Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Stockholders' Equity [Abstract]
Common stock issued to Dividend Reinvestment Plan and employee benefit plans (in shares)	83,557	25,248	17,826
Common stock issued for acquisitions (in shares)		1,443,987	6,515,505
Exercise of stock options (in shares)	13,000	12,000
Vesting of restricted stock unit awards, net of shares withheld to cover payroll taxes, issued (in shares)	109,100	125,067	114,837
Vesting of restricted stock unit awards, net of shares withheld to cover payroll taxes, deferred (in shares)	55,271	99,779	111,090
Shares issued from deferred compensation plan (in shares)	74,490	48,214	32,279
Common stock dividends (in dollars per share)	$ 0.68	$ 0.58	$ 0.38
Purchases of common stock (in shares)	500,495	0