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Employee Benefits - Certain Information Regarding Health and Welfare Plan (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Change in Plan Assets: |  |  |
Fair value of assets at end of year | $ 261,030 |  |
Post-Retirement Benefits |  |  |
Change in benefit obligation: |  |  |
Benefit obligation at beginning of year | 11,898 | $ 13,583 |
Interest cost | 327 | 512 | $ 513
Actuarial gain | 238 | (1,233) |
Premiums and claims paid | (614) | (964) |
Benefit obligation at end of year | 11,849 | 11,898 | $ 13,583
Change in Plan Assets: |  |  |
Employer contribution | 614 | 964 |
Premiums and claims paid | (614) | (964) |
Funded status (included in “Other liabilities”) | (11,849) | (11,898) |
Changes recognized in other comprehensive income for the year ended December 31: |  |  |
Amortization of prior service cost | 249 | 249 |
Amortization of actuarial gain | (25) | (124) |
Net actuarial (gain) loss arising during the year | 238 | (1,234) |
Total recognized in other comprehensive income for the year (pre-tax) | 462 | (1,109) |
Accumulated other comprehensive loss (pre-tax) not yet recognized in net periodic benefit cost at December 31: |  |  |
Prior service cost | (287) | (536) |
Actuarial loss, net | 1,679 | 1,466 |
Total accumulated other comprehensive loss (pre-tax) | $ 1,392 | $ 930 |

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