Other Comprehensive Income (Loss) (Reclassifications out of Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2011		Jun. 30, 2011		Mar. 31, 2011		Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Interest expense																	$ (118,822)	$ (150,023)	$ (217,602)
Income tax (expense) benefit	(21,130)		(27,765)		(27,371)		(16,979)		796,339		211		2,105		77		(93,245)	798,732	(1,312)
Investment securities gains, net																	2,945	39,142	75,007
Salaries and other personnel expense																	(741,537)	(816,237)	(903,765)
Net loss attributable to common shareholders	35,850	[1]	37,188	[1]	30,717	[1]	14,798	[1]	709,304	[2]	16,030	[2]	24,803	[2]	21,369	[2]	118,553	771,506	(118,712)
Net Unrealized Gains (Losses) on Cash Flow Hedges [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Interest expense																	(447)
Income tax (expense) benefit																	173
Net loss attributable to common shareholders																	(274)
Net Unrealized Gains (Losses) on Investment Securities Available for Sale [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income tax (expense) benefit																	(1,134)
Investment securities gains, net																	2,945
Net loss attributable to common shareholders																	1,811
Post-retirement Unfunded Health Benefit [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income tax (expense) benefit																	(65)
Salaries and other personnel expense																	170
Net loss attributable to common shareholders																	$ 105

[1] The fourth quarter of 2013 results include litigation loss contingency expense of $10.0 million

[2] The fourth quarter of 2012 results reflect a $796.3 million income tax benefit due primarily to the reversal of substantially all of the deferred tax asset valuation allowance. For additional discussion of the valuation allowance for deferred tax assets, see "Part II - Item 8. Financial Statements and Supplementary Data - Note 24 - Income Taxes" of this Report.