Share-Based Compensation - Additional Information (Detail) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock Based Compensation [Line Items]
Tax benefit associated with compensation expense	$ 71,000	$ 19,000	$ 13,000
Total compensation cost	203,000	48,000	33,000
Total compensation cost	566,000	336,000	220,000
Cash received from option exercise	122,000	136,000	195,000
Actual tax benefit realized for the tax deductions	43,000	58,000	30,000
Unrecognized compensation cost	903,000
Weighted-average period cost over which cost is expected to be recognized	1 year 6 months
Option Activity Under the 2013 Plan [Member]
Stock Based Compensation [Line Items]
Maximum common shares issued under the plan	691,700
Non-option awards granted	400,000
Number of shares available incentive stock options	100,000
Weighted average grant-date fair value of options granted	$ 6.50	$ 5.74	$ 3.25
Option Activity Under the 2003 Plan [Member]
Stock Based Compensation [Line Items]
Maximum common shares issued under the plan	337,500
Non-option awards granted	168,750
Additional common shares available for issuance	393,750
Grants vest at the end of	4 years
Option Activity Under the 2003 Plan [Member] \| Minimum [Member]
Stock Based Compensation [Line Items]
Grants vest at the end of	3 years
Option Activity Under the 2003 Plan [Member] \| Maximum [Member]
Stock Based Compensation [Line Items]
Grants vest at the end of	5 years
Restricted Stock [Member]
Stock Based Compensation [Line Items]
Tax benefit associated with compensation expense	127,000	115,000	75,000
Total compensation cost	$ 363,000	$ 288,000	$ 187,000

Common Stock Available Under Incentive Stock Options Maximum

No definition available.

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- Definition

This element represents the amount of recognized equity-based compensation related to stock options during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized).

+ References

No definition available.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.F)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

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- Definition

Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

+ References

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- Definition

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.

+ References

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- Definition

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

+ References

No definition available.

+ Details

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- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

+ References

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- Definition

Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

+ References

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- Definition

Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)

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-Publisher FASB

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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Number of additional shares authorized for issuance under an established share-based compensation plan.

+ References

No definition available.

+ Details

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

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- Definition

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

+ References

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