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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) - USD ($)
$ in Thousands
Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Total
Balance at Dec. 31, 2014 $ 11,250 $ 374,287 $ 6,015 $ 72,398 $ (16,717) $ (1,014) $ 446,219
Net income 20,901 20,901
Other comprehensive loss, net of tax (716) (716)
Dividend on series B preferred stock (56) (56)
Cash dividends declared on common stock ($0.15 per share) (4,471) (4,471)
Exercise of stock options 1,379 1,379
Restricted stock and performance units grants
Stock-based compensation expense 726 726
Balance at Jun. 30, 2015 11,250 374,287 8,120 88,772 (16,717) (1,730) 463,982
Balance at Dec. 31, 2015 11,250 374,287 8,527 104,606 (16,717) (4,609) 477,344
Net income 21,250   21,250
Other comprehensive loss, net of tax   288 288
Dividend on series B preferred stock (22) (22)
Cash dividends declared on common stock ($0.15 per share) (4,533) (4,533)
Redemption of preferred stock (11,250) (11,250)
Exercise of stock options 232 232
Restricted stock and performance units grants    
Stock-based compensation expense 1,105 1,105
Balance at Jun. 30, 2016 $ 374,287 $ 9,864 $ 121,301 $ (16,717) $ (4,321) $ 484,414