Earnings Per Common Share (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Shares
Basic earnings per share (in shares)	8,698,014	8,641,717	8,611,507
Effect of dilutive securities - stock options (in shares)	10,448	18,911	9,734
Diluted earnings per share (in shares)	8,708,462	8,660,628	8,621,241
Per Share Amount
Basic earnings per share (in dollars per share)	$ 2.60	$ 1.76	$ 1.89
Effect of dilutive securities - stock options (in dollars per share)	(0.01)	0.00	0.00
Diluted earnings per share (in dollars per share)	$ 2.59	$ 1.76	$ 1.89
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options on common stock not included in computing diluted earnings per share (in shares)	0	330	11,397