Borrowings - Obligations Under Capital Lease (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Leases
Average balance	$ 15,179	$ 25,812	$ 17,253	$ 13,380
Weighted average interest rate	2.16%	4.47%	2.69%	4.48%
Total interest expense	$ 83	$ 274	$ 354	$ 476
Unpaid principal balance	$ 13,957		$ 13,957		$ 20,810
Weighted average interest rate	2.15%		2.15%		3.74%
Furniture, fixtures, equipment and building improvements pledged to creditors	$ 6,088		$ 6,088		$ 20,406
Capitalized software pledged to creditors	8,862		8,862		$ 12,192
Maximum
Leases
Maximum daily amount outstanding	$ 16,749	$ 28,295	$ 20,810	$ 28,295