Fair Value Of Financial Instruments (Schedule Of Estimated Fair Value Of Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	$ 9,120,399	$ 9,224,702
Trading	34,178	17,853
Non-marketable	120,734	115,832
Short-term federal funds sold and securities purchased under agreements to resell	40,925	11,870
Securities purchased under agreements to resell	850,000	850,000
Interest earning deposits with banks	12,038	39,853
Cash and due from banks	381,462	465,828
Derivative instruments	18,785	21,537
Non-interest bearing deposits	5,209,381	5,377,549
Savings, interest checking and money market deposits	9,038,283	8,933,941
Other borrowings	111,520	111,817
Derivative instruments	20,076	22,722
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held for sale	9,673	31,076
Available for sale	9,120,399	9,224,702
Trading	34,178	17,853
Non-marketable	120,734	115,832
Federal funds sold	40,925	11,870
Securities purchased under agreements to resell	850,000	850,000
Interest earning deposits with banks	12,038	39,853
Cash and due from banks	381,462	465,828
Derivative instruments	18,785	21,537
Non-interest bearing deposits	5,209,381	5,377,549
Savings, interest checking and money market deposits	9,038,283	8,933,941
Time open and certificates of deposits	2,524,096	2,488,393
Federal Funds Purchased	110,845	153,330
Securities sold under agreements to repurchase	1,012,143	1,102,751
Other borrowings	111,520	111,817
Derivative instruments	20,076	22,722
Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held for sale	9,684	33,279
Available for sale	9,120,399	9,224,702
Trading	34,178	17,853
Non-marketable	120,734	115,832
Federal funds sold	40,925	11,870
Securities purchased under agreements to resell	864,157	864,089
Interest earning deposits with banks	12,038	39,853
Cash and due from banks	381,462	465,828
Derivative instruments	18,785	21,537
Non-interest bearing deposits	5,209,381	5,377,549
Savings, interest checking and money market deposits	9,038,283	8,933,941
Time open and certificates of deposits	2,531,391	2,493,727
Federal Funds Purchased	110,845	153,330
Securities sold under agreements to repurchase	1,010,437	1,099,883
Other borrowings	124,894	126,397
Derivative instruments	20,076	22,722
Business [Member] \| Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,920,237	2,808,265
Business [Member] \| Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,933,184	2,820,005
Real Estate - Construction And Land [Member] \| Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	376,642	386,598
Real Estate - Construction And Land [Member] \| Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	379,239	388,723
Real Estate - Business [Member] \| Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,203,686	2,180,100
Real Estate - Business [Member] \| Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	2,228,049	2,197,535
Real Estate - Personal [Member] \| Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	1,458,467	1,428,777
Real Estate - Personal [Member] \| Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	1,497,628	1,485,028
Consumer [Member] \| Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	1,113,481	1,114,889
Consumer [Member] \| Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	1,141,300	1,136,798
Revolving Home Equity [Member] \| Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	448,169	463,587
Revolving Home Equity [Member] \| Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	455,468	471,086
Consumer Credit Card [Member] \| Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	723,759	788,701
Consumer Credit Card [Member] \| Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	737,158	780,808
Overdrafts [Member] \| Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	3,530	6,561
Overdrafts [Member] \| Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	$ 3,530	$ 6,561

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Derivative Liabilities Total

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Federal Home Loan Bank advances and other borrowings

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Interest Bearing Deposits With Federal Reserve Bank

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Long-term securities purchased under agreements to resell.

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Non-Marketable investments include Federal Home Loan Bank stock, Federal Reserve Bank stock, and private equity investments.

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For an unclassified balance sheet, this item represents investments in debt and equity securities which are categorized neither as held-to-maturity nor trading.

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For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks.

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The amount borrowed by a bank, at the federal funds rate, from another bank to meet its reserve requirements.

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The amount outstanding of funds lent to other depository institutions, securities brokers, or securities dealers in the form of Federal Funds sold; for example, immediately available funds lent under agreements or contracts that mature in one business day or roll over under a continuing contract, regardless of the nature of the transaction or the collateral involved, excluding overnight lending for commercial and industrial purposes. Also include Federal Funds sold under agreements to resell on a gross basis, excluding (1) sales of term Federal Funds, (2) due bills representing purchases of securities or other assets by the reporting bank that have not yet been delivered and similar instruments, (3) resale agreements that mature in more than one business day involving assets other than securities, and (4) yield maintenance dollar repurchase agreements.

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The aggregate of all domestic and foreign interest-bearing deposit liabilities.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents loans held-for-sale as presented on the statement of financial position which may include mortgage loans held-for-sale, finance receivables held-for-sale, or any other loans classified as held-for-sale which are due the Company as of the balance sheet date.

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The carrying value as of the balance sheet date of securities that an institution sells and agrees to repurchase (the identical or substantially the same securities) as a seller-borrower at a specified date for a specified price, also known as a repurchase agreement, or repo. Most repos involve obligations of the federal government or its agencies, but other financial instruments, such as commercial paper, banker's acceptances, and negotiable certificates of deposit, are sometimes used in repos.

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The total of financial instruments that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for debt and equity securities formerly categorized as available-for-sale or held-to-maturity which the entity held as of the date it opted to account for such securities at fair value. An enterprise may also categorize such a security as trading without the intent to sell it in the near term assuming the decision to categorize the security as trading occurred at acquisition.

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