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Employee Benefit Plans - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) service age	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee pretax contribution percentage	100.00%
Employee contribution	1.00%
Employee contribution percentage	3.00%
Employees compensation	50.00%
Total contributed by employee percentage	2.00%
Corporation's matching contribution and related expenses	$ 810	$ 802	$ 652
Profit sharing contributions	6.00%
Compensation percentage in excess of specified amount	5.70%
Excess of compensation	$ 128
Recognized profit sharing expense	1,530	1,755	1,276
Obligations of other liabilities	5,867	5,349
Expenses related employee benefit plans	776	648	550
Obligations under survivor benefit plan	1,330	1,264
Other liabilities related to survivor benefit plan	$ 66	89	$ 33
Employee retirement health care benefits plan | age	60
Minimum service period for participation in benefit plan | service	30
Accumulated benefit obligation	$ 2,427	$ 2,740
Amortized from accumulated other comprehensive income into net periodic benefit cost	$ 23
Weighted average discount rate net periodic benefit cost	3.13%	3.49%	3.67%
Accrued benefit obligations	3.78%	3.13%	3.49%
Expected costs of benefit	5.00%
Increase in health care trend rates	$ 182
Increase service and interest costs	14
Decrease in health care trend rates	165
Decrease service and interest costs	$ 13
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Qualifying dependents age group | age	60
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Qualifying dependents age group | age	65

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