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Related-Party Transactions - Additional Information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Related Party Transaction [Line Items] |  |  |
Amount of deposits held | $ 9,360,000 | $ 14,634,000 |
Asset management fees | 1,717,000 | 6,574,000 | $ 5,646,000
Held to Maturity Securities, Amortized Cost | 8,557,000 | 29,352,000 |
Trinitas |  |  |
Related Party Transaction [Line Items] |  |  |
Asset management fees | 521,000 | 907,000 | $ 0
Collateralized Loan Obligation Funds |  |  |
Related Party Transaction [Line Items] |  |  |
Held to Maturity Securities, Amortized Cost | 8,557,000 | 3,380,000 |
Collateralized Loan Obligation Funds | Trinitas IV, V and VI |  |  |
Related Party Transaction [Line Items] |  |  |
Held to Maturity Securities, Amortized Cost | $ 8,557,000 | $ 3,380,000 |

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