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Commercial Mortgage Banking - Schedule of Amortization Expense (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Transfers And Servicing [Abstract]  
2013 $ 3,538
2014 3,531
2015 3,531
2016 3,498
2017 3,435
Thereafter 10,588
Amortization expense $ 28,121