COPT Defense Properties Annual report pursuant to Section 13 and 15(d)

Investing Receivables (Details) - Investing Receivables - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis	$ 83,825	$ 71,605
Allowance for credit losses	(1,599)	(2,851)	$ 0
Investing receivables, net	82,226	68,754
Notes receivable from the City of Huntsville
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis	77,784	65,564
Other investing loans receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost basis	$ 6,041	$ 6,041

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

Amount, before allowance for credit loss, of financing receivable.