Consolidated Statements of Shareholders' Equity (unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Common stock, dividends per share	$ 0.13	$ 0.11
Stock Issued During Period, Shares, Employee Stock Ownership Plan	5,081	9,911
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	200	2,000
Common stock issuances from reinvested dividends, number of shares	2,517	1,596