Commercial Mortgage Banking - Schedule of Amortization Expense (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Servicing Asset at Amortized Cost [Line Items]
2016	$ 3,131
2017	4,169
2018	4,137
2019	3,980
2020	3,737
Thereafter	8,870
Amortization expense	28,024	$ 28,168	$ 28,391	$ 30,140
Originated MSRs [Member]
Servicing Asset at Amortized Cost [Line Items]
2016	2,340
2017	3,116
2018	3,091
2019	2,995
2020	2,851
Thereafter	7,610
Amortization expense	22,003
Purchased MSRs [Member]
Servicing Asset at Amortized Cost [Line Items]
2016	791
2017	1,053
2018	1,046
2019	985
2020	886
Thereafter	1,260
Amortization expense	$ 6,021