Consolidated Statements of Stockholders' Equity (Parentheticals) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Stock issued for employee stock purchase plan, shares (in shares)	60,697	43,681	60,413
Stock issued for compensation plans, shares (in shares)	474,970	362,080	261,200
Stock repurchases (in shares)	4,562,469	5,956,700	390,000
Cash dividends, per share (in dollars per share)	$ 0.72	$ 0.68	$ 0.64
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
Landmark Bank
Stock issued for acquisition, shares (in shares)	4,499,872
Triumph
Stock issued for acquisition, shares (in shares)	4,164,712