Consolidated Statements of Stockholders' Equity (Parentheticals) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Stock issued for employee stock purchase plan, shares (in shares)			42,510	59,475
Stock issued for compensation plans, shares (in shares)	37,536	39,416	301,166	326,236
Cash dividends per share (in dollars per share)	$ 0.20	$ 0.19	$ 0.60	$ 0.57
Stock issued for acquisition, shares (in shares)			2,257,049
Stock repurchases (in shares)	1,128,962	1,883,713	2,257,049	4,432,762
Spirit of Texas Bancshares, Inc.
Stock issued for acquisition, shares (in shares)				18,275,074