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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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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

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- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

Date the payments are due on subordinated debt, in CCYY-MM-DD format.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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