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Loans (Unpaid Principal Balance And Carrying Value Of Acquired Loans) (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Bank Acquisitions [Member]
   
Unpaid Principal Balance $ 612,702 $ 674,868
Carrying Value, Acquired loans 462,129 503,837
Life Insurance Premium Finance Acquisition [Member]
   
Unpaid Principal Balance 519,757 536,503
Carrying Value, Acquired loans $ 499,731 $ 514,459