Consolidated Statements of Shareholders' Equity (unaudited) (Parenthetical) - $ / shares	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Common stock, dividends per share	$ 0.22	$ 0.20
Stock Issued During Period, Shares, Employee Stock Ownership Plan	19,711	17,786
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	2,000
Common stock issuances from reinvested dividends, number of shares	3,133	2,790
Stock Issued During Period, Shares, Acquisitions	1,537,912