CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data, 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, 2012	$ 1,128,469	$ 937	$ 613,249	$ 550,296	$ (11,488)	$ (24,525)
Balance (in shares) at Dec. 31, 2012		93,652,960
Comprehensive income:
Net income	15,298			15,298
Other comprehensive income, net of tax of $(2,421) and $(883) for the three months ending March 31, 2014 and 2013, respectively	1,513				1,513
Total comprehensive income	16,811			15,298	1,513
Exercise of stock options	1,218	1	1,217
Exercise of stock options (in shares)		149,375
Stock compensation expense	1,082		694			388
Balance at Mar. 31, 2013	1,147,580	938	615,160	565,594	(9,975)	(24,137)
Balance (in shares) at Mar. 31, 2013		93,802,335
Balance at Dec. 31, 2013	1,156,802	943	619,678	571,164	(11,900)	(23,083)
Balance (in shares) at Dec. 31, 2013		94,243,713
Comprehensive income:
Net income	14,640			14,640
Other comprehensive income, net of tax of $(2,421) and $(883) for the three months ending March 31, 2014 and 2013, respectively	3,805				3,805
Total comprehensive income	18,445			14,640	3,805
Exercise of stock options	2,294	2	2,292
Exercise of stock options (in shares)		220,717
Stock compensation expense	1,239		788			451
Dividends paid ($0.23 per share)	(21,224)			(21,224)
Balance at Mar. 31, 2014	$ 1,157,556	$ 945	$ 622,758	$ 564,580	$ (8,095)	$ (22,632)
Balance (in shares) at Mar. 31, 2014		94,464,430