Commercial Mortgage Banking - Schedule of Amortization Expense (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Servicing Asset at Amortized Cost [Line Items]
2016	$ 116
2017	232
2018	232
2019	232
2020	232
Thereafter	949
Amortization expense	1,993	$ 28,168	$ 29,220	$ 30,140
Originated MSRs [Member]
Servicing Asset at Amortized Cost [Line Items]
2016	97
2017	195
2018	195
2019	195
2020	195
Thereafter	791
Amortization expense	1,668
Purchased MSRs [Member]
Servicing Asset at Amortized Cost [Line Items]
2016	19
2017	37
2018	37
2019	37
2020	37
Thereafter	158
Amortization expense	$ 325