Stock Based Compensation (Summary of Stock Option Activity) (Details) - $ / shares	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Shares
Options outstanding, beginning of year (in shares)	355,218
Exercised (in shares)	(6,500)	(12,300)
Options outstanding, end of year (in shares)	348,718		355,218
Options Exercisable (in shares)	338,716
Weighted Average Exercise Price
Options outstanding, beginning of year (in dollars per share)	$ 16.63
Exercised (in dollars per share)	9.46
Options outstanding, end of year (in dollars per share)	16.76		$ 16.63
Options exercisable (in dollars per share)	$ 16.52
Weighted Average Remaining Contractual Term
Options outstanding	4 years 9 months 1 day		4 years 12 months 1 day
Options exercisable	4 years 8 months 1 day