Consolidated Statements of Shareholders' Equity (unaudited) (Parenthetical) - $ / shares	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Common stock, dividends per share	$ 0.39	$ 0.33
Stock Issued During Period, Shares, Employee Stock Ownership Plan	15,122	29,920
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	1,600	2,000
Common stock issuances from reinvested dividends, number of shares	7,166	4,921
Stock Issued During Period, Shares, Acquisitions	0	1,537,912