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SECURITIES SOLD UNDER REPURCHASE AGREEMENTS AND OTHER BORROWINGS (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Mar. 31, 2012
Amount of securities sold under repurchase agreements |  |  |  |
Total | $ 995,000,000 | $ 995,000,000 |  |
Other disclosures |  |  |  |
Total interest expense recorded on repurchase agreements | 41,381,000 | 46,166,000 | 48,561,000 |
Other borrowings |  | 20,000,000 |  |
Securities Sold Under Repurchase Agreements |  |  |  |
Securities sold under repurchase agreements and other borrowings |  |  |  |
Amount of long-term repurchase agreements modified |  | 150,000,000 |  | 200,000,000
Reduction in interest rates on long-term repurchase agreements modified (as a percent) |  | 1.95% |  | 0.86%
Amount of securities sold under repurchase agreements |  |  |  |
Total | 995,000,000 | 995,000,000 |  |
Interest rate on securities sold under repurchase agreements |  |  |  |
Total (as a percent) | 4.06% | 4.30% |  |
Other disclosures |  |  |  |
Total interest expense recorded on repurchase agreements | 41,400,000 | 46,200,000 | 48,600,000 |
Available borrowing capacity from repurchase agreements | 811,100,000 | 1,190,000,000 |  |
Securities Sold Under Repurchase Agreements | Minimum |  |  |  |
Securities sold under repurchase agreements and other borrowings |  |  |  |
Interest rates on long-term repurchase agreements (as a percent) | 2.49% |  |  |
Securities Sold Under Repurchase Agreements | Maximum |  |  |  |
Securities sold under repurchase agreements and other borrowings |  |  |  |
Interest rates on long-term repurchase agreements (as a percent) | 5.01% |  |  |
Securities Sold Under Repurchase Agreements | Maturities in Year Three |  |  |  |
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 Four |  |  |  |
Amount of securities sold under repurchase agreements |  |  |  |
Total | 250,000,000 | 350,000,000 |  |
Interest rate on securities sold under repurchase agreements |  |  |  |
Total (as a percent) | 5.01% | 4.96% |  |
Securities Sold Under Repurchase Agreements | Maturities in Year Five |  |  |  |
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% |  |
Securities Sold Under Repurchase Agreements | Maturities in year ten |  |  |  |
Amount of securities sold under repurchase agreements |  |  |  |
Total | 350,000,000 | 350,000,000 |  |
Interest rate on securities sold under repurchase agreements |  |  |  |
Total (as a percent) | 3.51% | 3.53% |  |
Securities Sold Under Repurchase Agreements | Maturities in year Eleven |  |  |  |
Amount of securities sold under repurchase agreements |  |  |  |
Total | 100,000,000 |  |  |
Interest rate on securities sold under repurchase agreements |  |  |  |
Total (as a percent) | 2.49% |  |  |
Short term borrowings |  |  |  |
Other disclosures |  |  |  |
Other borrowings | $ 0 | $ 20,000,000 |  |
Maturity period of debt |  | 2 days |  |
Annual interest rate (as a percent) |  | 0.25% |  |

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