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Stock-Based Compensation (Details 4) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Restricted Stock
Shares
Outstanding at the beginning of the period (in shares)	185,764	106,838	53,945
Granted (in shares)	76,590	106,289	65,285
Vested (in shares)	(48,513)	(25,248)	(11,128)
Forfeited (in shares)	(2,125)	(2,115)	(1,264)
Outstanding unvested at the end of the period (in shares)	211,716	185,764	106,838
Weighted-Average Grant Date Fair Value
Outstanding at the beginning of the period (in dollars per share)	$ 19.54	$ 21.47	$ 17.15
Granted (in dollars per share)	$ 24.48	$ 17.95	$ 24.23
Vested (in dollars per share)	$ 19.50	$ 21.07	$ 17.13
Forfeited (in dollars per share)	$ 20.03	$ 18.91	$ 17.74
Outstanding unvested at the end of the period (in dollars per share)	$ 21.33	$ 19.54	$ 21.47
Restricted Stock | Various employees | Minimum
Additional disclosures
Vesting period	3 years
Restricted Stock | Various employees | Maximum
Additional disclosures
Vesting period	5 years
Restricted Stock | Eligible members of the Board of Directors
Additional disclosures
Vesting period	3 years
Performance Awards
Shares
Outstanding at the beginning of the period (in shares)	74,923	74,435	40,256
Granted at target (in shares)	46,106	41,755	34,179
Earned for performance above target (in shares)	11,281
Forfeited for performance below target (in shares)		(9,401)
Vested (in shares)	(45,116)	(30,855)
Forfeited (in shares)		(1,011)
Outstanding unvested at the end of the period (in shares)	87,194	74,923	74,435
Weighted-Average Grant Date Fair Value
Outstanding at the beginning of the period (in dollars per share)	$ 20.51	$ 20.39	$ 17.18
Granted at target (in dollars per share)	$ 24.68	$ 17.48	$ 24.18
Earned for performance above target (in dollars per share)	$ 24.18
Forfeited for performance below target (in dollars per share)		$ 17.18
Vested (in dollars per share)	$ 24.18	$ 17.18
Forfeited (in dollars per share)		$ 19.76
Outstanding unvested at the end of the period (in dollars per share)	$ 21.29	$ 20.51	$ 20.39
Shares earned by the participants	45,116	30,855
Target awards earned during the performance period (as a percent)	133.30%	76.60%
Performance Awards | Minimum
Weighted-Average Grant Date Fair Value
Potential payout as a percentage of target shares	50.00%
Performance Awards | Maximum
Weighted-Average Grant Date Fair Value
Potential payout as a percentage of target shares	200.00%

X

- Definition

Represents the number of equity-based payment instruments other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan) earned for performance above target during the period.

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Represents the weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were earned for performance above target during the period.

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Represents the percentage of target awards earned for the performance period.

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The percentage of target shares, an employee can earn, under the plan.

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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 equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Number of non-option equity instruments exercised by participants.

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