Consolidated Statements of Stockholders' Equity Parenthetical - $ / shares	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Statement of Stockholders' Equity [Abstract]
Cash Dividends Paid, per Share, in dollars per share	$ 0.728	$ 0.707
Exercised, in shares	34,889	80,449
Shares Issued Under Directors Stock Plan, in shares	3,927	3,522
Shares Issued Under Employee Stock Purchase Plan, in shares	10,869	13,041
Shares Issued for Dividend Reinvestment Plans - Shares	37,525	44,448
Purchase of Treasury Stock, in shares	83,256	64,146
Allocation of ESOP Stock, in shares		17,997