SECURITIES (Narrative) (Details) $ in Thousands	3 Months Ended
	Sep. 30, 2022 USD ($)	Mar. 31, 2022 USD ($) bankLocation	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Debt securities, held-to-maturity, transferred from available-for-sale, book value	$ 934,500
OCI, debt securities, held-to-maturity, transferred from available-for-sale, unrealized gain (loss), after tax	186,300
Accrued interest receivable			$ 28,000	$ 33,000
Debt securities, held-to-maturity, sold | bankLocation		2
Debt securities, held-to-maturity, sale		$ 2,200
Gain (loss) on sale of investments		$ 100
FHLB stock			25,800	12,300
Held to maturity securities, fair value			0	0
Obligations of states and political subdivisions
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Held to maturity securities, fair value			0	0
Municipal Bonds
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Debt securities, held-to-maturity, transferred from available-for-sale, fair value	$ 748,300
Collateral Pledged
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Securities pledged as collateral			$ 2,630,000	$ 1,490,000