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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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Amount of investment in debt security measured at amortized cost (held-to-maturity).

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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