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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Consolidated Statements of Changes in Shareholders' Equity
Shares issued in stock offering (in shares)		15,640,000
Issuance of restricted stock (in shares)		106,000
Cash dividend declared (in dollars per share)	$ 0.2625	$ 0.2625	$ 0.2563
Sale of treasury stock (in shares)	514,097	545,236	478,482

Number of new stock issued during the period.

Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.