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ACQUISITIONS (Details) shares in Thousands, $ in Thousands							3 Months Ended					12 Months Ended
ACQUISITIONS (Details) shares in Thousands, $ in Thousands	Jun. 12, 2020 USD ($) Office shares	Sep. 18, 2019 USD ($)	Jul. 12, 2019 USD ($) Office country	Jan. 02, 2019 USD ($)	Apr. 02, 2018 USD ($)	Jan. 02, 2018 USD ($)	Dec. 31, 2020 USD ($) country	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2020 USD ($) country	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Oct. 21, 2019 country
Acquisitions [Abstract]
Cash		$ 500	$ 95,034									$ (34,360)	$ 4,653	$ 1,737
Purchase price of acquisition			95,034
Other liabilities			2,922
Goodwill			39,970				$ 793,708		$ 773,810	$ 733,503		793,708	773,810	733,503
Loans			479,877
Investment securities			39,770
Deposits			(568,161)
Increase in deposits												$ 1,713,733	$ 104,435	$ (122,049)
Vermont [Member]
Acquisitions [Abstract]
Number of counties where the bank has facilities \| country							12					12
Massachusetts [Member]
Acquisitions [Abstract]
Number of counties where the bank has facilities \| country							1					1
Upstate New York [Member]
Acquisitions [Abstract]
Number of counties where the bank has facilities \| country							42					42
Customer Lists [Member]
Acquisitions [Abstract]
Intangibles		$ 500
Other Intangibles [Member]
Acquisitions [Abstract]
Intangibles			1,650
Steuben Trust Corporation [Member]
Acquisitions [Abstract]
Cash	$ 98,600											$ 21,613
Purchase price of acquisition												98,555
Number of branch locations \| Office	11
Issuance of common shares (in shares) \| shares	1,360
Issuance of common shares	$ 21,600
Assets acquired	607,800
Other liabilities							$ 5,095					5,095
Goodwill	20,200						20,235					20,235
Loans	339,700						339,017					339,017
Investment securities	180,500						180,497					180,497
Deposits	516,300						(516,274)					(516,274)
Revenue earned	2,600
Direct expenses	$ 7,700
Steuben Trust Corporation [Member] \| Western New York State [Member]
Acquisitions [Abstract]
Number of new counties where the bank has extended footprints \| country															2
Number of counties where the bank has facilities \| country															4
Steuben Trust Corporation [Member] \| Other Intangibles [Member]
Acquisitions [Abstract]
Intangibles							1,196					1,196
Kinderhook Bank Corp [Member]
Acquisitions [Abstract]
Cash			93,384
Purchase price of acquisition			$ 93,384
Number of branch locations \| Office			11
Other liabilities			$ 2,922
Goodwill			39,970
Loans			479,877
Investment securities			39,770
Deposits			$ (568,161)
Revenue earned												16,300
Direct expenses												$ 7,400
Increase (decrease) in other liabilities as a result of reclassification and adjustment								$ 1,300	40
Increase (decrease) in goodwill as a result of fair value adjustment									40
Decrease in loans								200
Decrease in other assets								1,700
Increased in accrued interest and fees receivable							$ 10		$ 10
Increase decrease in premises and equipment								$ 500
Kinderhook Bank Corp [Member] \| Upstate New York [Member]
Acquisitions [Abstract]
Number of counties where the bank has facilities \| country			5
Assets acquired			$ 642,800
Revenue earned			10,600
Direct expenses			4,700
Kinderhook Bank Corp [Member] \| Other Intangibles [Member]
Acquisitions [Abstract]
Intangibles			$ 0
Wealth Resources Network, Inc [Member]
Acquisitions [Abstract]
Cash				$ 1,200
Wealth Resources Network, Inc [Member] \| Customer Lists [Member]
Acquisitions [Abstract]
Intangibles				$ 1,200
HR Consultants (SA), LLC [Member]
Acquisitions [Abstract]
Cash					$ 300
HR Consultants (SA), LLC [Member] \| Customer Lists [Member]
Acquisitions [Abstract]
Intangibles					$ 300
Penna & Associates Agency, Inc. [Member]
Acquisitions [Abstract]
Cash						$ 800
Goodwill						300
Penna & Associates Agency, Inc. [Member] \| Customer Lists [Member]
Acquisitions [Abstract]
Intangibles						300
Styles Bridges Associates [Member]
Acquisitions [Abstract]
Cash						700
Styles Bridges Associates [Member] \| Customer Lists [Member]
Acquisitions [Abstract]
Intangibles						$ 700
Gordon B. Roberts Agency, Inc [Member]
Acquisitions [Abstract]
Increase (decrease) in goodwill as a result of fair value adjustment										$ 1,100
NRS [Member]
Acquisitions [Abstract]
Increase (decrease) in other liabilities as a result of reclassification and adjustment											$ (300)
Increase (decrease) in goodwill as a result of fair value adjustment											$ (300)