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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dividends declared per common share $ 0.85 $ 0.81 $ 0.76
Issuance of common shares pursuant to the Dividend Reinvestment Plan (in shares) 8,616 13,804 22,949
Stock issued during period, shares, deferred compensation 9,513 12,921 11,072
Restricted stock issued during period, shares, pursuant to the 2017 stock incentive plan 27,750 24,867 25,950
Common stock issued during period, shares, pursuant to the 2017 stock incentive plan 2,375    
Stock issued during period, shares, employee stock purchase plans 11,748 11,037 8,899
Purchase of treasury shares (in shares) 7,752 6,288 40,026
LINCO Bancshares, Inc.      
Stock Issued During Period, Shares, Acquisitions 1,262,246    
BBM & Associates, Inc.      
Stock Issued During Period, Shares, Acquisitions 25,000