This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e1043-128460

Name:	us-gaap_BusinessCombinationAcquisitionRelatedCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

ACQUISITIONS - Intangible Asset, Goodwill and Acquisition-related Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Summary of loans acquired [Abstract]
Merger and acquisition integration related (recoveries) expenses	$ 4	$ 3,372	$ 31	$ 3,741
Steuben Trust Corporation [Member] \| Other intangibles [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Intangible asset useful life (amortization period)			8 years
NuVantage Insurance Corporation [Member] \| Core deposit intangibles [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Intangible asset useful life (amortization period)			8 years