Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings per share basic and diluted [Abstract]
Net income applicable to common stock	$ 5,196	$ 4,581	$ 14,447	$ 13,519
Basic earnings per share computation [Abstract]
Weighted average common shares outstanding (in shares)	3,515,678	3,537,315	3,522,377	3,541,971
Earnings per share - basic (in dollars per share)	$ 1.48	$ 1.30	$ 4.10	$ 3.82
Diluted earnings per share computation [Abstract]
Weighted average common shares outstanding for basic earnings per share (in shares)	3,515,678	3,537,315	3,522,377	3,541,971
Add: Dilutive effects of restricted stock (in shares)	0	161	2,280	2,161
Weighted average common shares outstanding for dilutive earnings per share (in shares)	3,515,678	3,537,476	3,524,657	3,544,132
Earnings per share - diluted (in dollars per share)	$ 1.48	$ 1.30	$ 4.10	$ 3.81
Restricted Stock [Member]
Antidilutive Securities [Abstract]
Antidilutive restricted stock excluded from net income per share calculations (in shares)	9,013	4,696	4,453	4,033
Restricted Stock [Member] | Minimum [Member]
Antidilutive Securities [Abstract]
Antidilutive stock share price range (in dollars per share)	$ 50.65	$ 46.69	$ 50.65	$ 46.69
Restricted Stock [Member] | Maximum [Member]
Antidilutive Securities [Abstract]
Antidilutive stock share price range (in dollars per share)	$ 62.93	$ 62.93	$ 62.93	$ 61.04