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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, 2013   $ 15,334 $ 88,803 $ 448,953 $ 3,907
Shares issued   65 1,620    
Net income $ 29,345     29,345  
Net change 991       991
Tax effect of stock options     248    
Dividends on common stock       (9,537)  
Stock-based compensation arrangements     776    
Balance at end of period at Jun. 30, 2014 580,505 15,399 91,447 468,761 4,898
Balance at beginning of period at Mar. 31, 2014   15,364 89,951 458,857 3,940
Shares issued   35 742    
Net income 14,688     14,688  
Net change 958       958
Tax effect of stock options     325    
Dividends on common stock       (4,784)  
Stock-based compensation arrangements     429    
Balance at end of period at Jun. 30, 2014 580,505 15,399 91,447 468,761 4,898
Balance at beginning of period at Dec. 31, 2014 609,314 15,504 96,841 492,776 4,193
Shares issued   58 1,316    
Net income 34,812     34,812  
Net change (1,741)       (1,741)
Tax effect of stock options     291    
Dividends on common stock       (10,560)  
Stock-based compensation arrangements     754    
Balance at end of period at Jun. 30, 2015 634,244 15,562 99,202 517,028 2,452
Balance at beginning of period at Mar. 31, 2015   15,512 97,477 503,758 4,932
Shares issued   50 1,080    
Net income 18,553     18,553  
Net change (2,480)       (2,480)
Tax effect of stock options     355    
Dividends on common stock       (5,283)  
Stock-based compensation arrangements     290    
Balance at end of period at Jun. 30, 2015 $ 634,244 $ 15,562 $ 99,202 $ 517,028 $ 2,452