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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Basic:        
Net Income $ 11,119 $ 12,290 $ 25,818 $ 25,459
Preferred Dividend (30) (36) (102) (108)
Earnings Applicable to Common Stock $ 11,089 $ 12,254 $ 25,716 $ 25,351
Basic EPS $ 0.67 $ 0.75 $ 1.56 $ 1.55
Weighted average number of basic shares outstanding 16,610 16,394 16,520 16,379
Diluted:        
Adjusted Earnings Applicable to Common Stock $ 11,106 $ 12,277 $ 25,778 $ 25,419
Diluted EPS $ 0.66 $ 0.74 $ 1.55 $ 1.54
Weighted average number of diluted shares outstanding 16,757 16,550 16,673 16,535
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 $ 12 $ 18
Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock (in shares) 32 41 38 41