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Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
COMMON STOCK [Member]
CAPITAL SURPLUS [Member]
RETAINED EARNINGS [Member]
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) [Member]
Balance at beginning of period at Dec. 31, 2018   $ 32,604 $ 149,709 $ 722,615 $ (2,139)
Shares issued for stock options   14 312    
Net income $ 31,837     31,837  
Dividends on common stock       (9,739)  
Stock-based compensation arrangements     174    
Net change         2,540
Balance at end of period at Mar. 31, 2019 927,927 32,618 150,195 744,713 401
Balance at beginning of period at Dec. 31, 2019 1,004,989 32,694 153,353 815,488 3,454
Shares issued for stock options   12 220    
Shares acquired and canceled   (59)   (3,039)  
Net income 22,608     22,608  
Cumulative effect of change in accounting principle, net of tax of $925 (Note 1)       2,270  
Dividends on common stock       (10,472)  
Stock-based compensation arrangements     426    
Net change         6,425
Balance at end of period at Mar. 31, 2020 $ 1,023,380 $ 32,647 $ 153,999 $ 826,855 $ 9,879