XML 46 R35.htm IDEA: XBRL DOCUMENT v3.24.3

Note 5 - Fair Value Measurements - Fair Value Quantitative Information (Details) - Fair Value, Nonrecurring [Member] $ in Thousands	Sep. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Collateral dependent loans, fair value	$ 404	$ 105
Fair Value, Inputs, Level 3 [Member]
Collateral dependent loans, fair value	404	105
Impaired Loan [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member]
Collateral dependent loans, fair value	$ 404	$ 105
Impaired Loan [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Minimum [Member] | Measurement Input Valuation Adjustments [Member]
Collateral dependent loans	0	0
Impaired Loan [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Maximum [Member]
Collateral dependent loans	0.25
Impaired Loan [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Maximum [Member] | Measurement Input Valuation Adjustments [Member]
Collateral dependent loans		0.15

X

- Definition

The measurement input of loans held-for-investment.

+ References

No definition available.

+ Details

Name:	atlo_LoanHeldforinvestmentMeasurementInput
Namespace Prefix:	atlo_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-10

+ Details

Name:	us-gaap_LoansReceivableFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
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_FairValueByAssetClassAxis=atlo_ImpairedLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ValuationTechniqueAxis=us-gaap_MarketApproachValuationTechniqueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MeasurementInputTypeAxis=atlo_MeasurementInputValuationAdjustmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: