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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statement Of Stockholders Equity [Abstract]
Common stock cash dividends declared, per share (in dollars per share)	$ 0.835	$ 0.62	$ 0.62
Stock activity under stock compensation plans (in shares)	160,228	47,900	90,658
Redemption of shares of preferred stock (in shares)			56,044
Treasury shares purchased under deferred directors' plan (in shares)	15,864	10,648	11,081
Treasury stock sold and distributed under deferred directors' plan (in shares)		30,100	21,491

Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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