Other Asset and Other Liabilities - Intangible assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Finite-lived intangible assets	$ 6,978
Total Intangible Assets	7,978		$ 8,309
Amortization expense	300	$ 100
Total Accumulated Amortization	1,604
Future amortization of lease intangibles
2020	992
2021	1,295
2022	1,268
2023	1,242
2024	1,210
Thereafter	971
Net amount	6,978
SBA license
Indefinite-lived intangible assets	1,000		1,000
Internally developed software | Knight Capital
Finite-lived intangible assets	$ 3,536		3,694
Estimated Useful Life	6 years
Total Accumulated Amortization	$ 264
Future amortization of lease intangibles
Net amount	3,536		3,694
Broker network | Knight Capital
Finite-lived intangible assets	$ 1,089		1,156
Estimated Useful Life	4 years 6 months
Total Accumulated Amortization	$ 111
Future amortization of lease intangibles
Net amount	1,089		1,156
Trade name | Knight Capital
Finite-lived intangible assets	$ 819		855
Estimated Useful Life	6 years
Total Accumulated Amortization	$ 61
Future amortization of lease intangibles
Net amount	819		855
Trade name | GMFS
Finite-lived intangible assets	$ 663		699
Estimated Useful Life	15 years
Total Accumulated Amortization	$ 559
Future amortization of lease intangibles
Net amount	663		699
Favorable lease
Finite-lived intangible assets	$ 871		905
Estimated Useful Life	12 years
Total Accumulated Amortization	$ 609
Future amortization of lease intangibles
Net amount	$ 871		$ 905