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Related Party Transactions - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |  | 1 Months Ended |  | 3 Months Ended | 1 Months Ended | 12 Months Ended |  |  |  |
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Aug. 27, 2010 Related parties [Member] | Sep. 30, 2012 Subordinated Notes [Member] | Dec. 31, 2010 Subordinated Notes [Member] | Aug. 27, 2010 Subordinated Notes [Member] | Sep. 30, 2012 Resource Securities, Inc. [Member] | Mar. 31, 2010 Rights offering [Member] | Mar. 31, 2010 RAIT [Member] | Jun. 30, 2010 Star Asia [Member] | Mar. 31, 2010 Star Asia [Member] Rights offering [Member] | Mar. 31, 2010 Star Asia SPV [Member] Rights offering [Member] | Dec. 31, 2010 Cohen & Company Securities, LLC [Member] | Aug. 27, 2010 Cohen & Company Securities, LLC [Member] Subordinated Notes [Member] | Aug. 27, 2010 Daniel G.Cohen [Member] Subordinated Notes [Member] Related parties [Member] | Aug. 27, 2010 Christopher Ricciardi [Member] Subordinated Notes [Member] Related parties [Member] | Aug. 27, 2010 Messrs. Cohen [Member] Subordinated Notes [Member] | Aug. 27, 2010 Ricciardi [Member] Subordinated Notes [Member] | Dec. 31, 2012 TBBK [Member] | Dec. 31, 2011 TBBK [Member] | Dec. 31, 2012 Star Asia Special Situations Fund [Member]
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares sold |  |  |  |  |  |  |  |  |  | 510,434 |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of shares |  |  |  |  |  |  |  |  |  | $ 669 |  |  |  |  |  |  |  |  |  |  |  |
Unrealized loss on shares sold | 1,310 | 1,084 |  |  |  |  |  |  |  | 8,950 |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 36 | 91 |
Shares purchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,400 |  |
Common stock value in open market |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26 |  |
Fair market value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26 |  |
Initial investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,841
Number of common shares or units purchased |  |  |  |  |  |  |  |  |  |  |  | 2,279,820 | 1,139,910 |  |  |  |  |  |  |  |  |
Value of common shares or units purchased |  |  |  |  |  |  |  |  | 5,392 |  |  | 1,334 | 4,058 |  |  |  |  |  |  |  |  |
Distribution in-kind, value |  |  |  |  |  |  |  |  |  |  | 55 |  |  |  |  |  |  |  |  |  |  |
Distribution in-kind, shares |  |  |  |  |  |  |  |  |  |  | 109,890 |  |  |  |  |  |  |  |  |  |  |
Principal balance of Subordinated Notes |  |  |  | 3,863 | 1,177 |  |  |  |  |  |  |  |  |  | 8,081 | 2,636 | 1,164 |  |  |  |  |
Purchase price including accrued interest |  |  |  |  | 1,139 |  | 6,762 |  |  |  |  |  |  |  | 6,762 |  |  | 2,206 | 975 |  |  |
Gain on repurchase of debt | 86 | 33 | 2,555 |  | 83 | 1,632 |  |  |  |  |  |  |  | 1,632 |  |  |  |  |  |  |  |
Introducing agent fee expense |  |  |  |  |  |  |  | $ 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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