Per Share Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Basic Earnings per Share:
Net Income	$ 15,820	$ 13,064	$ 15,271	$ 15,067	$ 10,980	$ 12,639	$ 11,097	$ 11,813	$ 59,222	$ 46,529	$ 40,676
Weighted Average Shares Outstanding (in shares)									25,824,538	23,381,616	22,924,726
Basic Earnings per Share (in USD per share)	$ 0.59	$ 0.49	$ 0.61	$ 0.60	$ 0.44	$ 0.55	$ 0.48	$ 0.51	$ 2.29	$ 1.99	$ 1.77
Diluted Earnings per Share:
Net Income	$ 15,820	$ 13,064	$ 15,271	$ 15,067	$ 10,980	$ 12,639	$ 11,097	$ 11,813	$ 59,222	$ 46,529	$ 40,676
Weighted Average Shares Outstanding (in shares)									25,824,538	23,381,616	22,924,726
Stock Options, Net (in shares)									0	0	0
Diluted Weighted Average Shares Outstanding (in shares)									25,824,538	23,381,616	22,924,726
Diluted Earnings per Share (in USD per share)	$ 0.59	$ 0.49	$ 0.61	$ 0.60	$ 0.44	$ 0.55	$ 0.48	$ 0.51	$ 2.29	$ 1.99	$ 1.77
Antidilutive securities excluded from computation of earnings per share (in shares)									0	0	0
Stock options outstanding (in shares)	0				0				0	0	0