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Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings per share basic and diluted [Abstract]
Net income applicable to common stock	$ 4,846	$ 4,691	$ 9,251	$ 8,938
Basic earnings per share computation [Abstract]
Weighted average common shares outstanding (in shares)	3,523,135	3,541,703	3,525,788	3,544,343
Earnings per share - basic (in dollars per share)	$ 1.38	$ 1.32	$ 2.62	$ 2.52
Diluted earnings per share computation [Abstract]
Weighted average common shares outstanding for basic earnings per share (in shares)	3,523,135	3,541,703	3,525,788	3,544,343
Add: Dilutive effects of restricted stock (in shares)	1,382	1,467	695	631
Weighted average common shares outstanding for dilutive earnings per share (in shares)	3,524,517	3,543,170	3,526,483	3,544,974
Earnings per share - diluted (in dollars per share)	$ 1.38	$ 1.32	$ 2.62	$ 2.52
Restricted Stock [Member]
Antidilutive Securities [Abstract]
Antidilutive restricted stock excluded from net income per share calculations (in shares)	5,343	465	5,343	3,349
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	$ 61.04	$ 62.93	$ 61.04

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