QUARTERLY FINANCIAL DATA (UNAUDITED) (Parentheticals) (Details 1) - USD ($) $ in Millions	3 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Allowance for loan and specific reserves charge-offs	$ 8.0
Restructuring costs	8.0
Write down deferred tax assets	$ 7.6
CNB and FNBNY
Costs associated with acquisition		$ 0.7	$ 0.3

Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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