SECURITIES - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($) security	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) security	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) security
Debt and Equity Securities, FV-NI [Line Items]
Credit loss recognized	$ 0		$ 0		$ 0
Accrued interest receivable	4,400,000		4,400,000		5,200,000
Loans held for investment	5,318,590,000		5,318,590,000		5,170,042,000
Held to maturity, credit loss exposure	216,000		216,000		205,000
Amount of reserve recorded	0		0
Accrued interest receivable of held-to-maturity securities	2,600,000		2,600,000		3,400,000
Held-to-maturity, excluding accrued interest, nonaccrual	0		0		0
Total securities pledged	$ 1,115,000,000		$ 1,115,000,000		$ 1,095,000,000.000
Number of securities in the portfolio that were in an unrealized loss position | security	995		995		1,125
Equity securities	$ 8,200,000		$ 8,200,000		$ 3,100,000
Equity securities unrealized gain (loss)	(222,000)	$ 0	(222,000)	$ 0
Financial Asset, Past Due
Debt and Equity Securities, FV-NI [Line Items]
Loans held for investment	0		0		0
Securities held to maturity past due 30 days	0		0		0
AFS Securities
Debt and Equity Securities, FV-NI [Line Items]
Credit loss recognized	$ 0		$ 0		$ 0