evaluated for Impairment	0		0
Loans and Leases Receivable, Net of Deferred Income	5,107		3,830
Loans collectively evaluated for impairment	10.9		9.6
Total loans individually evaluated for impairment	0		0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	$ 10.9	$ 14	$ 9.6	$ 7.2	$ 1.1	$ 1.9

Loans, Leases and Allowance f_7

Loans, Leases and Allowance for Credit Losses - Allowances for Credit Losses (Detail) Valuation - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Valuation Allowance [Line Items]
Provision for Loan and Lease Losses	$ (29)	$ 17	$ (51.3)	$ (27.5)
Financing Receivable, Collectively Evaluated for Impairment	51,871		51,871			$ 38,812
Financing Receivable, Individually Evaluated for Impairment	330		330			263
Loans and Leases Receivable, Net of Deferred Income	52,201		52,201			39,075
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	285.3		285.3			236.4
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	18.8		18.8			16.1
Off-Balance Sheet, Credit Loss, Liability	52.1	32.1	52.1	32.1	$ 53.8	37.6	$ 31.3	$ 37
Loans and Leases Receivable, Allowance	304		304			252
Interest Receivable	263		263			198
Off-Balance Sheet, Credit Loss, Liability, Change in Method, Credit Loss Expense (Reversal)	(1.7)	0.8	14.5	(4.9)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	304.1	246.9	304.1	246.9	273.2	252.5	232.9	278.9
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	2.1	3.3	7.1	7.7
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	4	0.3	7.4	3.2
Tech & Innovation [Member]
Valuation Allowance [Line Items]
Provision for Loan and Lease Losses	(0.2)	8.6	(2.5)	(2.6)
Financing Receivable, Collectively Evaluated for Impairment	2,152		2,152			1,401
Financing Receivable, Individually Evaluated for Impairment	23		23			17
Loans and Leases Receivable, Net of Deferred Income	2,175		2,175			1,418
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	21.9		21.9			22.9
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	3.3		3.3			2.8
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	25.2	29.2	25.2	29.2	25.4	25.7	20.5	33.4
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0	0	0	2
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	0	0.1	2	0.4
Other commercial and industrial [Member]
Valuation Allowance [Line Items]
Provision for Loan and Lease Losses	14.7	18.3	(4.7)	(0.2)
Financing Receivable, Collectively Evaluated for Impairment	8,149		8,149			6,442
Financing Receivable, Individually Evaluated for Impairment	33		33			23
Loans and Leases Receivable, Net of Deferred Income	8,182		8,182			6,465
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	99.6		99.6			101.1
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	6.6		6.6			2.5
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	106.2	91.6	106.2	91.6	119.2	103.6	76.4	94.7
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	2.1	3.3	7	3.7
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	3.8	0.2	4.9	0.8
Commercial Real Estate Owner Occupied [Member]
Valuation Allowance [Line Items]
Provision for Loan and Lease Losses	(0.8)	0.1	(4)	(9.2)
Financing Receivable, Collectively Evaluated for Impairment	1,655		1,655			1,699
Financing Receivable, Individually Evaluated for Impairment	31		31			24
Loans and Leases Receivable, Net of Deferred Income	1,686		1,686			1,723
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	6.7		6.7			10.6
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0		0			0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	6.7	9.4	6.7	9.4	7.5	10.6	9.3	18.6
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0	0	0	0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	0	0	0.1	0
Hotel franchise finance [Member]
Valuation Allowance [Line Items]
Provision for Loan and Lease Losses	(17.2)	(0.2)	9.5	(6.3)
Financing Receivable, Collectively Evaluated for Impairment	3,406		3,406			2,378
Financing Receivable, Individually Evaluated for Impairment	196		196			156
Loans and Leases Receivable, Net of Deferred Income	3,602		3,602			2,534
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	44.6		44.6			30.7
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	6.4		6.4			10.8
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	51	49.6	51	49.6	33.8	41.5	49.4	43.3
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0	0	0	0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	0	0	0	0
Other Commercial Real Estate Non owner Occupied [Member]
Valuation Allowance [Line Items]
Provision for Loan and Lease Losses	(11.2)	(9.7)	(16.4)	(19.2)
Financing Receivable, Collectively Evaluated for Impairment	4,991		4,991			3,917
Financing Receivable, Individually Evaluated for Impairment	30		30			35
Loans and Leases Receivable, Net of Deferred Income	5,021		5,021			3,952
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	33.4		33.4			16.9
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0		0			0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	33.4	20.1	33.4	20.1	22.1	16.9	29.8	39.9
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0	0	0	2
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	0.1	0	0.1	1.4
Residential Real Estate [Member]
Valuation Allowance [Line Items]
Provision for Loan and Lease Losses	6.8	2	(13.1)	(5.2)
Financing Receivable, Collectively Evaluated for Impairment	13,810		13,810			9,243
Financing Receivable, Individually Evaluated for Impairment	0		0			0
Loans and Leases Receivable, Net of Deferred Income	13,810		13,810			9,243
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	25.6		25.6			12.5
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0		0			0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	25.6	6.1	25.6	6.1	18.8	12.5	8.1	0.8
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0	0	0	0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	0	0	0	0.1
Construction And Land Development [Member]
Valuation Allowance [Line Items]
Provision for Loan and Lease Losses	(10.1)	(2.6)	9.8	(10.5)
Financing Receivable, Collectively Evaluated for Impairment	3,569		3,569			2,998
Financing Receivable, Individually Evaluated for Impairment	10		10			8
Loans and Leases Receivable, Net of Deferred Income	3,579		3,579			3,006
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	22.4		22.4			12.5
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0		0			0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	22.4	11.5	22.4	11.5	12.2	12.5	14.1	22
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0	0	0	0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	0.1	0	0.1	0
Warehouse lending [Member]
Valuation Allowance [Line Items]
Provision for Loan and Lease Losses	(0.7)	(0.6)	(1.4)	(0.8)
Financing Receivable, Collectively Evaluated for Impairment	5,525		5,525			5,156
Financing Receivable, Individually Evaluated for Impairment	0		0			0
Loans and Leases Receivable, Net of Deferred Income	5,525		5,525			5,156
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	4.4		4.4			3
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0		0			0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	4.4	2.6	4.4	2.6	3.7	3	3.2	3.4
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0	0	0	0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	0	0	0	0
Municipal and nonprofit [Member]
Valuation Allowance [Line Items]
Provision for Loan and Lease Losses	(1.6)	0.7	1.5	(0.7)
Financing Receivable, Collectively Evaluated for Impairment	1,515		1,515			1,579
Financing Receivable, Individually Evaluated for Impairment	7		7			0
Loans and Leases Receivable, Net of Deferred Income	1,522		1,522			1,579
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	12.7		12.7			13.7
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	2.5		2.5			0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	15.2	15.2	15.2	15.2	13.6	13.7	15.9	15.9
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0	0	0	0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	0	0	0	0
Other, loan segment
Valuation Allowance [Line Items]
Provision for Loan and Lease Losses	0.2	(0.7)	0.1	(1.1)
Financing Receivable, Collectively Evaluated for Impairment	177		177			169
Financing Receivable, Individually Evaluated for Impairment	0		0			0
Loans and Leases Receivable, Net of Deferred Income	177		177			169
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	3.1		3.1			2.9
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0		0			0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	3.1	4.4	3.1	4.4	2.9	2.9	5.1	5
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0	0	0.1	0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	0	0	0.2	0.5
Equity fund resources
Valuation Allowance [Line Items]
Provision for Loan and Lease Losses	3.1	(6.1)	(1.3)	5.3
Financing Receivable, Collectively Evaluated for Impairment	5,107		5,107			3,830
Financing Receivable, Individually Evaluated for Impairment	0		0			0
Loans and Leases Receivable, Net of Deferred Income	5,107		5,107			3,830
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	10.9		10.9			9.6
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0		0			0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	10.9	7.2	10.9	7.2	14	9.6	$ 1.1	$ 1.9
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0	0	0	0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	0	$ 0	0	$ 0
Residential - EBO
Valuation Allowance [Line Items]
Provision for Loan and Lease Losses	0		0
Financing Receivable, Collectively Evaluated for Impairment	1,815		1,815
Financing Receivable, Individually Evaluated for Impairment	0		0
Loans and Leases Receivable, Net of Deferred Income	1,815		1,815			0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	0		0
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0		0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	0		0		$ 0	$ 0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff	0		0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery	$ 0		$ 0

Loans, Leases and Allowance f_8

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		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Sale	$ 210		$ 226
Gain (Loss) on Sale of Financing Receivable	(0.5)		(0.8)
Financing Receivable, Purchase
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Purchase	$ 2,700	$ 2,900	$ 8,200	$ 6,300

MSR Portfolio (Details)

MSR Portfolio (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Apr. 07, 2021
Servicing Assets at Fair Value [Line Items]
Servicing Asset at Fair Value, Amount	$ 1,044	$ 605	$ 1,044	$ 605	$ 826	$ 698	$ 726	$ 0
Servicing Asset at Fair Value, Additions	180	230	578.1	512.7
Servicing Asset at Fair Value, Disposals	0	(327)	(350)	(1,199)
Servicing Asset at Fair Value, Changes in Fair Value Resulting from Changes in Valuation Inputs or Changes in Assumptions	63	15	206	22
Servicing Asset at Fair Value, Other Changes in Fair Value	(25)	(39)	(88)	(107)
MSR UPB of underlying loans		23,300	24,100	88,600
Continuing Involvement with Transferred Financial Assets, Principal Amount Outstanding	62,841	47,211	62,841	47,211
Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset	48.9	41.5	140.7	102.4
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Servicing Assets								$ 1,376
MSR Loan Sales, Receivable	49		49
Mortgage servicing asset
Servicing Assets at Fair Value [Line Items]
Servicing Asset at Fair Value, Disposals		$ (329)	$ (350)	$ (1,200)
Servicing Asset at Fair Value, Other Changes in Fair Value	0
Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset	$ 0

UPB in MSR Portfolio (Details)

UPB in MSR Portfolio (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Servicing Assets at Fair Value [Line Items]
Continuing Involvement with Transferred Financial Assets, Principal Amount Outstanding	$ 62,841		$ 47,211
Servicing advances, net	$ (76)	$ (82)

Hypothetical Change in FV (Deta

Hypothetical Change in FV (Details) - USD ($) $ in Millions	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Apr. 07, 2021
Servicing Assets at Fair Value [Line Items]
Servicing Asset at Fair Value, Amount	$ 1,044	$ 826	$ 698	$ 605	$ 726	$ 0
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 50 basis point Adverse Interest Rate Change	(36)
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 50 basis point Favorable Interest Rate Change	28
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 50 basis point Discount Rate Increase	(21)
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 50 basis point Discount Rate Decrease	22
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 1 Percent Adverse Change in Prepayment Speed	(26)
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 1 Percent Adverse Change in Prepayment Speed	29
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Increase Cost of Service	(13)
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Decrease Cost of Service	$ 13

Net Loan Servicing Revenue (Det

Net Loan Servicing Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 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	$ 48.9	$ 41.5	$ 140.7	$ 102.4
Servicing Asset at Fair Value, Other Changes in Fair Value	(25)	(39)	(88)	(107)
Unrealized Gain (Loss) on Derivatives	(80.7)	(24)	(112.1)	31.2
Expense Related to Distribution or Servicing and Underwriting Fees	15.2	$ 15.6	40.7	$ 37.9
Servicing advances, net	76		$ 76		$ 82
Mortgage servicing asset
Servicing Assets at Fair Value [Line Items]
Servicing Asset at Fair Value, Additions	0
Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset	0
Servicing Asset at Fair Value, Other Changes in Fair Value	0
Cash Flows Between Transferor and Transferee, Servicing Fees	0
Gain (Loss) on Disposition of Assets for Financial Service Operations	0
Unrealized Gain (Loss) on Derivatives	0
Derivative Instruments Not Designated as Hedging Instruments, Loss	0
Expense Related to Distribution or Servicing and Underwriting Fees	0
Contractually Specified Servicing Fees, Amount	$ 0

Other Borrowings - Additional I

Other Borrowings - Additional Information (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Debt [Line Items]
FHLB advances	$ 4,000	$ 0
Other Short-term Borrowings	60	35
Short-term Debt	5,096	727
Senior Notes	316	318
Notes Payable	907	457
Long-term Debt	1,223	775
Other borrowings	6,319	1,502
Customer repurchase agreements	26	17
Federal Funds Purchased	1,010	675
Senior Notes
Debt [Line Items]
Debt Instrument, Face Amount	$ 300
Debt Instrument, Interest Rate, Stated Percentage	6.50%
Credit Linked Notes Maturing July 2059
Debt [Line Items]
Debt Instrument, Face Amount	$ 206	228
Debt Issuance Costs, Net	3	3
Credit Linked Notes Maturing April 2052
Debt [Line Items]
Debt Instrument, Face Amount	191
Debt Issuance Costs, Net	3
Credit Linked Notes Maturing June 2028
Debt [Line Items]
Debt Instrument, Face Amount	300
Debt Issuance Costs, Net	5
Credit Linked Notes Maturing December 2024
Debt [Line Items]
Debt Instrument, Face Amount	242	242
Debt Issuance Costs, Net	2	2
Federal Home Loan Bank Advances [Member]
Debt [Line Items]
Additional available credit with the entity	7,100	7,800
FRB [Member]
Debt [Line Items]
Additional available credit with the entity	5,000	$ 3,400
Unsecured Credit Facility [Member]
Debt [Line Items]
Secured borrowing credit line	4,700
Warehouse Agreement Borrowings
Debt [Line Items]
Additional available credit with the entity	$ 1,000

Qualifying Debt (Details)

Qualifying Debt (Details)	3 Months Ended		6 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($) $ / shares	Sep. 30, 2021 $ / shares	Jun. 30, 2022 $ / shares	Jun. 30, 2021 $ / shares	Sep. 30, 2022 USD ($) Trust	Dec. 31, 2021 USD ($)	Jun. 16, 2016 USD ($)
Debt Instrument [Line Items]
Common Stock, Dividends, Per Share, Cash Paid | $ / shares	$ 0.36	$ 0.35	$ 0.35	$ 0.25
Number of Statutory Business Trusts Formed or Acquired | Trust					8
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	$ 73,000,000				$ 73,000,000	$ 81,000,000
Subordinated Long-term Debt, Noncurrent	816,000,000				816,000,000	815,000,000
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				$ 225,000,000	$ 225,000,000
Debt Instrument, Interest Rate, Stated Percentage	5.25%				5.25%	5.25%
Debt Issuance Costs, Net	$ 2,000,000				$ 2,000,000	$ 2,000,000
Subordinated Debt [Member] | Subordinated Debentures Maturing June 2031
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 600,000,000				$ 600,000,000	$ 600,000,000
Debt Instrument, Interest Rate, Stated Percentage	3%				3%	3%
Debt Issuance Costs, Net	$ 7,000,000				$ 7,000,000	$ 8,000,000
Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate, at Point in Time	6.09%				6.09%	2.55%

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends, Common Stock, Cash	$ 39	$ 36.5			$ 114.2	$ 87.6
Common Stock, Dividends, Per Share, Cash Paid	$ 0.36	$ 0.35	$ 0.35	$ 0.25
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation	11,039	16,858			199,208	173,277
Treasury Stock Acquired, Average Cost Per Share	$ 77.36	$ 96.90			$ 92.40	$ 85.15
Stock Issued During Period, Shares, New Issues	600,000				1,900,000	700,000
Stock Issued During Period, Value, New Issues	$ 50				$ 157.7	$ 279
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs	$ 0.3				1	0.6
Proceeds from Issuance of Common Stock					$ 157.7	$ 279
Preferred Stock, Dividends, Per Share, Cash Paid	$ 0.27
Preferred Stock, Shares Outstanding	12,000,000				12,000,000		12,000,000
Private Placement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, New Issues						2,300,000
Shares Issued, Price Per Share		$ 91				$ 91
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense	$ 2.3	$ 3.1			$ 8.5	$ 7.7
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture	0.8				42.2
Share-based Payment Arrangement, Expense	7.1	5			21.8	17.2
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Value, New Issues	50.3				158.7
Executive Officer [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense						0.6
Retained Earnings [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends, Common Stock, Cash	$ 39	$ 36.5			$ 114.2	$ 87.6
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury Stock, Shares, Acquired	0	0			200,000	200,000
Stock Issued During Period, Shares, New Issues	600,000				1,900,000	3,000,000
Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred Stock, Shares Outstanding	12,000,000				12,000,000

Stockholders' Equity Common Sto

Stockholders' Equity Common Stock Repurchase (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs	$ 0.3				$ 1	$ 0.6
Common Stock, Dividends, Per Share, Cash Paid	$ 0.36	$ 0.35	$ 0.35	$ 0.25

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income - Summary of Changes in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (517.9)	$ 64.5	$ 15.7	$ (92.3)
Other comprehensive income before reclassifications	218.3	21.9	746.5	49.6
Amounts reclassified from accumulated other comprehensive income	0	0	(5.4)	(0.1)
Net other comprehensive loss	218.3	21.9	751.9	49.7
Ending balance	(736.2)	42.6	(736.2)	42.6
Unrealized holding gains (losses) on AFS
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(521.1)	64.8	16.7	(92.1)
Other comprehensive income before reclassifications	219.9	21.8	752.3	49
Amounts reclassified from accumulated other comprehensive income	0	0	(5.4)	(0.1)
Net other comprehensive loss	219.9	21.8	757.7	49.1
Ending balance	(741)	43	(741)	43
Accumulated Gain (Loss), Financial Liability, Fair Value Option, Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	3.5	0	(0.7)	0.5
Other comprehensive income before reclassifications	1.6	0.1	(5.8)	(0.6)
Amounts reclassified from accumulated other comprehensive income	0	0	0	0
Net other comprehensive loss	1.6	0.1	(5.8)	(0.6)
Ending balance	5.1	(0.1)	5.1	(0.1)
Supplemental Employee Retirement Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	0.3	(0.3)	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)	$ 0.3	$ (0.3)

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income - Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount reclassified from accumulated other comprehensive income	$ 0	$ 0	$ 1.8	$ 0
Amount reclassified from accumulated other comprehensive income	$ 0	$ 0	$ 5.4	$ 0.1

Derivatives and Hedging Fair Va

Derivatives and Hedging Fair Value of Derivative Contracts (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 16, 2016
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	$ 285	$ 38	$ 78
Derivative Liability, Fair Value	(237)	(96)	(135)
Derivative Asset, Not Subject to Master Netting Arrangement	30	12	19
Derivative Liability, Not Subject to Master Netting Arrangement	(44)	(4)	(6)
Derivative Asset, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election	82	22	31
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	315	50	97
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	11	(6)	(37)
Derivative Liability, Subject to Master Netting Arrangement, Asset Offset	233	28	66
Derivative Liability, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election	48	72	75
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	281	100	141
Derivative Asset, Collateral, Obligation to Return Cash, Offset	(100)	(1)	(1)
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset	(233)	(28)	(66)
Derivative Asset, Subject to Master Netting Arrangement, after Offset	52	10	12
Derivative Liability, Subject to Master Netting Arrangement, after Offset	4	68	69
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	22	14	7
Derivative Liability, Fair Value	0	(54)	(57)
Derivative Asset, Not Subject to Master Netting Arrangement	5	0	0
Derivative Liability, Not Subject to Master Netting Arrangement	(5)	0	0
Derivative Netting Adjustments, Liabilities	0	0	0
Derivative Netting Adjustments, Assets	0	0	0
Derivative Asset, Subject to Master Netting Arrangement, after Offset	22	14	7
Derivative Liability, Subject to Master Netting Arrangement, after Offset	0	54	57
Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Not Subject to Master Netting Arrangement	2	0	2
Derivative Liability, Not Subject to Master Netting Arrangement	(1)	(2)	0
Interest Rate Lock Commitments
Derivatives, Fair Value [Line Items]
Derivative Asset, Not Subject to Master Netting Arrangement	3	11	15
Derivative Liability, Not Subject to Master Netting Arrangement	(31)	(2)	(6)
Forward purchase contracts
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	3	8	1
Derivative Liability, Fair Value	(242)	(18)	(37)
Derivative Liability, Not Subject to Master Netting Arrangement	(7)	0	0
Derivative Netting Adjustments, Liabilities	0	0	0
Derivative Netting Adjustments, Assets	0	0	0
Derivative Asset, Subject to Master Netting Arrangement, after Offset	3	8	1
Derivative Liability, Subject to Master Netting Arrangement, after Offset	242	18	37
Forward sales contracts
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	360	15	69
Derivative Liability, Fair Value	(6)	(18)	(4)
Derivative Asset, Not Subject to Master Netting Arrangement	20	1	2
Derivative Netting Adjustments, Liabilities	0	0	0
Derivative Netting Adjustments, Assets	0	0	0
Derivative Asset, Subject to Master Netting Arrangement, after Offset	360	15	69
Derivative Liability, Subject to Master Netting Arrangement, after Offset	6	18	4
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	377,024	479,383	481,135
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	292	39	47
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	393	35	89
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	2,155	4	4
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	5	0	0
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	5	0	0
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	146	180	118
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	1	1	0
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	2	0	2
Not Designated as Hedging Instrument [Member] | Interest Rate Lock Commitments
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	1,918	3,033	3,576
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	31	2	6
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	3	11	15
Not Designated as Hedging Instrument [Member] | Swaption
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	0	0	50
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	0	0	0
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	0	0	0
Not Designated as Hedging Instrument [Member] | Forward purchase contracts
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	8,226	11,714	6,551
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	249	18	37
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	3	8	1
Not Designated as Hedging Instrument [Member] | Forward sales contracts
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	11,792	17,358	13,984
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	6	18	4
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	380	16	71
Not Designated as Hedging Instrument [Member] | Futures purchase contracts
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	172,333	218,054	224,325
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	0	0	0
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	0	0	0
Not Designated as Hedging Instrument [Member] | Futures sales contracts
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	180,454	229,040	232,527
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	0	0	0
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	0	0	0
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	22	14	7
Derivative Liability, Fair Value	0	(55)	(57)
Derivative, Notional Amount	483	1,383	1,547
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	483	1,383	1,547
Derivative Instruments in Hedges, Assets, at Fair Value	22	14	7
Fair Value Hedge Liabilities	$ 0	$ 55	$ 57

Derivatives and Hedging Pre-Tax

Derivatives and Hedging Pre-Tax Net Gains (Losses) on Fair Value Hedges (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Interest Income
Derivative Instruments, Gain (Loss) [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	$ 27.5	$ 7.5	$ 76.3	$ 35.4
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	(27.5)	(7.4)	(76.2)	(35.3)
Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	0	(0.5)	0	(2.4)
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	$ 0	$ 0.5	$ 0	$ 2.4

Derivatives and Hedging Additio

Derivatives and Hedging Additional Information (Detail) - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021	Jun. 16, 2016
Derivative [Line Items]
Hedged Asset, Fair Value Hedge		$ 447,000,000		$ 447,000,000		$ 1,391,000,000
Fair Value Hedge Assets, Loans	[1]	22,000,000		22,000,000		39,000,000
Derivative Liability, Fair Value		237,000,000	$ 135,000,000	237,000,000	$ 135,000,000	96,000,000
Derivative Liability, Fair Value of Collateral		5,000,000	98,000,000	5,000,000	98,000,000	67,000,000
Derivative, Gain (Loss) on Derivative, Net		99,000,000	(11,900,000)	433,900,000	(57,700,000)
Net gain on loan origination and sale activities
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net		99,000,000	(11,900,000)	433,900,000	(57,700,000)
Loan servicing fees, net
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net		(68,400,000)	(10,100,000)	(155,200,000)	26,200,000
Interest Rate Lock Commitments | Net gain on loan origination and sale activities
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net		(39,300,000)	(26,600,000)	(36,900,000)	(7,000,000)
Forward Contracts | Net gain on loan origination and sale activities
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net		145,300,000	17,100,000	487,600,000	(50,600,000)
Forward Contracts | Loan servicing fees, net
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net		(18,000,000)	(2,600,000)	(60,900,000)	10,100,000
Swaption | Loan servicing fees, net
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net		0	(1,400,000)	0	(400,000)
Future | Loan servicing fees, net
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net		2,400,000	(8,900,000)	(41,500,000)	15,700,000
Other Contract | Net gain on loan origination and sale activities
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net		1,600,000	(2,400,000)	(8,200,000)	(100,000)
Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Liability, Fair Value		0	57,000,000	0	57,000,000	54,000,000
Interest Rate Swap [Member] | Net gain on loan origination and sale activities
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net		(8,600,000)	0	(8,600,000)	0
Interest Rate Swap [Member] | Loan servicing fees, net
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net		(52,800,000)	0	(52,800,000)	0
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		$ 0	$ 57,000,000	$ 0	$ 57,000,000	$ 55,000,000
[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 $16 million and the basis adjustment related to the discontinued portion was $1 million as of December 31, 2021.

Earnings per Share (Details)

Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Basic	107.5	103.3	107	102.3
Weighted Average Number Diluted Shares Outstanding Adjustment	0.4	0.6	0.4	0.6
Diluted	107.9	103.9	107.4	102.9
Net income available to common shareholders	$ 260,800	$ 236,900	$ 754,700	$ 653,200
Earnings (loss) per share - basic	$ 2.43	$ 2.29	$ 7.06	$ 6.39
Earnings (loss) per share - diluted	$ 2.42	$ 2.28	$ 7.03	$ 6.35
Anti-dilutive stock options outstanding that were not included in computation of diluted earnings per common share			0	0

Income Taxes Additional Informa

Income Taxes Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Operating Loss Carryforwards [Line Items]
Effective Income Tax Rate Reconciliation, Percent	19.90%	21.70%	19.70%	19.70%
Deferred Income Tax Assets, Net	$ 302,000		$ 302,000		$ 21,000
Increase (Decrease) in Deferred Income Taxes			281,000
Investments in LIHTC and renewable energy	727,000		727,000		631,000
Investment-related Liabilities	431,000		431,000		361,000
Amortization of tax credit investments	16,800	$ 12,900	45,600	$ 36,600
Deferred Tax Assets, Valuation Allowance	$ 0		$ 0		$ 0

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021	Jun. 30, 2022	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Loss Contingencies [Line Items]
Letters of credit expiration period	1 year
Off-Balance Sheet, Credit Loss, Liability	$ 52.1	$ 37.6	$ 53.8	$ 32.1	$ 31.3	$ 37
Percentage of first liens initial loan to value ratio	75%
Percentage Of Commercial Real Estate Loans Occupied By Owners	18%	23%
Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member] | Credit Concentration Risk [Member]
Loss Contingencies [Line Items]
Percent of commercial real estate related loans	27%	29%
Commercial and Industrial Sector [Member] | Loans Receivable [Member] | Credit Concentration Risk [Member]
Loss Contingencies [Line Items]
Percent of commercial real estate related loans	43%	47%
Unfunded Loan Commitment [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual	$ 52	$ 38

Commitments and Contingencies_2

Commitments and Contingencies - Summary of Contractual Amounts for Unfunded Commitments and Letters of Credit (Detail) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Other Commitments [Line Items]
Total amount	$ 18,867	$ 13,901
Percentage Of Commercial Real Estate Loans Occupied By Owners	18%	23%
Commitments to extend credit [Member]
Other Commitments [Line Items]
Unsecured Loan Commitments	$ 1,326	$ 1,200
Total amount	18,229	13,396
Credit card guarantees [Member]
Other Commitments [Line Items]
Total amount	365	307
Standby letters of credit [Member]
Other Commitments [Line Items]
Total amount	273	198
Unsecured Letters Of Credit	$ 7	$ 13
Commercial Real Estate Portfolio Segment [Member] | Credit Concentration Risk [Member] | Loans Receivable [Member]
Other Commitments [Line Items]
Concentration Risk, Percentage	27%	29%

Commitments and Contingencies L

Commitments and Contingencies Lease Commitments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Lease, Cost	$ 6.2	$ 5.8	$ 18.3	$ 13.9
Lessee, operating lease, other cost	1.2	0.9	3.3	2.8
Other Commitments [Line Items]
Lease, Cost	6.2	5.8	18.3	13.9
Lessee, operating lease, other cost	$ 1.2	$ 0.9	$ 3.3	$ 2.8

Fair Value Accounting - Gains a

Fair Value Accounting - Gains and Losses from Fair Value Changes Included in Consolidated Statement of Operations (Detail) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Subordinated Debt Obligations, Fair Value Disclosure		$ 60		$ 60		$ 67
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Unrealized Gain (Loss) Arising During Period, after Tax		$ (1.6)	$ (0.1)	$ 5.8	$ (0.6)
Junior Subordinated Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Measurement Input		0.0767		0.0767		0.0261
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss)		$ 2.1	(0.2)	$ 7.7	(0.8)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)	[1]	$ 2.1	$ 0.2	$ 7.7	$ 0.8
Period of basis point spread				3.92%	2.40%
Percentage of LIBOR				3.75%	0.21%
[1]Unrealized gains/(losses) attributable to changes in the fair value of junior subordinated debt are recorded in OCI, net of tax, and totaled $1.6 million and $(0.1) million for three months ended September 30, 2022 and 2021, respectively, and $5.8 million and $(0.6) million for the nine months ended September 30, 2022, and 2021, respectively.

Fair Value Accounting - Fair Va

Fair Value Accounting - Fair Value of Assets and Liabilities (Detail) $ in Millions		3 Months Ended			9 Months Ended
		Sep. 30, 2022 USD ($) percent		Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) percent		Sep. 30, 2021 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($) percent		Jun. 30, 2021 USD ($)	Apr. 07, 2021 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity		$ 165	[1]		$ 165	[1]			$ 159	[2]
Subordinated Debt Obligations, Fair Value Disclosure		60			60				67
Servicing Asset at Fair Value, Amount		$ 1,044		$ 605	$ 1,044		$ 605	$ 826	$ 698		$ 726	$ 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				0.200
Minimum | Conditional Prepayment Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input | percent		0.084			0.084				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				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			0.172				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				20
Weighted Average | Conditional Prepayment Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input | percent		12.7			12.7				15.2
Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity		$ 165			$ 165				$ 159
Derivative Liability		281	[3]		281	[3]			100
Largest gross exposure (positive derivative NPV) to an individual counterparty		315	[3]		315	[3]			50
Loans Held-for-sale, Fair Value Disclosure		2,053			2,053				3,940
Servicing Asset at Fair Value, Amount		1,044			1,044				698
Fair Value, Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity		140			140				142
Subordinated Debt Obligations, Fair Value Disclosure		0			0				0
Derivative Liability		0	[3]		0	[3]			0
Largest gross exposure (positive derivative NPV) to an individual counterparty		0	[3]		0	[3]			0
Loans Held-for-sale, Fair Value Disclosure		0			0				0
Servicing Asset at Fair Value, Amount		0			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		25			25				17
Subordinated Debt Obligations, Fair Value Disclosure		0			0				0
Derivative Liability		250	[3]		250	[3]			98
Largest gross exposure (positive derivative NPV) to an individual counterparty		312	[3]		312	[3]			39
Loans Held-for-sale, Fair Value Disclosure		2,052			2,052				3,894
Servicing Asset at Fair Value, Amount		0			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				0
Subordinated Debt Obligations, Fair Value Disclosure		60			60				67
Derivative Liability		31	[3]		31	[3]			2
Largest gross exposure (positive derivative NPV) to an individual counterparty		3	[3]		3	[3]			11
Loans Held-for-sale, Fair Value Disclosure		1			1				46
Servicing Asset at Fair Value, Amount		1,044			1,044				698
Reported Value Measurement [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity		165			165				159
Derivative Liability		281			281				100
Largest gross exposure (positive derivative NPV) to an individual counterparty		315			315				50
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		165			165				159
Derivative Liability		281			281				100
Largest gross exposure (positive derivative NPV) to an individual counterparty		315			315				50
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		140			140				142
Derivative Liability		0			0				0
Largest gross exposure (positive derivative NPV) to an individual counterparty		0			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		25			25				17
Derivative Liability		250			250				98
Largest gross exposure (positive derivative NPV) to an individual counterparty		312			312				39
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				0
Derivative Liability		31			31				2
Largest gross exposure (positive derivative NPV) to an individual counterparty		3			3				11
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)		2.1		(0.2)	7.7		(0.8)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)	[4]	2.1		$ 0.2	7.7		$ 0.8
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		$ 60			$ 60				$ 67
[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 decreased by $22 million as of September 30, 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 in OCI, net of tax, and totaled $1.6 million and $(0.1) million for three months ended September 30, 2022 and 2021, respectively, and $5.8 million and $(0.6) million for the nine months ended September 30, 2022, and 2021, respectively.

Fair Value Accounting - Change

Fair Value Accounting - Change in Level 3 Liabilities Measured at Fair Value on Recurring Basis (Detail) $ in Millions		3 Months Ended			9 Months Ended
		Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2022 USD ($)	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		$ (1.6)	$ (0.1)		$ 5.8	$ (0.6)
Junior subordinated debt		60			60			$ 67
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		0	(4)		(38)	(5)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		1	5	$ 1	1	5	$ 1	46
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances			0	1
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases		241	3		1,121	3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales		(241)	(3)		(1,187)	(4)
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss)		0	0		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		0			(17)
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 Transfers Into Level 3			0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		(28)	9	31	(28)	9	12	9
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances			0	24
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases		5,205	8,331		16,104	14,669
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances		(5,235)	(8,357)		(16,099)	(14,681)
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss)		(28)	9		(28)	9
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		(10)	4		(42)	(3)
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 Transfers Into Level 3			0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		1,044	605	726	1,044	605	$ 826	698
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances			0	1,376
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases		180	230		578	513
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales		0	(327)		(350)	(1,199)
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss)		62	6		150	(9)
Realization of expected cash flows		(25)	(39)		(88)	(107)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		63	15		206	22
Fair Value, Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Junior subordinated debt		60			60			$ 67
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]	$ (2.1)	(0.2)		$ (7.7)	(0.8)
Debt Instrument, Measurement Input		0.0767			0.0767			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		$ 60			$ 60			$ 67
Junior Subordinated Debt [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning balance		61.8	66.5		67.4	65.9
Closing balance		$ 59.7	$ 66.7	$ 66.5	$ 59.7	$ 66.7
[1]Unrealized gains/(losses) attributable to changes in the fair value of junior subordinated debt are recorded in OCI, net of tax, and totaled $1.6 million and $(0.1) million for three months ended September 30, 2022 and 2021, respectively, and $5.8 million and $(0.6) million for the nine months ended September 30, 2022, and 2021, respectively.

Fair Value Accounting - Assets

Fair Value Accounting - Assets Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 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	$ 14	$ 11
Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets acquired through foreclosure	11	12
Collateral Dependent Loans, Net of Allowance	254	216
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
Collateral Dependent Loans, Net of Allowance	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
Collateral Dependent Loans, Net of Allowance	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	12
Collateral Dependent Loans, Net of Allowance	$ 254	$ 216
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]
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]
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]
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]
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]
Level 3 Fair Value Measurement Inputs	Loss given default	Loss given default

Fair Value Accounting - Chang_2

Fair Value Accounting - Change in Level 3 Unobservable Inputs (Detail) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022 USD ($) percent	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) percent	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) percent	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)
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 | $	$ 1	$ 5	$ 1	$ 5	$ 46	$ 1	$ 1
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | $	241	3	1,121	3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | $	(241)	(3)	(1,187)	(4)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | $	0	4	38	5
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) | $	0	0	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 | $	(28)	9	(28)	9	9	12	31
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | $	5,205	8,331	16,104	14,669
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | $		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances | $	(5,235)	(8,357)	(16,099)	(14,681)
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) | $	(28)	9	(28)	9
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | $	(10)	4	(42)	(3)
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 | $	1,044	605	1,044	605	$ 698	$ 826	$ 726
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | $	180	230	578	513
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | $	0	(327)	(350)	(1,199)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | $		0
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) | $	62	6	150	(9)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | $	63	15	206	22
Realization of expected cash flows | $	$ (25)	$ (39)	$ (88)	$ (107)
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]
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]
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	631		631		735
Option Adjusted Spread | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	375		375		600
Option Adjusted Spread | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	209		209		553
Conditional Prepayment Rate | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	0.172		0.172		0.207
Conditional Prepayment Rate | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	12.7		12.7		15.2
Conditional Prepayment Rate | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	0.084		0.084		0.099
Servicing Fee Rate | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	56.5		56.5		50
Servicing Fee Rate | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	33		33		29.5
Servicing Fee Rate | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	25		25		25
Cost to Service | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	94		94		91
Cost to Service | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	90		90		86
Cost to Service | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input	87		87		84
Servicing Fee Multiple | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Measurement Input	6.1		6.1		5.4
Servicing Fee Multiple | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Measurement Input	5.1		5.1		4.6
Servicing Fee Multiple | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Measurement Input	3.3		3.3		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		1
Pull-through Rate | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Measurement Input	88		88		90
Pull-through Rate | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Measurement Input	0.73		0.73		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	3.1		3.1		(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	2.7		2.7		(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	1.9		1.9		(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		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		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		0.200

Fair Value Accounting - Estimat

Fair Value Accounting - Estimated Fair Value of Financial Instruments (Detail) - USD ($) $ in Millions	Sep. 30, 2022		Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Repossessed Assets	$ 11		$ 12
Financial assets
Debt Securities, Held-to-maturity	1,270		1,107
Debt Securities, Available-for-sale	6,960	[1]	6,189	[2]
Investment securities - equity	165	[1]	159	[2]
Loans, net	51,897		38,823
Loans Receivable Held-for-sale, Amount	2,204		5,635
Servicing Asset	1,044		698
Accrued Investment Income Receivable	4		3
Financial liabilities
Deposits	55,589		47,612
Other borrowings	6,319		1,502
Junior subordinated debt	60		67
Fair Value, Nonrecurring [Member]
Financial liabilities
Other assets acquired through foreclosure	11		12
Fair Value, Nonrecurring [Member] | Level 1 [Member]
Financial liabilities
Other assets acquired through foreclosure	0		0
Fair Value, Nonrecurring [Member] | Level 2 [Member]
Financial liabilities
Other assets acquired through foreclosure	0		0
Fair Value, Nonrecurring [Member] | Level 3 [Member]
Financial liabilities
Other assets acquired through foreclosure	11		12
Fair Value, Nonrecurring [Member] | Reported Value Measurement [Member]
Financial assets
Debt Securities, Held-to-maturity	1,270		1,107
Loans, net	51,897		38,823
Accrued Investment Income Receivable	313		228
Financial liabilities
Deposits	55,589		47,612
Other borrowings	6,319		1,502
Junior subordinated debt	889		896
Interest Payable, Current	20		9
Fair Value, Nonrecurring [Member] | Estimate of Fair Value Measurement [Member]
Financial assets
Debt Securities, Held-to-maturity	1,084		1,146
Loans, net	50,068		39,218
Accrued Investment Income Receivable	313		228
Financial liabilities
Deposits	55,600		47,616
Other borrowings	6,217		1,518
Junior subordinated debt	815		939
Interest Payable, Current	20		9
Fair Value, Nonrecurring [Member] | Estimate of Fair Value Measurement [Member] | Level 1 [Member]
Financial assets
Debt Securities, Held-to-maturity	0		0
Loans, net	0		0
Accrued Investment Income Receivable	0		0
Financial liabilities
Deposits	0		0
Other borrowings	0		0
Junior subordinated debt	0		0
Interest Payable, Current	0		0
Fair Value, Nonrecurring [Member] | Estimate of Fair Value Measurement [Member] | Level 2 [Member]
Financial assets
Debt Securities, Held-to-maturity	1,084		1,146
Loans, net	0		0
Accrued Investment Income Receivable	313		228
Financial liabilities
Deposits	55,600		47,616
Other borrowings	6,217		1,518
Junior subordinated debt	743		858
Interest Payable, Current	20		9
Fair Value, Nonrecurring [Member] | Estimate of Fair Value Measurement [Member] | Level 3 [Member]
Financial assets
Debt Securities, Held-to-maturity	0		0
Loans, net	50,068		39,218
Accrued Investment Income Receivable	0		0
Financial liabilities
Deposits	0		0
Other borrowings	0		0
Junior subordinated debt	72		81
Interest Payable, Current	0		0
Fair Value, Recurring [Member]
Financial assets
Debt Securities, Available-for-sale	6,960		6,189
Investment securities - equity	165		159
Derivative Asset	315	[3]	50
Financial liabilities
Derivative Liability	281	[3]	100
Fair Value, Recurring [Member] | Level 1 [Member]
Financial assets
Debt Securities, Available-for-sale	25		41
Investment securities - equity	140		142
Derivative Asset	0	[3]	0
Financial liabilities
Junior subordinated debt	0		0
Derivative Liability	0	[3]	0
Fair Value, Recurring [Member] | Level 2 [Member]
Financial assets
Debt Securities, Available-for-sale	6,935		6,148
Investment securities - equity	25		17
Derivative Asset	312	[3]	39
Financial liabilities
Junior subordinated debt	0		0
Derivative Liability	250	[3]	98
Fair Value, Recurring [Member] | Level 3 [Member]
Financial assets
Debt Securities, Available-for-sale	0		0
Investment securities - equity	0		0
Derivative Asset	3	[3]	11
Financial liabilities
Junior subordinated debt	60		67
Derivative Liability	31	[3]	2
Fair Value, Recurring [Member] | Reported Value Measurement [Member]
Financial assets
Debt Securities, Available-for-sale	6,960		6,189
Investment securities - equity	165		159
Derivative Asset	315		50
Loans Receivable Held-for-sale, Amount	2,204		5,635
Servicing Asset	1,044		698
Financial liabilities
Derivative Liability	281		100
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member]
Financial assets
Debt Securities, Available-for-sale	6,960		6,189
Investment securities - equity	165		159
Derivative Asset	315		50
Loans Receivable Held-for-sale, Amount	2,205		5,654
Servicing Asset	1,044		698
Financial liabilities
Derivative Liability	281		100
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Level 1 [Member]
Financial assets
Debt Securities, Available-for-sale	25		41
Investment securities - equity	140		142
Derivative Asset	0		0
Loans Receivable Held-for-sale, Amount	0		0
Servicing Asset	0		0
Financial liabilities
Derivative Liability	0		0
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Level 2 [Member]
Financial assets
Debt Securities, Available-for-sale	6,935		6,148
Investment securities - equity	25		17
Derivative Asset	312		39
Loans Receivable Held-for-sale, Amount	2,053		3,894
Servicing Asset	0		0
Financial liabilities
Derivative Liability	250		98
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Level 3 [Member]
Financial assets
Debt Securities, Available-for-sale	0		0
Investment securities - equity	0		0
Derivative Asset	3		11
Loans Receivable Held-for-sale, Amount	152		1,760
Servicing Asset	1,044		698
Financial liabilities
Derivative Liability	$ 31		$ 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.[3]See "Note 11. Derivatives and Hedging Activities." In addition, the carrying value of loans is decreased by $22 million as of September 30, 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.

Fair Value Accounting - Additio

Fair Value Accounting - Additional Information (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2022 USD ($) percent shares		Sep. 30, 2021 USD ($)	Jun. 30, 2022 USD ($)	Jan. 25, 2022 USD ($)	Dec. 31, 2021 USD ($) percent shares		Jun. 30, 2021 USD ($)	Apr. 07, 2021 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets acquired through foreclosure	$ 11					$ 12
Goodwill					$ 36.6				$ 199.8
Common Stock, Shares, Issued | shares	111,466,865					108,981,341
Loans Held-for-sale, Fair Value Disclosure	$ 2,054					$ 3,940
Financing Receivable, 90 Days or More Past Due, Still Accruing	1					2
Fair Value, Option, Loans Held as Assets, Aggregate Difference	(45)					130
Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due, Aggregate Difference	0					0
UPB, Option, Loans Held as Assets, Current Through 89 Days	2,098					3,808
Fair Value, Option, Loans Held as Assets, Current Through 89 days, Aggregate Difference	(45)					130
UPB, Option, Loans Held as Assets, 90 Days or More Past Due	1					2
Investment securities - equity	165	[1]				159	[2]
Debt Securities, Available-for-sale	6,960	[1]				6,189	[2]
Fair Value, Option, Loans Held as Assets, Current Through 89 Days	2,053					3,938
Servicing Asset at Fair Value, Amount	$ 1,044		$ 605	$ 826		$ 698		$ 726	$ 0
Minimum | Option Adjusted Spread
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input | percent	209					553
Minimum | Conditional Prepayment Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input | percent	0.084					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					25
Minimum | Cost to Service
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input | percent	87					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	1.9					(3.7)
Minimum | Servicing Fee Multiple
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Measurement Input | percent	3.3					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	631					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	56.5					50
Maximum | Cost to Service
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input | percent	94					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	3.1					(2.9)
Maximum | Servicing Fee Multiple
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Measurement Input | percent	6.1					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	375					600
Weighted Average | Conditional Prepayment Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset, Measurement Input | percent	12.7					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	33					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	90					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	2.7					(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	5.1					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	88					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	$ 2,641					$ 926
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					69
Corporate Bond Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	391					383
Residential Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	1,228					1,508
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	1,694					1,993
Nontaxable Municipal Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	874					1,215
US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale						13
Other Security Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	70					82
CRA investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity	49					45
Preferred Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity	116					114
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans with an allowance recorded	$ 14					11
Junior Subordinated Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Period of basis point spread	3.92%		2.40%
Percentage of LIBOR	3.75%		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	$ 254					216
Other assets acquired through foreclosure	11					12
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	254					216
Other assets acquired through foreclosure	11					12
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
Other assets acquired through foreclosure	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
Other assets acquired through foreclosure	0					0
Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing Receivable Unpaid Principal Balance	2,099					3,810
Investment securities - equity	165					159
Debt Securities, Available-for-sale	6,960					6,189
Servicing Asset at Fair Value, Amount	1,044					698
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	2,641					926
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					69
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	391					383
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	1,228					1,508
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	1,694					1,993
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	874					1,215
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
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	70					82
Fair Value, Recurring [Member] | CRA investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity	49					45
Fair Value, Recurring [Member] | Preferred Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - equity	116					114
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	1,044					698
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	25					17
Debt Securities, Available-for-sale	6,935					6,148
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	2,641					926
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					69
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	391					383
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	1,228					1,508
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	1,694					1,993
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	874					1,215
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	45					54
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	25					17
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	140					142
Debt Securities, Available-for-sale	25					41
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
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	25					28
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	24					28
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	$ 116					$ 114
[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.

Segments - Operating Segment In

Segments - Operating Segment Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Operating Statistics [Line Items]
Service charges and fees	$ 6.5	$ 7.1	$ 21.1	$ 21.2
Cash, Cash Equivalents and Investment Securities	10,213		10,213			$ 8,057
Loans Receivable Held-for-sale, Amount	2,204		2,204			5,635
Loans and Leases Receivable, Net of Deferred Income	52,201		52,201			39,075
Less: Allowance for credit losses	(304)		(304)			(252)
Loans, net	51,897		51,897			38,823
Other Repossessed Assets	11		11			12
Goodwill and intangible assets, net	682		682			635
Other Assets Segment	4,158		4,158			2,821
Assets	69,165		69,165			55,983
Deposits	55,589		55,589			47,612
Other borrowings	7,208		7,208			2,398
Other Liabilities Segment	1,347		1,347			1,010
Total liabilities	64,144		64,144			51,020
Stockholders' equity	5,020.8	4,514	5,020.8	4,514	$ 4,958.8	4,962.6	$ 4,034.5	$ 3,413.5
Liabilities and Equity	69,165		69,165			55,983
Excess Funds Provided by (Used in) Segment Basis	0		0			0
Net interest income	602.1	410.4	1,576.6	1,098.2
Provision for Loan, Lease, and Other Losses	28.5	(12.3)	65	34.6
Net interest income (loss) after provision for credit losses	573.6	398.1	1,511.6	1,132.8
Noninterest Income	61.8	138.1	263.1	293.8
Non-interest expense	(305.8)	(233.8)	(823.3)	(613.6)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	329.6	302.4	951.4	813
Income tax expense (benefit)	65.6	65.5	187.1	159.8
Net income	264	236.9	764.3	653.2
Operating Segments [Member] | Commercial Segment
Operating Statistics [Line Items]
Cash, Cash Equivalents and Investment Securities	12		12			13
Loans Receivable Held-for-sale, Amount	0		0			0
Loans and Leases Receivable, Net of Deferred Income	32,060		32,060			25,092
Less: Allowance for credit losses	266		266			226
Loans, net	31,794		31,794			24,866
Other Repossessed Assets	11		11			12
Goodwill and intangible assets, net	294		294			295
Other Assets Segment	370		370			254
Assets	32,481		32,481			25,440
Deposits	30,006		30,006			30,467
Other borrowings	26		26			0
Other Liabilities Segment	105		105			233
Total liabilities	30,137		30,137			30,700
Stockholders' equity	2,802		2,802			2,588
Liabilities and Equity	32,939		32,939			33,288
Excess Funds Provided by (Used in) Segment Basis	(458)		(458)			(7,848)
Net interest income	413	304.4	1,118.3	848.8
Provision for Loan, Lease, and Other Losses	19.9	(19.3)	53.1	35.5
Net interest income (loss) after provision for credit losses	393.1	285.1	1,065.2	884.3
Noninterest Income	16.1	15.1	51	48.2
Non-interest expense	(111)	(107)	(341.4)	(309.4)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	298.2	193.2	774.8	623.1
Income tax expense (benefit)	71	46.5	184.4	149.8
Net income	227.2	146.7	590.4	473.3
Operating Segments [Member] | Consumer Related Segment
Operating Statistics [Line Items]
Cash, Cash Equivalents and Investment Securities	0		0			82
Loans Receivable Held-for-sale, Amount	2,204		2,204			5,635
Loans and Leases Receivable, Net of Deferred Income	20,141		20,141			13,983
Less: Allowance for credit losses	38		38			26
Loans, net	20,103		20,103			13,957
Other Repossessed Assets	0		0			0
Goodwill and intangible assets, net	388		388			340
Other Assets Segment	1,890		1,890			1,278
Assets	24,585		24,585			21,292
Deposits	20,957		20,957			15,363
Other borrowings	375		375			353
Other Liabilities Segment	447		447			138
Total liabilities	21,779		21,779			15,854
Stockholders' equity	1,711		1,711			1,596
Liabilities and Equity	23,490		23,490			17,450
Excess Funds Provided by (Used in) Segment Basis	(1,095)		(1,095)			(3,842)
Net interest income	235	170.3	637.7	417.8
Provision for Loan, Lease, and Other Losses	(7.6)	(5.5)	12.9	3.4
Net interest income (loss) after provision for credit losses	227.4	175.8	624.8	414.4
Noninterest Income	44.2	123.8	198	241.1
Non-interest expense	(178.4)	(123.6)	(442.5)	(294.4)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	93.2	176	380.3	361.1
Income tax expense (benefit)	22.3	42.6	90.8	87.5
Net income	70.9	133.4	289.5	273.6
Corporate & Other
Operating Statistics [Line Items]
Cash, Cash Equivalents and Investment Securities	10,201		10,201			7,962
Loans Receivable Held-for-sale, Amount	0		0			0
Loans and Leases Receivable, Net of Deferred Income	0		0			0
Less: Allowance for credit losses	0		0			0
Loans, net	0		0			0
Other Repossessed Assets	0		0			0
Goodwill and intangible assets, net	0		0			0
Other Assets Segment	1,898		1,898			1,289
Assets	12,099		12,099			9,251
Deposits	4,626		4,626			1,782
Other borrowings	6,807		6,807			2,045
Other Liabilities Segment	795		795			639
Total liabilities	12,228		12,228			4,466
Stockholders' equity	508		508			779
Liabilities and Equity	12,736		12,736			5,245
Excess Funds Provided by (Used in) Segment Basis	(637)		(637)			$ 4,006
Net interest income	(45.9)	(64.3)	(179.4)	(168.4)
Provision for Loan, Lease, and Other Losses	1	(1.5)	(1)	(2.5)
Net interest income (loss) after provision for credit losses	(46.9)	(62.8)	(178.4)	(165.9)
Noninterest Income	1.5	(0.8)	14.1	4.5
Non-interest expense	(16.4)	(3.2)	(39.4)	(9.8)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	(61.8)	(66.8)	(203.7)	(171.2)
Income tax expense (benefit)	(27.7)	(23.6)	(88.1)	(77.5)
Net income	$ (34.1)	$ (43.2)	$ (115.6)	$ (93.7)

Revenue from Contracts with Cus

Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Service charges and fees	$ 6.5	$ 7.1	$ 21.1	$ 21.2
Noninterest Income	61.8	138.1	263.1	293.8
Revenue from Contracts with Customers	9	9	34.6	27.6
Operating Segments [Member] | Commercial Segment
Disaggregation of Revenue [Line Items]
Noninterest Income	16.1	15.1	51	48.2
Operating Segments [Member] | Consumer Related Segment
Disaggregation of Revenue [Line Items]
Noninterest Income	44.2	123.8	198	241.1
Corporate & Other
Disaggregation of Revenue [Line Items]
Noninterest Income	$ 1.5	$ (0.8)	$ 14.1	$ 4.5