Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Purchases of common stock (in shares)	0	0
Common stock dividends (in dollars per share)	$ 0.58	$ 0.38	$ 0.30
Common Stock
Common stock issued to Dividend Reinvestment Plan and employee benefit plans (in shares)	25,248	17,826	20,500
Conversion on non-voting common stock to voting common stock (in shares)			5,285,516
Purchases of common stock (in shares)			764,000
Common stock issued for acquisitions (in shares)	1,443,987	6,515,505
Exercise of stock options (in shares)	12,000
Vesting of restricted stock awards, net of shares surrendered to cover payroll taxes, issued (in shares)	125,067	114,837	96,722
Vesting of restricted stock awards, net of shares surrendered to cover payroll taxes, deferred (in shares)	99,779	111,090	106,771
Shares issued from deferred compensation plan (in shares)	48,214	32,279	61,899
Series H Preferred Stock
Redemption of Series H preferred stock (in shares)			9,992