Loans and Leases (Unpaid Principal Balance And Related Carrying Amount of Acquired Loans) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Loans Individually Evaluated For Impairment [Member]
Credit impaired purchased loans evaluated individually for incurred credit losses, Unpaid principal balance	$ 256,520	$ 60,259
Carrying amount	168,018	40,177
Loans Collectively Evaluated For Impairment [Member]
Credit impaired purchased loans evaluated individually for incurred credit losses, Unpaid principal balance	2,118,935	557,708
Carrying amount	2,107,987	574,457
Acquired Loan [Member]
Credit impaired purchased loans evaluated individually for incurred credit losses, Unpaid principal balance	2,375,455	617,967
Carrying amount	$ 2,276,005	$ 614,634

The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and other-than-temporary impairments), for loans 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 undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loan, owed to the investor at the reporting date, whether or not currently due and whether or not any such amounts have been written or charged off by the investor. This relates to loans 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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