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Capitalization (Schedule of Earnings Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Basic:                      
Net Income $ 7,237 $ 11,476 $ 10,923 $ 6,907 $ 8,307 $ 12,737 $ 9,713 $ 7,668 $ 36,543 $ 38,425 $ 33,888
Preferred Dividend                 (120) (120) (132)
Earnings Applicable to Common Stock                 $ 36,423 $ 38,305 $ 33,756
Weighted-average number of basic shares outstanding, shares                 17,492 17,459 16,685
Basic EPS $ 0.42 $ 0.65 $ 0.62 $ 0.39 $ 0.47 $ 0.73 $ 0.55 $ 0.44 $ 2.08 $ 2.19 $ 2.02
Diluted:                      
$7.00 Series Preferred Dividend                 $ 67 $ 67 $ 67
$8.00 Series Preferred Dividend                 12
Adjusted Earnings Applicable to Common Stock                 $ 36,490 $ 38,372 $ 33,835
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
Weighted-average diluted shares outstanding, shares                 17,607 17,574 16,829
Diluted EPS $ 0.41 $ 0.65 $ 0.62 $ 0.39 $ 0.47 $ 0.72 $ 0.55 $ 0.44 $ 2.07 $ 2.18 $ 2.01