Business Combinations and Divestitures - Summary of Carrying Amount of Assets in Disposal Group and Gain on Sale (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Apr. 20, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Carrying amount of liabilities in the disposal group:
Gain on sale of division, net of transaction costs		$ 0	$ 0	$ 9,758	$ 0
Triumph Premium Finance
Carrying amount of assets in the disposal group:
Loans	$ 84,504
Premises and equipment, net	45
Other assets	11
Total carrying amount	84,560
Carrying amount of liabilities in the disposal group:
Other liabilities	479
Total carrying amount	84,081
Total consideration received	94,531
Gain on sale of division	10,450
Transaction costs	692
Gain on sale of division, net of transaction costs	$ 9,758