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SECURITIES SOLD UNDER REPURCHASE AGREEMENTS (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Amount of securities sold under repurchase agreements |  |  |
Total | $ 1,020,208,000 | $ 1,083,545,000 |
Other disclosures |  |  |
Total interest expense recorded on repurchase agreements | 48,561,000 | 48,993,000 | 49,725,000
Securities Sold Under Repurchase Agreements |  |  |
Securities sold under repurchase agreements |  |  |
Short-term repurchase agreements | 25,200,000 | 88,500,000 |
Interest rates on short-term repurchase agreements (as a percent) | 0.57% | 0.54% |
Amount of securities sold under repurchase agreements |  |  |
Total | 1,020,208,000 | 1,083,545,000 |
Interest rate on securities sold under repurchase agreements |  |  |
Total (as a percent) | 4.66% | 4.42% |
Other disclosures |  |  |
Total interest expense recorded on repurchase agreements | 48,600,000 | 49,000,000 | 49,700,000
Available borrowing capacity from repurchase agreements | 979,800,000 | 1,210,000,000 |
Securities Sold Under Repurchase Agreements | Minimum |  |  |
Securities sold under repurchase agreements |  |  |
Interest rates on long-term repurchase agreements (as a percent) | 4.15% |  |
Securities Sold Under Repurchase Agreements | Maximum |  |  |
Securities sold under repurchase agreements |  |  |
Interest rates on long-term repurchase agreements (as a percent) | 5.13% |  |
Securities Sold Under Repurchase Agreements | Maturities in Next Twelve Months |  |  |
Amount of securities sold under repurchase agreements |  |  |
Total |  | 88,545,000 |
Interest rate on securities sold under repurchase agreements |  |  |
Total (as a percent) |  | 0.54% |
Securities Sold Under Repurchase Agreements | Maturities in Year Two |  |  |
Amount of securities sold under repurchase agreements |  |  |
Total | 25,208,000 |  |
Interest rate on securities sold under repurchase agreements |  |  |
Total (as a percent) | 0.57% |  |
Securities Sold Under Repurchase Agreements | Maturities in Year Five |  |  |
Amount of securities sold under repurchase agreements |  |  |
Total | 245,000,000 | 245,000,000 |
Interest rate on securities sold under repurchase agreements |  |  |
Total (as a percent) | 4.49% | 4.49% |
Securities Sold Under Repurchase Agreements | Maturities in Year Six |  |  |
Amount of securities sold under repurchase agreements |  |  |
Total | 700,000,000 | 700,000,000 |
Interest rate on securities sold under repurchase agreements |  |  |
Total (as a percent) | 4.91% | 4.91% |
Securities Sold Under Repurchase Agreements | Maturities in Year Seven |  |  |
Amount of securities sold under repurchase agreements |  |  |
Total | $ 50,000,000 | $ 50,000,000 |
Interest rate on securities sold under repurchase agreements |  |  |
Total (as a percent) | 4.15% | 4.15% |

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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 Gross expenses on securities sold coupled with an agreement to repurchase the same from the same counterparty at a fixed or determinable price within a fixed or variable time period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Chapter V -Section 563c.102 -Paragraph 7 -Subsection II -LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It 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 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.7) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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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