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Consolidated Statements of Income Consolidated Statements of Income (Parenthetical)	Sep. 27, 2018
Income Statement [Abstract]
Stock dividend, percent	3.00%

X

- Definition

Stock Dividend, Percent

+ References

No definition available.

+ Details

Name:	arow_StockDividendPercent
Namespace Prefix:	arow_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_IncomeStatementAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration