INVESTMENT SECURITIES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-Sale [Line Items]
Total assets carried at fair value		$ 1,528,051	$ 1,483,042
Charge off	$ 1,200
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]		Other assets	Other assets
Accrued interest receivable		$ 31,600	$ 35,100
Traditional securities
Debt Securities, Available-for-Sale [Line Items]
Total assets carried at fair value		1,445,793	$ 1,429,739
Traditional securities | Federal Home Loan Bank Advances | Asset Pledged as Collateral
Debt Securities, Available-for-Sale [Line Items]
Total assets carried at fair value		1,280,000
Traditional securities | Federal Home Loan Bank Advances | Asset Pledged as Collateral without Right
Debt Securities, Available-for-Sale [Line Items]
Held to maturity, at fair value		$ 544,500