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Capitalization (Schedule of Earnings Per Share) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Basic:                      
Net Income $ 5,345 $ 7,642 $ 5,381 $ 4,441 $ 3,220 $ 8,813 $ 5,919 $ 4,790 $ 22,809 $ 22,742 $ 20,028
Preferred Dividend                 (144) (144) (144)
Earnings Applicable to Common Stock                 $ 22,665 $ 22,598 $ 19,884
Weighted-average number of basic shares outstanding, shares                 16,330,000 16,270,000 16,175,000
Basic EPS $ 0.32 $ 0.47 $ 0.33 $ 0.27 $ 0.20 $ 0.54 $ 0.36 $ 0.29 $ 1.39 $ 1.39 $ 1.23
Diluted:                      
$7.00 Series Preferred Dividend                 $ 67 $ 67 $ 67
$8.00 Series Preferred Dividend                 24 24 24
Adjusted Earnings Applicable to Common Stock                 $ 22,756 $ 22,689 $ 19,975
Incremental common shares attributable to $7.00 series preferred shares, shares                 115,000 115,000 115,000
Incremental common shares attributable to $8.00 series preferred shares, shares                 41,000 41,000 41,000
Weighted-average diluted shares outstanding, shares                 16,486,000 16,426,000 16,331,000
Diluted EPS $ 0.32 $ 0.46 $ 0.33 $ 0.27 $ 0.19 $ 0.54 $ 0.36 $ 0.29 $ 1.38 $ 1.38 $ 1.22