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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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Basic:                      
Net Income $ 4,560 $ 6,743 $ 5,089 $ 3,636 $ 3,790 $ 6,758 $ 4,728 $ 3,169 $ 20,028 $ 18,445 $ 16,633
Preferred Dividend                 (144) (151) (190)
Earnings Applicable to Common Stock                 $ 19,884 $ 18,294 $ 16,443
Weighted-average number of basic shares outstanding, shares                 16,175 16,052 15,868
Basic EPS $ 0.29 $ 0.41 $ 0.31 $ 0.22 $ 0.23 $ 0.42 $ 0.29 $ 0.20 $ 1.23 $ 1.14 $ 1.04
Diluted:                      
$7.00 Series Preferred Dividend                 $ 67 $ 74 $ 97
$8.00 Series Preferred Dividend                 24 24 40
Adjusted Earnings Applicable to Common Stock                 $ 19,975 $ 18,392 $ 16,580
Incremental common shares attributable to $7.00 series preferred shares, shares                 115 133 166
Incremental common shares attributable to $8.00 series preferred shares, shares                 41 41 76
Weighted-average diluted shares outstanding, shares                 16,331 16,226 16,110
Diluted EPS $ 0.28 $ 0.41 $ 0.31 $ 0.22 $ 0.22 $ 0.42 $ 0.29 $ 0.20 $ 1.22 $ 1.13 $ 1.03