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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Basic:        
Net Income $ 12,290 $ 7,642 $ 25,459 $ 17,463
Preferred Dividend (36) (36) (108) (108)
Earnings Applicable to Common Stock $ 12,254 $ 7,606 $ 25,351 $ 17,355
Basic EPS $ 0.75 $ 0.47 $ 1.55 $ 1.06
Weighted average number of basic shares outstanding 16,394 16,340 16,379 16,324
Diluted:        
Adjusted Earnings Applicable to Common Stock $ 12,277 $ 7,629 $ 25,419 $ 17,423
Diluted EPS $ 0.74 $ 0.46 $ 1.54 $ 1.06
Weighted average number of diluted shares outstanding 16,550 16,496 16,535 16,480
Convertible Preferred Stock $7.00 Series [Member]        
Diluted:        
Preferred Dividend $ 17 $ 17 $ 50 $ 50
Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock (in shares) 115 115 115 115
Convertible Preferred Stock $8.00 Series [Member]        
Diluted:        
Preferred Dividend $ 6 $ 6 $ 18 $ 18
Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock (in shares) 41 41 41 41