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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY - USD ($)
$ in Thousands
Voting
Common Stock
Series A Nonvoting
Common Stock
Surplus
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Total
Balance at Dec. 31, 2018 $ 3 $ 178 $ 32,288 $ 315,234 $ (4,288) $ (3,019) $ 340,396
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income       50,778     50,778
Other comprehensive income         12,719   12,719
Cash dividends       (54,957)     (54,957)
Balance at Sep. 30, 2019 3 178 32,288 311,055 8,431 (3,019) 348,936
Balance at Jun. 30, 2019 3 178 32,288 302,984 7,436 (3,019) 339,870
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income       17,437     17,437
Other comprehensive income         995   995
Cash dividends       (9,366)     (9,366)
Balance at Sep. 30, 2019 3 $ 178 32,288 311,055 8,431 $ (3,019) 348,936
Balance at Dec. 31, 2019 275   190,524 134,287 7,832   332,918
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income       24,203     24,203
Other comprehensive income         10,299   10,299
Stock-based compensation     263       263
Cash dividends       (12,389)     (12,389)
Balance at Sep. 30, 2020 275   190,787 146,101 18,131   355,294
Balance at Jun. 30, 2020 275   190,687 139,667 17,211   347,840
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income       10,563     10,563
Other comprehensive income         920   920
Stock-based compensation     100       100
Cash dividends       (4,129)     (4,129)
Balance at Sep. 30, 2020 $ 275   $ 190,787 $ 146,101 $ 18,131   $ 355,294