Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash dividends declared, per share	$ 0.61	$ 0.60	$ 0.60
Common stock issued in acquisition, shares		1,483,327
Treasury stock, shares net	5,516	117,633	182,507
Common Stock [Member]
Common stock issued in acquisition, shares		1,483,327
Additional Paid-in Capital [Member]
Common stock issued in acquisition, shares		1,483,327
Retained Earnings [Member]
Cash dividends declared, per share	$ 0.61	$ 0.60	$ 0.60
Treasury stock, shares net	5,516	117,633	182,507
Treasury Stock [Member]
Treasury stock, shares net	5,516	117,633	182,507