Loans Portfolio - Loan Risk Ratings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Jan. 01, 2021
Financing Receivable Allowance For Credit Losses [Line Items]
Weighted-average risk rating on loan exposure	3.10%	3.10%
Loans receivable held-for-investment	$ 6,407,305	$ 6,131,825	$ 64,274
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	32.10%	40.30%
Risk Rating Four
Financing Receivable Allowance For Credit Losses [Line Items]
Loans receivable held-for-investment	$ 1,200,000	$ 1,400,000
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	17.50%	21.10%
Risk Rating Five
Financing Receivable Allowance For Credit Losses [Line Items]
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	0.40%	0.20%