Investment Securities (Trust Preferred Securities) (Details) (USD $) In Thousands, unless otherwise specified				12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Preferred Term Securities IV [Member] entity	Dec. 31, 2012 Preferred Term Securities VII [Member] entity	Dec. 31, 2012 TPREF Funding II [Member] entity	Dec. 31, 2012 TPREF Funding III [Member] entity	Dec. 31, 2012 Trapeza CDO I, LLC [Member] entity	Dec. 31, 2012 ALESCO Preferred Funding IV [Member] entity	Dec. 31, 2012 ALESCO Preferred Funding V [Member] entity	Dec. 31, 2012 Trust Preferred Securities [Member] entity	Dec. 31, 2011 Trust Preferred Securities [Member]
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 Basis	$ 187,667	$ 174,396		$ 49	$ 1,497	$ 739	$ 1,520	$ 556	$ 604	$ 820	$ 5,785	$ 6,375
Available-for-sale Securities	189,259	174,323		40	1,126	334	745	236	290	416	3,187	3,410
Gross Unrealized Losses	(2,996)	(4,569)		(9)	(371)	(405)	(775)	(320)	(314)	(404)	(2,598)	(2,965)
Lowest Credit Rating Assigned				CCC	C	C	C	C	C	C
Number of banks currently performing				5	11	16	17	10	38	39	136
Deferrals / Defaults as % of Current Balance				27.00%	59.00%	43.00%	35.00%	51.00%	23.00%	33.00%	38.00%
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	$ 3,925	$ 3,883		$ 2,173	$ 260	$ 480	$ 470	$ 396	$ 180	$ 3,959