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Loans (Narrative) (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Loans and Leases Receivable Disclosure [Abstract]      
Deferred Discounts, Finance Charges and Interest Included in Receivables $ 40.0 $ 41.1 $ 36.8
Deferred loan fees and costs net, including fair value purchase accounting adjustments 10.5 13.2 12.6
Remaining accretable yield balance to be amortized $ 42.9