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	20,980	0	20,980	0
Other comprehensive income, net of tax	6,713	0	0	6,713
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
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	900	900	0	0
Tax benefit of stock-based compensation	480	480	0	0
Stock-based compensation expense	832	832	0	0
Cash dividends declared:
Common ($0.40 per share) in 2015 and ($0.32 per share) in 2014	(9,115)	0	(9,115)	0
Ending Balance at Mar. 31, 2015	914,450	310,544	599,727	4,179
Beginning Balance at Dec. 31, 2015	950,493	311,720	638,367	406
Comprehensive income:
Net income	20,124	0	20,124	0
Other comprehensive income, net of tax	4,195	0	0	4,195
Common stock transactions:
Common shares purchased and retired 789,743 and 387,967 in 2015 and 2014, respectively	(25,309)	(25,309)	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	996	996	0	0
Tax benefit of stock-based compensation	420	420	0	0
Stock-based compensation expense	955	955	0	0
Cash dividends declared:
Common ($0.40 per share) in 2015 and ($0.32 per share) in 2014	(9,860)	0	(9,860)	0
Ending Balance at Mar. 31, 2016	$ 942,014	$ 288,782	$ 648,631	$ 4,601