CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	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, 2010	$ 749,777	$ 105,515	$ 366,488	$ 291,492	$ (2,458)	$ (7,660)	$ (3,600)
Beginning balance, Shares Outstanding at Dec. 31, 2010		104,846,194
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	15,274			15,274
Total other comprehensive (loss) Income	4,459				4,459
Cash dividends declared	(12,558)			(12,558)
Net decrease in unearned ESOP shares	2,000						2,000
ESOP market value adjustment	(685)		(685)
Discount on dividend reinvestment plan purchases	(63)		(63)
Tax benefit of stock options exercised	6		6
Treasury stock acquired	(9)					(9)
Treasury stock acquired, Shares Outstanding		(1,336)
Treasury stock reissued	72		0	(83)		155
Treasury stock reissued, Shares Outstanding		13,760
Restricted stock	126	25	1	(69)		169
Restricted stock, Shares Outstanding		35,000
Common stock issued	144	23	121	0
Common stock issued, Shares Outstanding		23,376
Ending balance at Dec. 31, 2011	758,543	105,563	365,868	294,056	2,001	(7,345)	(1,600)
Ending balance, Shares Outstanding at Dec. 31, 2011		104,916,994
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	41,954			41,954
Total other comprehensive (loss) Income	(742)				(742)
Cash dividends declared	(18,759)			(18,759)
Net decrease in unearned ESOP shares	1,600						1,600
ESOP market value adjustment	(474)		(474)
Discount on dividend reinvestment plan purchases	(92)		(92)
Tax benefit of stock options exercised	1		1
Treasury stock acquired	(37,464)					(37,464)
Treasury stock acquired, Shares Outstanding		(5,662,700)
Treasury stock reissued	1,028		0	(379)		1,407
Treasury stock reissued, Shares Outstanding		155,200
Restricted stock	412	0	51	(1,264)		1,625
Restricted stock, Shares Outstanding		220,000
Ending balance at Dec. 31, 2012	746,007	105,563	365,354	315,608	1,259	(41,777)	0
Ending balance, Shares Outstanding at Dec. 31, 2012	99,629,494	99,629,494
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	41,482			41,482
Total other comprehensive (loss) Income	(21,847)				(21,847)
Cash dividends declared	(22,344)			(22,344)
Discount on dividend reinvestment plan purchases	(112)		(112)
Treasury stock acquired	(32,217)					(32,217)
Treasury stock acquired, Shares Outstanding		(4,462,638)
Treasury stock reissued	176			0		176
Treasury stock reissued, Shares Outstanding		25,359
Restricted stock	552	0	91	2		459
Restricted stock, Shares Outstanding		53,000
Ending balance at Dec. 31, 2013	$ 711,697	$ 105,563	$ 365,333	$ 334,748	$ (20,588)	$ (73,359)	$ 0
Ending balance, Shares Outstanding at Dec. 31, 2013	95,245,215	95,245,215