Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Schedule of investments classified as investments-trading
Investments-trading	$ 166,192	$ 124,546
U.S. government agency MBS and CMOs [Member]
Schedule of investments classified as investments-trading
Investments-trading	30,685	7,563
U.S. government agency debt securities [Member]
Schedule of investments classified as investments-trading
Investments-trading	34,452	14,600
RMBS [Member]
Schedule of investments classified as investments-trading
Investments-trading	1,178	7,108
CMBS [Member]
Schedule of investments classified as investments-trading
Investments-trading		1,587
U.S. Treasury securities [Member]
Schedule of investments classified as investments-trading
Investments-trading	7,473	8,524
Interests in securitizations [Member]
Schedule of investments classified as investments-trading
Investments-trading	259	608
SBA loans [Member]
Schedule of investments classified as investments-trading
Investments-trading	4,382	9,049
Corporate bonds and redeemable preferred stock [Member]
Schedule of investments classified as investments-trading
Investments-trading	55,226	65,445
Foreign government bonds [Member]
Schedule of investments classified as investments-trading
Investments-trading	99	67
Municipal bonds [Member]
Schedule of investments classified as investments-trading
Investments-trading	18,895	9,225
Exchange traded funds [Member]
Schedule of investments classified as investments-trading
Investments-trading	9,377
Certificates of deposit [Member]
Schedule of investments classified as investments-trading
Investments-trading	4,079	710
Equity securities [Member]
Schedule of investments classified as investments-trading
Investments-trading	$ 87	$ 60

The total of financial instruments that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for debt and equity securities formerly categorized as available-for-sale or held-to-maturity which the entity held as of the date it opted to account for such securities at fair value. An enterprise may also categorize such a security as trading without the intent to sell it in the near term assuming the decision to categorize the security as trading occurred at acquisition.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.4)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 13

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 12

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 159

-Paragraph 29

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Implementation Guide (Q and A)

-Number FAS115

-Paragraph 35

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details