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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dividends declared per common share $ 0.94 $ 0.92 $ 0.9
Stock issued during period, shares, deferred compensation 0 0 8,378
Restricted stock issued during period, shares, pursuant to the 2017 stock incentive plan, net of forfeitures 45,995 54,431 54,067
Common stock issued during period, shares, pursuant to the 2017 stock incentive plan, net of forfeitures 5,717 4,600 4,950
Stock issued during period, shares, employee stock purchase plans 32,936 38,989 23,055
Purchase of treasury shares (in shares) 15,978 13,481 10,647
Blackhawk Bancorp, Inc      
Stock Issued During Period, Shares, Acquisitions   3,290,222  
Delta Bancshares Company      
Stock Issued During Period, Shares, Acquisitions     2,292,270