Federal Funds Purchased and Securities Sold under Agreements to Repurchase and Wholesale Borrowings (Details) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Securities Sold under Agreements to Repurchase	$ 902,300,000	$ 836,400,000
Federal funds purchased and securities sold under agreements to repurchase	866,265,000	777,585,000
Wholesale borrowings	203,462,000	326,007,000
FHLB advances [Member]
Wholesale borrowings	203,068,000	325,560,000
Other Wholesale Borrowings [Member]
Wholesale borrowings	$ 394,000	$ 447,000

Federal Home Loan Bank borrowings due within one year of the latest balance sheet date.

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

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-Name Accounting Standards Codification

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-SubTopic 470

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Name Federal Regulation (FR)

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

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-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 5: http://www.xbrl.org/2003/role/presentationRef

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

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-Name Regulation S-X (SX)

-Number 210

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-Article 9

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 47

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 470

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822

+ Details

- 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+ Details