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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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