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, 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 998,135 and 789,743 in 2016 and 2015, respectively	(25,309)	(25,309)	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	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 ($0.66 per share) in 2016 and ($0.60 per share) in 2015	(9,860)	0	(9,860)	0
Ending Balance at Mar. 31, 2016	942,014	288,782	648,631	4,601
Beginning Balance at Dec. 31, 2016	982,593	296,071	694,650	(8,128)
Comprehensive income:
Net income	23,126	0	23,126	0
Other comprehensive income, net of tax	5,535	0	0	5,535
Common stock transactions:
Common shares purchased and retired 998,135 and 789,743 in 2016 and 2015, respectively	(859)	(859)	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	1,084	1,084	0	0
Stock-based compensation expense	877	877	0	0
Cash dividends declared:
Common ($0.66 per share) in 2016 and ($0.60 per share) in 2015	(10,760)	0	(10,760)	0
Ending Balance at Mar. 31, 2017	$ 1,001,596	$ 297,173	$ 707,016	$ (2,593)