Share-based Compensation Plans - Share-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Summary of the expenses the Company has recognized related to share-based compensation
Allocated Share-based Compensation Expense	$ 362	$ 294	$ 569	$ 535
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	2,289	2,008	2,289	2,008
Income tax benefit recognized related to share-based compensation			108	69
Stock options
Summary of the expenses the Company has recognized related to share-based compensation
Allocated Share-based Compensation Expense	103	136	226	248
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	766	1,109	766	1,109
Income tax benefit recognized related to share-based compensation			$ 108
Weighted-average period over which expense is expected to be recognized			2 years 4 months 24 days
Restricted stock
Summary of the expenses the Company has recognized related to share-based compensation
Allocated Share-based Compensation Expense	199	158	$ 283	287
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	925	$ 899	$ 925	$ 899
Weighted-average period over which expense is expected to be recognized			2 years 2 months 12 days
Restricted stock units
Summary of the expenses the Company has recognized related to share-based compensation
Allocated Share-based Compensation Expense	60		$ 60
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 598		$ 598
Weighted-average period over which expense is expected to be recognized			2 years 9 months 18 days

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-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

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section F

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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

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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.

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section 50
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-Subparagraph (h)(1)(i)
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