Loans Receivable, Net - Loans Receivable Based On Our Internal Risk Ratings, Separated By Year Of Origination (Parenthetical) (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Held-to-maturity	$ 75,722	$ 86,638
Two Thousand And Eighteen Single Asset Securitization [Member]
Debt Securities, Held-to-maturity	$ 75,700