Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Cash dividends declared per common share	$ 0.23	$ 0.23	$ 0.69	$ 0.67
Stock issued during period, shares, restricted stock award, forfeited	700	267
Stock issued during period, shares, employee stock purchase plans	11,624	6,104	28,762	14,430
Stock issued during period, shares, deferred compensation				8,378
Restricted stock issued during period, shares, pursuant to the 2017 stock incentive plan				54,567
Restricted stock issued during period, shares, pursuant to the 2017 stock incentive plan, net of forfeitures			54,498
Restricted stock issued during period, shares, pursuant to the 2017 stock incentive plan			4,350	4,950
Purchase of treasury shares (in shares)			170	262
Blackhawk Bancorp, Inc
Stock Issued During Period, Shares, Acquisitions	3,290,222		3,290,222
LINCO Bancshares, Inc.
Stock Issued During Period, Shares, Acquisitions				2,292,270