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	42,470	0	42,470	0
Other comprehensive income, net of tax	10,401	0	0	10,401
Common stock transactions:
Common shares purchased and retired 588,409 and 349,930 in 2015 and 2014, respectively	(8,764)	(8,764)	0	0
Stock Issued During Period, 21,414 and 24,581 in 2015 and 2014, respectively	0	0	0	0
Non-vested common shares issued 156,956 and 147,876 in 2015 and 2014 respectively	0	0	0	0
1,678 and 8,647 non-vested common shares forfeited in 2015 and 2014 respectively	0	0	0	0
129,885 and 286,069 stock options exercised, net of 37,357 and 160,377 shares tendered in payment of option price and income tax withholding amounts in 2015 and 2014 respectively	3,547	3,547	0	0
Tax benefit of stock-based compensation	1,225	1,225	0	0
Stock-based compensation expense	2,154	2,154	0	0
Cash dividends declared:
Common ($0.40 per share) in 2015 and ($0.32 per share) in 2014	(14,088)	0	(14,088)	0
Ending Balance at Jun. 30, 2014	838,526	283,697	560,469	(5,640)
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 588,409 and 349,930 in 2015 and 2014, respectively	(15,264)	(15,264)	0	0
Stock Issued During Period, 21,414 and 24,581 in 2015 and 2014, respectively	0	0	0	0
Non-vested common shares issued 156,956 and 147,876 in 2015 and 2014 respectively	0	0	0	0
1,678 and 8,647 non-vested common shares forfeited in 2015 and 2014 respectively	0	0	0	0
129,885 and 286,069 stock options exercised, net of 37,357 and 160,377 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)