Loans (Schedule Of Analysis Of Activity In The Allowance For Credit Losses) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of year				$ 245,231				$ 211,889	$ 245,231	$ 211,889	$ 122,093
Provision for credit losses	2,000	9,000	10,000	6,000	10,000	17,900	45,000	84,000	27,000	156,900	307,000
Transfers from reserve for off-balance sheet credit commitments.									268	2,870	2,125
Loans charged off									(77,626)	(138,755)	(222,547)
Recoveries of charged off loans									11,407	12,327	3,218
Balance at end of year	206,280				245,231				206,280	245,231	211,889
Reserve For Off-balance Sheet Credit Commitments [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of year				2,337				5,207	2,337	5,207	7,332
Provision for credit losses									(268)	(2,870)	(2,125)
Balance at end of year	$ 2,069				$ 2,337				$ 2,069	$ 2,337	$ 5,207