Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Net income	$ 101,928	$ 80,245	$ 57,804
Average common shares:
Basic (weighted-average outstanding shares) (in shares)	11,877,000	11,837,000	11,782,000
Dilutive potential common shares from stock options (in shares)	57,000	59,000	63,000
Diluted (weighted-average outstanding shares) (in shares)	11,934,000	11,896,000	11,845,000
Basic earnings per share (in dollars per share)	$ 8.58	$ 6.78	$ 4.91
Diluted earnings per share (in dollars per share)	$ 8.54	$ 6.75	$ 4.88
Stock options excluded from diluted earnings per share calculation (in shares)	25,610	15,586	9,864