Loans Held for Investment - Narratives - Allowance for loan losses (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for loan losses	$ 1,144,994	$ 0
Loans and Leases Receivable, Allowance	1,144,994	$ 0	$ 0	$ 0
4
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for loan losses	$ 1,100,000