Loans Receivable - Allowance For Credit Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for expected credit losses at January 1, 2020	$ 5,437	$ 2,146
Financing receivable, allowance for credit loss	1,718	5,437
Provision for expected credit losses	(3,719)	3,648
Allowance for expected credit losses at September 30, 2020	1,718	5,437
Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for expected credit losses at January 1, 2020	1,683	1,502
Financing receivable, allowance for credit loss	1,362	1,683
Provision for expected credit losses	(321)	1,086
Allowance for expected credit losses at September 30, 2020	1,362	1,683
Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for expected credit losses at January 1, 2020	3,754	644
Financing receivable, allowance for credit loss	356	3,754
Provision for expected credit losses	(3,398)	2,562
Allowance for expected credit losses at September 30, 2020	356	3,754
Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for expected credit losses at January 1, 2020	0	(357)
Financing receivable, allowance for credit loss		0
Allowance for expected credit losses at September 30, 2020		0
Cumulative Effect, Period Of Adoption, Adjustment | Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for expected credit losses at January 1, 2020	0	(905)
Financing receivable, allowance for credit loss		0
Allowance for expected credit losses at September 30, 2020		0
Cumulative Effect, Period Of Adoption, Adjustment | Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for expected credit losses at January 1, 2020	$ 0	548
Financing receivable, allowance for credit loss		0
Allowance for expected credit losses at September 30, 2020		$ 0