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Benefit Plans - Additional Information (Detail) |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2006 | Dec. 31, 2002 | Dec. 31, 2020 USD ($) retirement_payment $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined benefit plan age attained for coverage |  |  | 21 years |  |
Service period for employees of coverage age, years |  |  | 1 year |  |
Vesting percentage of participants in pension plan |  |  | 100.00% |  |
Expected future employer contributions next year |  |  | $ 0 |  |
Requisite service period for deferred compensation arrangement | 10 years | 10 years | 10 years |  |
Discount rate |  |  | 2.30% |  |
Decrease (increase) in other comprehensive income from retirement plans |  |  | $ 6,334 | $ 730 | $ 3,000
Retirement plan for the board of directors to get maximum payments minimum age |  |  | 72 years |  |
Number of quarterly payments made to Board of Directors from Retirement Plan | retirement_payment |  |  | 40 |  |
Benefit plans compensation expense |  |  | $ 1,250 |  |
Period in which undistributed balance of accrued benefit will be distributed |  |  | 60 days |  |
Shares purchased under ESOP | shares |  |  | 4,769,464 |  |
Average price per share purchased under ESOP (in dollars per share) | $ / shares |  |  | $ 17.09 |  |
Outstanding loan principal |  |  | $ 25,600,000 |  |
Number of shares released under ESOP | shares |  |  | 273,307 | 280,522 |
Unallocated ESOP shares held in suspense | shares |  |  | 1,183,180 |  |
Fair market value of ESOP shares |  |  | $ 21,300,000 |  |
ESOP compensation expenses |  |  | 2,400,000 | $ 4,500,000 | 4,500,000
Estimated expense under the supplemental ESOP provision |  |  | $ 180,000 | 140,000 | 121,000
Number of shares authorized for issuance under stock award plan | shares |  |  | 1,350,000 |  |
Unrecognized compensation cost relating go unvested restricted stock |  |  | $ 6,400,000 |  |
Weighted average period in which unrecognized compensation cost recognized years |  |  | 1 year 8 months 12 days |  |
Fair value of options vesting |  |  | $ 185,000 | $ 193,000 | $ 189,000
Projected share based compensation expense, 2019 |  |  | 139,000 |  |
Projected share based compensation expense, 2020 |  |  | 76,000 |  |
Projected share based compensation expense, 2021 |  |  | 11,000 |  |
Aggregate intrinsic value of stock options outstanding |  |  | $ 553,000 |  |
Weighted average fair value of options granted (in dollars per share) | $ / shares |  |  | $ 1.83 | $ 4.57 | $ 4.29
Restricted Stock |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Share based payment award vesting period in years |  |  | 3 years |  |
Outstanding Stock Awards |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Share based payment award compensation expense |  |  | $ 5,400,000 | $ 6,700,000 | $ 6,000,000.0
Outstanding Stock Awards | Share-based Compensation Award, Tranche Two |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Share based payment award vesting period in years |  |  | 3 years |  |
Stock Options |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Share based payment award vesting period in years |  |  | 5 years |  |
Share based payment award compensation expense |  |  | $ 190,000 | 181,000 | 190,000
Share based payment award expiration period in years |  |  | 10 years |  |
Performance Shares |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Share based payment award vesting period in years |  |  | 3 years |  |
Board of Directors |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Benefit plans compensation expense |  |  | $ 10,000 | 15,000 | 10,000
Other Liabilities |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Retirement plan liabilities |  |  | 1,800,000 | 1,900,000 |
Other Liabilities | Board of Directors |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Retirement plan liabilities |  |  | 127,000 | 130,000 |
Supplemental Executive Retirement Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Aggregate contributions to the benefit plan |  |  | 80,000 | 85,000 | 82,000
Decrease (increase) in other comprehensive income from retirement plans |  |  | $ (89,000) | $ 187,000 | $ 119,000
401(k) Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Percentage of matching contribution |  |  | 25.00% | 25.00% | 25.00%
Percentage of contribution made by the participants in benefit plans |  |  | 6.00% | 6.00% | 6.00%
Contribution to the Plan |  |  | $ 1,000,000.0 | $ 981,000 | $ 973,000
Estimated expense of supplemental ESOP provision |  |  | 25,000 | 22,000 | 18,000
Pension |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined benefit plan, funded (unfunded) status of plan |  |  | $ 19,447,000 | $ 16,874,000 | $ 14,571,000
Discount rate |  |  | 2.30% | 3.10% | 4.25%
Contribution to the Plan |  |  | $ 0 | $ 0 | $ 0
Post-retirement |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined benefit plan, funded (unfunded) status of plan |  |  | $ (18,805,000) | $ (23,323,000) | $ (20,028,000)
Discount rate |  |  | 2.30% | 3.10% | 4.25%
Contribution to the Plan |  |  | $ 627,000 | $ 600,000 | $ 590,000

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