DERIVATIVES AND HEDGING (Derivatives Designated as Hedging, by Balance Sheet Location) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	$ 43,821	$ 37,119
Liability Derivatives, Fair Value	65,032	63,634
Derivative Assets, Amounts offsett in the Statement of Financial Condition	(20,012)	(17,780)
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash, Offset Against Derivative Asset	0	0
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset	$ 918	$ 8,705
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Accrued expenses and other liabilities	Accrued expenses and other liabilities
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional/Contract Amount	$ 487,865	$ 474,502
Liability Derivatives, Notional/Contract Amount	481,942	503,381
Not Designated as Hedging Instrument [Member] | Other assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	24,147	19,481
Not Designated as Hedging Instrument [Member] | Other liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives, Fair Value	45,982	37,335
Interest rate swaps [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	43,821	37,119
Liability Derivatives, Fair Value	65,032	63,634
Derivative Assets, Amounts offsett in the Statement of Financial Condition	(20,012)	(17,780)
Interest rate swaps [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional/Contract Amount	0	0
Liability Derivatives, Notional/Contract Amount	400,000	400,000
Interest rate swaps [Member] | Designated as Hedging Instrument [Member] | Other assets [Member] | Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	0	0
Interest rate swaps [Member] | Designated as Hedging Instrument [Member] | Other liabilities [Member] | Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Liability Derivatives, Fair Value	21,166	26,485
Interest rate swaps [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional/Contract Amount	431,935	440,731
Liability Derivatives, Notional/Contract Amount	431,935	440,731
Interest rate swaps [Member] | Not Designated as Hedging Instrument [Member] | Other assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	43,821	37,119
Interest rate swaps [Member] | Not Designated as Hedging Instrument [Member] | Other liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives, Fair Value	43,866	37,150
Loan Participations and Assignments | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional/Contract Amount	1,108	1,283
Liability Derivatives, Notional/Contract Amount	45,639	47,283
Loan Participations and Assignments | Not Designated as Hedging Instrument [Member] | Other assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	0	0
Loan Participations and Assignments | Not Designated as Hedging Instrument [Member] | Other liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives, Fair Value	19	67
Mortgage loan commitments [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional/Contract Amount	26,278	15,920
Liability Derivatives, Notional/Contract Amount	0	12,367
Mortgage loan commitments [Member] | Not Designated as Hedging Instrument [Member] | Other assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	102	81
Mortgage loan commitments [Member] | Not Designated as Hedging Instrument [Member] | Other liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives, Fair Value	0	42
Forward Contracts [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional/Contract Amount	28,544	16,568
Liability Derivatives, Notional/Contract Amount	4,368	3,000
Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] | Other assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	236	61
Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] | Other liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives, Fair Value	$ 25	$ 76