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Commercial Mortgage Banking - Schedule of Amortization Expense (Details)
$ in Thousands
Dec. 31, 2015
USD ($)
Servicing Asset at Amortized Cost [Line Items]  
2016 $ 4,123
2017 4,118
2018 4,083
2019 3,927
2020 3,670
Thereafter 8,247
Amortization expense 28,168
Originated MSRs  
Servicing Asset at Amortized Cost [Line Items]  
2016 3,039
2017 3,036
2018 3,008
2019 2,913
2020 2,758
Thereafter 6,962
Amortization expense 21,716
Purchased MSRs  
Servicing Asset at Amortized Cost [Line Items]  
2016 1,084
2017 1,082
2018 1,075
2019 1,014
2020 912
Thereafter 1,285
Amortization expense $ 6,452