Consolidated Statements of Changes in Stockholders Equity (Unaudited) - USD ($) $ in Thousands	Total	Common stock	Retained earnings	Accumulated other comprehensive income
Beginning Balance at Dec. 31, 2014	$ 908,924	$ 323,596	$ 587,862	$ (2,534)
Comprehensive income:
Net income	43,202	0	43,202	0
Other comprehensive income, net of tax	1,389	0	0	1,389
Common stock transactions:
Common shares purchased and retired 789,743 and 387,967 in 2015 and 2014, respectively	(15,264)	(15,264)	0	0
Stock Issued During Period, 21,414 and 1,402,811 in 2015 and 2014, respectively	0	0	0	0
Non-vested common shares issued 169,577 and 147,876 in 2015 and 2014 respectively	0	0	0	0
6,484 and 17,741 non-vested common shares forfeited in 2015 and 2014 respectively	0	0	0	0
158,828 and 372,880 stock options exercised, net of 58,996 and 166,780 shares tendered in payment of option price and income tax withholding amounts in 2015 and 2014 respectively	1,670	1,670	0	0
Tax benefit of stock-based compensation	804	804	0	0
Stock-based compensation expense	2,319	2,319	0	0
Cash dividends declared:
Common ($0.40 per share) in 2015 and ($0.32 per share) in 2014	(18,189)	0	(18,189)	0
Ending Balance at Jun. 30, 2015	924,855	313,125	612,875	(1,145)
Beginning Balance at Dec. 31, 2015	950,493	311,720	638,367	406
Comprehensive income:
Net income	45,678	0	45,678	0
Other comprehensive income, net of tax	10,016	0	0	10,016
Common stock transactions:
Common shares purchased and retired 789,743 and 387,967 in 2015 and 2014, respectively	(26,042)	(26,042)	0	0
Stock Issued During Period, 21,414 and 1,402,811 in 2015 and 2014, respectively	0	0	0	0
Non-vested common shares issued 169,577 and 147,876 in 2015 and 2014 respectively	0	0	0	0
6,484 and 17,741 non-vested common shares forfeited in 2015 and 2014 respectively	0	0	0	0
158,828 and 372,880 stock options exercised, net of 58,996 and 166,780 shares tendered in payment of option price and income tax withholding amounts in 2015 and 2014 respectively	1,684	1,684	0	0
Tax benefit of stock-based compensation	619	619	0	0
Stock-based compensation expense	2,385	2,385	0	0
Cash dividends declared:
Common ($0.40 per share) in 2015 and ($0.32 per share) in 2014	(19,708)	0	(19,708)	0
Ending Balance at Jun. 30, 2016	$ 965,125	$ 290,366	$ 664,337	$ 10,422