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Business Combinations and Divestitures - Summary of Assets Held for Sale and Consideration Received and Gain on Sale (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2017
Dec. 31, 2017
Business Acquisition [Line Items]      
Total carrying amount     $ 71,362,000
Gain on sale of subsidiary, net of transaction costs   $ 20,860,000 20,860,000
Triumph Healthcare Finance      
Business Acquisition [Line Items]      
Loans     70,771,000
Allowance for loan and lease losses     (2,103,000)
Loans, net of allowance for loan and lease losses     68,668,000
Premises and equipment, net     33,000
Goodwill     1,024,000
Intangible assets, net     1,007,000
Other assets     630,000
Total carrying amount     71,362,000
Triumph Capital Advisors, LLC      
Business Acquisition [Line Items]      
Cash $ 10,554,000 10,554,000  
Loan receivable 10,500,000 10,500,000  
Revenue share 1,623,000 1,623,000 $ 1,737,000
Total consideration received 22,677,000 $ 22,677,000  
Carrying value of TCA membership interest 1,417,000    
Gain on sale of subsidiary 21,260,000    
Transaction costs 400,000    
Gain on sale of subsidiary, net of transaction costs $ 20,860,000