Investment Securities (Schedule of Trust Preferred Securities) (Details) (USD $) In Thousands, unless otherwise specified					9 Months Ended
	Sep. 30, 2013 Numberofloans	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2013 Preferred Term Securities IV [Member] Numberofloans	Sep. 30, 2013 Preferred Term Securities VII [Member] Numberofloans	Sep. 30, 2013 TPREF Funding II [Member] Numberofloans	Sep. 30, 2013 TPREF Funding III [Member] Numberofloans	Sep. 30, 2013 Trapeza CDO I, LLC [Member] Numberofloans	Sep. 30, 2013 ALESCO Preferred Funding IV [Member] Numberofloans	Sep. 30, 2013 ALESCO Preferred Funding V [Member] Numberofloans	Sep. 30, 2013 Trust Preferred Securities [Member]	Dec. 31, 2012 Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Class / Tranche					Mezzanine Notes	Mezzanine Notes	Class B Notes	Class B2 Notes	Class C1 Notes	Class B1 Notes	Class C1 Notes
Available-for-sale Securities, Amortized Cost	$ 202,550	$ 187,667			$ 49	$ 1,056	$ 739	$ 1,521	$ 556	$ 604	$ 820	$ 5,345	$ 5,785
Investment securities available for sale	199,722	189,259			40	780	362	782	271	361	452	3,048	3,187
Unrealized Losses	(5,211)	(2,996)			(9)	(276)	(377)	(739)	(285)	(243)	(368)	(2,297)	(2,598)
Lowest Credit Rating Assigned					Caa2	C	C	C	C	C	C
Number of banks currently performing	136				6	12	16	17	9	38	38
Deferrals / Defaults as % of Current Balance	33.00%				18.00%	53.00%	44.00%	34.00%	49.00%	14.00%	24.00%
Conditional Default Rates for 2013 and beyond					0.37%	0.34%	0.36%	0.34%	0.38%	0.36%	0.36%
Cumulative OTTI Life to Date	$ 3,959	$ 3,959	$ 3,956	$ 3,925	$ 0	$ 2,173	$ 260	$ 480	$ 470	$ 396	$ 180