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, 2013	$ 801,581	$ 285,535	$ 532,087	$ (16,041)
Comprehensive income:
Net income	61,625	0	61,625	0
Other comprehensive income, net of tax	8,411	0	0	8,411
Common stock transactions:
Common shares purchased and retired 789,743 and 387,967 in 2015 and 2014, respectively	(9,736)	(9,736)	0	0
Stock Issued During Period, 21,414 and 1,402,811 in 2015 and 2014, respectively	35,972	35,972	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	4,914	4,914	0	0
Tax benefit of stock-based compensation	1,541	1,541	0	0
Stock-based compensation expense	2,906	2,906	0	0
Cash dividends declared:
Common ($0.40 per share) in 2015 and ($0.32 per share) in 2014	(21,350)	0	(21,350)	0
Ending Balance at Sep. 30, 2014	885,864	321,132	572,362	(7,630)
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 789,743 and 387,967 in 2015 and 2014, respectively	(20,548)	(20,548)	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	1,909	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 ($0.40 per share) in 2015 and ($0.32 per share) in 2014	(27,259)	0	(27,259)	0
Ending Balance at Sep. 30, 2015	$ 938,575	$ 309,167	$ 623,967	$ 5,441