Condensed Consolidated Statements of Changes in Stockholders' Equity Condensed Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Changes in Stockholders' Equity [Abstract]
Dividends on common stock (in dollars per share)	$ 0.36	$ 0.34	$ 0.36	$ 0.34
Stock Issued During Period, Shares, Dividend Reinvestment Plan	13,475	14,626	13,475	14,626
Deferred Compensation Arrangement with Individual, Shares Issued	7,398	5,342	7,398	5,342
Stock Issued During Period, Shares, Restricted Stock Award, Gross	0	0	25,950	13,250
Stock Issued During Period, Shares, New Issues	0	947,368	0	947,368
Stock Issued During Period, Shares, Acquisitions	0	1,643,900	0	1,643,900
Stock Issued During Period, Shares, Employee Stock Purchase Plans	0	0	2,858	782
Treasury Stock, Shares, Acquired	0	2,588	0	2,588
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures	0	2,500	0	2,500