COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended	9 Months Ended
	Apr. 30, 2020	Sep. 30, 2023		Jun. 30, 2023	Dec. 31, 2022		Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Feb. 04, 2020
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Allowance for credit losses		$ 20,252	[1]	$ 20,172	$ 19,659	[1]	$ 18,631	$ 17,485	$ 21,025
Participating credit facility receivable, ownership interest, amount										$ 4,200
Participating credit facility receivable, amount										$ 36,000
Unfunded Loan Commitment
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Allowance for credit losses		1,054		1,041	0		$ 0	0	0
Cumulative effect adjustment for the adoption of ASC 326
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Allowance for credit losses					374
Cumulative effect adjustment for the adoption of ASC 326 | Unfunded Loan Commitment
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Allowance for credit losses				$ 0	$ 1,082			$ 0	$ 0
Pioneer Bank Litigation
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Litigation settlement, recovery received	$ 500
Loss contingency, damages sought		$ 3,700

[1] Effective January 1, 2023, the allowance calculation is based upon Current Expected Credit loss methodology. Prior to January 1, 2023, the allowance calculation was based upon incurred loss methodology. Refer to Note 1 for further discussion.