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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dividends declared per common share $ 0.90 $ 0.85 $ 0.81
Issuance of common shares pursuant to the Dividend Reinvestment Plan (in shares)   8,616 13,804
Stock issued during period, shares, deferred compensation 8,378 9,513 12,921
Restricted stock issued during period, shares, pursuant to the 2017 stock incentive plan 54,067 27,750 24,867
Common stock issued during period, shares, pursuant to the 2017 stock incentive plan 4,950 2,375  
Stock issued during period, shares, employee stock purchase plans 23,055 11,748 11,037
Purchase of treasury shares (in shares) 10,647 7,752 6,288
LINCO Bancshares, Inc.      
Stock Issued During Period, Shares, Acquisitions   1,262,246  
BBM & Associates, Inc.      
Stock Issued During Period, Shares, Acquisitions   25,000  
Delta Bancshares Company      
Stock Issued During Period, Shares, Acquisitions 2,292,270