Income Taxes (Deferred Tax Assets and Liabilities) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Deferred income tax assets
Net operating loss carryforward	$ 514,275,000	$ 446,017,000
Provision losses on loans	268,406,000	330,468,000
Tax credit carryforward	44,170,000	43,081,000
Finance lease transactions	4,901,000	23,311,000
Net unrealized loss on cash flow hedges	243,000	0
Other	46,779,000	34,126,000
Total gross deferred income tax assets	878,774,000	877,003,000
Less valuation allowance	(821,429,000)	(774,961,000)
Total deferred income tax assets	57,345,000	102,042,000
Deferred income tax liabilities
Excess tax over financial statement depreciation	(16,371,000)	(43,993,000)
Net unrealized gain on investment securities available for sale	(29,390,000)	(39,312,000)
Net unrealized gain on cash flow hedges	0	(4,036,000)
Other	(9,446,000)	(12,921,000)
Total gross deferred income tax liabilities	(55,207,000)	(100,262,000)
Net deferred income tax assets	2,138,000	1,780,000
Net deferred income tax assets before valuation allowance	823,600,000	776,700,000	455,300,000
Valuation allowance recorded during the period	46,400,000	331,600,000	438,200,000
Deferred tax assets expected to be realized	2,100,000
Valuation allowance, current	$ 800,400,000