Acquisitions - Acquired Impaired Loans at Acquisition Date (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 04, 2011
Acquired Impaired Loans At Acquisition Date [Line Items]
Contractually required principal and interest payments	$ 880,612
Nonaccretable difference	212,987
Cash flows expected to be collected	667,625
Accretable difference	132,136
Fair value of loans acquired with a deterioration of credit quality	$ 535,489

The investor's estimate, at acquisition, of the amount and timing of undiscounted principal, interest, and other cash flows expected to be collected. This would be the investor's best estimate of cash flows, including the effect of prepayments if considered, that is used in determining the acquisition price, and, in a business combination, the investor's estimate of fair value for purposes of acquisition price allocation. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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The total undiscounted amount of all uncollected contractual principal and contractual interest payments both past due and scheduled for the future, adjusted for the timing of prepayments, if considered, less any reduction by the investor at the acquisition date. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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