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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. 16, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |
Total carrying amount |  |  |  |  |  | $ 71,362,000
Gain on sale of subsidiary or division, net of transaction costs |  |  | $ 1,071,000 | $ 20,860,000 | $ 1,071,000 | $ 20,860,000
Triumph Healthcare Finance |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Loans | $ 70,147,000 |  |  |  |  |
Premises and equipment, net | 19,000 |  |  |  |  |
Goodwill | 1,457,000 |  |  |  |  |
Intangible assets, net | 958,000 |  |  |  |  |
Other assets | 197,000 |  |  |  |  |
Total carrying amount | 72,778,000 |  |  |  |  |
Total consideration received | 74,017,000 |  |  |  |  |
Gain on sale of subsidiary or division | 1,239,000 |  |  |  |  |
Transaction costs | 168,000 |  |  |  |  |
Gain on sale of subsidiary or division, net of transaction costs | $ 1,071,000 |  |  |  |  |
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 | $ 1,774,000 |
Total consideration received |  | 22,677,000 |  | $ 22,677,000 |  |
Carrying value of TCA membership interest |  | 1,417,000 |  |  |  |
Gain on sale of subsidiary or division |  | 21,260,000 |  |  |  |
Transaction costs |  | 400,000 |  |  |  |
Gain on sale of subsidiary or division, net of transaction costs |  | $ 20,860,000 |  |  |  |

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