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Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
COMMON STOCK [Member]
CAPITAL SURPLUS [Member]
RETAINED EARNINGS [Member]
RETAINED EARNINGS [Member]
CUMULATIVE EFFECT, PERIOD OF ADOPTION, ADJUSTMENT [Member]
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) [Member]
Balance at beginning of period at Dec. 31, 2019   $ 32,694 $ 153,353 $ 815,488 $ 2,270 $ 3,454
Shares issued for stock options   28 507      
Shares acquired and canceled   (59)   (3,039)    
Net income $ 43,338     $ 43,338    
Accounting Standards Update Extensible List       us-gaap:AccountingStandardsUpdate201613Member    
Dividends on common stock       $ (20,903)    
Stock-based compensation arrangements     832      
Net change           6,236
Balance at end of period at Jun. 30, 2020 1,034,199 32,663 154,692 837,154   9,690
Balance at beginning of period at Mar. 31, 2020   32,647 153,999 826,855   9,879
Shares issued for stock options   16 287      
Net income 20,730     20,730    
Dividends on common stock       (10,431)    
Stock-based compensation arrangements     406      
Net change           (189)
Balance at end of period at Jun. 30, 2020 1,034,199 32,663 154,692 837,154   9,690
Balance at beginning of period at Dec. 31, 2020 1,067,885 32,720 156,574 871,161   7,430
Shares issued for stock options   65 1,657      
Net income 90,712     90,712    
Dividends on common stock       (22,285)    
Net cash settlement of options     (958) (4,521)    
Stock-based compensation arrangements     1,049      
Net change           (2,013)
Balance at end of period at Jun. 30, 2021 1,131,591 32,785 158,322 935,067   5,417
Balance at beginning of period at Mar. 31, 2021   32,771 157,450 898,026   6,424
Shares issued for stock options   14 399      
Net income 48,192     48,192    
Dividends on common stock       (11,151)    
Stock-based compensation arrangements     473      
Net change           (1,007)
Balance at end of period at Jun. 30, 2021 $ 1,131,591 $ 32,785 $ 158,322 $ 935,067   $ 5,417