Cover	12 Months Ended
Cover	Dec. 31, 2025
Document Information [Line Items]
Document Type	DEF 14A
Amendment Flag	false
Entity Information [Line Items]
Entity Registrant Name	Eastern Bankshares, Inc.
Entity Central Index Key	0001810546

Pay vs Performance Disclosure - USD ($)

12 Months Ended

Dec. 31, 2025

Dec. 31, 2024

Dec. 31, 2023

Dec. 31, 2022

Dec. 31, 2021

Pay vs Performance Disclosure

Pay vs Performance Disclosure, Table

Pay Versus Performance

In accordance with rules adopted by the SEC, we provide the following disclosure regarding executive “Compensation Actually Paid” or “CAP” (as calculated in accordance with SEC rules) and certain Company performance for the fiscal years listed below. Please refer to the “Compensation Discussion and Analysis” section of this Proxy Statement for a more complete description of how executive compensation relates to Company performance and how the CHCM Committee makes its decisions.


									Value of Initial Fixed $100 Investment Based on:
Year #	SCT Total for PEO		“Compensation Actually Paid” to PEO (1)		Average SCT Total for Non-PEO NEOs (2)		Average “Compensation Actually Paid” to Non-PEO NEOs (1) (2)		Company TSR (3)		Peer Group TSR (4)		GAAP Net Income (thousands $)		Operating Net Income (thousand $) (5)
2025	$	4,432,693	$	5,074,020	$	2,736,668	$	2,993,480	$	128.18	$	152.71	$	88,219	$	317,977
2024	$	4,186,136	$	5,028,364	$	1,777,413	$	2,057,039	$	116.46	$	143.39	$	119,561	$	196,620
2023	$	4,915,097	$	3,898,615	$	1,999,339	$	1,648,743	$	93.07	$	126.67	$	232,177	$	167,274
2022	$	6,743,680	$	5,859,893	$	3,437,369	$	2,918,229	$	109.53	$	127.17	$	199,759	$	195,950
2021	$	4,208,543	$	4,189,967	$	2,380,559	$	2,321,245	$	125.55	$	136.64	$	154,665	$	160,589

(1)	Eastern’s PEO for the years reported 2021-2025 is Mr. Rivers.

(2)	Eastern’s Non-PEO NEOs for each year are as follows:

•

For 2025,

“Non-PEO

NEOs” include current NEOs, Messrs. Sheahan, Q. Miller, Rosato and Westermann.

•

For 2024,

“Non-PEO

NEOs” included NEOs, Messrs. Sheahan, Q. Miller, Rosato and Fitzgerald, the former Chief Administrative Officer, Chief Financial Officer and Treasurer, Eastern Bankshares, Inc., and Ms. Henry, General Counsel & Chief HR Officer.

•

For 2023,

“Non-PEO

NEOs” included NEOs, Messrs. Q. Miller, Fitzgerald, Westermann and Lodge, our former President and CEO of Eastern Insurance Group LLC, and Ms. Henry.

•

For 2022,

“Non-PEO

NEOs” included NEOs, Messrs. Q. Miller, Fitzgerald and Westermann, and Ms. Henry.

•

For 2021,

“Non-PEO

NEOs” included Messrs. Q. Miller and Fitzgerald, as well as Jan A. Miller, our former Vice Chair and Chief Commercial Banking Officer, and John F. Koegel, the former President and CEO of Eastern Insurance Group LLC.

(3)	Reflects the cumulative total shareholder return of Eastern Bankshares, Inc. over the five-year period. The reporting is based on a theoretical $100 invested of the last day of 2020 and valued as of the last trading day of 2021, 2022, 2023, 2024 and 2025.

(4)	Reflects the cumulative total shareholder return of the KRX over the five-year period. The reporting is based on a theoretical $100 invested on the last day of 2020 and valued as of the last trading day of 2021, 2022, 2023, 2024 and 2025.

(5)	Represents a non-GAAP financial measure. Please refer to the Company’s most recent Annual Report on Form 10-K for a reconciliation of non-GAAP financial measures.

Adjustments from Summary Compensation Table for PEO


	2025			2024			2023			2022			2021
Deduction for change in actuarial present values reported under the “Change in Pension Value and Non-qualified Deferred Compensation Earnings” column in the Summary Compensation Table	$	(764,265	)	$	(640,281	)	$	(617,294	)	$	(13,486	)	$	(86,687	)
Increase for service cost of Pension Plan and BEP	$	525,760		$	539,868		$	181,935		$	217,339		$	68,111
Deduction for prior service cost of Pension Plan and BEP	$	—		$	—		$	—		$	—		$	—
Deduction for amounts reported under the “Stock Awards” column in the Summary Compensation Table	$	(1,480,480	)		$ (1,353,380	)	$	(820,870	)		$ (4,503,726	)	$	—
Increase based on fair value of awards granted during year that remain unvested as of year-end, determined as of year-end	$	1,894,151		$	2,010,497		$	705,649		$	3,416,086		$	—
Increase/(Deduction) for change in fair value from prior year-end to current year-end of awards granted prior to year that were outstanding and unvested as of year-end	$	404,940		$	395,050		$	(400,794	)	$	—		$	—
Increase/(Deduction) for change in fair value from prior year-end to vesting date of awards granted prior year to date vested during year	$	61,221		$	(109,527	)	$	(65,108	)	$	—		$	—
Total Adjustments	$	641,327		$	842,227			$ (1,016,482	)	$	(883,787	)	$	(18,576	)


Adjustment from Summary Compensation Table for Non-PEO NEOs
	2025			2024			2023			2022			2021
Deduction for change in actuarial present values reported under the “Change in Pension Value and Non-qualified Deferred Compensation Earnings” column in the Summary Compensation Table	$	(161,983	)		$ (207,710)		$	(202,042	)	$	(26,832	)	$	(86,477	)
Increase for service cost of Pension Plan and BEP	$	93,112		$	120,688		$	89,731		$	111,932		$	27,163
Deduction for prior service cost of Pension Plan and BEP	$	—		$	—		$	—		$	—		$	—
Deduction for amounts reported under the “Stock Awards” column in the Summary Compensation Table	$	(1,361,003	)	$	(633,879	)	$	(201,781)		$	(2,502,048	)	$	—
Increase based on fair value of awards granted during year that remain unvested as of year-end, determined as of year-end	$	1,573,343		$	959,781		$	173,458		$	1,897,809		$	—
Deduction for change in fair value from prior year-end to current year-end of awards granted prior to year that were outstanding and unvested as of year-end	$	97,814		$	77,092		$	(178,134	)	$	—		$	—
Deduction for change in fair value from prior year-end to vesting date of awards granted prior year to date vested during year	$	15,529		$	(36,346	)	$	(31,829	)	$	—		$	—
Total Adjustments	$	256,812		$	279,626		$	(350,597	)	$	(519,139	)	$	(59,314	)

Named Executive Officers, Footnote

(2)	Eastern’s Non-PEO NEOs for each year are as follows:

•

For 2025,

“Non-PEO

NEOs” include current NEOs, Messrs. Sheahan, Q. Miller, Rosato and Westermann.

•

For 2024,

“Non-PEO

•

For 2023,

“Non-PEO

NEOs” included NEOs, Messrs. Q. Miller, Fitzgerald, Westermann and Lodge, our former President and CEO of Eastern Insurance Group LLC, and Ms. Henry.

•

For 2022,

“Non-PEO

NEOs” included NEOs, Messrs. Q. Miller, Fitzgerald and Westermann, and Ms. Henry.

•

For 2021,

“Non-PEO

Peer Group Issuers, Footnote

(4)	Reflects the cumulative total shareholder return of the KRX over the five-year period. The reporting is based on a theoretical $100 invested on the last day of 2020 and valued as of the last trading day of 2021, 2022, 2023, 2024 and 2025.

PEO Total Compensation Amount

$ 4,432,693

$ 4,186,136

$ 4,915,097

$ 6,743,680

$ 4,208,543

PEO Actually Paid Compensation Amount

$ 5,074,020

5,028,364

3,898,615

5,859,893

4,189,967

Adjustment To PEO Compensation, Footnote

Adjustments from Summary Compensation Table for PEO


	2025			2024			2023			2022			2021
Deduction for change in actuarial present values reported under the “Change in Pension Value and Non-qualified Deferred Compensation Earnings” column in the Summary Compensation Table	$	(764,265	)	$	(640,281	)	$	(617,294	)	$	(13,486	)	$	(86,687	)
Increase for service cost of Pension Plan and BEP	$	525,760		$	539,868		$	181,935		$	217,339		$	68,111
Deduction for prior service cost of Pension Plan and BEP	$	—		$	—		$	—		$	—		$	—
Deduction for amounts reported under the “Stock Awards” column in the Summary Compensation Table	$	(1,480,480	)		$ (1,353,380	)	$	(820,870	)		$ (4,503,726	)	$	—
Increase based on fair value of awards granted during year that remain unvested as of year-end, determined as of year-end	$	1,894,151		$	2,010,497		$	705,649		$	3,416,086		$	—
Increase/(Deduction) for change in fair value from prior year-end to current year-end of awards granted prior to year that were outstanding and unvested as of year-end	$	404,940		$	395,050		$	(400,794	)	$	—		$	—
Increase/(Deduction) for change in fair value from prior year-end to vesting date of awards granted prior year to date vested during year	$	61,221		$	(109,527	)	$	(65,108	)	$	—		$	—
Total Adjustments	$	641,327		$	842,227			$ (1,016,482	)	$	(883,787	)	$	(18,576	)

Non-PEO NEO Average Total Compensation Amount

$ 2,736,668

1,777,413

1,999,339

3,437,369

2,380,559

Non-PEO NEO Average Compensation Actually Paid Amount

$ 2,993,480

2,057,039

1,648,743

2,918,229

2,321,245

Adjustment to Non-PEO NEO Compensation Footnote


Adjustment from Summary Compensation Table for Non-PEO NEOs
	2025			2024			2023			2022			2021
Deduction for change in actuarial present values reported under the “Change in Pension Value and Non-qualified Deferred Compensation Earnings” column in the Summary Compensation Table	$	(161,983	)		$ (207,710)		$	(202,042	)	$	(26,832	)	$	(86,477	)
Increase for service cost of Pension Plan and BEP	$	93,112		$	120,688		$	89,731		$	111,932		$	27,163
Deduction for prior service cost of Pension Plan and BEP	$	—		$	—		$	—		$	—		$	—
Deduction for amounts reported under the “Stock Awards” column in the Summary Compensation Table	$	(1,361,003	)	$	(633,879	)	$	(201,781)		$	(2,502,048	)	$	—
Increase based on fair value of awards granted during year that remain unvested as of year-end, determined as of year-end	$	1,573,343		$	959,781		$	173,458		$	1,897,809		$	—
Deduction for change in fair value from prior year-end to current year-end of awards granted prior to year that were outstanding and unvested as of year-end	$	97,814		$	77,092		$	(178,134	)	$	—		$	—
Deduction for change in fair value from prior year-end to vesting date of awards granted prior year to date vested during year	$	15,529		$	(36,346	)	$	(31,829	)	$	—		$	—
Total Adjustments	$	256,812		$	279,626		$	(350,597	)	$	(519,139	)	$	(59,314	)

Compensation Actually Paid vs. Total Shareholder Return

Compensation Actually Paid vs. Net Income

Compensation Actually Paid vs. GAAP Net Income

Compensation Actually Paid vs. Company Selected Measure

Compensation Actually Paid vs. Operating Net Income

Total Shareholder Return Vs Peer Group

Compensation Actually Paid vs. Total Shareholder Return

Tabular List, Table

Most Important Performance Measures

In our assessment, the most important performance measures used to link Compensation Actually

Paid

to Company performance are listed in the table below, not ranked in order of importance.

Net Income

Operating Net Income

Total Shareholder Return

Total Shareholder Return Amount

$ 128.18

116.46

93.07

109.53

125.55

Peer Group Total Shareholder Return Amount

152.71

143.39

126.67

127.17

136.64

Net Income (Loss)

88,219,000

119,561,000

232,177,000

199,759,000

154,665,000

Adjustment to Compensation, Amount

$ 317,977,000

196,620,000

167,274,000

195,950,000

160,589,000

Measure:: 1

Pay vs Performance Disclosure

Name

Net Income

Measure:: 2

Pay vs Performance Disclosure

Name

Operating Net Income

Measure:: 3

Pay vs Performance Disclosure

Name

Total Shareholder Return

PEO | Equity Awards Adjustments

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

$ 641,327

842,227

(1,016,482)

(883,787)

(18,576)

PEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

(1,480,480)

(1,353,380)

(820,870)

(4,503,726)

PEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

1,894,151

2,010,497

705,649

3,416,086

PEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

404,940

395,050

(400,794)

PEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

61,221

(109,527)

(65,108)

PEO | Deduction for change in actuarial present values reported under the Change in Pension Value and Nonqualified Deferred Compensation Earnings column in the Summary Compensation [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

(764,265)

(640,281)

(617,294)

(13,486)

(86,687)

PEO | Increase for service cost of Pension Plan and BEP [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

525,760

539,868

181,935

217,339

68,111

PEO | Deduction for prior service cost of Pension Plan and BEP [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

Non-PEO NEO | Equity Awards Adjustments

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

256,812

279,626

(350,597)

(519,139)

(59,314)

Non-PEO NEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

(1,361,003)

(633,879)

(201,781)

(2,502,048)

Non-PEO NEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

1,573,343

959,781

173,458

1,897,809

Non-PEO NEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

97,814

77,092

(178,134)

Non-PEO NEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

15,529

(36,346)

(31,829)

Non-PEO NEO | Deduction for change in actuarial present values reported under the Change in Pension Value and Nonqualified Deferred Compensation Earnings column in the Summary Compensation [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

(161,983)

(207,710)

(202,042)

(26,832)

(86,477)

Non-PEO NEO | Increase for service cost of Pension Plan and BEP [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

93,112

120,688

89,731

111,932

27,163

Non-PEO NEO | Deduction for prior service cost of Pension Plan and BEP [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

$ 0

Award Timing Disclosure	12 Months Ended
Award Timing Disclosure	Dec. 31, 2025
Award Timing Disclosures [Line Items]
Award Timing MNPI Disclosure	Policy for Granting Certain Option Awards Although the Company has not historically issued option awards to employees as part of its equity compensation program, the Company maintains an Employee Equity Award Grant Policy (the “Equity Policy”) that sets forth guidelines for the timing of any option grants that could be made by the CHCM Committee in the future in order to effectively incentivize future employees. The Equity Policy provides that the Company will not grant stock options in anticipation of the release of material non-public information that is likely to result in changes to the price of Eastern’s common stock, including (i) during “blackout” periods or outside of a prescribed trading window established in connection with the public release of the Company’s earnings information under the Company’s Insider Trading Policy, or (ii) at any time during the four business day-period prior to, or one business day following, the filing of the Company’s periodic reports or the filing or furnishing of a Form 8-K that discloses material non-public information.
Award Timing Method	Although the Company has not historically issued option awards to employees as part of its equity compensation program, the Company maintains an Employee Equity Award Grant Policy (the “Equity Policy”) that sets forth guidelines for the timing of any option grants that could be made by the CHCM Committee in the future in order to effectively incentivize future employees.
Award Timing MNPI Considered	false
Award Timing, How MNPI Considered	The Equity Policy provides that the Company will not grant stock options in anticipation of the release of material non-public information that is likely to result in changes to the price of Eastern’s common stock, including (i) during “blackout” periods or outside of a prescribed trading window established in connection with the public release of the Company’s earnings information under the Company’s Insider Trading Policy, or (ii) at any time during the four business day-period prior to, or one business day following, the filing of the Company’s periodic reports or the filing or furnishing of a Form 8-K that discloses material non-public information.
MNPI Disclosure Timed for Compensation Value	false