Fair Value Of Financial Instruments (Estimated Fair Values Of Financial Instruments) (Details) (USD $) In Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2011	Dec. 31, 2010
Securities purchased under agreements to resell	$ 255,000	$ 110,000
Securities held-to-maturity	1,271,767	840,102
Securities available-for-sale	1,184,504	2,003,567
Loans held-for-sale	1,637	2,873
Securities sold under agreement to repurchase, fair value	1,411,500	1,561,000
Interest rate swaps	5,300	6,500
Off-Balance Sheet Financial Information [Member]
Commitments to extend credit, fair value	(913)	(603)
Commitments to extend, notional amount	1,473,961	1,360,266
Standby letters of credit, fair value	(151)	(282)
Other letters of credit, fair value	(44)	(38)
Standby letters of credit, notional amount	53,894	59,876
Other letters of credit, notional amount	79,531	62,722
Bill of lading guarantees, fair value		(1)
Bill of lading guarantees, notional amount		245
Financial Liabilities [Member] \| Carrying Amount [Member]
Deposits, fair value	7,109,149	6,991,846
Securities sold under agreement to repurchase, fair value	1,411,500	1,561,000
Advances from Federal Home Loan Bank	250,000	550,000
Other borrowings	38,436	27,576
Long-term debt	171,136	171,136
Financial Liabilities [Member] \| Fair Value [Member]
Deposits, fair value	7,120,455	7,006,913
Securities sold under agreement to repurchase, fair value	1,565,715	1,704,585
Advances from Federal Home Loan Bank	262,355	580,054
Other borrowings	38,446	27,585
Long-term debt	103,500	114,557
Option contracts	46	72
Interest rate swaps	5,344	6,508
Foreign exchange contracts	391	1,873
Financial Liabilities [Member] \| Notional Amount [Member]
Option contracts	12,411	72
Interest rate swaps	300,000	300,000
Foreign exchange contracts	113,689	68,355
Financial Assets [Member] \| Carrying Amount [Member]
Cash and due from banks	128,584	87,347
Short-term investments	96,061	206,321
Securities purchased under agreements to resell	255,000	110,000
Securities held-to-maturity	1,271,767	840,102
Securities available-for-sale	1,184,504	2,003,567
Trading securities	4,599	3,818
Loans held-for-sale	1,637	2,873
Loans, net	6,684,637	6,615,769
Investment in Federal Home Loan Bank stock	58,759	63,873
Warrants	58	40
Financial Assets [Member] \| Fair Value [Member]
Cash and due from banks	128,584	87,347
Short-term investments	96,061	206,321
Securities purchased under agreements to resell	255,000	110,000
Securities held-to-maturity	1,286,976	837,359
Securities available-for-sale	1,184,504	2,003,567
Trading securities	4,599	3,818
Loans held-for-sale	1,637	2,873
Loans, net	6,664,700	6,596,501
Investment in Federal Home Loan Bank stock	58,759	63,873
Warrants	58	40
Option contracts	129	106
Foreign exchange contracts	1,737	4,629
Financial Assets [Member] \| Notional Amount [Member]
Option contracts	25,066	29,336
Foreign exchange contracts	$ 172,463	$ 112,665

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The amount shown on the books that a bank with insufficient reserves borrows, at the federal funds rate, from another bank to meet its reserve requirements and the amount of securities that an institution sells and agrees to repurchase at a specified date for a specified price, net of any reductions or offsets.

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Fair value as of the balance sheet date of all derivative liabilities designated as foreign currency fair value hedging instruments.

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Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities.

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Namespace Prefix:	us-gaap
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Balance Type:	debit
Period Type:	instant

- 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

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

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 13
-Subparagraph 1
-Article 9

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

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

+ Details

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Balance Type:	credit
Period Type:	instant

- 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

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

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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.

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

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Trading Securities
-URI http://asc.fasb.org/extlink&oid=6526789

+ Details

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