Stockholder's Equity Parenthetical (Parentheticals) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash Dividends Paid, per Share	$ 0.98	$ 0.96	$ 0.94
Stock Dividends - Shares	522,425	341,400	334,890
Stock Options Exercised - Shares	109,651	43,096	61,364
Shares Issued Under Directors Stock Plan - Shares	6,005	8,480	7,584
Shares Issued Under the Employee Stock Purchase Plan - Shares	17,113	19,036	19,575
Shares Issued for Dividend Reinvestment Plans - Shares	55,432	32,171	0
Purchase of Treasury Stock - Shares	72,723	55,368	95,064
Acquisition of Subsidiary - Shares	0	0	3,595
Allocation of ESOP Stock - Shares	36,927	17,645	17,300