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Business Combinations and Divestitures - Summary of Assets Held for Sale and Consideration Received and Gain on Sale (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |
Total carrying amount |  |  | $ 71,362,000
Gain on sale of subsidiary, net of transaction costs |  | $ 20,860,000 | 20,860,000
Triumph Healthcare Finance |  |  |
Business Acquisition [Line Items] |  |  |
Loans |  |  | 70,771,000
Allowance for loan and lease losses |  |  | (2,103,000)
Loans, net of allowance for loan and lease losses |  |  | 68,668,000
Premises and equipment, net |  |  | 33,000
Goodwill |  |  | 1,024,000
Intangible assets, net |  |  | 1,007,000
Other assets |  |  | 630,000
Total carrying amount |  |  | 71,362,000
Triumph Capital Advisors, LLC |  |  |
Business Acquisition [Line Items] |  |  |
Cash | $ 10,554,000 | 10,554,000 |
Loan receivable | 10,500,000 | 10,500,000 |
Revenue share | 1,623,000 | 1,623,000 | $ 1,737,000
Total consideration received | 22,677,000 | $ 22,677,000 |
Carrying value of TCA membership interest | 1,417,000 |  |
Gain on sale of subsidiary | 21,260,000 |  |
Transaction costs | 400,000 |  |
Gain on sale of subsidiary, net of transaction costs | $ 20,860,000 |  |

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