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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. 16, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2018
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 $ 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   10,554,000    
Loan receivable   10,500,000   10,500,000    
Revenue share   1,623,000   1,623,000 $ 1,774,000  
Total consideration received   22,677,000   $ 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