Loans (Schedule Of Portfolio By Risk Rating) (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 7,017,142	$ 6,868,621
Loans held for sale	1,276	2,873
Commercial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,821,059	1,441,167
Pass/Watch [Member] \| Commercial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,681,005	1,258,537
Special Mention [Member] \| Commercial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	43,125	58,189
Substandard [Member] \| Commercial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	91,094	118,670
Doubtful [Member] \| Commercial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	5,835	5,771
Real Estate Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	249,003	409,986
Real Estate Construction Loans [Member] \| Pass/Watch [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	118,932	191,455
Real Estate Construction Loans [Member] \| Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	24,932	53,172
Real Estate Construction Loans [Member] \| Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	96,951	153,857
Real Estate Construction Loans [Member] \| Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	8,188	11,502
Commercial Mortgage Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	3,748,524	3,940,061
Commercial Mortgage Loans [Member] \| Pass/Watch [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	3,310,957	3,365,040
Commercial Mortgage Loans [Member] \| Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	77,153	143,974
Commercial Mortgage Loans [Member] \| Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	360,414	431,047
Commercial Mortgage Loans [Member] \| Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans
Residential Mortgage And Equity Lines [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,182,711	1,061,330
Residential Mortgage And Equity Lines [Member] \| Pass/Watch [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,158,638	1,026,216
Residential Mortgage And Equity Lines [Member] \| Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,172	6,109
Residential Mortgage And Equity Lines [Member] \| Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	22,901	28,846
Residential Mortgage And Equity Lines [Member] \| Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans		159
Installment And Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	15,845	16,077
Installment And Other Loans [Member] \| Pass/Watch [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	15,783	15,535
Installment And Other Loans [Member] \| Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	62	542
Installment And Other Loans [Member] \| Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans
Installment And Other Loans [Member] \| Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans
Pass/Watch [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	6,285,315	5,856,783
Loans held for sale
Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	146,444	261,986
Loans held for sale
Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	571,360	732,420
Loans held for sale	776	2,873
Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	14,023	17,432
Loans held for sale	$ 500

The aggregate carrying amount of loans receivable that will be sold to other entities. Includes mortgage and all other loans (collectively, loans) not classified as held for investment. Such loans are stated at the lower of cost or market, or elected fair value. Mortgage loans exclude mortgage-backed securities which are considered a debt security (other loan).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(a))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 01-6

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-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 65

-Paragraph 4, 5, 6, 7, 9, 12, 28, 29

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=6949992&loc=d3e3084-111518

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

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-Section 03

-Paragraph 7

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher OTS

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-Paragraph 8

-Subparagraph h

-LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 65

-Paragraph 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522

+ Details