Consolidated Statements of Stockholders' Equity (Parentheticals) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stock issued for employee stock purchase plan, shares (in shares)	43,681	60,413	39,782
Stock issued for compensation plans, shares (in shares)	362,080	261,200	278,743
Stock repurchases (in shares)	5,956,700	390,000
Cash dividends, per share (in dollars per share)	$ 0.68	$ 0.64	$ 0.60
Reliance Bancshares, Inc.
Stock issued for acquisition, shares (in shares)		3,999,623
Landrum Company
Stock issued for acquisition, shares (in shares)		17,349,722