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Securities Sold Under Repurchase Agreements (Details) (USD $) | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010
Securities Sold Under Repurchase Agreements |  |
Average outstanding amount | $ 1,415,769,000 | $ 1,479,734,000
Maximum amount outstanding at any month end | 1,437,480,000 | 1,520,714,000
Collateral Securities and Repurchase Borrowing agreements |  |
Collateralized Securities, Book Value of Securities Sold | 1,672,925,000 | 1,747,043,000
Collateralized securities, Fair Value of Securities Sold | 1,736,519,000 | 1,777,975,000
Repurchase Borrowing, Balance of Liability | 1,348,629,000 | 1,433,270,000
Repurchase Borrowing, Weighted Average Interest Rate (as a percent) | 3.02% | 2.97%
Overnight agreements |  |
Collateral Securities and Repurchase Borrowing agreements |  |
Collateralized Securities, Book Value of Securities Sold | 377,620,000 | 432,252,000
Collateralized securities, Fair Value of Securities Sold | 388,304,000 | 426,112,000
Repurchase Borrowing, Balance of Liability | 245,026,000 | 311,333,000
Repurchase Borrowing, Weighted Average Interest Rate (as a percent) | 0.32% | 0.60%
1 to 29 days |  |
Collateral Securities and Repurchase Borrowing agreements |  |
Collateralized Securities, Book Value of Securities Sold | 13,772,000 | 26,714,000
Collateralized securities, Fair Value of Securities Sold | 14,227,000 | 27,177,000
Repurchase Borrowing, Balance of Liability | 10,263,000 | 16,308,000
Repurchase Borrowing, Weighted Average Interest Rate (as a percent) | 1.13% | 1.15%
30 to 90 days |  |
Collateral Securities and Repurchase Borrowing agreements |  |
Collateralized Securities, Book Value of Securities Sold | 45,512,000 | 44,443,000
Collateralized securities, Fair Value of Securities Sold | 48,177,000 | 45,438,000
Repurchase Borrowing, Balance of Liability | 30,095,000 | 30,167,000
Repurchase Borrowing, Weighted Average Interest Rate (as a percent) | 1.12% | 1.69%
Over 90 days |  |
Collateral Securities and Repurchase Borrowing agreements |  |
Collateralized Securities, Book Value of Securities Sold | 1,236,021,000 | 1,243,634,000
Collateralized securities, Fair Value of Securities Sold | 1,285,811,000 | 1,279,248,000
Repurchase Borrowing, Balance of Liability | $ 1,063,245,000 | $ 1,075,462,000
Repurchase Borrowing, Weighted Average Interest Rate (as a percent) | 3.72% | 3.71%

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- Definition Represents the average amount of securities sold under repurchase agreements during the period. + References No definition available. + Details
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- Definition Represents the maximum balance outstanding at any month end during the period as of the balance sheet date. + References No definition available. + Details
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- Definition Aggregate carrying value of assets sold under agreements to repurchase when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under repurchase agreements exceeds 10 percent of total assets, as of the most recent balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 4 -Section 08 -Paragraph m -Subparagraph 1 Reference 2: 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)(i)(A)(i)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 + Details
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- Definition The interest rate associated with the repurchase agreements. This is also known as the repo rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 4 -Section 08 -Paragraph m -Subparagraph 1 Reference 2: 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)(i)(A)(ii)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 + Details
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- Definition This is the value on the open market of assets sold under agreements to repurchase when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under repurchase agreements exceeds 10 percent of total assets, as of the most recent balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 4 -Section 08 -Paragraph m -Subparagraph 1 Reference 2: 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)(i)(A)(i)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 + Details
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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 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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