Investment Securities - HTM (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
HTM Securities
Net Carrying Amount (Amortized Cost)	$ 327,831	$ 321,244
Gross Unrealized Holdings Gains	1,913	257
Gross Unrealized Holdings Losses	(14,573)	(6,246)
Fair Value	315,171	315,255
HTM preferred equity interests
Less than one year	200,603
One to three years	107,720
Thereafter	19,508
Total	327,831	321,244
Preferred Equity Investment
HTM Securities
Net Carrying Amount (Amortized Cost)	19,508	19,386
Gross Unrealized Holdings Gains	1,884
Gross Unrealized Holdings Losses		(595)
Fair Value	21,392	18,791
HTM preferred equity interests
Thereafter	19,508
Total	19,508	19,386
CMBS
HTM Securities
Net Carrying Amount (Amortized Cost)	308,323	301,858
Gross Unrealized Holdings Gains	29	257
Gross Unrealized Holdings Losses	(14,573)	(5,651)
Fair Value	293,779	296,464
HTM preferred equity interests
Less than one year	200,603
One to three years	107,720
Total	$ 308,323	$ 301,858