Per Share Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Basic Earnings per Share:
NET INCOME	$ 21,486	$ 23,822	$ 19,557	$ 14,593	$ 14,255	$ 12,472	$ 64,865	$ 41,320
Weighted Average Shares Outstanding (in shares)	26,545,868			26,497,398			26,534,044	26,554,369
Basic Earnings per Share (USD per share)	$ 0.81			$ 0.55			$ 2.44	$ 1.56
Diluted Earnings per Share:
NET INCOME	$ 21,486	$ 23,822	$ 19,557	$ 14,593	$ 14,255	$ 12,472	$ 64,865	$ 41,320
Weighted Average Shares Outstanding (in shares)	26,545,868			26,497,398			26,534,044	26,554,369
Potentially Dilutive Shares, Net (in shares)	0			0			0	0
Diluted Weighted Average Shares Outstanding (in shares)	26,545,868			26,497,398			26,534,044	26,554,369
Diluted Earnings per Share (USD per share)	$ 0.81			$ 0.55			$ 2.44	$ 1.56
Anti-dilutive securities excluded from computation of earnings per share (in shares)	0			0			0	0