Earnings Per Common Share (Computation of Basic and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Common Share [Abstract]
Net income available to common stockholders, Income									$ 10,684	$ 7,946
Income available to common stockholders after assumed exercises, Income									$ 10,684	$ 7,946
Net income available to common stockholders, Shares									4,303,410	4,260,137
Effect of potential dilutive common stock equivalents– stock options and restricted shares, Shares									12,000	30,000
Income available to common stockholders after assumed exercises, Shares									4,315,324	4,290,070
Net income available to common stockholders, Amount	$ 0.70	$ 0.70	$ 0.48	$ 0.61	$ 0.19	$ 0.57	$ 0.54	$ 0.57	$ 2.48	$ 1.87
Effect of potential dilutive common stock equivalents– stock options and restricted shares, Amount										(0.02)
Income available to common stockholders after assumed exercises, Amount	$ 0.69	$ 0.70	$ 0.47	$ 0.61	$ 0.19	$ 0.56	$ 0.53	$ 0.57	$ 2.48	$ 1.85