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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, 2014   $ 15,504 $ 96,841 $ 492,776 $ 4,193
Shares issued, Value   8 236    
Net income $ 16,259     16,259  
Net change 739       739
Tax effect of stock options     (64)    
Dividends on common stock       (5,277)  
Stock-based compensation arrangements     464    
Balance at end of period at Mar. 31, 2015 621,679 15,512 97,477 503,758 4,932
Balance at beginning of period at Dec. 31, 2015 655,510 15,597 102,865 535,521 1,527
Shares issued, Value   31 871    
Net income 16,579     16,579  
Net change 530       530
Tax effect of stock options     (209)    
Dividends on common stock       (5,579)  
Stock-based compensation arrangements     451    
Shares acquired and canceled, Value   (100)   (5,423)  
Balance at end of period at Mar. 31, 2016 $ 662,661 $ 15,528 $ 103,978 $ 541,098 $ 2,057