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Pension and Employee Benefit Plans - Schedule of Changes in Projected Benefit Obligations (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Change in projected benefit obligation: |  |  |  |
Service cost |  |  | $ 415 |
Interest cost | $ 1,303 | $ 1,190 | 1,314 |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of year | 24,197 |  |  |
Fair value of plan assets at end of year | 27,099 | 24,197 |  |
Other comprehensive income (loss): |  |  |  |
Amount recognized in accumulated other comprehensive income (loss) - Prior service cost | $ (6,429) | $ (6,245) | $ (5,161) | $ (5,083)
Weighted-average assumptions used to determine benefit obligations for the year ended December 31: |  |  |  |
Discount rate | 4.05% | 3.35% | 3.85% |
Pension Benefits [Member] |  |  |  |
Change in projected benefit obligation: |  |  |  |
Projected benefit obligation at beginning of year | $ 32,998 | $ 36,327 | $ 35,012 |
Service cost |  |  | 415 |
Interest cost | 1,303 | 1,190 | 1,314 |
Actuarial loss (gain) | 3,704 | (2,629) | 1,787 |
Administrative expenses |  |  | (402) |
Benefits paid | (2,020) | (1,890) | (1,799) |
Projected benefit obligation at end of year | 35,985 | 32,998 | 36,327 |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of year | 24,197 | 26,836 | 24,063 |
Actual return (loss) on plan assets | 4,431 | (1,388) | 3,152 |
Employer contribution | 491 | 639 | 1,822 |
Administrative expenses |  |  | (402) |
Benefits paid | (2,020) | (1,890) | (1,799) |
Fair value of plan assets at end of year | 27,099 | 24,197 | 26,836 |
Unfunded status | (8,886) | (8,801) | (9,491) |
Defined benefit liability included in other liabilities | (8,886) | (8,801) | (9,491) |
Deferred tax benefit associated with accumulated other comprehensive loss | 2,183 | 2,116 | 3,153 |
Accumulated other comprehensive loss, net of tax | 6,420 | 6,224 | 5,154 |
Other comprehensive income (loss): |  |  |  |
Net loss | 527 | 271 | 358 |
Amortization of net actuarial gain | (263) | (238) | (227) |
Total recognized in other comprehensive income (loss) | 264 | 33 | 131 |
Amount recognized in accumulated other comprehensive income (loss) - Prior service cost | $ 8,603 | $ 8,340 | $ 8,307 |
Weighted-average assumptions used to determine benefit obligations for the year ended December 31: |  |  |  |
Discount rate | 2.95% | 4.05% | 3.35% |

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