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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Change in projected benefit obligation: |  |  |  |
Service cost |  | $ 415 | $ 447 |
Interest cost | $ 1,190 | 1,314 | 1,426 |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of year | 26,836 |  |  |
Fair value of plan assets at end of year | 24,197 | 26,836 |  |
Other comprehensive (loss) income: |  |  |  |
Amount recognized in accumulated other comprehensive (loss) income - Prior service cost | $ (6,245) | $ (5,161) | $ (5,083) | $ (5,170)
Weighted-average assumptions used to determine benefit obligations for the year ended December 31: |  |  |  |
Discount rate | 3.35% | 3.85% | 4.00% |
Pension Benefits [Member] |  |  |  |
Change in projected benefit obligation: |  |  |  |
Projected benefit obligation at beginning of year | $ 36,327 | $ 35,012 | $ 36,140 |
Service cost |  | 415 | 447 |
Interest cost | 1,190 | 1,314 | 1,426 |
Actuarial (gain) / loss | (2,629) | 1,787 | 301 |
Administrative expenses |  | (402) | (606) |
Benefits paid | (1,890) | (1,799) | (2,696) |
Projected benefit obligation at end of year | 32,998 | 36,327 | 35,012 |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of year | 26,836 | 24,063 | 25,296 |
Actual (loss) return on plan assets | (1,388) | 3,152 | 2,040 |
Employer contribution | 639 | 1,822 | 29 |
Administrative expenses |  | (402) | (606) |
Benefits paid | (1,890) | (1,799) | (2,696) |
Fair value of plan assets at end of year | 24,197 | 26,836 | 24,063 |
Unfunded status | (8,801) | (9,491) | (10,949) |
Defined benefit liability included in other liabilities | (8,801) | (9,491) | (10,949) |
Deferred tax benefit associated with accumulated other comprehensive loss | 2,116 | 3,153 | 3,107 |
Accumulated other comprehensive loss, net of tax | 6,224 | 5,154 | 5,074 |
Other comprehensive (loss) income: |  |  |  |
Net loss (gain) | 271 | 358 | 90 |
Amortization of net actuarial gain | (238) | (227) | (212) |
Total recognized in other comprehensive (loss) income | 33 | 131 | (122) |
Amount recognized in accumulated other comprehensive (loss) income - Prior service cost | $ 8,340 | $ 8,307 | $ 8,181 |
Weighted-average assumptions used to determine benefit obligations for the year ended December 31: |  |  |  |
Discount rate | 4.05% | 3.35% | 3.85% |

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