Investment Securities (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended								3 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2011	Jul. 01, 2011	Dec. 31, 2010	Sep. 30, 2012 Moody'S, Ca Rating [Member]	Dec. 31, 2011 Moody'S, Ca Rating [Member]	Sep. 30, 2012 Tpref Funding Ii [Member] Moody'S Caa3 Rating [Member]	Jun. 30, 2012 Tpref Funding Ii [Member] Moody'S Caa3 Rating [Member]	Mar. 31, 2012 Tpref Funding Ii [Member] Moody'S Caa3 Rating [Member]	Sep. 30, 2012 Alesco Viii [Member] Moody'S, Ca Rating [Member]	Jun. 30, 2012 Alesco Viii [Member] Moody'S, Ca Rating [Member]	Mar. 31, 2012 Alesco Viii [Member] Moody'S, Ca Rating [Member]	Sep. 30, 2012 Preferred Term Security Xxvii [Member] Moody'S, C Rating [Member]	Jun. 30, 2012 Preferred Term Security Xxvii [Member] Moody'S, C Rating [Member]	Mar. 31, 2012 Preferred Term Security Xxvii [Member] Moody'S, C Rating [Member]	Sep. 30, 2012 Trapeza Cdo I [Member] Moody'S, Ca Rating [Member]	Jun. 30, 2012 Trapeza Cdo I [Member] Moody'S, Ca Rating [Member]	Mar. 31, 2012 Trapeza Cdo I [Member] Moody'S, Ca Rating [Member]	Sep. 30, 2012 Alesco Preferred Funding Viii [Member] Not Rated [Member]	Jun. 30, 2012 Alesco Preferred Funding Viii [Member] Not Rated [Member]	Mar. 31, 2012 Alesco Preferred Funding Viii [Member] Not Rated [Member]	Sep. 30, 2012 Alesco Preferred Funding Ix [Member] Not Rated [Member]	Jun. 30, 2012 Alesco Preferred Funding Ix [Member] Not Rated [Member]	Mar. 31, 2012 Alesco Preferred Funding Ix [Member] Not Rated [Member]
Beginning Balance	$ 3,171	$ 3,171	$ 3,251	$ 3,251	$ 3,251	$ 3,249	$ 80	$ 80	$ 318	$ 318	$ 318	$ 1,000	$ 1,000	$ 1,000	$ 78	$ 78	$ 78	$ 857	$ 857	$ 857	$ 453	$ 453	$ 453	$ 465	$ 465	$ 465
Addition Qtr	0	0	0						0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Ending Balance	$ 3,171	$ 3,171	$ 3,171	$ 3,251	$ 3,251	$ 3,249	$ 80	$ 80	$ 318	$ 318	$ 318	$ 1,000	$ 1,000	$ 1,000	$ 78	$ 78	$ 78	$ 857	$ 857	$ 857	$ 453	$ 453	$ 453	$ 465	$ 465	$ 465