Loans Receivable, Net - Loans Receivable Based On Our Internal Risk Ratings, Separated By Year Of Origination (Parenthetical) (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Held-to-maturity	$ 77,636	$ 75,722
2018 Single Asset Securitization [Member]
Debt Securities, Held-to-maturity	$ 77,600	$ 75,700