Loans And Allowance For Loan Losses (Credit Quality Of Commercial Loan Portfolio) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Loans And Allowance For Loan Losses [Line Items]
Commercial loans, carrying amount	$ 6,435,066	$ 5,705,772
Pass [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial loans, carrying amount	6,180,979	5,419,131
Special Mention [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial loans, carrying amount	116,692	108,589
Substandard [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial loans, carrying amount	95,852	134,014
Non-Accrual [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial loans, carrying amount	41,543	44,038
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial loans, carrying amount	3,715,319	3,134,801
Business [Member] | Pass [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial loans, carrying amount	3,618,120	3,018,062
Business [Member] | Special Mention [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial loans, carrying amount	61,916	58,793
Business [Member] | Substandard [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial loans, carrying amount	23,691	44,890
Business [Member] | Non-Accrual [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial loans, carrying amount	11,592	13,056
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial loans, carrying amount	406,197	355,996
Real Estate - Construction And Land [Member] | Pass [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial loans, carrying amount	372,515	297,156
Real Estate - Construction And Land [Member] | Special Mention [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial loans, carrying amount	1,697	11,400
Real Estate - Construction And Land [Member] | Substandard [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial loans, carrying amount	21,812	33,762
Real Estate - Construction And Land [Member] | Non-Accrual [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial loans, carrying amount	10,173	13,678
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial loans, carrying amount	2,313,550	2,214,975
Real Estate - Business [Member] | Pass [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial loans, carrying amount	2,190,344	2,103,913
Real Estate - Business [Member] | Special Mention [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial loans, carrying amount	53,079	38,396
Real Estate - Business [Member] | Substandard [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial loans, carrying amount	50,349	55,362
Real Estate - Business [Member] | Non-Accrual [Member]
Loans And Allowance For Loan Losses [Line Items]
Commercial loans, carrying amount	$ 19,778	$ 17,304