Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Consolidated Statements of Changes in Stockholders' Equity [Abstract]
Restricted stock compensation expense, shares	4,908
Exercise of stock options, shares	7,798	9,264
Cash dividends- common stock per share	$ 0.21	$ 0.21
Sale of treasury shares to 401(k), shares	8,828	8,366
Sale of treasury shares to deferred compensation plan, shares	4,209	4,313