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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Summary Of Significant Accounting Policies [Line Items] |  |  |
Cash and cash equivalent maturity period |  | 90 days |
Number of days within which accrual of interest income discontinues |  | 90 days |
Period of consumer loans charged off |  | 120 days |
Useful life of assets |  | 60 months |
Goodwill impairment |  | $ 0 | $ 0
Minimum probability for recognizing tax benefit |  | 50.00% |
Unrecognized tax benefits |  | $ 0 | $ 0
Triumph Capital Advisors, LLC |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Percentage of membership interests sold | 100.00% |  |
Minimum | ASU 2016-02 |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Percentage of decrease in tier 1 capital to risk weighted assets ratio due to adoption of ASU |  | 0.05% |
Operating lease right-of-use asset |  | $ 21,000,000 |
Operating lease liability |  | $ 21,000,000 |
Maximum | ASU 2016-02 |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Percentage of decrease in tier 1 capital to risk weighted assets ratio due to adoption of ASU |  | 0.07% |
Operating lease right-of-use asset |  | $ 23,000,000 |
Operating lease liability |  | $ 23,000,000 |
Buildings and Improvements | Minimum |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful life of assets |  | 30 years |
Buildings and Improvements | Maximum |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful life of assets |  | 40 years |
Furniture, Fixtures and Equipment | Minimum |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful life of assets |  | 3 years |
Furniture, Fixtures and Equipment | Maximum |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful life of assets |  | 10 years |
Automobiles |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful life of assets |  | 5 years |
Aircraft |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful life of assets |  | 20 years |

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