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Commercial Mortgage Banking - Schedule of Amortization Expense (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Servicing Asset at Amortized Cost [Line Items]        
2014 $ 2,156      
2015 4,312      
2016 4,288      
2017 4,232      
2018 4,107      
Thereafter 10,020      
Amortization expense 29,115 28,879 27,665 26,983
Originated MSRs [Member]
       
Servicing Asset at Amortized Cost [Line Items]        
2014 1,452      
2015 2,905      
2016 2,895      
2017 2,868      
2018 2,768      
Thereafter 7,376      
Amortization expense 20,264      
Purchased MSRs [Member]
       
Servicing Asset at Amortized Cost [Line Items]        
2014 704      
2015 1,407      
2016 1,393      
2017 1,364      
2018 1,339      
Thereafter 2,644      
Amortization expense $ 8,851