Consolidated Statements of Shareholders' Equity (unaudited) (Parenthetical) - $ / shares	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Common stock, dividends per share	$ 0.33	$ 0.30
Stock Issued During Period, Shares, Employee Stock Ownership Plan	29,920	25,862
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	2,000
Common stock issuances from reinvested dividends, number of shares	4,921	4,235
Stock Issued During Period, Shares, Acquisitions	1,537,912