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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash dividends declared, per common share	$ 0.96	$ 0.96	$ 0.96
Common stock issued, long-term incentive plan, income tax benefit	$ 376	$ 104	$ 322
Common Stock [Member]
Common stock issued, long-term incentive plan, income tax benefit	376	104	322
Capital Surplus [Member]
Common stock issued, long-term incentive plan, income tax benefit	$ 376	$ 104	$ 322
Retained Earnings [Member]
Cash dividends declared, per common share	$ 0.96	$ 0.96	$ 0.96

Tax benefit associated with any equity-based compensation plan other than an employee stock ownership plan (ESOP). The tax benefit results from the deduction by the entity on its tax return for an award of stock that exceeds the cumulative compensation cost for common stock or preferred stock recognized for financial reporting. Includes any resulting tax benefit that exceeds the previously recognized deferred tax asset (excess tax benefits).

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