Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands	Sep. 30, 2020 USD ($) investment loan	Jul. 01, 2020 USD ($)	Mar. 27, 2020 USD ($)	Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of equity method investments | investment	1
Loan balance	$ 1,430,324			$ 1,374,235
Intercoastal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of common interest acquired		47.00%
Preferred units acquired		$ 7,500
SBA Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans | loan	455
Loan balance	$ 87,900		$ 92,800