Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss), net [Member]	Treasury Stock [Member]	Unearned ESOP Shares [Member]
Beginning balance at Dec. 31, 2011	$ 758,543	$ 105,563	$ 365,868	$ 294,056	$ 2,001	$ (7,345)	$ (1,600)
Beginning balance, shares at Dec. 31, 2011		104,916,994
Net Income	11,051			11,051
Other comprehensive income (loss)	1,039				1,039
Cash dividends declared ($0.05 and $0.03 per share)	(3,147)			(3,147)
Net decrease in unearned ESOP shares	500						500
ESOP market value adjustment ($242, net of $85 tax benefit)	(157)		(157)
Discount on dividend reinvestment plan purchases	(16)		(16)
Tax benefit of stock options exercised	1		1
Treasury stock reissued	210			(163)		373
Treasury stock reissued, shares		33,024
Restricted stock, shares		100,000
Restricted stock	(666)		11	(603)		(74)
Ending balance at Mar. 31, 2012	767,358	105,563	365,707	301,194	3,040	(7,046)	(1,100)
Ending balance, shares at Mar. 31, 2012		105,050,018
Beginning balance at Dec. 31, 2012	746,007	105,563	365,354	315,608	1,259	(41,777)	0
Beginning balance, shares at Dec. 31, 2012	99,629,494	99,629,494
Net Income	10,553			10,553
Other comprehensive income (loss)	(1,571)				(1,571)
Cash dividends declared ($0.05 and $0.03 per share)	(4,976)			(4,976)
Discount on dividend reinvestment plan purchases	(25)		(25)
Treasury stock acquired	(2,381)					(2,381)
Treasury stock acquired, shares		(331,374)
Restricted stock	121		25			96
Ending balance at Mar. 31, 2013	$ 747,728	$ 105,563	$ 365,354	$ 321,185	$ (312)	$ (44,062)	$ 0
Ending balance, shares at Mar. 31, 2013	99,298,120	99,298,120