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Business Combinations and Divestitures - Summary of Assets Held for Sale and Consideration Received and Gain on Sale (Details) - USD ($)
 9 Months Ended
Mar. 16, 2018
Mar. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Business Acquisition [Line Items]          
Total carrying amount         $ 71,362,000
Gain on sale of subsidiary or division, net of transaction costs     $ 1,071,000 $ 20,860,000  
Triumph Healthcare Finance          
Business Acquisition [Line Items]          
Loans $ 70,147,000        
Premises and equipment, net 19,000        
Goodwill 1,457,000        
Intangible assets, net 958,000        
Other assets 197,000        
Total carrying amount 72,778,000        
Total consideration received 74,017,000        
Gain on sale of subsidiary or division 1,239,000        
Transaction costs 168,000        
Gain on sale of subsidiary or division, net of transaction costs $ 1,071,000        
Triumph Capital Advisors, LLC          
Business Acquisition [Line Items]          
Cash   $ 10,554,000      
Loan receivable   10,500,000      
Revenue share   1,623,000 $ 1,725,000    
Total consideration received   22,677,000      
Carrying value of TCA membership interest   1,417,000      
Gain on sale of subsidiary or division   21,260,000      
Transaction costs   400,000      
Gain on sale of subsidiary or division, net of transaction costs   $ 20,860,000