FANNIE MAE COMMITMENTS AND PLEDGED SECURITIES - Agency Multifamily Mortgage Based Securities Pledged Securities (Detail) - Agency Mortgage Backed Securities - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Investments in Agency debt securities
Fair Value	$ 138,789	$ 104,263
Amortized Cost	140,782	100,847
Total gains for securities with net gains in AOCI	762	3,636
Total losses for securities with net losses in AOCI	(2,755)	(220)
Fair value of securities with unrealized losses	116,989	4,757
Maturities - Fair Value
After one year through five years	16,018
After five years through ten years	99,612
After ten years	23,159
Total	138,789	104,263
Maturities - Amortized Cost
After one year through five years	16,063
After five years through ten years	100,327
After ten years	24,392
Total	$ 140,782	$ 100,847