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CONDENSED CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDERS' EQUITY (Unaudited) - USD ($)
$ in Thousands
Common Stock [Member]
Retained Earnings [Member]
Total
Balance at Dec. 31, 2017 $ 155,120 $ 74,055 $ 229,175
Balance, shares at Dec. 31, 2017 16,352,000    
Net Income 25,459 25,459
Dividend Reinvestment & Common Stock Purchase Plan $ 864 $ 864
Dividend Reinvestment & Common Stock Purchase Plan, shares 21,000   21,001
Restricted Stock Award, Net - Employees $ 628 $ 628
Restricted Stock Award, Net - Employees, shares 23,000    
Stock Award - Board Of Directors $ 147 147
Stock Award - Board Of Directors, shares 4,000    
Shares Forfeited $ (18) (18)
Shares Forfeited, shares (2,000)    
Cash Dividends on Common Stock (10,993) (10,993)
Cash Dividends on Common Stock, shares    
Cash Dividends on Preferred Stock (108) (108)
Cash Dividends on Preferred Stock, shares    
Balance at Sep. 30, 2018 $ 156,741 88,413 245,154
Balance, shares at Sep. 30, 2018 16,398,000    
Balance at Jun. 30, 2018 $ 156,251 79,828 236,077
Balance, shares at Jun. 30, 2018 16,392,000    
Net Income 12,290 12,290
Dividend Reinvestment & Common Stock Purchase Plan $ 266 266
Dividend Reinvestment & Common Stock Purchase Plan, shares 8,000    
Restricted Stock Award, Net - Employees $ 242 242
Restricted Stock Award, Net - Employees, shares    
Shares Forfeited $ (18) (18)
Shares Forfeited, shares (2,000)    
Cash Dividends on Common Stock (3,667) (3,667)
Cash Dividends on Common Stock, shares    
Cash Dividends on Preferred Stock (36) (36)
Cash Dividends on Preferred Stock, shares    
Balance at Sep. 30, 2018 $ 156,741 88,413 245,154
Balance, shares at Sep. 30, 2018 16,398,000    
Balance at Dec. 31, 2018 $ 157,354 91,433 248,787
Balance, shares at Dec. 31, 2018 16,403,000    
Net Income 25,818 25,818
Dividend Reinvestment & Common Stock Purchase Plan $ 12,449 $ 12,449
Dividend Reinvestment & Common Stock Purchase Plan, shares 222,000   221,558
Restricted Stock Award, Net - Employees $ 679 $ 679
Restricted Stock Award, Net - Employees, shares 18,000    
Stock Award - Board Of Directors $ 196 196
Stock Award - Board Of Directors, shares 4,000    
Shares Forfeited $ (466) (466)
Shares Forfeited, shares (18,000)    
Conversion of $8.00 Convertible Preferred Stock $ 350 350
Conversion of $8.00 Convertible Preferred Stock, shares 41,000    
Cash Dividends on Common Stock (11,893) (11,893)
Cash Dividends on Common Stock, shares    
Cash Dividends on Preferred Stock (102) (102)
Cash Dividends on Preferred Stock, shares    
Common Stock Expenses (23) (23)
Common Stock Expenses, shares    
Balance at Sep. 30, 2019 $ 170,562 105,233 275,795
Balance, shares at Sep. 30, 2019 16,670,000    
Balance at Jun. 30, 2019 $ 165,138 98,146 263,284
Balance, shares at Jun. 30, 2019 16,554,000    
Net Income 11,119 11,119
Dividend Reinvestment & Common Stock Purchase Plan $ 5,368 5,368
Dividend Reinvestment & Common Stock Purchase Plan, shares 92,000    
Restricted Stock Award, Net - Employees $ 172 172
Restricted Stock Award, Net - Employees, shares 1,000    
Shares Forfeited $ (466) (466)
Shares Forfeited, shares (18,000)    
Conversion of $8.00 Convertible Preferred Stock $ 350 350
Conversion of $8.00 Convertible Preferred Stock, shares 41,000    
Cash Dividends on Common Stock (3,987) (3,987)
Cash Dividends on Common Stock, shares    
Cash Dividends on Preferred Stock (30) (30)
Cash Dividends on Preferred Stock, shares    
Common Stock Expenses (15) (15)
Common Stock Expenses, shares    
Balance at Sep. 30, 2019 $ 170,562 $ 105,233 $ 275,795
Balance, shares at Sep. 30, 2019 16,670,000