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Related-Party Transactions - Additional Information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Related Party Transaction [Line Items] |  |  |
Aggregate principal balance | $ 9,781,000 |  |
Percentage of outstanding orincipal balance | 100.00% |  |
Related Party Transactions, Gain Loss | $ 0 |  |
Amount of deposits held | 6,176,000 | $ 9,360,000 |
Held to Maturity Securities, Amortized Cost | 8,487,000 | 8,557,000 |
Collateralized Loan Obligation Funds |  |  |
Related Party Transaction [Line Items] |  |  |
Held to Maturity Securities, Amortized Cost | 8,487,000 | 8,557,000 |
Collateralized Loan Obligation Funds | Trinitas IV, V and VI |  |  |
Related Party Transaction [Line Items] |  |  |
Held to Maturity Securities, Amortized Cost | 8,487,000 | 8,557,000 |
Asset Management |  |  |
Related Party Transaction [Line Items] |  |  |
Revenue |  | 1,717,000 | $ 6,574,000
Asset Management | Trinitas |  |  |
Related Party Transaction [Line Items] |  |  |
Revenue | $ 0 | $ 521,000 | $ 907,000

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