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Consolidated Statements of Changes in Stockholders' Equity Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dividends on common stock (in dollars per share) $ 0.76 $ 0.70 $ 0.66
Issuance of common shares pursuant to the Dividend Reinvestment Plan (in shares) 22,949 30,655 30,059
Issuance of common shares pursuant to the Deferred Compensation Plan (in shares) 11,072 9,043 6,875
Issuance of restricted common shares pursuant to the Stock Incentive Plan (in shares) 25,950 13,250 47,339
Stock Issued During Period, Shares, Employee Stock Purchase Plans 8,899 0 0
Purchase of treasury shares (in shares) 40,026 3,900 20,734
Issuance of common shares pursuant to the exercise of stock options (in shares) 0 10,500 27,500
First BancTrust [Member]      
Stock Issued During Period, Shares, Acquisitions 0 1,643,900 0
SCB Bancorp [Member]      
Stock Issued During Period, Shares, Acquisitions 0 1,330,571 0
Capital Raise [Member] | Common Stock      
Stock issued during period, new issue (in shares) 0 947,368 0
At The Market Program [Member] | Common Stock      
Stock issued during period, new issue (in shares) 0 0 98,710