Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Common Stock [Member]
AOCI Attributable to Parent [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Total
Balance at Dec. 31, 2012 $ 4 $ 2,597 $ 257,041 $ 692 $ 260,334
Balance (in Shares) at Dec. 31, 2012 41,739,569        
Cash dividends       (29,904) (29,904)
Proceeds from the issuance of stock     19,247   19,247
Proceeds from the issuance of stock (in Shares) 1,603,261        
Excess income tax benefits from exercise of stock options     40   40
Other comprehensive income   4,839     4,839
Net income       74,034 74,034
Balance at Dec. 31, 2013 $ 4 7,436 276,328 44,822 328,590
Balance (in Shares) at Dec. 31, 2013 43,342,830        
Cash dividends       (20,928) (20,928)
Stock based compensation     1,440   1,440
Stock based compensation (in Shares) 379,558        
Excess income tax benefits from exercise of stock options     59   59
Minimum tax withholdings on options and awards     (175)   (175)
Minimum tax withholdings on options and awards (in Shares) 379,558        
Other comprehensive income   (3,177)     (3,177)
Net income       53,200 53,200
Balance at Dec. 31, 2014 $ 4 4,259 277,652 77,094 359,009
Balance (in Shares) at Dec. 31, 2014 43,722,388        
Cash dividends       (10,493) (10,493)
Stock based compensation     2,043   2,043
Stock based compensation (in Shares) (6,556)        
Excess income tax benefits from exercise of stock options     (344)   (344)
Minimum tax withholdings on options and awards     (120)   (120)
Minimum tax withholdings on options and awards (in Shares) (6,556)        
Other comprehensive income   (2,204)     (2,204)
Net income       46,421 46,421
Balance at Dec. 31, 2015 $ 4 $ 2,055 $ 279,231 $ 113,022 $ 394,312
Balance (in Shares) at Dec. 31, 2015 43,715,832