Stockholder's Equity Parenthetical (Parentheticals) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash Dividends Paid, per Share	$ 0.99	$ 0.97	$ 0.95
Stock Dividends - Shares	341,400	334,890	328,323
Stock Options Exercised - Shares	43,096	61,364	58,719
Shares Issued Under Directors Stock Plan - Shares	8,480	7,584	7,643
Shares Issued Under the Employee Stock Purchase Plan - Shares	19,036	19,575	19,679
Shares Issued for Dividend Reinvestment Plans - Shares	32,171	0	49,574
Purchase of Treasury Stock - Shares	55,368	95,064	68,361
Acquisition of Subsidiary - Shares	0	3,595	9,503
Allocation of ESOP Stock - Shares	17,645	17,300	16,969