CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Common stock issued for stock grants- Gross (in shares)			5,283
Common stock, forfeited (in shares)			437
Dividends per share (in dollars per share)	$ 0.31	$ 0.29	$ 0.62	$ 0.58
Common stock, par value (in dollars per share)	$ 0		$ 0		$ 0
Director
Common stock issued for stock grants- Gross (in shares)			981
Common stock issued - Stock options exercised (in shares)			$ 600