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OTHER BORROWINGS - Components of Other Borrowings (Parenthetical) (Detail) - Junior Subordinated Debt [Member] - London Interbank Offered Rate (LIBOR) [Member] | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021 | Dec. 31, 2020
due June 17, 2034 [Member] | Statutory Trust One [Member] |  |  |
Subordinated Borrowing [Line Items] |  |  |
Floating Interest rate on junior subordinated debentures | 2.87% | 2.87% | 2.98%
Callable step-rate notes rate | 2.75% |  |
Debt Instrument Description Of Variable Rate Basis | 3-month LIBOR |  |
Subordinated Borrowing Due Date |  | Jun. 17, 2034 |
due September 20, 2034 [Member] | Statutory Trust Two [Member] |  |  |
Subordinated Borrowing [Line Items] |  |  |
Floating Interest rate on junior subordinated debentures | 2.62% | 2.62% | 2.74%
Callable step-rate notes rate | 2.50% |  |
Debt Instrument Description Of Variable Rate Basis | 3-month LIBOR |  |
Subordinated Borrowing Due Date |  | Sep. 20, 2034 |

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