CONDENSED CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Retained Earnings [Member]	Total
Balance at Dec. 31, 2020	$ 217,451	$ 128,757	$ 346,208
Balance, shares at Dec. 31, 2020	17,473
Net Income		17,828	17,828
Dividend Reinvestment & Common Stock Purchase Plan	$ 596		596
Dividend Reinvestment & Common Stock Purchase Plan, shares	8
Restricted Stock Award - Net - Employees	$ (192)		(192)
Restricted Stock Award - Net - Employees, shares	6
Restricted Stock Award - Board of Directors	$ 245		245
Restricted Stock Award - Board of Directors, shares	3
Cash Dividends on Common Stock		(9,527)	(9,527)
Cash Dividends on Preferred Stock		(60)	(60)
Balance at Jun. 30, 2021	$ 218,100	136,998	355,098
Balance, shares at Jun. 30, 2021	17,490
Balance at Mar. 31, 2021	$ 217,977	130,873	348,850
Balance, shares at Mar. 31, 2021	17,478
Net Income		10,923	10,923
Dividend Reinvestment & Common Stock Purchase Plan	$ 272		272
Dividend Reinvestment & Common Stock Purchase Plan, shares	3
Restricted Stock Award - Net - Employees	$ (394)		(394)
Restricted Stock Award - Net - Employees, shares	6
Restricted Stock Award - Board of Directors	$ 245		245
Restricted Stock Award - Board of Directors, shares	3
Cash Dividends on Common Stock		(4,768)	(4,768)
Cash Dividends on Preferred Stock		(30)	(30)
Balance at Jun. 30, 2021	$ 218,100	136,998	355,098
Balance, shares at Jun. 30, 2021	17,490
Balance at Dec. 31, 2021	$ 221,919	145,807	367,726
Balance, shares at Dec. 31, 2021	17,522
Net Income		20,968	20,968
Dividend Reinvestment & Common Stock Purchase Plan	$ 7,039		7,039
Dividend Reinvestment & Common Stock Purchase Plan, shares	76
Restricted Stock Award - Net - Employees	$ (201)		(201)
Restricted Stock Award - Net - Employees, shares	3
Restricted Stock Award - Board of Directors	$ 280		280
Restricted Stock Award - Board of Directors, shares	3
Cash Dividends on Common Stock		(10,184)	(10,184)
Cash Dividends on Preferred Stock		(60)	(60)
Balance at Jun. 30, 2022	$ 229,037	156,531	385,568
Balance, shares at Jun. 30, 2022	17,604
Balance at Mar. 31, 2022	$ 225,092	152,790	377,882
Balance, shares at Mar. 31, 2022	17,551
Net Income		8,868	8,868
Dividend Reinvestment & Common Stock Purchase Plan	$ 4,134		4,134
Dividend Reinvestment & Common Stock Purchase Plan, shares	47
Restricted Stock Award - Net - Employees	$ (469)		(469)
Restricted Stock Award - Net - Employees, shares	3
Restricted Stock Award - Board of Directors	$ 280		280
Restricted Stock Award - Board of Directors, shares	3
Cash Dividends on Common Stock		(5,097)	(5,097)
Cash Dividends on Preferred Stock		(30)	(30)
Balance at Jun. 30, 2022	$ 229,037	$ 156,531	$ 385,568
Balance, shares at Jun. 30, 2022	17,604