DEPOSITS - Additional Information (Details) - USD ($) $ in Millions |
Sep. 30, 2021 |
Dec. 31, 2020 |
|---|---|---|
| DEPOSITS | ||
| Certificates of deposits of $250,000 or more, maturities within one year | $ 342 | $ 409 |
| Certificates of deposits of $250,000 or more, maturities after one year | 2 | 7 |
| Certificates of deposits of $250,000 or more, total | 344 | 416 |
| Certificates of deposit of less than $ 250,000, maturities within one year | 260 | 520 |
| Certificates of deposit of less than $ 250,000, maturities after one year | 9 | 43 |
| Certificates of deposit of less than $250,000, total | $ 269 | $ 563 |