Regulatory Matters Other Regulation Disclosures (Details) (USD $)	Dec. 31, 2014
Banking and Thrift [Abstract]
Maximum Subsidiary Dividend	$ 29,200arow_MaximumSubsidiaryDividend

Number represents the maximum amount that could have been paid by subsidiary banks to Arrow (parent company) without prior regulatory approval.

No definition available.

Name:	arow_MaximumSubsidiaryDividend
Namespace Prefix:	arow_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant