Fair Value Of Financial Instruments (Estimated Fair Value Of Financial Instruments) (Details) (USD $) In Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2011	Dec. 31, 2010
Financial Instruments Owned [Line Items]
Securities purchased under agreements to resell	$ 80,000	$ 110,000
Securities held-to-maturity	1,235,736	840,102
Securities available-for-sale	1,057,371	2,003,567
Loans held-for-sale	1,276	2,873
Securities sold under agreements to repurchase	1,407,500	1,561,000
Interest rate swaps	3,900	6,500
Financial Assets [Member] \| Carrying Amount [Member]
Financial Instruments Owned [Line Items]
Cash and due from banks	208,873	87,347
Short-term investments	33,693	206,321
Securities purchased under agreements to resell	80,000	110,000
Securities held-to-maturity	1,235,736	840,102
Securities available-for-sale	1,057,371	2,003,567
Trading securities	156,977	3,818
Loans held-for-sale	1,276	2,873
Loans, net	6,799,666	6,615,769
Investment in Federal Home Loan Bank stock	56,175	63,873
Warrants	47	40
Financial Assets [Member] \| Fair Value [Member]
Financial Instruments Owned [Line Items]
Cash and due from banks	208,873	87,347
Short-term investments	33,693	206,321
Securities purchased under agreements to resell	80,000	110,000
Securities held-to-maturity	1,285,926	837,359
Securities available-for-sale	1,057,371	2,003,567
Trading securities	156,977	3,818
Loans held-for-sale	1,276	2,873
Loans, net	6,779,506	6,596,501
Investment in Federal Home Loan Bank stock	56,175	63,873
Warrants	47	40
Option contracts	161	106
Foreign exchange contracts	1,196	4,629
Financial Assets [Member] \| Notional Amount [Member]
Financial Instruments Owned [Line Items]
Option contracts	27,861	29,336
Foreign exchange contracts	121,764	112,665
Financial Liabilities [Member] \| Carrying Amount [Member]
Financial Instruments Owned [Line Items]
Deposits	7,125,124	6,991,846
Securities sold under agreements to repurchase	1,407,500	1,561,000
Advances from Federal Home Loan Bank	205,000	550,000
Other borrowings	21,725	27,576
Long-term debt	171,136	171,136
Financial Liabilities [Member] \| Fair Value [Member]
Financial Instruments Owned [Line Items]
Deposits	7,136,126	7,006,913
Securities sold under agreements to repurchase	1,564,605	1,704,585
Advances from Federal Home Loan Bank	210,754	580,054
Other borrowings	21,727	27,585
Long-term debt	95,563	114,557
Option contracts	501	72
Interest rate swaps	3,928	6,508
Foreign exchange contracts	3,904	1,873
Financial Liabilities [Member] \| Notional Amount [Member]
Financial Instruments Owned [Line Items]
Option contracts	8,532	72
Interest rate swaps	300,000	300,000
Foreign exchange contracts	124,120	68,355
Off-Balance Sheet Financial Instruments [Member]
Financial Instruments Owned [Line Items]
Commitments to extend credit, notional amount	1,533,878	1,360,266
Commitments to extend credit, fair value	(1,005)	(603)
Standby letters of credit, notional amount	58,597	59,876
Standby letters of credit, fair value	(319)	(282)
Other letters of credit, notional amount	73,705	62,722
Other letters of credit, fair value	(47)	(38)
Bill of lading guarantees, notional amount	131	245
Bill of lading guarantees, fair value	$ (1)	$ (1)

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.3)

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

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- Definition

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.

+ References

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 210.9-03.13(1))

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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6935251&loc=d3e9760-107771

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 13

-Subparagraph 1

-Article 9

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(m)(1)(a)(i))

-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 140

-Paragraph 100

-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.

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-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-BRD

-Chapter 4

-Paragraph 36

-IssueDate 2006-05-01

-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.

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- Definition

Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 7

-Section 03

-Paragraph 1

-Subparagraph g

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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 Trading Securities which consist of all investments in certain debt and equity securities 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 which an entity has elected the fair value option. Trading generally reflects active and frequent buying and selling, and trading securities are generally used with the objective of generating profits on short-term differences in price, but this category of investments may also include items which are not intended to be sold in the near term or for which the fair value option has been elected.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 12

-Subparagraph a

-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.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6379932&loc=d3e22054-111558

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789

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