Investment Securities - HTM (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
HTM Securities
Net Carrying Amount (Amortized Cost)	$ 520,342	$ 321,244
Gross Unrealized Holdings Gains		257
Gross Unrealized Holdings Losses	(14,694)	(6,246)
Fair Value	505,648	315,255
HTM preferred equity interests
Less than one year	210,834
One to three years	106,112
Three to five years	183,765
Thereafter	19,631
Total	520,342	321,244
Preferred Equity Investment
HTM Securities
Net Carrying Amount (Amortized Cost)	19,631	19,386
Gross Unrealized Holdings Losses	(192)	(595)
Fair Value	19,439	18,791
HTM preferred equity interests
Thereafter	19,631
Total	19,631	19,386
CMBS
HTM Securities
Net Carrying Amount (Amortized Cost)	500,711	301,858
Gross Unrealized Holdings Gains		257
Gross Unrealized Holdings Losses	(14,502)	(5,651)
Fair Value	486,209	296,464
HTM preferred equity interests
Less than one year	210,834
One to three years	106,112
Three to five years	183,765
Total	$ 500,711	$ 301,858