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Share-Based Compensation - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended 13 Months Ended 16 Months Ended
Nov. 29, 2021
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Dec. 31, 2022
Mar. 31, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Share-based compensation arrangement by share-based payment award, reduction of shares available to be issued upon exercise of stock options with each additional restricted stock grant (in shares) 3          
Share-based compensation arrangement by share-based payment award, equity instruments other than options, vested in period, fair value   $ 4,900        
Share-based payment arrangement, noncash expense   $ 3,044 $ 1,623      
Restricted Stock Units (RSUs)            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period (in shares)   318,577 978,364      
Share-based compensation arrangement by share-based payment award, equity instruments other than options, vested in period (in shares)   230,768 0      
Restricted Stock            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period (in shares)   0 0      
Share-based compensation arrangement by share-based payment award, equity instruments other than options, vested in period (in shares)   0 0      
Performance Shares            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Share-based compensation arrangement by share-based payment award, award vesting period   3 years        
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period (in shares)   108,984 533,676      
Share-based compensation arrangement by share-based payment award, equity instruments other than options, vested in period (in shares)   0 0      
Eastern Bankshares, Inc. 2021 Equity Incentive Plan            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Share-based compensation arrangement by share-based payment award, number of shares authorized (in shares) 26,146,141          
Share-based compensation arrangement by share-based payment award, options, grants in period, gross (in shares)         0 0
Share-based compensation arrangement by share-based payment award, equity instruments other than options, vested in period (in shares)     0      
Share-based payment arrangement, noncash expense   $ 3,000 $ 1,600      
Share-based payment arrangement, expense, tax benefit   800 $ 400      
Share-based payment arrangement, nonvested award, excluding option, cost not yet recognized, amount   $ 37,600   $ 44,000 $ 44,000 $ 37,600
Share-based payment arrangement, nonvested award, cost not yet recognized, period for recognition   3 years   4 years 1 month 6 days    
Eastern Bankshares, Inc. 2021 Equity Incentive Plan | Restricted Stock Units (RSUs)            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Share-based compensation arrangement by share-based payment award, number of shares authorized (in shares) 7,470,326          
Share-based compensation arrangement by share-based payment award, award vesting period   3 years        
Share-based compensation arrangement by share-based payment award, number of shares available for grant (in shares)   4,874,695   5,302,256 5,302,256 4,874,695
Share-based compensation arrangement by share-based payment award, equity instruments other than options, vested in period (in shares)   230,768,000,000     0  
Eastern Bankshares, Inc. 2021 Equity Incentive Plan | Restricted Stock Units (RSUs) | Minimum            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Share-based compensation arrangement by share-based payment award, award vesting period     3 years      
Eastern Bankshares, Inc. 2021 Equity Incentive Plan | Restricted Stock Units (RSUs) | Maximum            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Share-based compensation arrangement by share-based payment award, award vesting period     5 years      
Eastern Bankshares, Inc. 2021 Equity Incentive Plan | Share-based Payment Arrangement, Option            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Share-based compensation arrangement by share-based payment award, number of shares authorized (in shares) 18,675,815          
Share-based compensation arrangement by share-based payment award, expiration period 10 years          
Share-based compensation arrangement by share-based payment award, number of shares available for grant (in shares)   18,675,815   18,675,815 18,675,815 18,675,815
Eastern Bankshares, Inc. 2021 Equity Incentive Plan | Restricted Stock            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Share-based compensation arrangement by share-based payment award, award vesting period 5 years          
Eastern Bankshares, Inc. 2021 Equity Incentive Plan | Performance Shares            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Share-based compensation arrangement by share-based payment award, award vesting period   3 years        
Share-based compensation arrangement by share-based payment award, equity instruments other than options, vested in period (in shares)         0 0