XML 86 R70.htm IDEA: XBRL DOCUMENT v3.25.0.1

Business Developments - Summary of Supplemental Pro Forma Information Adjustments (Details) - Sterling $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($)
Business Acquisition [Line Items]
Total merger-related expenses	$ 246,461
Compensation and benefits
Business Acquisition [Line Items]
Total merger-related expenses	79,001
Occupancy
Business Acquisition [Line Items]
Total merger-related expenses	36,586
Technology and equipment
Business Acquisition [Line Items]
Total merger-related expenses	24,688
Marketing
Business Acquisition [Line Items]
Total merger-related expenses	73,070
Professional and outside services
Business Acquisition [Line Items]
Total merger-related expenses	416
Other expense
Business Acquisition [Line Items]
Total merger-related expenses	$ 32,700

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479907/805-20-50-5

+ Details

Name:	us-gaap_BusinessAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479405/805-10-25-23

+ Details

Name:	us-gaap_BusinessCombinationAcquisitionRelatedCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=wbs_SterlingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=wbs_LaborAndRelatedExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=wbs_OccupancyNetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=wbs_EquipmentExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=wbs_MarketingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=wbs_ProfessionalFeesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=wbs_OtherNoninterestExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: