XML 53 R43.htm IDEA: XBRL DOCUMENT
v3.23.3

Fair Value Recurring (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Measurements, Recurring [Member] |  |
Fair Value Disclosure, Securities Available-for-Sale [Abstract] |  |
Fair Value Disclosure, Agency Obligations | $ 122,750 | $ 125,617
Fair Value Disclosure, Agency RMBS | 192,457 | 218,160
Fair Value Disclosure, State and Political Subdivisions | 58,079 | 61,527
Fair Value Disclosure, Securities Available-for-Sale, Total | 373,286 | 405,304
Other Assets, Fair Value Disclosure | 373,286 | 405,304
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair Value Disclosure, Securities Available-for-Sale [Abstract] |  |
Fair Value Disclosure, Agency Obligations | 0 | 0
Fair Value Disclosure, Agency RMBS | 0 | 0
Fair Value Disclosure, State and Political Subdivisions | 0 | 0
Fair Value Disclosure, Securities Available-for-Sale, Total | 0 | 0
Other Assets, Fair Value Disclosure | 0 | 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value Disclosure, Securities Available-for-Sale [Abstract] |  |
Fair Value Disclosure, Agency Obligations | 122,750 | 125,617
Fair Value Disclosure, Agency RMBS | 192,457 | 218,160
Fair Value Disclosure, State and Political Subdivisions | 58,079 | 61,527
Fair Value Disclosure, Securities Available-for-Sale, Total | 373,286 | 405,304
Other Assets, Fair Value Disclosure | 373,286 | 405,304
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value Disclosure, Securities Available-for-Sale [Abstract] |  |
Fair Value Disclosure, Agency Obligations | 0 | 0
Fair Value Disclosure, Agency RMBS | 0 | 0
Fair Value Disclosure, State and Political Subdivisions | 0 | 0
Fair Value Disclosure, Securities Available-for-Sale, Total | 0 | 0
Other Assets, Fair Value Disclosure | 0 | 0
Fair Value, Measurements, Nonrecurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Abstract] |  |
Impaired Loans, Fair Value Disclosure | 963 | 2,054
Other Assets Fair Value Nonrecurring | 1,011 | 1,151
Assets, Fair Value Disclosure, Nonrecurring | 1,974 | 3,205
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Abstract] |  |
Impaired Loans, Fair Value Disclosure | 0 | 0
Other Assets Fair Value Nonrecurring | 0 | 0
Assets, Fair Value Disclosure, Nonrecurring | 0 | 0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Abstract] |  |
Impaired Loans, Fair Value Disclosure | 0 | 0
Other Assets Fair Value Nonrecurring | 0 | 0
Assets, Fair Value Disclosure, Nonrecurring | 0 | 0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Abstract] |  |
Impaired Loans, Fair Value Disclosure | 963 | 2,054
Other Assets Fair Value Nonrecurring | 1,011 | 1,151
Assets, Fair Value Disclosure, Nonrecurring | $ 1,974 | $ 3,205

X
- References No definition available. + Details
Name: | aubn_AssetsFairValueDisclosureNonrecurring3
Namespace Prefix: | aubn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | aubn_FairValueAssetsAndLiabilitiesMeasuredOnNonrecurringBasisAbstract
Namespace Prefix: | aubn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | aubn_FairValueDisclosureAgencyObligations
Namespace Prefix: | aubn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | aubn_FairValueDisclosureAgencyRmbs
Namespace Prefix: | aubn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | aubn_FairValueDisclosureSecuritiesAvailableForSaleAbstract
Namespace Prefix: | aubn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | aubn_FairValueDisclosureSecuritiesAvailableForSaleTotal
Namespace Prefix: | aubn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | aubn_FairValueDisclosureStateAndPoliticalSubdivisions
Namespace Prefix: | aubn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | aubn_ImpairedLoansFairValueDisclosure
Namespace Prefix: | aubn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | aubn_OtherAssetsFairValueNonrecurring
Namespace Prefix: | aubn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value portion of other assets. + References No definition available. + Details
Name: | us-gaap_OtherAssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |