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INVESTMENT SECURITIES, Unrealized Losses and Corporate Debt Securities (Details) (USD $) | Sep. 30, 2011
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INVESTMENT SECURITIES [Abstract] |
Investment grade corporate debt securities available-for-sale | $ 1,400,000,000
Total investment securities available-for-sale portfolio (in hundredths) | 43.00%
Schedule of Available-for-sale Securities [Line Items] |
Number of securities in a continuous unrealized loss position for more than twelve months | 17
Number of individual securities with a continuous unrealized loss position | 157
Scheduled maturities of investment securities available-for sale, amortized cost basis [Abstract] |
Due within one year | 801,503,000
Due after one year through five years | 360,252,000
Due after five years through ten years | 1,030,845,000
Due after ten years | 1,125,701,000
Total investment securities available-for-sale | 3,318,301,000
Scheduled maturities of investment securities available-for sale, fair value [Abstract] |
Due within one year | 795,333,000
Due after one year through five years | 351,417,000
Due after five years through ten years | 978,194,000
Due after ten years | 1,154,648,000
Total investment securities available-for-sale | 3,279,592,000
Trust Preferred Securties [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Number of securities in a continuous unrealized loss position for more than twelve months | 5
Trust preferred securities at estimated fair value | 8,600,000
Trust preferred securities as a percentage of total investment securities available-for-sale portfolio (in hundredths) | 1.00%
Percentage of total amortized cost basis of these securities (in hundredths) | 57.00%
Corporate Debt Securities [Member] | Investment Grade [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Number of securities in a continuous unrealized loss position for more than twelve months | 12
Corporate debt securities at estimated fair value | 247,000,000
Number of individual securities with a continuous unrealized loss position | 128
Gross unrealized losses, trust preferred securities, portion representing impairment loss on securities not other-than-temporarily-impaired | $ 6,500,000
Corporate Debt Securities [Member] | Non-investment Grade [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Number of individual securities with a continuous unrealized loss position | 1
Residential Mortgage Backed Securities Issued By US Government Agencies And Government Sponsored Enterprise [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Number of individual securities with a continuous unrealized loss position | 14
US Government Agencies and Government Sponsored Enterprise Debt Securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Number of individual securities with a continuous unrealized loss position | 9
Municipal Securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Number of individual securities with a continuous unrealized loss position | 4
Other Securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Number of individual securities with a continuous unrealized loss position | 1

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