Per Share Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Basic Earnings per Share:
NET INCOME	$ 15,271	$ 15,067	$ 11,097	$ 11,813	$ 30,338	$ 22,910
Weighted Average Shares Outstanding (in shares)	24,992,238		22,968,178		24,982,107	22,954,367
Basic Earnings per Share (USD per share)	$ 0.61		$ 0.48		$ 1.21	$ 1.00
Diluted Earnings per Share:
NET INCOME	$ 15,271	$ 15,067	$ 11,097	$ 11,813	$ 30,338	$ 22,910
Weighted Average Shares Outstanding (in shares)	24,992,238		22,968,178		24,982,107	22,954,367
Potentially Dilutive Shares, Net (in shares)	0		0		0	0
Diluted Weighted Average Shares Outstanding (in shares)	24,992,238		22,968,178		24,982,107	22,954,367
Diluted Earnings per Share (USD per share)	$ 0.61		$ 0.48		$ 1.21	$ 1.00
Anti-dilutive securities excluded from computation of earnings per share (in shares)	0		0		0	0