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Equity Plans (Details) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		0 Months Ended				9 Months Ended	0 Months Ended			0 Months Ended
	Aug. 04, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Incentive Plan	Sep. 30, 2014 Employee Stock Purchase Plan (ESPP)	Sep. 30, 2013 Employee Stock Purchase Plan (ESPP)	Sep. 30, 2014 Employee Stock Purchase Plan (ESPP)	Sep. 30, 2013 Employee Stock Purchase Plan (ESPP)	Sep. 30, 2014 Dividend Reinvestment and Stock Purchase Plan (DRSPP)	Sep. 30, 2013 Dividend Reinvestment and Stock Purchase Plan (DRSPP)	Sep. 30, 2014 Dividend Reinvestment and Stock Purchase Plan (DRSPP)	Sep. 30, 2013 Dividend Reinvestment and Stock Purchase Plan (DRSPP)	Sep. 30, 2014 Restricted stock and deferred restricted stock	Sep. 30, 2013 Restricted stock and deferred restricted stock	Sep. 30, 2014 Restricted stock and deferred restricted stock	Sep. 30, 2013 Restricted stock and deferred restricted stock	Sep. 30, 2014 Stock options	Sep. 30, 2013 Stock options	Sep. 30, 2014 Stock options	Sep. 30, 2013 Stock options	Aug. 04, 2014 Restricted Stock Units (RSUs)	Apr. 30, 2014 Restricted Stock Units (RSUs)	Jan. 31, 2014 Restricted Stock Units (RSUs)	Jan. 02, 2014 Restricted Stock Units (RSUs) vesting_installment	Sep. 30, 2014 Restricted Stock Units (RSUs) vesting_installment	Aug. 04, 2014 Performance Shares	Sep. 30, 2014 Common Stock Employee Stock Purchase Plan (ESPP)	Apr. 14, 2014 Common Stock	Aug. 04, 2014 Minimum	Aug. 04, 2014 Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares available for issuance under the Incentive Plan (shares)						1,073,817
Shares issuable upon exercise of Incentive Plan awards (shares)						346,296
Compensation costs charged to income:		$ 323	$ 197	$ 774	$ 786		$ 76	$ 70	$ 148	$ 128					$ 247	$ 127	$ 626	$ 658
Excess tax benefits realized from share options exercised and stock issuance:		(3)	(68)	306	27										(3)	(95)	247	0	0	27	59	27
Proceeds from the exercise of stock options and similar instruments:		433	512	917	878		433	395	839	723	0	21	34	59					0	96	44	96
Number of equity instruments granted (shares)	36,988																						17,071	9,002	3,845	21,790		19,917
Number of equal successive installments for vesting of stock awards (vesting installments)																										3	3
Grant date fair value of equity instruments granted (usd per share)																							$ 24.14	$ 26.48	$ 26.39	$ 26.80		$ 26.81
Target vesting percentage																															0.00%	200.00%
Unrecognized compensation costs							48		48						1,863		1,863
Recognition period for unrecognized compensation cost																	1 year 6 months 29 days
Purchase price of common stock under ESPP (percent)									85.00%
Maximum percentage of base compensation employees can designate for stock purchases under ESPP (percent)							10.00%		10.00%
Number of shares authorized for issuance under the plan (shares)											3,000,000		3,000,000																400,000
Plan expense							$ 37	$ 34	$ 112	$ 102
Number of shares issued under the DRSPP (shares)											0	829	1,151	2,273
Shares Deregistered (in shares)																														2,993,744

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Number of shares reserved for issuance under equity instrument agreements awarded that validly exist and are outstanding, including vested instruments.

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Number of shares issued during the period from a dividend reinvestment and stock purchase plan (DRSPP). A dividend reinvestment and stock purchase plan allows the shareholders to reinvest dividends paid to them by the entity on new issues of stock by the entity and to purchase additional shares.

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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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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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Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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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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Purchase price of common stock expressed as a percentage of its fair value.

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The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

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