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Retirement Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2021
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures
The following table summarizes the changes in the benefit obligation, fair value of plan assets, and funded status of the defined benefit pension and postretirement benefit plans at December 31:
  
Pension PlanSERPOPEB
(In thousands)202120202021202020212020
Change in benefit obligation:
Beginning balance$266,414 $241,404 $2,046 $1,935 $1,998 $2,399 
Interest cost4,663 6,511 30 46 19 46 
Actuarial (gain) loss(11,131)27,376 (77)194 32 (307)
Benefits paid(9,683)(8,877)(126)(129)(145)(140)
Ending balance250,263 266,414 1,873 2,046 1,904 1,998 
Change in plan assets:
Beginning balance266,268 239,621 — — — — 
Actual return on plan assets15,261 35,524 — — — — 
Employer contributions— — 126 129 145 140 
Benefits paid(9,683)(8,877)(126)(129)(145)(140)
Ending balance271,846 266,268 — — — — 
Funded status (1)
$21,583 $(146)$(1,873)$(2,046)$(1,904)$(1,998)
(1)The overfunded (underfunded) status of each plan is respectively included in accrued interest receivable and other assets or accrued expenses and other liabilities on the accompanying Consolidated Balance Sheets, as applicable.
The following table sets forth by level within the fair value hierarchy the pension plan's assets at fair value:
At December 31,
  
20212020
(In thousands)Level 1Level 2Level 3TotalLevel 1Level 2Level 3Total
Common collective trusts— 230,923 — 230,923 — 225,762 — 225,762 
Registered investment companies$39,082 $— $— $39,082 $39,645 $— $— $39,645 
Cash and cash equivalents1,841 — — 1,841 861 — — 861 
Total pension plan assets$40,923 $230,923 $— $271,846 $40,506 $225,762 $— $266,268 
Schedule of Assumptions Used The following table summarizes the weighted-average assumptions used to determine the benefit obligation at December 31:
  
Pension PlanSERPOPEB
  
202120202021202020212020
Discount rate2.65 %2.29 %2.45 %1.91 %1.99 %1.40 %
Assumed healthcare cost trend raten/an/an/an/a6.25 %6.50 %
The following table summarizes the weighted-average assumptions used to determine net periodic benefit (income) cost for the years ended December 31:
  
Pension PlanSERPOPEB
  
202120202019202120202019202120202019
Discount rate2.29 %3.07 %4.12 %1.91 %2.82 %3.95 %1.40 %2.50 %3.69 %
Expected long-term rate of return on
plan assets		5.50 %5.75 %6.00 %n/an/an/an/an/an/a
Assumed healthcare cost trend rate (1)
n/an/an/an/an/an/a6.50 %6.50 %6.50 %
(1)The assumed healthcare cost trend rate used to measure the expected cost of benefits covered by the OPEB for 2022 is 6.25%. The rate to which the healthcare cost trend rate is assumed to decline (ultimate trend rate) along with the year that the ultimate trend rate will be reached is 4.40% in 2030.
Schedule of Net Periodic Benefit Cost Not yet Recognized
The following table summarizes the amounts recorded in accumulated other comprehensive (loss) income that have not yet been recognized in net periodic benefit (income) cost at December 31:
  
Pension PlanSERPOPEB
(In thousands)202120202021202020212020
Net actuarial loss (gain)$41,792 $57,902 $658 $773 $(620)$(690)
Deferred tax benefit (expense)8,636 12,881 136 172 (128)(153)
Net amount recorded in (AOCL) AOCI$33,156 $45,021 $522 $601 $(492)$(537)
Summary of Net Periodic Benefit Cost
The following table summarizes the components of net periodic benefit (income) cost for the years ended December 31:
Pension PlanSERPOPEB
(In thousands)202120202019202120202019202120202019
Interest cost4,663 6,511 7,941 30 46 65 19 46 85 
Expected return on plan assets(14,385)(13,522)(11,436)— — — — — — 
Amortization of actuarial (gain) loss4,102 4,027 5,705 38 23 14 (38)(74)(13)
Net periodic benefit (income) cost (1)
$(5,620)$(2,984)$2,210 $68 $69 $79 $(19)$(28)$72 
(1)Net periodic benefit (income) cost is included in other non-interest expense on the accompanying Consolidated Statements of Income.
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss)
The following table summarizes amounts recognized in other comprehensive (loss) income, including reclassification adjustments, for the years ended December 31:
Pension PlanSERPOPEB
(In thousands)202120202019202120202019202120202019
Net actuarial (gain) loss$(12,008)$5,375 $(2,263)$(77)$194 $164 $33 $(307)$(103)
Amounts reclassified from
(AOCL) AOCI		(4,102)(4,027)(5,705)(38)(23)(14)38 74 13 
Total (gain) loss recognized in
(OCL) OCI		$(16,110)$1,348 $(7,968)$(115)$171 $150 $71 $(233)$(90)
Schedule of Expected Benefit Payments At December 31, 2021, the expected future benefit payments for the defined benefit pension and postretirement benefits plans are as follows:
(In thousands)Pension PlanSERPOPEB
2022$9,969 $116 $270 
202310,345 117 247 
202410,787 128 224 
202511,207 126 201 
202611,587 124 179 
Thereafter62,419 581 609 
Schedule of Multiemployer Plans The following table summarizes information related to Webster Bank's participation in the multi-employer plan:
(Dollars in thousands)Contributions
Years Ended December 31,		Funded Status
At December 31,
Plan NameEmployer Identification NumberPlan NumberSurcharge Imposed20212020201920212020
Pentegra Defined Benefit Plan
for Financial Institutions		13-5645888333No$692$998$863At least 80%At least 80%