Employee Benefit Plans - Stock Transactions - Stock Option Plans (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Shares
Options Outstanding, beginning shares			614,311
Options granted, shares			101,000	55,000
Options exercised, shares	(49,111)	(32,000)	(54,611)	(52,434)
Options forfeited, shares			(9,999)
Options Outstanding, ending shares	650,701		650,701		614,311
Shares Exercisable	387,870		387,870
Weighted average exercise price
Weighted average exercise price, Options Outstanding, beginning (in dollars per share)			$ 14.78
Weighted average exercise price, Options granted (in dollars per share)			20.39	$ 20.61
Weighted average exercise price, Options exercised (in dollars per share)			7.24
Weighted average exercise price, Options forfeited (in dollars per share)			20.79
Weighted average exercise price, Options Outstanding, ending (in dollars per share)	$ 16.19		16.19		$ 14.78
Weighted average exercise price, Options Exercisable (in dollars per share)	$ 13.21		$ 13.21
Weighted average remaining contractual life , Options Outstanding			7 years		6 years 10 months 24 days
Weighted average remaining contractual life, Options exercisable			5 years 8 months 12 days
Aggregate intrinsic value: Options Outstanding	$ 1,235,282		$ 1,235,282		$ 4,783,402
Aggregate intrinsic value, Options exercisable	$ 1,235,282		$ 1,235,282