Consolidated Statements of Stockholders' Equity Parenthetical - $ / shares	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Statement of Stockholders' Equity [Abstract]
Cash Dividends Paid, per Share, in dollars per share	$ 0.50	$ 0.485
Exercised, in shares	33,062	59,711
Shares Issued Under Directors Stock Plan, in shares	3,927	3,522
Shares Issued Under Employee Stock Purchase Plan, in shares	7,300	9,433
Shares Issued for Dividend Reinvestment Plans - Shares	24,999	31,275
Purchase of Treasury Stock, in shares	56,908	58,605
Allocation of ESOP Stock, in shares		26,604