Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (USD $) In Thousands	Total	Common stock	Additional paid-in capital	Retained earnings	Treasury stock	Unallocated common stock held by the ESOP	Accumulated other comprehensive income (loss)	Summary of comprehensive income
Beginning Balance at Dec. 31, 2009			$ 4,683,414	$ 2,401,606	$ (1,727,579)	$ (210,237)	$ 184,533
Common Stock		7,415
Stock plan expense			8,191
Tax benefit from stock plans			406
Allocation of ESOP stock			4,861			4,505
RRP stock granted			(145)		145
Purchase of common stock					(464)
Vesting of RRP stock			2,950
Net (loss) income	416,045			416,045				416,045
Dividends paid on common stock ($0.31 and $0.45 per share, respectively)	(221,817)			(221,817)
Exercise of stock options				(287)	1,245
Net unrealized gains on securities available for sale arising during period, net of tax expense of $26,185 and $84,161 in 2011 and 2010, respectively							121,863
Reclassification adjustment for gains in net income, net of tax expense of $40,526 and $37,750 in 2011 and 2010, respectively							(54,661)
Pension and other postretirement benefits adjustment, net of tax expense of $1,192 and $539 for 2011 and 2010, respectively							781
Other comprehensive (loss) income, net of tax							67,983	67,983
Total comprehensive (loss) income								484,028
Ending Balance at Sep. 30, 2010	5,622,770		4,699,677	2,595,547	(1,726,653)	(205,732)	252,516
Beginning Balance at Dec. 31, 2010	5,510,238		4,705,255	2,642,338	(1,725,946)	(204,230)	85,406
Common Stock		7,415
Stock plan expense			6,352
Tax benefit from stock plans			1,749
Allocation of ESOP stock			1,981			4,505
Purchase of common stock					(163)
Vesting of RRP stock			2,609
Net (loss) income	(375,453)			(375,453)				(375,453)
Dividends paid on common stock ($0.31 and $0.45 per share, respectively)	(153,114)			(153,114)
Exercise of stock options				(3,738)	6,803
Net unrealized gains on securities available for sale arising during period, net of tax expense of $26,185 and $84,161 in 2011 and 2010, respectively							37,916
Reclassification adjustment for gains in net income, net of tax expense of $40,526 and $37,750 in 2011 and 2010, respectively							(61,942)
Pension and other postretirement benefits adjustment, net of tax expense of $1,192 and $539 for 2011 and 2010, respectively							1,726
Other comprehensive (loss) income, net of tax							(22,300)	(22,300)
Total comprehensive (loss) income								(397,753)
Ending Balance at Sep. 30, 2011	$ 4,979,469		$ 4,717,946	$ 2,110,033	$ (1,719,306)	$ (199,725)	$ 63,106