Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Consolidated Statements of Changes in Shareholders' Equity (Unaudited) [Abstract]
Cash dividend declared (in dollars per share)	$ 0.1969	$ 0.1969
Stock options exercised and related tax (in shares)	147,630	19,429
Purchase of treasury stock (in shares)	111,906	14,881
Sale of treasury stock (in shares)	316,337	286,844