Number of Institutional Investors that Purchased Warrant

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Approved Payroll Deduction to Purchase Shares, Percentage

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No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares To Be Granted

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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.

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- Definition

Exercise price per share or per unit of warrants or rights outstanding.

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- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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- Definition

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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- Definition

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

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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.

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- Definition

Face amount per share of no-par value preferred stock nonredeemable or redeemable solely at the option of the issuer.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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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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Discount rate from fair value on purchase date that participants pay for shares.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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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).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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

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- Definition

Number of share instruments newly issued under a share-based compensation plan.

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- Definition

Percentage of vesting of share-based compensation awards.

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- Definition

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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- Definition

Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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- Definition

Number of new stock issued during the period.

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-Name Regulation S-X (SX)
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Stockholders' Equity and Stock Plans - Narrative (Details) $ / shares in Units, $ in Thousands	1 Months Ended		9 Months Ended	12 Months Ended
	Sep. 30, 2015 $ / shares shares	Nov. 30, 2011 investor	Sep. 30, 2015 $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares	Dec. 31, 2013 USD ($) shares	Dec. 31, 2005	May. 11, 2010 shares	Jul. 01, 2007 shares	May. 08, 2007 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of institutional investors that purchased warrant \| investor		2
Unrecognized compensation expense \| $				$ 1,500
Weighted average period unrecognized compensation expense will be recognized				2 years 3 months 18 days
Total compensation cost for share-based payment arrangements \| $				$ 636	$ 446	$ 403
Share-based compensation income tax benefit recognized \| $				194	128	109
Tax benefit realized from disqualifying dispositions of incentive stock options \| $				$ 49	$ 76	$ 94
Preferred stock, authorized (in shares)				5,000,000	5,000,000
Preferred stock, no par value (in dollars per share) \| $ / shares				$ 0	$ 0
Director Stock Plan, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common shares approved to be issued in each plan								150,000
Number of shares available for future grants under plan				118,965
Equity Plan, 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common shares approved to be issued in each plan										500,000
Number of shares available for future grants under plan				205,297
Number of shares to be granted				250,000
Employee Stock Purchase Plan, 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common shares approved to be issued in each plan									200,000
Number of shares available for future grants under plan				193,586
Discount from closing market price at end of each quarter				5.00%
Former 1999 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted				0
Nonemployee Director \| Vesting Rate, Year Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				20.00%
Nonemployee Director \| Vesting Rate, Year Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				20.00%
Nonemployee Director \| Vesting Rate Year Four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				20.00%
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common stock shares authorized to be purchased by warrant	157,711		157,711
Exercise price of warrant to purchase common stock \| $ / shares	$ 26.63		$ 26.63
Net issuance of shares of common stock from cashless exercise (in shares)	70,591
Common Stock \| Director Stock Plan, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares awarded in period from plan				5,295	5,306	5,619
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total grant-date fair value of option shares vested \| $				$ 202	$ 182	$ 187
Stock options \| Officer and Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period of grants				10 years
Stock options \| Nonemployee Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period							4 years
Expiration period of grants				7 years
Stock options \| Nonemployee Director \| Immediately Upon Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				20.00%
Stock options \| Nonemployee Director \| Vesting Rate, Year One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				20.00%
Restricted stock award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total grant-date fair value of option shares vested \| $				$ 262	$ 227	$ 218
Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			3 years
Prior to January 1, 2006 \| Stock options \| Officer and Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period							4 years
Prior to January 1, 2006 \| Stock options \| Officer and Employee \| Immediately Upon Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage							20.00%
Prior to January 1, 2006 \| Stock options \| Officer and Employee \| Vesting Rate, Year One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage							20.00%
Prior to January 1, 2006 \| Stock options \| Officer and Employee \| Vesting Rate, Year Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage							20.00%
Prior to January 1, 2006 \| Stock options \| Officer and Employee \| Vesting Rate, Year Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage							20.00%
Prior to January 1, 2006 \| Stock options \| Officer and Employee \| Vesting Rate Year Four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage							20.00%
Subsequent to January 1, 2006 \| Stock options \| Vesting Rate, Year One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage					20.00%
Subsequent to January 1, 2006 \| Stock options \| Vesting Rate, Year Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage					20.00%
Subsequent to January 1, 2006 \| Stock options \| Vesting Rate, Year Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage					20.00%
Subsequent to January 1, 2006 \| Stock options \| Vesting Rate Year Four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage					20.00%
Subsequent to January 1, 2006 \| Stock options \| Vesting Rate Year Five
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage					20.00%
Subsequent to January 1, 2006 \| Restricted stock award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period					5 years
Subsequent to January 1, 2006 \| Restricted stock award \| Vesting Rate, Year One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage					20.00%
Subsequent to January 1, 2006 \| Restricted stock award \| Vesting Rate, Year Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage					20.00%
Subsequent to January 1, 2006 \| Restricted stock award \| Vesting Rate, Year Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage					20.00%
Subsequent to January 1, 2006 \| Restricted stock award \| Vesting Rate Year Four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage					20.00%
Subsequent to January 1, 2006 \| Restricted stock award \| Vesting Rate Year Five
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage					20.00%
Subsequent To January 1, 2015 \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				33000.00%
Subsequent To January 1, 2015 \| Stock options \| Vesting Rate, Year One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period							3 years
Subsequent To January 1, 2015 \| Restricted stock award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				33.00%
Award vesting period							3 years
Minimum \| Employee Stock Purchase Plan, 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Approved payroll deduction to purchase shares, percentage				1.00%
Minimum \| Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			0.00%
Maximum \| Employee Stock Purchase Plan, 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Approved payroll deduction to purchase shares, percentage				15.00%
Maximum \| Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			200.00%
U.S. Treasury Capital Purchase Program (TCPP) \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common stock shares authorized to be purchased by warrant				154,242
Exercise price of warrant to purchase common stock \| $ / shares				$ 27.23