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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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- Definition

Amount of fixed fee revenue for the management of an investment fund portfolio. Excludes investment advisory, distribution and servicing, and performance fees.

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- Definition

Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.6)
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Amount of deposits held by the entity for a related party (entity, shareholder, employee).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k))
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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