Commercial Mortgage Banking - Schedule of Amortization Expense (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Transfers and Servicing [Abstract]
2016	$ 8
2017	33
2018	33
2019	33
2020	33
Thereafter	128
Amortization expense	$ 268	$ 28,168	$ 29,594	$ 30,140