Impairment of Investment Securities (Details 1) (USD $) In Thousands, unless otherwise specified																		6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 Preferred Collateralized Debt Obligations Total [Member]	Jun. 30, 2012 Preferred Collateralized Debt Obligations Total [Member] Pre TSL I [Member] Senior [Member]	Jun. 30, 2012 Preferred Collateralized Debt Obligations Total [Member] Pre TSL IV [Member] Mezzanine [Member]	Jun. 30, 2012 Preferred Collateralized Debt Obligations Total [Member] Pre TSL V [Member] Mezzanine [Member]	Jun. 30, 2012 Preferred Collateralized Debt Obligations Total [Member] Pre TSL VI [Member] Mezzanine [Member]	Jun. 30, 2012 Preferred Collateralized Debt Obligations Total [Member] Pre TSL VII [Member] Mezzanine [Member]	Jun. 30, 2012 Preferred Collateralized Debt Obligations Total [Member] Pre TSL VIII [Member] Mezzanine [Member]	Jun. 30, 2012 Preferred Collateralized Debt Obligations Total [Member] Pre TSL IX [Member] Mezzanine [Member]	Jun. 30, 2012 Preferred Collateralized Debt Obligations Total [Member] Pre TSL X [Member] Mezzanine [Member]	Jun. 30, 2012 Preferred Collateralized Debt Obligations Total [Member] Pre TSL XII [Member] Mezzanine [Member]	Jun. 30, 2012 Preferred Collateralized Debt Obligations Total [Member] Pre TSL XIII [Member] Mezzanine [Member]	Jun. 30, 2012 Preferred Collateralized Debt Obligations Total [Member] Pre TSL XIV [Member] Mezzanine [Member]	Jun. 30, 2012 Preferred Collateralized Debt Obligations Total [Member] MMCap I [Member] Senior [Member]	Jun. 30, 2012 Preferred Collateralized Debt Obligations Total [Member] MMCap I [Member] Mezzanine [Member]	Jun. 30, 2012 Preferred Collateralized Debt Obligations Total [Member] MM Comm IX [Member] Mezzanine [Member]	Jun. 30, 2012 Preferred Collateralized Debt Obligations Total [Member] Fitch C and Fitch D Rating [Member] Pre TSL V [Member] Mezzanine [Member] Bank	Jun. 30, 2012 Moody's, Aa3 Rating [Member] Preferred Collateralized Debt Obligations Total [Member] Fitch, BBB Rating [Member] Pre TSL I [Member] Senior [Member] Bank	Jun. 30, 2012 Moody's, Ca Rating [Member] Preferred Collateralized Debt Obligations Total [Member] Fitch, C Rating [Member] Pre TSL VII [Member] Mezzanine [Member] Bank	Jun. 30, 2012 Moody's, Ca Rating [Member] Preferred Collateralized Debt Obligations Total [Member] Fitch, C Rating [Member] Pre TSL IX [Member] Mezzanine [Member] Bank	Jun. 30, 2012 Moody's, Ca Rating [Member] Preferred Collateralized Debt Obligations Total [Member] Fitch, C Rating [Member] Pre TSL XII [Member] Mezzanine [Member] Bank	Jun. 30, 2012 Moody's, Ca Rating [Member] Preferred Collateralized Debt Obligations Total [Member] Fitch, C Rating [Member] Pre TSL XIII [Member] Mezzanine [Member] Bank	Jun. 30, 2012 Moody's, Ca Rating [Member] Preferred Collateralized Debt Obligations Total [Member] Fitch, C Rating [Member] Pre TSL XIV [Member] Mezzanine [Member] Bank	Jun. 30, 2012 Moody's, Ca Rating [Member] Preferred Collateralized Debt Obligations Total [Member] Fitch, C Rating [Member] MMCap I [Member] Mezzanine [Member] Bank	Jun. 30, 2012 Moody's, Ca Rating [Member] Preferred Collateralized Debt Obligations Total [Member] Fitch, D Rating [Member] Pre TSL VI [Member] Mezzanine [Member] Bank	Jun. 30, 2012 Moody's, Ca Rating [Member] Preferred Collateralized Debt Obligations Total [Member] Fitch, D Rating [Member] MM Comm IX [Member] Mezzanine [Member] Bank	Jun. 30, 2012 Moody's, Caa2 Rating [Member] Preferred Collateralized Debt Obligations Total [Member] Fitch, CCC Rating [Member] Pre TSL IV [Member] Mezzanine [Member] Bank	Jun. 30, 2012 Moody's, C Rating [Member] Preferred Collateralized Debt Obligations Total [Member] Fitch, C Rating [Member] Pre TSL VIII [Member] Mezzanine [Member] Bank	Jun. 30, 2012 Moody's, C Rating [Member] Preferred Collateralized Debt Obligations Total [Member] Fitch, C Rating [Member] Pre TSL X [Member] Mezzanine [Member] Bank	Jun. 30, 2012 Moody's, A3 Rating [Member] Preferred Collateralized Debt Obligations Total [Member] Fitch, BBB Rating [Member] MMCap I [Member] Senior [Member] Bank
Pooled Trust Preferred Collateralized Debt Obligations
Available for sale securities book value	$ 0		$ 52,889	$ 1,581	$ 1,830	$ 51	$ 152	$ 4,062	$ 1,735	$ 2,250	$ 1,399	$ 5,486	$ 12,258	$ 12,942	$ 1,898	$ 844	$ 6,401
Fair Value of Investment Securities	1,159,202	1,142,776	21,792	1,545	622	54	302	2,939	981	766	1,026	2,698	3,820	4,158	1,807	448	626
Unrealized Gain (Loss)			$ (31,097)	$ (36)	$ (1,208)	$ 3	$ 150	$ (1,123)	$ (754)	$ (1,484)	$ (373)	$ (2,788)	$ (8,438)	$ (8,784)	$ (91)	$ (396)	$ (5,775)
Number of Banks																		3	20	17	47	74	63	63	20	5	31	6	35	51	20
Deferrals and Defaults as a Percentage of Current Collateral																		100.00%	39.50%	52.13%	25.88%	33.05%	39.60%	38.42%	38.89%	12.27%	38.14%	27.07%	45.91%	38.24%	38.89%
Excess Subordination as a Percentage of Current Performing Collateral																		0.00%	217.29%	0.00%	8.19%	0.00%	0.00%	31.74%	11.77%	205.63%	0.00%	96.48%	0.00%	0.00%	282.43%

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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