Investment Securities (Schedule of Trust Preferred Securities) (Details) (USD $) In Thousands, unless otherwise specified					9 Months Ended
	Sep. 30, 2014 Bank	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2014 Preferred Term Securities IV [Member] Bank	Sep. 30, 2014 Preferred Term Securities VII [Member] Bank	Sep. 30, 2014 TPREF Funding II [Member] Bank	Sep. 30, 2014 TPREF Funding III [Member] Bank	Sep. 30, 2014 Trapeza CDO I, LLC [Member] Bank	Sep. 30, 2014 ALESCO Preferred Funding IV [Member] Bank	Sep. 30, 2014 ALESCO Preferred Funding V [Member] Bank	Sep. 30, 2014 Trust Preferred Securities [Member]	Dec. 31, 2013 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
Amortized Cost	$ 159,039	$ 209,303			$ 49	$ 979	$ 732	$ 1,521	$ 556	$ 604	$ 820	$ 5,261	$ 5,277
Fair Value	158,830	204,891			40	809	379	775	324	414	438	3,179	2,850
Unrealized Losses	(2,525)	(7,167)			(9)	(170)	(353)	(746)	(232)	(190)	(382)	(2,082)	(2,427)
Lowest Credit Rating Assigned					B1	D	C	C	C	C	C
Number of banks currently performing	138				6	11	17	15	8	40	41
Deferrals / Defaults as % of Current Balance	30.00%				18.00%	54.00%	41.00%	36.00%	49.00%	8.00%	15.00%
Conditional Default Rates for 2014 and beyond					0.31%	0.35%	0.35%	0.27%	0.30%	0.32%	0.33%
Cumulative OTTI Life to Date	$ 3,966	$ 3,959	$ 3,959	$ 3,959	$ 0	$ 2,173	$ 267	$ 480	$ 470	$ 396	$ 180