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EARNINGS PER SHARE - Earnings Per Share, Basic and Diluted (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
EARNINGS PER SHARE        
Average common shares outstanding (in shares) 11,656 11,935 11,688 12,055
Net income $ 16,490 $ 15,879 $ 46,885 $ 54,655
Per common share amount $ 1.41 $ 1.33 $ 4.01 $ 4.53
Average common shares outstanding (in shares) 11,656 11,935 11,688 12,055
Net effect of dilutive stock options - based on the treasury stock method using average market price (in shares) 63 42 58 49
Diluted common shares (in shares) 11,719 11,977 11,746 12,104
Net income $ 16,490 $ 15,879 $ 46,885 $ 54,655
Per common share amount $ 1.41 $ 1.33 $ 3.99 $ 4.52