Other Asset and Other Liabilities - Intangible assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Finite-lived intangible assets	$ 5,662
Total Intangible Assets	6,662		$ 6,986
Amortization expense		$ 300
Total Accumulated Amortization	2,921
Future amortization of lease intangibles
2021	971
2022	1,268
2023	1,242
2024	1,032
2025	786
2026	119
Thereafter	244
Net amount	5,662
SBA license
Indefinite-lived intangible assets	1,000		1,000
Internally developed software | Knight Capital
Finite-lived intangible assets	$ 2,903		3,061
Estimated Useful Life	6 years
Total Accumulated Amortization	$ 897
Future amortization of lease intangibles
Net amount	2,903		3,061
Broker network | Knight Capital
Finite-lived intangible assets	$ 822		889
Estimated Useful Life	4 years 6 months
Total Accumulated Amortization	$ 378
Future amortization of lease intangibles
Net amount	822		889
Trade name | Knight Capital
Finite-lived intangible assets	$ 672		709
Estimated Useful Life	6 years
Total Accumulated Amortization	$ 208
Future amortization of lease intangibles
Net amount	672		709
Trade name | GMFS
Finite-lived intangible assets	$ 529		559
Estimated Useful Life	15 years
Total Accumulated Amortization	$ 694
Future amortization of lease intangibles
Net amount	529		559
Favorable lease
Finite-lived intangible assets	$ 736		768
Estimated Useful Life	12 years
Total Accumulated Amortization	$ 744
Future amortization of lease intangibles
Net amount	$ 736		$ 768