Loans Receivable - Allowance For Credit Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for expected credit losses, beginning of period	$ 1,718	$ 5,437
Cumulative effect adjustment resulting from changes in accounting principles	1,429	4,198
Provision for expected credit losses	(289)	(1,239)
Allowance for expected credit losses, end of period	1,429	4,198
Real estate loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for expected credit losses, beginning of period	1,362	1,683
Cumulative effect adjustment resulting from changes in accounting principles	1,295	1,608
Provision for expected credit losses	(67)	(75)
Allowance for expected credit losses, end of period	1,295	1,608
Commercial loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for expected credit losses, beginning of period	356	3,754
Cumulative effect adjustment resulting from changes in accounting principles	134	2,590
Provision for expected credit losses	(222)	(1,164)
Allowance for expected credit losses, end of period	$ 134	$ 2,590