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After tax net amount of gain (loss) that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases (decreases) in other comprehensive income as they arise.

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Amount after tax of cost (credit) due to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as a component of net periodic benefit cost.

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The amount of net gain (loss) recognized in net periodic benefit cost as a result of an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services.

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The amount of the cost recognized during the period for defined contribution plans.

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Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Gross number of share options (or share units) granted during the period.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Benefit Plans - Additional Information (Detail) - USD ($)		12 Months Ended
	Jul. 12, 1999	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Apr. 30, 2015	Apr. 26, 2007
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Minimum year of service to qualify for post-retirement medical benefits		20 years
Minimum age to qualify for post-retirement medical benefits		60 years
Condition to qualify for post-retirement medical benefits		Employees who worked 20 years and attained a minimum age of 60 by September 1, 2000
Gain on curtailments		$ 1,072,000
Accumulated benefit obligation		333,000	$ 1,600,000
Estimated net gain for the postretirement plan		895,000
Prior service costs for the postretirement plan		$ 228,000
Weighted-average annual assumed rate of increase in the per capita cost of coverage benefits, 2015		0.00%
Matching contribution percentage		50.00%	25.00%	25.00%
Maximum pre-tax contribution of the employees' base pay		6.00%	6.00%	6.00%
Percentage of vesting of participants in Home Savings contributions		100.00%
Minimum service required for vesting in Home Savings contribution		3 years
Expense related to the plan		$ 465,000	$ 224,000	$ 204,000
Shares, Granted		6,618	7,124
Weighted average remaining life for outstanding stock		4 years 18 days
Exercise price range, lower range limit		$ 1.20
Exercise price range, upper range limit		$ 5.89
Stock Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Option expiry term (years)		10 years
Stock-based compensation expense		$ 24,000	$ 25,000	24,000
Expected additional expense for 2016		8,000
Expected additional expense for 2017		$ 1,000
Weighted-average recognition period of nonvested stock options expense		1 year 6 months
Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense		$ 756,000	$ 482,000	328,000
Expected additional expense for 2016		601,000
Expected additional expense for 2017		$ 288,000
Nonvested shares		260,490	223,624
Vested shares during 2016		114,708
Vested shares during 2017		84,359
Vested shares during 2018		61,423
Expected additional expense for 2018		$ 122,000
Average per share fair value of shares vested		$ 4.03
2015 Long Term Incentive Compensation Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Authorized shares of stock, option plan, maximum					1,200,000
2007 Long-Term Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Authorized shares of stock, option plan, maximum						2,000,000
Unrecognized cost of nonvested stock options granted		$ 9,000
1999 Long-Term Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Authorized shares of stock, option plan, maximum		3,569,766
Option expiry term (years)	10 years
1999 Long-Term Incentive Plan [Member] \| Stock Option [Member] \| Beginning on December 31, 2009 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation vesting period	3 years
Executive Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of amount paid in cash		80.00%
Percentage of amount paid in restricted stock		20.00%
Executive Incentive Plan [Member] \| Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense		$ 269,000	$ 286,000	$ 98,000
Average per share fair value of shares vested		$ 5.48	$ 4.73	$ 3.74
Executive Incentive Plan [Member] \| Restricted Stock [Member] \| Beginning on first anniversary of issue date [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation vesting period		3 years
Executive Incentive Plan [Member] \| Cash Portion [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense		$ 804,000	$ 640,000	$ 350,000
Long Term Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense		$ 199,000	$ 179,000	$ 0