Finance Receivables And Allowance For Credit Losses (Schedule Of Risk Category Of Loans) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	$ 1,205,532	$ 1,216,654
Commercial [Member] | Grade, Pass [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	1,113,539	1,103,556
Commercial [Member] | Grade, Criticized [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	46,057	36,212
Commercial [Member] | Grade, Classified - Substandard [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	16,202	41,695
Commercial [Member] | Grade, Classified - Doubtful [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	29,734	35,191
Commercial Real Estate - Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	64,910	46,141
Commercial Real Estate - Construction [Member] | Grade, Pass [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	43,096	16,841
Commercial Real Estate - Construction [Member] | Grade, Criticized [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	13,437	13,605
Commercial Real Estate - Construction [Member] | Grade, Classified - Substandard [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	3,503	10,147
Commercial Real Estate - Construction [Member] | Grade, Classified - Doubtful [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	4,874	5,548
Commercial Real Estate - Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	977,671	1,021,229
Commercial Real Estate - Other [Member] | Grade, Pass [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	855,632	895,543
Commercial Real Estate - Other [Member] | Grade, Criticized [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	43,586	30,331
Commercial Real Estate - Other [Member] | Grade, Classified - Substandard [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	25,264	34,478
Commercial Real Estate - Other [Member] | Grade, Classified - Doubtful [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	$ 53,189	$ 60,877