Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings per share basic and diluted [Abstract]
Net income applicable to common stock	$ 4,531	$ 4,405
Basic earnings per share computation [Abstract]
Weighted average common shares outstanding (in shares)	3,515,500	3,528,466
Earnings per share - basic (in dollars per share)	$ 1.29	$ 1.25
Diluted earnings per share computation [Abstract]
Weighted average common shares outstanding for basic earnings per share (in shares)	3,515,500	3,528,466
Add: Dilutive effects of restricted stock (in shares)	0	0
Weighted average common shares outstanding for dilutive earnings per share (in shares)	3,515,500	3,528,466
Earnings per share - diluted (in dollars per share)	$ 1.29	$ 1.25
Restricted Stock [Member]
Antidilutive Securities [Abstract]
Antidilutive restricted stock excluded from net income per share calculations (in shares)	7,564	6,705
Restricted Stock [Member] | Minimum [Member]
Antidilutive Securities [Abstract]
Antidilutive stock share price range (in dollars per share)	$ 52.44	$ 47.81
Restricted Stock [Member] | Maximum [Member]
Antidilutive Securities [Abstract]
Antidilutive stock share price range (in dollars per share)	$ 62.93	$ 62.93