Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings per share basic and diluted [Abstract]
Net income applicable to common stock	$ 8,007	$ 5,196	$ 17,876	$ 14,447
Basic earnings per share computation [Abstract]
Weighted average common shares outstanding (in shares)	3,918,438	3,553,996	3,769,705	3,560,695
Earnings per share - basic (in dollars per share)	$ 2.04	$ 1.46	$ 4.74	$ 4.06
Diluted earnings per share computation [Abstract]
Weighted average common shares outstanding for basic earnings per share (in shares)	3,918,438	3,553,996	3,769,705	3,560,695
Add: Dilutive effects of restricted stock (in shares)	0	0	2,025	2,280
Weighted average common shares outstanding for dilutive earnings per share (in shares)	3,918,438	3,553,996	3,771,730	3,562,975
Earnings per share - diluted (in dollars per share)	$ 2.04	$ 1.46	$ 4.74	$ 4.05
Restricted Stock [Member]
Antidilutive Securities [Abstract]
Antidilutive restricted stock excluded from net income per share calculations (in shares)	9,480	9,013	5,347	4,453
Restricted Stock [Member] | Minimum [Member]
Antidilutive Securities [Abstract]
Antidilutive stock share price range (in dollars per share)	$ 51.14	$ 50.65	$ 58.37	$ 50.65
Restricted Stock [Member] | Maximum [Member]
Antidilutive Securities [Abstract]
Antidilutive stock share price range (in dollars per share)	$ 62.93	$ 62.93	$ 62.93	$ 62.93