Fair Value Accounting (Assets And Liabilities Measured At Fair Value On A Non-Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	$ 1,062,520		$ 1,307,572
Other loans held for sale	10,690		30,156
Other real estate	150,271		204,232
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other loans held for sale	0
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other loans held for sale	0
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other loans held for sale	10,690
Fair Value Measured On Non-Recurring Basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	52,916	[1]	100,129	[1]
Other loans held for sale	5,144		4,860
Other real estate	22,615		53,876
Other properties held for sale	2,425		6,162
Fair Value Measured On Non-Recurring Basis [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0	[1]	0	[1]
Other loans held for sale	0		0
Other real estate	0		0
Other properties held for sale	0		0
Fair Value Measured On Non-Recurring Basis [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0	[1]	0	[1]
Other loans held for sale	0		0
Other real estate	0		0
Other properties held for sale	0		0
Fair Value Measured On Non-Recurring Basis [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	80,299	[1]	222,404	[1]
Other loans held for sale	7,420		6,532
Other real estate	79,293		112,164
Other properties held for sale	$ 5,804		$ 12,633

[1] Impaired loans that are collateral-dependent.