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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share [Abstract]                      
Net income $ 8,080 $ 20,033 $ 12,989 $ 15,528 $ 9,568 $ 17,418 $ 20,667 $ 15,253 $ 56,630 $ 62,906 $ 73,486
Average common shares:                      
Basic (weighted-average outstanding shares) (in shares)                 11,782,000 11,729,000 11,660,000
Dilutive potential common shares from stock options (in shares)                 63,000 71,000 101,000
Diluted (weighted-average outstanding shares) (in shares) 11,859,000 11,851,000 11,842,000 11,827,000 11,811,000 11,813,000 11,798,000 11,777,000 11,845,000 11,800,000 11,761,000
Basic earnings per share (in dollars per share)                 $ 4.81 $ 5.36 $ 6.30
Diluted earnings per share (in dollars per share) $ 0.68 $ 1.69 $ 1.10 $ 1.31 $ 0.81 $ 1.47 $ 1.75 $ 1.30 $ 4.78 $ 5.33 $ 6.25
Stock options excluded from diluted earnings per share calculation (in shares)                 9,864 4,244 4,850