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Loans (Narrative) (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Loans and Leases Receivable Disclosure [Abstract]      
Deferred Discounts, Finance Charges and Interest Included in Receivables $ 40.6 $ 41.1 $ 39.5
Loans and Leases Receivable, Deferred Income $ (1.5) $ 13.2 $ 14.3