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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Earnings Per Share [Abstract]        
Distributed earnings allocated to common shares $ 296 $ 246 $ 566 $ 467
Undistributed earnings allocated to common shares 1,723 1,499 2,861 2,548
Net earnings allocated to common shares 2,019 1,745 3,427 3,015
Net earnings allocated to participating securities 2 2 5 3
Dividends on convertible preferred shares 244 244 488 469
Net Income allocated to common shares and participating securities $ 2,265 $ 1,991 $ 3,920 $ 3,487
Weighted average shares outstanding for basic earnings per share 4,893 4,884 4,894 4,882
Dilutive effect of stock compensation 45 47 50 48
Dilutive effect of convertible shares 1,452 1,451 1,452 1,451
Weighted average shares outstanding for diluted earnings per share 6,390 6,382 6,396 6,381
Basic earnings per common share $ 0.41 $ 0.36 $ 0.70 $ 0.62
Diluted earnings per common share $ 0.35 $ 0.31 $ 0.61 $ 0.54