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Loans and Leases and the Allowance for Credit Losses - Outstanding Principal Balance and Carrying Amount of Loans that is Included in Consolidated Balance Sheet (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Outstanding principal and carrying value of acquired loans recorded at fair value    
Outstanding principal balance $ 4,302,336 $ 4,656,811
Carrying amount 3,697,582 4,007,452
Commercial, Financial, Leasing, etc. [Member]
   
Outstanding principal and carrying value of acquired loans recorded at fair value    
Carrying amount 474,612 580,685
Real Estate Commercial [Member]
   
Outstanding principal and carrying value of acquired loans recorded at fair value    
Carrying amount 1,412,397 1,541,368
Residential Real Estate [Member]
   
Outstanding principal and carrying value of acquired loans recorded at fair value    
Carrying amount 551,698 576,473
Consumer [Member]
   
Outstanding principal and carrying value of acquired loans recorded at fair value    
Carrying amount $ 1,258,875 $ 1,308,926