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Pension and Other Postretirement Benefit Plans (Details) | 12 Months Ended
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Dec. 31, 2020 USD ($) plan | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Trust for Benefit of Employees [Member] |  |  |
Full Time Employment, Years of Service | 1 year |  |
Employer Contributions to the 401(k) and Profit Sharing Plans Funded By the Employee Benefit Trust | $ 2,600,000 | $ 3,400,000 | $ 3,600,000
Directors' Plan [Member] |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer | 144,000 | 144,000 |
Deferred Compensation Plan, Amounts Held in Rabbi Trust | 4,200,000 | 4,300,000 |
Defined Benefit Plan, Annual Retirement Benefit | $ 48,000 |  |
Defined Benefit Contributions, Months of Benefit Used in Lump Sum Payment in the Event of Termination | 10 years |  |
2021 | $ 288,000 |  |
Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer | $ 95,000 | $ 76,000 |
Number of Unfunded Postretirement Benefit Plans | plan | 2 |  |
Full Time Employment, Years of Service | 5 years |  |
Cost Sharing Arrangement, Medical Benefits Percentage | 50.00% |  |
Medical Premiums, Required Percentage to Be Paid By Spouses of Future Retirees | 100.00% |  |
2021 | $ 255,000 |  |
Retirement Plan [Member] |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 4.75% | 5.25% | 7.00%
2021 | $ 1,386,000 |  |
Retirement Plan [Member] | Savings Bank [Member] |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | 0 |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer | $ 0 | $ 0 | $ 0
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 4.75% |  |
Retirement Plan [Member] | Minimum [Member] |  |  |
Defined Benefit Plan, Benefit Service Period | 3 years |  |
Retirement Plan [Member] | Minimum [Member] | Defined Benefit Plan, Equity Securities [Member] | Savings Bank [Member] |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 8.00% |  |
Retirement Plan [Member] | Minimum [Member] | Fixed Income Securities [Member] | Savings Bank [Member] |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 3.00% |  |
Retirement Plan [Member] | Maximum [Member] |  |  |
Defined Benefit Plan, Benefit Service Period | 10 years |  |
Retirement Plan [Member] | Maximum [Member] | Defined Benefit Plan, Equity Securities [Member] | Savings Bank [Member] |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 10.00% |  |
Retirement Plan [Member] | Maximum [Member] | Fixed Income Securities [Member] | Savings Bank [Member] |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 5.00% |  |
Defined Contribution Retirement Plan ("DCRP") [Member] | Savings Bank [Member] |  |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 4.00% |  |
Non-qualified Deferred Compensation Plan [Member] |  |  |
Defined Contribution Plan, Annual Employer Matching of Employees Contribution, Percent | 50.00% |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 5.00% |  |
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage | 20.00% |  |
Defined Contribution Plan, Employer's Matching Contribution, Vesting Percentage, Upon Change of Control | 100.00% |  |
Defined Contribution Plan, Cost | $ 500,000 | 500,000 | 500,000
Defined Contribution Plan, Service Period Requirement | 1 year |  |
Defined Contribution Plan, Vesting Period | 5 years |  |
Deferred Compensation Plan, Amounts Held in Rabbi Trust | $ 16,600,000 | 14,400,000 |
The 401K Plan [Member] |  |  |
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage | 20.00% |  |
Defined Contribution Plan, Employer's Matching Contribution, Vesting Percentage, Upon Change of Control | 100.00% |  |
Defined Contribution Plan, Cost | $ 3,700,000 | $ 3,000,000.0 | $ 4,100,000
The 401K Plan [Member] | Savings Bank [Member] |  |  |
Defined Contribution Plan, Annual Employer Matching of Employees Contribution, Percent | 50.00% |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 3.00% |  |

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- Definition The amount held in a rabbi trust for certain non-qualified deferred compensation plans. + References No definition available. + Details
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- Definition The period of time the benefits used in a lump sum payment in the event of a termination with the defined benefits contribution. + References No definition available. + Details
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- Definition Percentage of employees' annual contributions for which the employer contributes a matching contribution to a defined contribution plan, up to a specified limit. + References No definition available. + Details
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- Definition Percentage of employer's matching contributions to a defined contribution plan that vests due to a change of control (as defined in the applicable plan). + References No definition available. + Details
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- Definition Employer contributions to the 401(k) and profit sharing plans funded by the Employee Benefit Trust. + References No definition available. + Details
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- Definition Required percentage of medical premiums to be paid by spouses of future retirees. + References No definition available. + Details
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- Definition Represents the number of unfunded postretirement benefit plans. + References No definition available. + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Percentage of employer's matching contributions to a defined contribution plan that vests in a given year. + References No definition available. + Details
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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