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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 [Member]
Balance at beginning of period at Dec. 31, 2015   $ 31,194 $ 87,268 $ 535,521 $ 1,527
Shares issued, Value   396 5,536    
Shares acquired and canceled, Value   (200)   (5,423)  
Tax effect of stock options     1,247    
Stock-based compensation arrangements     1,266    
Net income $ 52,054     52,054  
Dividends on common stock       (17,113)  
Net change 458       458
Balance at end of period at Sep. 30, 2016 693,731 31,390 95,317 565,039 1,985
Balance at beginning of period at Jun. 30, 2016   31,120 90,116 552,991 2,603
Shares issued, Value   270 3,632    
Tax effect of stock options     1,204    
Stock-based compensation arrangements     365    
Net income 17,982     17,982  
Dividends on common stock       (5,934)  
Net change (618)       (618)
Balance at end of period at Sep. 30, 2016 693,731 31,390 95,317 565,039 1,985
Balance at beginning of period at Dec. 31, 2016 711,094 31,622 101,730 577,648 94
Shares issued, Value   241 4,056    
Stock-based compensation arrangements     819    
Net income 66,942     66,942  
Dividends on common stock       (18,808)  
Net change 70       70
Balance at end of period at Sep. 30, 2017 764,414 31,863 106,605 625,782 164
Balance at beginning of period at Jun. 30, 2017   31,818 105,440 610,758 446
Shares issued, Value   45 811    
Stock-based compensation arrangements     354    
Net income 21,710     21,710  
Dividends on common stock       (6,686)  
Net change (282)       (282)
Balance at end of period at Sep. 30, 2017 $ 764,414 $ 31,863 $ 106,605 $ 625,782 $ 164