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Employee Benefit Plans - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) Age Services | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Employee pretax contribution percentage | 100.00% |  |
Employees compensation | 50.00% |  |
Corporation's matching contribution and related expenses | $ 802 | $ 652 | $ 508
Profit sharing contributions | 6.00% |  |
Compensation percentage in excess of specified amount | 5.70% |  |
Excess of compensation | $ 127 |  |
Recognized profit sharing expense | 1,755 | 1,276 | 868
Obligations of other liabilities | 5,349 | 4,958 |
Expenses related employee benefit plans | 648 | 550 | 608
Obligations under survivor benefit plan | 1,264 | 1,175 |
Other liabilities related to survivor benefit plan | $ 89 | 33 | $ 155
Employee retirement health care benefits plan | Age | 60 |  |
Minimum service period for participation in benefit plan | Services | 30 |  |
Accumulated benefit obligation | $ 2,740 | $ 3,409 |
Amortized from accumulated other comprehensive income into net periodic benefit cost | $ 84 |  |
Weighted average discount rate net periodic benefit cost | 3.49% | 3.67% | 3.42%
Weighted average rate accrued benefit obligations | 3.13% | 3.49% | 3.67%
Expected costs of benefit | 5.00% |  |
Percent rate of increase in the health care trend | 1.00% |  |
Increase in health care trend rates | $ 267 |  |
Increase service and interest costs | $ 19 |  |
Percent rate of decrease in the health care trend | 1.00% |  |
Decrease in health care trend rates | $ 218 |  |
Decrease service and interest costs | $ 15 |  |
Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Employee contribution percentage | 1.00% |  |
Total contributed by employee percentage | 1.00% |  |
Qualifying dependents age group | Age | 60 |  |
Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Employee contribution percentage | 3.00% |  |
Total contributed by employee percentage | 2.00% |  |
Qualifying dependents age group | Age | 65 |  |

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