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Investment Securities (Other-Than-Temporary Impairment Losses On Securities Recognized In Earnings) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Net impairment losses on securities recognized in earnings	$ 19,968	$ 4,642	$ 6,352
Available For Sale Securities [Member] \| Residential Mortgage-Backed Securities [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Net impairment losses on securities recognized in earnings	829	2,265	5,735
Available For Sale Securities [Member] \| Trust Preferred Securities [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Net impairment losses on securities recognized in earnings	825	2,377	183
Available For Sale Securities [Member] \| Equity Securities [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Net impairment losses on securities recognized in earnings			434
Held-To-Maturity Securities [Member] \| Trust Preferred Securities [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Net impairment losses on securities recognized in earnings	$ 18,314

The amount of other than temporary impairment losses on investments in debt securities categorized as Held-to-maturity which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) of investments in debt securities due to credit losses and other than temporary impairments due to other than credit losses when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis.

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