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Goodwill (Schedule Of Assumptions Used In Estimating Fair Value) (Parenthetical) (Detail)
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3 Months Ended | |
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Jun. 30, 2012
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Dec. 31, 2011
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Banking/Treasury [Member]
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| Indefinite-lived Intangible Assets by Segment [Line Items] | ||
| Control premium percent used to measure fair value | 30.00% | 55.00% |
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Investment Banking/Brokerage/Trust [Member]
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| Indefinite-lived Intangible Assets by Segment [Line Items] | ||
| Control premium percent used to measure fair value | 20.00% | |
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Insurance [Member]
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| Indefinite-lived Intangible Assets by Segment [Line Items] | ||
| Control premium percent used to measure fair value | 30.00% | |