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Guarantees (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Guarantor Obligations [Line Items] |  |
Commitments to Extend Credit, Nominal Amount | $ 321,143 | $ 315,256
Standby Letters of Credit, Nominal Amount | 4,466 | 3,526
Commitments to Extend Credit, Fair Value | 0 | 0
Fair Value Disclosure, Letters of Credit Outstanding, Amount | $ 12 | $ 23
Minimum |  |
Guarantor Obligations [Line Items] |  |
Letter of credit, fee percentage | 1.00% |
Maximum |  |
Guarantor Obligations [Line Items] |  |
Letter of credit, fee percentage | 3.00% |

X
- Definition The fair value of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | arow_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Reflects the fair value of loans and leases for which agreements to acquire or dispose exist. + References No definition available. + Details
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- Definition Letter of Credit, Fee Percentage + References No definition available. + Details
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Namespace Prefix: | arow_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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Period Type: | instant

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- Definition Reflects the carrying amount of loans and leases for which agreements to acquire or dispose exist. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108315417&loc=d3e61044-112788 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108315417&loc=d3e61082-112788 + Details
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Balance Type: | credit
Period Type: | duration

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