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CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Common Stock [Member]
Retained Earnings [Member]
Total
Balance at Dec. 31, 2014 $ 148,668 $ 48,623 $ 197,291
Balance, shares at Dec. 31, 2014 16,124,000    
Net Income   20,028 20,028
Dividend Reinvestment & Common Stock Purchase Plan $ 1,462   1,462
Dividend Reinvestment & Common Stock Purchase Plan, shares 63,000    
Restricted Stock Award, Net - Employees $ 528   528
Restricted Stock Award, Net - Employees, shares 33,000    
Stock Award - Board Of Directors $ 105   105
Stock Award - Board Of Directors, shares 5,000    
Cash Dividends on Common Stock   (12,554) (12,554)
Cash Dividends on Preferred Stock   (144) (144)
Common Stock Expenses   (22) (22)
Balance at Dec. 31, 2015 $ 150,763 55,931 206,694
Balance, shares at Dec. 31, 2015 16,225,000    
Net Income   22,742 22,742
Dividend Reinvestment & Common Stock Purchase Plan $ 1,453   1,453
Dividend Reinvestment & Common Stock Purchase Plan, shares 43,000    
Restricted Stock Award, Net - Employees $ 682   682
Restricted Stock Award, Net - Employees, shares 24,000    
Stock Award - Board Of Directors $ 147   147
Stock Award - Board Of Directors, shares 4,000    
Cash Dividends on Common Stock   (13,137) (13,137)
Cash Dividends on Preferred Stock   (144) (144)
Balance at Dec. 31, 2016 $ 153,045 65,392 218,437
Balance, shares at Dec. 31, 2016 16,296,000    
Net Income   22,809 22,809
Dividend Reinvestment & Common Stock Purchase Plan $ 1,234   1,234
Dividend Reinvestment & Common Stock Purchase Plan, shares 32,000    
Restricted Stock Award, Net - Employees $ 724   724
Restricted Stock Award, Net - Employees, shares 22,000    
Stock Award - Board Of Directors $ 147   147
Stock Award - Board Of Directors, shares 4,000    
Shares Forfeited $ (30)   (30)
Shares Forfeited, shares (2,000)    
Cash Dividends on Common Stock   (14,002) (14,002)
Cash Dividends on Preferred Stock   (144) (144)
Balance at Dec. 31, 2017 $ 155,120 $ 74,055 $ 229,175
Balance, shares at Dec. 31, 2017 16,352,000