XML 150 R134.htm IDEA: XBRL DOCUMENT v3.25.0.1

Fair Value Measurements - Summary of Unobservable Inputs (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Fair Value, Option, Quantitative Disclosures [Line Items]
Cash payment for obligation	$ 4,600
Re-sign broker dealers
Fair Value, Option, Quantitative Disclosures [Line Items]
Contingent consideration		$ 182	$ 4,232
Re-sign broker dealers | Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Contingent consideration		207	4,826
Deposit program growth
Fair Value, Option, Quantitative Disclosures [Line Items]
Contingent consideration		11,568	11,568
Deposit program growth | Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Contingent consideration		$ 12,500	$ 12,500
Probability of Achievement | Re-sign broker dealers
Fair Value, Option, Quantitative Disclosures [Line Items]
Measurement input		0.990	0.990
Probability of Achievement | Deposit program growth
Fair Value, Option, Quantitative Disclosures [Line Items]
Measurement input		1.000	1.000
Payment Term (in years) | Re-sign broker dealers
Fair Value, Option, Quantitative Disclosures [Line Items]
Payment Term (in years)		10 months 17 days	1 year 10 months 17 days
Payment Term (in years) | Deposit program growth
Fair Value, Option, Quantitative Disclosures [Line Items]
Payment Term (in years)		6 months	1 year
Discount Rate | Re-sign broker dealers
Fair Value, Option, Quantitative Disclosures [Line Items]
Measurement input		0.0640	0.0640
Discount Rate | Deposit program growth
Fair Value, Option, Quantitative Disclosures [Line Items]
Measurement input		0.0640	0.0640

X

- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 805
-SubTopic 30
-Name Accounting Standards Codification
-Section 35
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479613/805-30-35-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479581/805-30-50-1

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479668/805-30-25-6

+ Details

Name:	us-gaap_BusinessCombinationContingentConsiderationLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 30
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-30

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 31
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-31

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-32

+ Details

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

X

- Definition

Cash Payment For Contingent Consideration Obligation

+ References

No definition available.

+ Details

Name:	wbs_CashPaymentForContingentConsiderationObligation
Namespace Prefix:	wbs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Contingent Consideration, Measurement Input

+ References

No definition available.

+ Details

Name:	wbs_ContingentConsiderationMeasurementInput
Namespace Prefix:	wbs_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Contingent Consideration, Payment Term

+ References

No definition available.

+ Details

Name:	wbs_ContingentConsiderationPaymentTerm
Namespace Prefix:	wbs_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	wbs_AgreementAxis=wbs_ReSignBrokerDealersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	wbs_AgreementAxis=wbs_DepositProgramGrowthMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MeasurementInputTypeAxis=wbs_MeasurementInputProbabilityOfAchievementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputExpectedTermMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputDiscountRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: