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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		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Loans
Derivative Instruments, Gain (Loss) [Line Items]
Income and expense line items presented in the consolidated statements of income	$ 24,581	$ 23,191	$ 47,252	$ 47,396
Securities and other
Derivative Instruments, Gain (Loss) [Line Items]
Income and expense line items presented in the consolidated statements of income	4,207	3,992	8,033	7,971
Deposits
Derivative Instruments, Gain (Loss) [Line Items]
Income and expense line items presented in the consolidated statements of income	1,195	2,603	2,384	5,554
Borrowings
Derivative Instruments, Gain (Loss) [Line Items]
Income and expense line items presented in the consolidated statements of income	1,074	1,826	2,084	3,637
Non-interest Income
Derivative Instruments, Gain (Loss) [Line Items]
Income and expense line items presented in the consolidated statements of income	8,961	9,505	18,270	19,753
Interest rate swap on wholesale funding | Cash flow hedges | Borrowings
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on cash flow hedges:	(28)	(196)	(141)	(384)
Interest rate swap on variable rate loans | Cash flow hedges | Loans
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on cash flow hedges:	(17)	89	(1)	97
Interest rate swap on securities | Fair Value Hedging | Securities and other
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on fair value hedges:	$ (68)	$ (140)	$ (203)	$ (276)

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Total amount of gain (loss) derived from fair value hedges recognized in earnings in the period.

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