Loans And Allowance For Loan Losses (Financing Receivable Credit Quality Indicators) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Risk Profile by Risk Rating	$ 2,234,817	$ 1,937,052
Commercial [Member] | Non-Watch List [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Risk Profile by Risk Rating	2,064,658	1,718,691
Commercial [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Risk Profile by Risk Rating	100,499	77,201
Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Risk Profile by Risk Rating	16,688	48,915
Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Risk Profile by Risk Rating	52,972	92,245
Real Estate - Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Risk Profile by Risk Rating	84,590	128,520
Real Estate - Construction [Member] | Non-Watch List [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Risk Profile by Risk Rating	83,100	127,709
Real Estate - Construction [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Risk Profile by Risk Rating	355	0
Real Estate - Construction [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Risk Profile by Risk Rating		44
Real Estate - Construction [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Risk Profile by Risk Rating	1,135	767
Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Risk Profile by Risk Rating	1,394,555	1,294,897
Real Estate - Commercial [Member] | Non-Watch List [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Risk Profile by Risk Rating	1,275,280	1,196,679
Real Estate - Commercial [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Risk Profile by Risk Rating	27,777	18,917
Real Estate - Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Risk Profile by Risk Rating	35,019	34,006
Real Estate - Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Risk Profile by Risk Rating	$ 56,479	$ 45,295