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INVESTMENT SECURITIES, Unrealized Losses and Corporate Debt Securities (Details) (USD $) | Jun. 30, 2011
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Schedule of Available-for-sale Securities [Line Items] |
Investment grade corporate debt securities available-for-sale | $ 1,120,000,000
Total investment securities available-for-sale portfolio (in hundredths) | 35.00%
Number of securities in a continuous unrealized loss position for more than twelve months | 8
Number of individual securities with a continuous unrealized loss position | 96
Scheduled maturities of investment securities available-for sale, amortized cost basis [Abstract] |
Due within one year | 1,313,357,000
Due after one year through five years | 350,888,000
Due after five years through ten years | 767,516,000
Due after ten years | 768,426,000
Total investment securities available-for-sale | 3,200,187,000
Scheduled maturities of investment securities available-for sale, fair value [Abstract] |
Due within one year | 1,309,062,000
Due after one year through five years | 353,157,000
Due after five years through ten years | 761,926,000
Due after ten years | 781,963,000
Total investment securities available-for-sale | 3,206,108,000
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 | 15
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 | 10
Municipal Securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Number of individual securities with a continuous unrealized loss position | 4
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 | 3
Corporate debt securities at estimated fair value | 39,500,000
Number of individual securities with a continuous unrealized loss position | 64
Gross unrealized losses, trust preferred securities, portion representing impairment loss on securities not other-than-temporarily-impaired | 4,400,000
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
Percentage of total amortized cost basis of corporate debt securities (in hundredths) | 1.00%
Other Securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Number of individual securities with a continuous unrealized loss position | 2
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 | $ 10,700,000
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) | 47.00%

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