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Earnings Per Share (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
Earnings Per Share [Abstract]
Net income	$ 9,568	$ 17,418	$ 20,667	$ 15,253	$ 16,589	$ 23,543	$ 18,771	$ 14,583	$ 62,906	$ 73,486	$ 44,315
Average common shares:
Basic (weighted-average outstanding shares) (in shares)									11,729,000	11,660,000	11,549,000
Dilutive potential common shares from stock options (in shares)									71,000	101,000	133,000
Diluted (weighted-average outstanding shares) (in shares)	11,811,000	11,813,000	11,798,000	11,777,000	11,768,000	11,777,000	11,759,000	11,739,000	11,800,000	11,761,000	11,682,000
Basic earnings per share (in dollars per share)									$ 5.36	$ 6.30	$ 3.84
Diluted earnings per share (in dollars per share)	$ 0.81	$ 1.47	$ 1.75	$ 1.30	$ 1.41	$ 2.00	$ 1.60	$ 1.24	$ 5.33	$ 6.25	$ 3.79
Stock options excluded from diluted earnings per share calculation (in shares)									4,244	4,850	1,565

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