Capitalization (Schedule of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Basic:
Net Income	$ 8,071	$ 11,119	$ 8,146	$ 6,552	$ 6,993	$ 12,290	$ 8,675	$ 4,494	$ 33,888	$ 32,452	$ 22,809
Preferred Dividend									(132)	(144)	(144)
Earnings Applicable to Common Stock									$ 33,756	$ 32,308	$ 22,665
Weighted-average number of basic shares outstanding, shares									16,685	16,384	16,330
Basic EPS	$ 0.46	$ 0.67	$ 0.49	$ 0.40	$ 0.43	$ 0.75	$ 0.52	$ 0.27	$ 2.02	$ 1.97	$ 1.39
Diluted:
$7.00 Series Preferred Dividend									$ 67	$ 67	$ 67
$8.00 Series Preferred Dividend										24	24
Adjusted Earnings Applicable to Common Stock									$ 33,835	$ 32,399	$ 22,756
Incremental common shares attributable to $7.00 series preferred shares, shares									115	115	115
Incremental common shares attributable to $8.00 series preferred shares, shares									29	41	41
Weighted-average diluted shares outstanding, shares									16,829	16,540	16,486
Diluted EPS	$ 0.46	$ 0.67	$ 0.49	$ 0.39	$ 0.43	$ 0.74	$ 0.52	$ 0.27	$ 2.01	$ 1.96	$ 1.38