Consolidated Statement of Changes in Stockholders' Equity (Unaudited) - 6 months ended Jun. 30, 2015 - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance, Value at Dec. 31, 2014	$ 119,573	$ 779	$ 59,740	$ 65,576	$ (6,522)
Beginning Balance, Shares at Dec. 31, 2014	77,893,144	77,893,144
Share-based compensation recognized	$ 2,191		2,191
Repurchase of common stock	(9,991)	$ (5)	(9,986)
Repurchase of common stock, Shares		(452,175)
Restricted stock grants and units delivered, net of cashless	(30)	$ 1	(31)
Restricted stock grants and units delivered, net of cashless, shares		46,964
Net income	39,330			39,330
Cash dividends declared on common stock	(15,559)			(15,559)
Other comprehensive income	802				802
Ending Balance, Value at Jun. 30, 2015	$ 136,316	$ 775	$ 51,914	$ 89,347	$ (5,720)
Ending Balance, Shares at Jun. 30, 2015	77,487,933	77,487,933