CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income/ (Loss)	Unallocated Common Stock of ESOP
Balance at Dec. 31, 2010	$ 1,307,450	$ 1,103	$ 824,164	$ 523,089	$ (13,497)	$ (27,409)
Comprehensive income:
Net income	64,151			64,151
Other comprehensive loss, net of tax of $559, $(7,506) and $5,964 for the year ended December, 31 2013, 2012 and 2011, respectively	(9,729)				(9,729)
Total comprehensive income	54,422			64,151	(9,729)
Exercise of stock options	2,030	3	2,027
Share repurchases	(172,690)	(144)	(172,546)
Stock-based compensation expense including tax benefits of $635, $403 and $610 for the year ended December, 31 2013, 2012 and 2011, respectively	7,334	13	5,878			1,443
Dividends paid ($0.50, $0.60, $0.43 per share for the year ended December, 31 2013, 2012 and 2011, respectively)	(43,642)			(43,642)
Balance at Dec. 31, 2011	1,154,904	975	659,523	543,598	(23,226)	(25,966)
Comprehensive income:
Net income	63,560			63,560
Other comprehensive loss, net of tax of $559, $(7,506) and $5,964 for the year ended December, 31 2013, 2012 and 2011, respectively	11,738				11,738
Total comprehensive income	75,298			63,560	11,738
Exercise of stock options	2,131	3	2,128
Share repurchases	(52,028)	(44)	(51,984)
Stock-based compensation expense including tax benefits of $635, $403 and $610 for the year ended December, 31 2013, 2012 and 2011, respectively	5,026	3	3,582			1,441
Dividends paid ($0.50, $0.60, $0.43 per share for the year ended December, 31 2013, 2012 and 2011, respectively)	(56,862)			(56,862)
Balance at Dec. 31, 2012	1,128,469	937	613,249	550,296	(11,488)	(24,525)
Comprehensive income:
Net income	66,739			66,739
Other comprehensive loss, net of tax of $559, $(7,506) and $5,964 for the year ended December, 31 2013, 2012 and 2011, respectively	(412)				(412)
Total comprehensive income	66,327			66,739	(412)
Exercise of stock options	6,618	7	6,611
Share repurchases	(4,459)	(4)	(4,455)
Stock-based compensation expense including tax benefits of $635, $403 and $610 for the year ended December, 31 2013, 2012 and 2011, respectively	5,718	3	4,273			1,442
Dividends paid ($0.50, $0.60, $0.43 per share for the year ended December, 31 2013, 2012 and 2011, respectively)	(45,871)			(45,871)
Balance at Dec. 31, 2013	$ 1,156,802	$ 943	$ 619,678	$ 571,164	$ (11,900)	$ (23,083)