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Loans (Unpaid Principal Balance And Carrying Value Of Acquired Loans) (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Bank Acquisitions [Member]
   
Unpaid Principal Balance $ 812,285 $ 866,874
Carrying Value, Acquired loans 607,300 596,946
Life Insurance Premium Finance Acquisition [Member]
   
Unpaid Principal Balance 561,616 632,878
Carrying Value, Acquired loans $ 537,032 $ 598,463