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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Effect of cash flow hedging and fair value (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Loans
Derivative Instruments, Gain (Loss) [Line Items]
Income and expense line items presented in the consolidated statements of income	$ 39,470	$ 34,560
Securities and other
Derivative Instruments, Gain (Loss) [Line Items]
Income and expense line items presented in the consolidated statements of income	6,353	5,791
Deposits
Derivative Instruments, Gain (Loss) [Line Items]
Income and expense line items presented in the consolidated statements of income	14,532	5,265
Borrowings
Derivative Instruments, Gain (Loss) [Line Items]
Income and expense line items presented in the consolidated statements of income	3,236	4,180
Non-interest Income
Derivative Instruments, Gain (Loss) [Line Items]
Income and expense line items presented in the consolidated statements of income	8,586	9,184
Interest rate swap on wholesale funding | Cash flow hedges | Borrowings
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on cash flow hedges:	827	664
Interest rate swap on variable rate loans | Cash flow hedges | Loans
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on cash flow hedges:	(585)	(466)
Interest rate swap on securities | Fair Value Hedging | Securities and other
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on fair value hedges:	$ 370	$ 286

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
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-Name Accounting Standards Codification
-Section 50
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Total amount of gain (loss) derived from fair value hedges recognized in earnings in the period.

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Amount, after tax and reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness, attributable to parent.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
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