v3.22.2.2
Income and Dividends Per Share of Common Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Anti-dilutive securities                
Common stock, authorized shares 30,000,000           30,000,000  
Common stock, shares outstanding 5,673,574           5,673,574  
Income per share of common stock:                
Net income for basic and diluted income per common share $ 15,726 $ 10,238 $ 8,668 $ 11,308 $ 11,093 $ 7,031 $ 34,632 $ 29,432
Weighted-average shares for basic income per common share (in shares) 5,674,000     5,658,000     5,671,000 5,656,000
Effect of dilutive securities:                
Employee and director stock options (in shares) 6,000     13,000     8,000 12,000
Adjusted weighted-average shares and assumed exercises for diluted income per common share (in shares) 5,680,000     5,671,000     5,679,000 5,668,000
Basic net income per common share (in dollars per share) $ 2.77     $ 2.00     $ 6.11 $ 5.20
Diluted net income per common share (in dollars per share) 2.77     1.99     6.10 5.19
Cash dividends per share of common stock (in dollars per share) $ 0.20     $ 0.16     $ 0.60 $ 0.48
Options                
Anti-dilutive securities                
Anti-dilutive shares of common stock excluded from the calculation of dilutive securities 20,000     0     16,000 0