INVESTMENT SECURITIES - Narrative (Details) - USD ($) $ in Thousands	6 Months Ended	9 Months Ended	12 Months Ended
	Jun. 30, 2024	Sep. 30, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Debt securities pledged as collateral		$ 36,900	$ 45,100
Shareholder equity held by one issuer (as a percent)		10.00%	10.00%
Accrued interest receivable		$ 10,455	$ 11,428
Bank Technology Fund
Debt Securities, Available-for-sale [Line Items]
Contractual obligation				$ 6,000
Return of capital, received		200
Balance with SBIC included in other assets		2,300	2,000
Committed investments to be made in the future		3,700
Debt securities pledged as collateral		9,500	39,300
Bank Technology Fund | Other Assets
Debt Securities, Available-for-sale [Line Items]
Contribution to committed investments		300	800
Return of capital, received			100
Small Business Investment Company ("SBIC")
Debt Securities, Available-for-sale [Line Items]
Contractual obligation		600
Small Business Investment Company ("SBIC") | Other Assets
Debt Securities, Available-for-sale [Line Items]
Contribution to committed investments	$ 200	200
Balance with SBIC included in other assets		2,400	2,200
Held-to-Maturity Securities
Debt Securities, Available-for-sale [Line Items]
Accrued interest receivable		$ 500	$ 400