CONDENSED CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDERS' EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Retained Earnings [Member]	Total
Balance at Dec. 31, 2019	$ 215,125	$ 108,667	$ 323,792
Balance, shares at Dec. 31, 2019	17,434
Net Income		7,668	7,668
Dividend Reinvestment & Common Stock Purchase Plan	$ 313		313
Dividend Reinvestment & Common Stock Purchase Plan, shares	5
Restricted Stock Award, Net - Employees	$ 162		162
Cash Dividends on Common Stock		(4,468)	(4,468)
Cash Dividends on Preferred Stock		(30)	(30)
Common Stock Expenses		(37)	(37)
Balance at Mar. 31, 2020	$ 215,600	111,800	327,400
Balance, shares at Mar. 31, 2020	17,439
Balance at Dec. 31, 2020	$ 217,451	128,757	346,208
Balance, shares at Dec. 31, 2020	17,473
Net Income		6,907	6,907
Dividend Reinvestment & Common Stock Purchase Plan	$ 322		322
Dividend Reinvestment & Common Stock Purchase Plan, shares	5
Restricted Stock Award, Net - Employees	$ 203		203
Cash Dividends on Common Stock		(4,762)	(4,762)
Cash Dividends on Preferred Stock		(30)	(30)
Balance at Mar. 31, 2021	$ 217,976	$ 130,872	$ 348,848
Balance, shares at Mar. 31, 2021	17,478