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Parent Company Financial Information - Schedule of Parent Company Information Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Operating activities: |  |  |
Net income | $ 768,707 | $ 867,840 | $ 644,283
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Common stock contribution to charitable foundation | 0 | 0 | 10,500
Other, net | (15,998) | 2,760 | 4,131
Net cash provided by operating activities | 1,404,300 | 978,649 | 1,335,952
Investing activities: |  |  |
Alternative investments (capital call), net of returns of capital | (160,062) | (27,430) | (24,887)
Proceeds from sales of alternative investments | 19,588 | 0 | 0
Net cash (used in) provided by investing activities | (3,869,260) | (2,595,752) | (7,186,338)
Financing activities: |  |  |
Dividends paid to common stockholders | (274,545) | (278,155) | (247,767)
Dividends paid to preferred stockholders | (16,650) | (16,650) | (13,725)
Exercise of stock options | 254 | 1,723 | 703
Common stock repurchase program | (65,403) | (107,984) | (322,103)
Common shares acquired related to stock compensation plan activity | (17,215) | (16,278) | (23,655)
Net cash (used in) financing activities | 2,823,599 | 2,492,955 | 6,228,759
Net increase (decrease) in cash and cash equivalents | 358,639 | 875,852 | 378,373
Cash and cash equivalents, beginning of period | 1,715,795 | 839,943 | 461,570
Cash and cash equivalents, at end of period | 2,074,434 | 1,715,795 | 839,943
Parent Company |  |  |
Operating activities: |  |  |
Net income | 768,707 | 867,840 | 644,283
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Equity in undistributed earnings of subsidiaries | (196,543) | (310,939) | (233,191)
Common stock contribution to charitable foundation | 0 | 0 | 10,500
Other, net | (8,711) | (8,312) | (2,853)
Net cash provided by operating activities | 563,453 | 548,589 | 418,739
Investing activities: |  |  |
Alternative investments (capital call), net of returns of capital | (17,589) | (13,070) | (16,292)
Proceeds from sales of alternative investments | 9,657 | 0 | 0
Net cash received in business combination | 0 | 0 | 193,238
Net cash (used in) provided by investing activities | (7,932) | (13,070) | 176,946
Financing activities: |  |  |
Repayment of long-term debt | (132,550) | (16,752) | 0
Dividends paid to common stockholders | (274,545) | (278,155) | (247,767)
Dividends paid to preferred stockholders | (16,650) | (16,650) | (13,725)
Exercise of stock options | 254 | 1,723 | 703
Common stock repurchase program | (65,403) | (107,984) | (322,103)
Common shares acquired related to stock compensation plan activity | (17,215) | (16,278) | (23,655)
Net cash (used in) financing activities | (506,109) | (434,096) | (606,547)
Net increase (decrease) in cash and cash equivalents | 49,412 | 101,423 | (10,862)
Cash and cash equivalents, beginning of period | 406,754 | 305,331 | 316,193
Cash and cash equivalents, at end of period | $ 456,166 | $ 406,754 | $ 305,331

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

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- Definition Stock Issued, Charitable Contribution + References No definition available. + Details
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Namespace Prefix: | wbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=srt_ParentCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |