Borrowings - Obligations Under Capital Lease (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Leases
Average balance	$ 19,406	$ 5,848
Weighted average interest rate	3.36%	4.50%
Total interest expense	$ 167	$ 66
Unpaid principal balance	$ 18,145		$ 20,810
Weighted average interest rate	3.18%		3.74%
Furniture, fixtures, equipment and building improvements pledged to creditors	$ 7,392		$ 20,406
Capitalized software pledged to creditors	10,606		$ 12,192
Maximum
Leases
Maximum daily amount outstanding	$ 20,810	$ 6,605