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Commercial Mortgage Banking - Schedule of Amortization Expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Servicing Asset at Amortized Cost [Line Items]        
2015 $ 1,068      
2016 4,270      
2017 4,262      
2018 4,232      
2019 4,075      
Thereafter 11,687      
Amortization expense 29,594 $ 30,140 $ 29,496 $ 28,879
Originated MSRs [Member]        
Servicing Asset at Amortized Cost [Line Items]        
2015 773      
2016 3,089      
2017 3,083      
2018 3,059      
2019 2,963      
Thereafter 9,488      
Amortization expense 22,455      
Purchased MSRs [Member]        
Servicing Asset at Amortized Cost [Line Items]        
2015 295      
2016 1,181      
2017 1,179      
2018 1,173      
2019 1,112      
Thereafter 2,199      
Amortization expense $ 7,139