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	63,364	0	63,364	0
Other comprehensive income, net of tax	7,975	0	0	7,975
Common stock transactions:
Common shares purchased and retired 998,135 and 789,743 in 2016 and 2015, respectively	(20,548)	(20,548)	0	0
Stock Issued During Period, 16,085 and 21,414 in 2016 and 2015, respectively	0	0	0	0
Non-vested common shares issued 189,624 and 169,577 in 2016 and 2015 respectively	0	0	0	0
25,984 and 3,484 non-vested common shares forfeited in 2016 and 2015 respectively	0	0	0	0
270,183 and 158,828 stock options exercised, net of 94,902 and 58,996 shares tendered in payment of option price and income tax withholding amounts in 2016 and 2015 respectively	1,909	1,909	0	0
Tax benefit of stock-based compensation	979	979	0	0
Stock-based compensation expense	3,231	3,231	0	0
Cash dividends declared:
Common ($0.66 per share) in 2016 and ($0.60 per share) in 2015	(27,259)	0	(27,259)	0
Ending Balance at Sep. 30, 2015	938,575	309,167	623,967	5,441
Beginning Balance at Dec. 31, 2015	950,493	311,720	638,367	406
Comprehensive income:
Net income	70,871	0	70,871	0
Other comprehensive income, net of tax	8,416	0	0	8,416
Common stock transactions:
Common shares purchased and retired 998,135 and 789,743 in 2016 and 2015, respectively	(26,119)	(26,119)	0	0
Stock Issued During Period, 16,085 and 21,414 in 2016 and 2015, respectively	0	0	0	0
Non-vested common shares issued 189,624 and 169,577 in 2016 and 2015 respectively	0	0	0	0
25,984 and 3,484 non-vested common shares forfeited in 2016 and 2015 respectively	0	0	0	0
270,183 and 158,828 stock options exercised, net of 94,902 and 58,996 shares tendered in payment of option price and income tax withholding amounts in 2016 and 2015 respectively	3,657	3,657	0	0
Tax benefit of stock-based compensation	1,352	1,352	0	0
Stock-based compensation expense	3,350	3,350	0	0
Cash dividends declared:
Common ($0.66 per share) in 2016 and ($0.60 per share) in 2015	(29,516)	0	(29,516)	0
Ending Balance at Sep. 30, 2016	$ 982,504	$ 293,960	$ 679,722	$ 8,822